Iciaiu/dealer - American Radio History

Transcript

MAY 1975 75 CENTS iges6 ICIAIu/DEALER ST TV-RADIO SERVICE & SALES CIRCULATION FACTS ABOUT TESTING FETS Medical Electronics Panasonic's '75 Color Chassis All zCo o About Scope Specs Showroom MATV HOME OFFICE -INDIANA: 5233 S. HWY. 37 BLOOMINGTON, IND. 47401 TEL. 812, 824-9331 ALABAMA: 524 32ND STREET SOUTH BIRMINGHAM, ALA. 35222 TEL 205, 323-2657 ARIZONA: 2412 W. INDIAN SCHOOL RD. PHOENIX, ARZ. 85061 TEL. 602, 2793718 PT! ELEC CALIFORNIA -NORTH: 4611 AUBURN BLVD. SACRAMENTO, CALIF. 95841 TEL. 916, proud to announce the 482-6220 CALIFORNIA -SOUTH: 5111 UNIVERSITY AVE. SAN DIEGO, CALIF. TEL. 714, 280.7070 GRAND OPENING 92105 COLORADO: new Service Centers 4958 ALLISON ST. ARVADA, COLO. 80001 TEL. 303, 4231080 FLORIDA -NORTH: 1918 BLANDING BLVD. JACKSONVILLE, FLA. 32210 TEL. 904, 389-9952 FLORIDA -SOUTH: 12934 N.W. 7th AVE. MIAMI, FLA. 33168 TEL. 305, 685.9811 AbaM INDIANA: 5233 S. HWY. 37 BLOOMINGTON, IND. 47401 TEL. 812, 824.9331 KANSAS: 3116 MERRIAM LNE. 66100 KANSAS CITY, KANSAS TEL. 913, 831-1222 LOUISIANA: 2914 WYTCHWOOD DR. METAIRIE, LOUISIANA 70033 TEL. 504, 885.2349 MARYLAND: 1105 SPRING ST. SILVER SPRING, MD. 20910 44)(Jbl TEL. 301, 565.0025 MASSACHUSETTS: 191 CHESTNUT ST. SPRINGFIELD, MASS. 01103 TEL. 413, 734-2737 MICHIGAN: 13709 WEST 8 MILE DETROIT, MI. 48235 TEL. 313, 862.1783 RD. MINNESOTA: 815 WEST LAKE ST. MINNEAPOLIS, MINN. 55406 TEL. 612, 824-2333 MISSOURI: 8456 PAGE BLVD. $1Oas flO1l)JOII too... ST. LOUIS, MO. 63130 TEL. 314, 428.1299 NEW YORK: 993 SYCAMORE ST. BUFFALO, N.Y. 14212 TEL. 716, 891-4935 N.Y. CITY -NEW JERSEY: 158 MARKET ST. E. PATERSON, N.J. 07407 TEL 201, 791-6380 CAROLINA: 724 SIEGLE AVE. NORTH CHARLOTTE, N.C. 28205 TEL. 704, 332-8007 OHIO -NORTH: 5682 STATE RD. CLEVELAND, OHIO 44134 TEL. 216, 845-4480 OHIO -SOUTH: 8180 VINE STREET CINCINNATI, OHIO 45215 TEL. 513, 821.2298 OKLAHOMA: 3007 N. MAY OKLAHOMA CITY, OKLA. 73106 TEL. 405, 947-2013 OREGON: 5220 N.E. SANDY BLVD. PORTLAND, OREGON 97213 TEL. 503, 282-9636 PENNSYLVANIA -EAST: 1742-44 STATE RD. UPPER DARBY, PA. 19082 TEL. 215, 352-6609 PENNSYLVANIA -WEST: 257 RIVERVIEW AVE. W. PITTSBURGH, PA. 15202 TEL. 412, 761-7648 ...gym% ,8h, Service! 1 ALL PTS BRANCHES are wholly owned subsidiaries of PTS ELECTRONICS, INC: (NO FRANCHISES!) and report directly to the Home Office in Bloomington, Indiana. Only this way can we guarantee the same quality-PRECISION TUNER SERVICE -that made PTS the leader in this field. PTS is proud to be the only tuner service to publish a TUNER REPLACEMENT PARTS CATALOG. (New 4th Edition; over 100 pages of tuner blow-ups. Tuner -antenna coil -and shaft replacement guides available for $2.00.) WE OFFER MORE. SERVICE IS EVERYTHING WITH US. Color Black & White Transistor Tubes Varactor Detent UHF All Makes WE ARE DYNAMIC AND FAST. TRUSTWORTHY. YOU AND US -A TRUE VHF, UHF UV-COMBO PARTNERSHIP. IF -SUBCHASSIS TENNESSEE: 3614 LAMAR AVE. MEMPHIS, TN. 38118 TEL. 901, 365-1918 TEXAS -NORTH: MOPAC LANE LONGVIEW, TEX. 75601 TEL. 214, 753.4334 TEXAS -EAST: 4324-26 TELEPHONE RD. HOUSTON, TEX. 77032 TEL. 713, 644-6793 VIRGINIA: 3118 E. PRINCESS ANNE RD. NORFOLK, VA. 23504 TEL. 804, 625.2030 WASHINGTON: 432 YALE AVE NORTH SEATTLE, WASH. 98101 TEL 206, 623.2320 WISCONSIN: 3509 W NATIONAL MILWAUKEE, WI. 53215 TEL. 414, 6433800 YEAR GUARANTEE ELECTRONICS, INC. is recommended by more TV manufacturers and overhauls more tuners than all other tuner services combined! PTJ-nume INOT A FRANCHISE COMPANY ...for more details circle 121 on Reader Service Card $10.95 17.95 12.50 Major parts and shipping charged at cost. (Dealer net!) over 4000 exact tuner replacements available for $14.95 up (new or rebuilt) (3iJ AND STILL TRYING HARDER! We hope you've been keeping tabs on us. Thanks to Say -a-Tab, you really ripped us off last year. Thousands of dealers and service technicians ripped tabs off Sylvania receiving tube boxes and received thousands of valuable awards. And we like it! That's why we're coming back with Sylvania Say -a -Tab '75-bigger and better than ever before! All you have to do is save the tab marked "WALTHAM" found on every Sylvania receiving tube box. By saving these tabs from now until November 30, 1975, you can redeem them for great awards. And you don't need a million of 'em to earn a prize. Visit your local authorized Sylvania Distributor and pick up your free Sylvania Say-a -Tab '75 Award Catalog, special Tab Saver Envelope, and Award Order Form with complete instructions. Or fill in the handy order form below. Say-a -Tab '75! It's a great way to save all around. Save time by stocking one line of tubes-Sylvania. Save money on unnecessary callbacks thanks to Sylvania quality. And save on great merchandise awards with Sylvania Say -a -Tab '75! Introducing... i_ i_ i_ i_ i_ i_ _ i_ i_ i_ i_ _ i_ i_ _ i_ errj SYLVANIA Say -a -Tab '75 , i MAIL THIS CARD TO: SYLVANIA AWARD HEADQUARTERS P.O. Box 1000, Fenton, Missouri 63026 1 1 NAME COMPANY 1 ADDRESS 1 CITY 1 1 1 ZIP STATE .r-- The Sylvania Say -a -Tab Program is available only to dealers and Sy%NI Kee WAZNAM, NJpSS. 02\54 service technicians. Employees of General Telephone & Electronics. GTE Sylvania. their subsidiaries, affiliates, authorized franchised distributors, or their advertising agency are not eligible to participate. ET -1964 1 1 I 1 1 When you replace with ASTATIC phono cartridges & needles your profits are at a peak. Only Astatic, the world's most complete line, gives you one -source supply for EVERY need, factory original fit and performance EVERY time, maximum profit EVERY time through absence of customer complaints anc call backs. Impo-ts and cheap substitutes cost you more than meets the eye! Much more. THE ASTATIC CORPORATION / Conneaut, Ohio 44030 U. S. A. Astatic Ltd., Scarborough, Metro Toronto, Ontario Export Sales: Morhan Exporting Corp., 270 Newtown Rd., Plainview, New York 11803, In Canada: Canadian ASTATIC U. S. A. - The Biggest Name In Phono Cartridges, Needles, Microphones ...for more details circle /03 on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER 3 Look for the PTC Semiconductor Mart at your Mallory Distributor's. PTC SEMICONDUCTOR MART THE FAMOUS MALLOBIN' WAREHOUSE. With the semiconductors most needed by service technicians. THE SEMICONDUCTOR MART. Here's the quick, easy way to get the replacements you need. It's the best assortment of the hottest semiconductors around. Transistors, diodes, multiple diode packages, zener diodes and integrated circuits included. FREE copies of the very latest cross-referenced Semiconductor Product Guide. Clear, concise product data on the packages makes your choice easy. And Mallory quality, versatility, and dependability make every choice a good one. You know what you need. Now you know where to find it. MALLORY Batteries MALLORY DISTRIBUTOR PRODUCTS COMPANY a division of P. R. MALLORY & CO. INC. Box 1284. Indianapolis. Indiana 46206: Telephone: 317-866-3731 Capacitors Controls Security Products 4 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 DURATAPE" Resistors Semiconductors MALLOBIN' is a registered trademark of P R Mallory & ...for more details circle 117 on Reader Service Card SONALERV Co Inc. Switches Timing Devices and Motors ELECTRONIC TECHNICIAN/DEALER May 1975 J.W. PHIPPS Editor 1 East First Street VOLUME 97 NUMBER 5 THE COVER: Because some characteristics of field - effect transistors (FETs) make traditional ohmmeter testing inconclusive, in - circuit dynamic testing, symbolized on this issue's cover, is usually the best approach to FET testing, particularly MOSFETS. Duluth, Minn. 55802 (218) 727-8511 ALFRED A. MENEGUS Publisher 757 Third Avenue New York, N.Y. 10017 (212) 754-4382 FEATURES 13 FACTS ABOUT TESTING FETS Differences in the composition and operating principles of field - effect and conventional bipolar transistors make most bipolar static testing techniques insuitable for FET testing. By Bernard B. Daien, ET/D Contributing Editor. TOM GRENEY Publishing Director 18 JOSEPH ZAUNAR Managing Editor Production Manager JOHN PASZAK 24 Manager, Reader Services color TV buyers who are more knowledgeable about and more demanding of good picture quality make good showroom MATV systems more important today than ever before. By J.W. Phipps. 28 NEW IN COLOR TV FOR 1975 - Part 9 With coverage of the new and significantly changed features and circuits in Panasonic's 1975 color TV line, ET/D completes its coverage of current - model color TV receivers and begins preparing coverage of the 1976 color TV line to be introduced in June at the Consumer Electronics Show in Chicago. By Joseph Zauhar, ET/D Managing Editor. LOIS SANDERS Promotion Director ROZ MARKHOUSE Classified Advertising Manager SHOWROOM MATV A new generation of LILLIE PEARSON Circulation Fulfillment GENE BAILEY -A HEALTHY NEW Similarities in the electronic technologies employed in home entertainment and medical electronic products plus the relative high cost and dramatically increasing use of electronics in medical applications make the servicing of medical electronic equipment a natural alternative for competent consumer electronic technicians. By Joseph J. Carr, ET/D Contributing Editor. BERNICE GEISERT Graphic Design MEDICAL ELECTRONICS FIELD FOR SERVICERS 32 TECH BOOK DIGEST- UNDERSTANDING SCOPE SPECS - Part 2 Completion of a two - part series that should help you select a scope which meets your needs. (Part 1 appeared in the March 1975 issue of ET/D.) By Clayton Hallmark, TAB BOOKS, Copyright 1973. CONTRIBUTING EDITORS JOSEPH J. CARR BERNARD B. DAIEN TEKFAX - Admiral b-w TV Ch. T5R3; Airline color TV Model GAI -12915A; TRAV-LER color MANAGERS TV Ch. T41K10-4A/B; Zenith b -w TV Ch. 19FB14; and Zenith color TV Ch. 19FC45Z. DAVE HAGELIN 43 East Ohio Street Chicago, III. 60611 DEPARTMENTS (312) 467-0670 CHUCK CUMMINGS Ad Space South/West 613 North O'Connor Irving, Texas 75060 (214) 253-8678 6 TECHNICAL LITERATURE 43 NEW PRODUCTS 9 NEWS OF THE INDUSTRY 49 DEALER SHOWCASE 12 ELECTRONIC ASSOCIATION DIGEST 50 CLASSIFIED ADS 40 TEST INSTRUMENT REPORT 52 ADVERTISERS' INDEX 42 TECH DIGEST 55 READER SERVICE KEN JORDAN DONALD D. HOUSTON 1901 West 8th Street Los Angeles, Calif. 90057 (213) 483-8530 CHARLES S. HARRISON CY JOBSON 57 Post Street San Francisco, Calif. 94104 (415) 392-6794 ROBERT UPTON Tokyo, Japan C.P.O., Box 1717 A HARCOURT BRACE JOVANOVICH PUBLICATION ABP ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications. Corporate offices: 757 Third Avenue, New York, New York 10017. Advertising offices: 43 East Ohio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial, Accounting, Advertising Production and Circulation offices: 1 East First Street, Duluth, Minnesota 55802. Subscription rate: one year, $7; two years, $12; three years, $16 in the United States and Canada. Other countries: one year, $15; two years, $24; three years, $30. Single copies: 75e in the U.S. and Canada; all other countries: $2. Second Class postage paid at Duluth, Minnesota 55806 and at additional mailing offices. Copyright U 1975 by Harcourt Brace Jovanovich, Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. POSTMASTER: Send Form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth, Minne- sota 55806. MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 5 TECHNICAL LITERATURE as a separate section highlighting 14 major new additions to the Pomona line. Special products covered in the new catalog include IC test clips, at- Electronics, 1500 East Ninth St. miniature and standard binding posts with wire - wrap terminal, molded banana plugs and accessories, BNC, TCN, Type N and UHF adapters; coaxial test accessories and adapters, panel receptables jacks, plugs and patch cords, test clips and shielded black boxes. The catalog has photographs, specifications and a quantity price discount schedule. ITT Pomona A new guide to microwave ovens, both commercial and consumer types, is now available. It lists brand name, manufacturer and model number of most microwave ovens sold in the tenuators, bulkhead receptacles, TEST ACCESSORIES A new 68 - page catalog listing test accessories designated for manufac- turers and laboratories engaged in testing or designing the electronic equipment is available at this time. Included are a table of contents and an alphabetical - numerical index as well - Pomona, Ca. 91766. MAGNETRON TUBES United States within the last ten years. With each model number is the type number of the Amperex magnetron which is a direct, interchangeable equivalent. The guide also includes a condensed catalog of Amperex magnetrons currently offered as replacements to the service industry through authorized Amperex tube distributors. Amperex Electronic Corp., 230 Duffy Avenue, Hicksville, NY 11802. Retrieve Fading Color. And Save Money, Too SPECIAL-PURPOSE CRT'S A catalog providing information on Flying Spot Scanner Cathode Ray Tubes (CRT's) for video signal generators and Photorecording CRT's for photographic applications is now available. This brochure, STC - 905, describes the use of these special - purpose cathode - ray tubes, classifies the various tubes by size and tabulates many of the parameters for preliminary selection. For a copy, contact your RCA Sales Representative or write Building 100, RCA, New Holland Ave., Lancaster. PA. 17604. with Perma Power Color-Brite ELECTRONIC PARTS AND EQUIPMENT A wholesale catalog that contains one of the most complete listing of audio, electronic parts, test equipment and accessories is now available. It also lists surplus equipment and parts, such as transistors, resistors, filters, yokes, etc. Qualitone Industries, Inc., 17 Columbus Ave., Tuckahoe, NY. 10707. Save $4.65 when you buy a four -pack of Model C-511 Color-Brites. And get a magnetic telescoping TEST INSTRUMENTS A new catalog describing a complete line of Heath/Schlumberger assembled high performance instruments is now available. Featured in this latest catalog is a new precision single - trace oscilloscope Model SO -4530. Other instruments featured in the catalog are oscilloscopes, VOMs and VTMs, power supplies, generators and strip chart recorders. Heath Company, Benton Harbor, MI. 49022. retriever free! Ever dropped a nut or screw and had it bounce away from you, out of reach? With this magnetic telescoping retriever, it's easy pickings! The 5" long retriever clips to your pocket, so it's handy whenever you need to retrieve a part as far as 19 inches away. It's just as easy to retrieve sharpness, contrast and fading color! Install a Perma Power Color -Brite . .. for immediate TV picture improvement and certain customer satisfaction. Model C-511 is the one you need for the prevalent rectangular picture tubes. These Color Brites usually sell for $6.15 each, but for a limited time you can get a four-pack for just $19.95. That's a $4.65 savings, and the retriever is our gift. But supplies are limited, so see your distributor today. tt PErma POWER SOLDERING EQUIPMENT Chamberlain Manufacturing Corporation Perma Power Division 5740 North Tripp Avenue, Chicago, Illinois 60646 Telephone (312) 539-7171 ...for more details circle 122 on Reader Service Card 6 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 A A new 24 - page general catalog which describes their complete line of soldering equipment is now available. The catalog includes the following: Soldering Irons, Soldering Iron Hold- enes Fix it with SK. The RCA quality replacement. Count on top quality in SK replacement semiconductors. Because they carry the name RCA, a top manufacturer of OEM devices. Same strict AQL standards, same strict Director of Quality Assurance. That's how we protect you from callbacks, so you can make more profitable use of your time. RCA's higher-than -ever 410 to 1 replacement ratio will help you save time too. Your key to fast, easy replacement is RCA's new 1975 SK Replacement Guide. Get your copy at the RCA distributor where you buy SK SK3004 Silken Zeiler Diode parts.`unimumeamme MIT CONDITIONB (DEVICE W99 PP t W í1.5V RCA Solid State, Box 3200, Somerville, N.J. 08876. gyCDMRNTIT=OEjA CNAz1ACTENI$TK:S 22'q! AKDowNNAPEbuIGl111P Iz.Q fmA Mee InAMP 00-21 Pacxape i It's OK if it's sk ...for more details circle 125 on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 7 >rnJ AUTOMATIC STAPLE GUNS CUT WIRE & CABLE INSTALLATION COSTS . . . without cutting into insulation! SAFE! Grooved Guide positions wire for proper staple envelopment! Grooved Driving Blade stops staple at right depth of penetration to prevent cutting into wire or cable insulation! T-18-Fits wires up to-), 3/16" in diameter. No. BELL, TELEPHONE, THERMOSTAT, INTERCOM, BURGLAR ALARM and other low i1 voltage wiring. .4 Uses T-18 staples with 3/16" round crown in 3/8" and 7/16" leg lengths. No. T-25-Fits wires up to 1/4" in Uses T-25 staples with 1/4" round crown in 9/32 9/16" leg lengths 2) '\ NEW! Intermediate No. T-37 -Fits wires and cables up to 5/1 6" in diameter. Same basic construction as Nos. T-18 & T-25. Also used for CATV and DRIVE RINGS in stringing wires. Uses T-37 staples with 5/16" round crown in 3/8", 1/2" and 9/16" leg lengths. No. T-75-Fits wires and cables up to 1/2" in diameter. RADIANT HEAT CABLE, OF CABLE, WIRE CONDUIT COPPER TUBING or any non-metafic sheathed cable. Also used as ( DRIVE RINGS in stringing wires. Uses T-75 staples with 1/2" flat crown in 9/16", 5/8" and 7/8" leg lengths. munications equipment is now available. The brochure covers the latest Motorola offerings in mobile communications featuring fuel and cost saving mobile radios, car telephones and data communications equipment. Motorola Communications and Electronics, Inc., 1301 E. Algonquin Road, Room 4420. Schaumburg, IL. 60172. COLOR - TV SERVICE HANDBOOK The fifth volume of RCA's popular Color - TV Service Handbook is now available. This compact 276 - page handbook provides the specific service data needed for routing service ad- Magnavox, Olympic, Panasonic, Packard Bell, Philco, RCA, Sony, Sylvania and Zenith. The easy - to - use handbook contains a Chassis Index to guide the user to the proper sections of the handbook. Included information on chassis layouts, leakage current hot and cold checks, RCA receiving and picture tube replacements, SK series semiconductor replacements and the following adjustment procedures: purity, convergence, AGC, horizontal hold, color killer, pin cushion, black and white set - up, color AFPC (field), high voltage and a variety of miscellaneous adjustments. Price $3.75 each. RCA Electronic Components, 415 South Fifth Street, Harrison, NJ. 07029. WOO Street, Saddle Brook, N. J. Corp., 105 Maxess Road, Melville, NY. 11746. EXACT REPLACEMENT TV PARTS A nation wide comprehensive program to make the purchase and use of Thordarson Meissner exact replacement TV parts more profitable and practical is now available. The program will entail a mailing of their new comprehensive pocket TV replacement guide which lists more than 30,000 original equipment part numbers along with the T -M replacement number. Comments concerning their products and replacement information along with suggestions on new replacement items that are needed in the industry are welcomed. Thordarson Meissner Inc., Electronic Center, Mt. Carmell, IL. 62863. TECHNICAL BOOKS A fully illustrated, 44 - page catalog featuring full color covers, describing the firm's unique Electronic Book/ Kits is now available. Tab Books, Blue Ridge Summit, PA. 17214. od e l 500K 12 -piece desoldering kit $21.55 NET TEST INSTRUMENTS A new 6 - page condensed catalog listing a complete line of electronic test and measuring instruments for industry, laboratories, schools and radio - TV servicing is now available. Among the equipment listed are oscilloscopes, VTVM's, VOM's, generators, tube/transistor testers, power supplies and probes, available in wired or kit form. Eico Electronic Instrument Co., Inc., 283 Malta Street, Brooklyn, NY. Soldering kits Desoldering kits Soldering-Desoldering kits Everything needed to solder or desolder, or both. Featuring new Endeco soldering and desoldering irons with safety light . the irons professionals really appreciate. Tips, stand, desoldering head and cleaning tool included, as required, all in a metal box with hasp. $21.55 to $39.65. See your distributor or write 07663 INDIANAPOLIS, INDIANA 46220 PHONE 317/251-1231 ...for more details circle 102 on Reader Service Card 8 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 page Export Price List containing more than 2,000 receiving A 12 . 5127 EAST 65TH ST. 11207. RECEIVING TUBES 271 tube types is now available. The list is said to contain the most complete range of American, European and Japanese consumer and industrial receiving tubes available anywhere. Many classic and antique are also listed. International Components A 16 - page, full - line brochure enti- tled "Vehicular Communications" listing everything in mobile com- bleshooting on 1973 and 1974 models of the following 16 set manufacturers: Admiral, Motorola, Airline, Dumont, Emerson, General Electric, Hitachi, Also used for RADIANT HEAT WIRE and MOBILE COMMUNICATIONS justments and preliminary trou- diameter. Same basic construction and fastens same wires as No. T-18. .3/8", 7/16" ers, Soldering Tool and Accessory Kits, Soldering Iron Tips, Soldering Aids, Solder Pots. It describes each product in detail. Precision Electric Co., Inc., 49 Sullivan Street, Westwood, NJ. 07675. eiieCO - ...for more details circle enterprise development corporation 111 on Reader Service Card NEWS OF THE INDUSTRY Service Technician New Chief Of California Bureau of Repair Services William J. Hayes, electronic service technician and former owner of three TV/appliance sales and service firms in the Sacramento area, recently was sworn in as the new chief of California's Bureau of Repair Services, the state agency which registers and regulates TV service businesses in California. Hayes, who has been assistant chief of the Bureau since 1966, was first employed by the Bureau in 1965 as a field investigator. Majority Of Color TV Sold In 1974 Were All - Solid - State Portable or Table Models Portables and table models represented 67.7 percent of the color TV receivers sold last year, and, for the first time, the majority of sets sold were in the 21- inch - or - smaller category, according to the 1975 Consumer Electronics Annual Review, a book compiled and published each year by the Consumer Electronics Group of the Electronic Industries Association (EIA). These and a variety of other statistics about the consumer electronic market are included in the 44 page book, which is available for 50 cents from the EIA, 2001 Eye St., N.W., Washington, D.C. 20006. Over 70 Percent of TV Households Have Color About 48.5 million homes, or 70.8 percent of all TV households, had color TV as of January 1 of this year, according to estimates by NBC Research. There were 57 million color and 64 million monochrome TV receivers in use on January 1, says NBC. RCA Service Company Maintains Over One TV And Appliance Service Contracts Million The RCA Service Company in 1974 was able to maintain a total of over one million service contracts for home TV and appliances, according to RCA's 1974 Annual Report. The report states that revenue received by RCA's Consumer Services operations, of which RCA Service Company is a part, increased for the 20th consecutive year, although earnings declined. TV servicing, says the report, was the biggest source of revenue for the Consumer Services Divison of RCA. Zenith Reveals Advanced Technology In Annual Report A new thin - panel TV display device, a surface wave integrated filter for color TV IF sections, and microcircuit programmed TV electronic channel selector display devices are three color TV related areas of electronic technology in which Zenith made significant progress during 1974, according to Zenith Radio Corporation's Annual Report for 1974. The miniature surface wave integrated filter, the complete package of which is as small as a dime, combines "solid - state and acoustic wave principles" in a unique microcircuit that replaces 12 separate parts in the IF section of a color TV and eliminates the need for IF alignment during the life of the receiver. Microcircuits for use in TV electronic tuning systems, including programmed channel selectors and displays, are under development or in pilot production at Zenith's Microcircuit Facility. The report states that Zenith intends to extend all - electronic tuning to its entire TV line. During 1974, says the report, Zenith researchers made significant progress in the development of a practical, gas discharge, thin - panel TV display device MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 9 NEWS... which may eventually replace today's form of TV picture tube. According to the report, since the demonstration of an early version of the device at a technical conference not long ago, substantial advances have been made in brightness, efficiency and color. Says the report, "the concept of thin - panel, mural television has, therefore, moved a step closer to commercial reality." CB Radio Continues To Boom Applications received by the Federal Communications Commission (FCC) for Class D Citizens Band (CB) Radio Licenses during January reached an all - time monthly high of 72,658, up 124 percent over the 32,459 applications received in January 1974. This is the largest annual percentage increase since the Citizens Band Radio Service was instituted by the FCC, although annual increases since 1972 have been significant, with applications in 1974 exceeding those in 1973 by 95 percent, and those in 1973 exceeding applications in 1972 by 34 percent. As a result of continuous, substantial increases in CB license applications during the past four years, the total number of licenses in effect as of January 1975 exceeded 1 million. It is anticipated that the number of CB radio license applications received during this past March will exceed the record set in January because in March the license fee was reduced from $20 to $4. Projections by the Citizens Radio Section, Communications Divison, Electronic Industries Association (EIA), indicate that 1 out of 28 of all American families and 1 out of 15 farm families now use Citizens Band two - way radio. More than 6,250,000 of these sets are in use, with installations in 1 out of 33 vehicles on the road. This includes: 1 out of 39 passenger cars 1 out of 5 long - haul trucks 1 out of 7 recreational vehicles 3 out of 7 four - wheel drive vehicles CB Two - Way Radio is also used on 1 out of 7 pleasure boats. Over $1.5 billion has been invested in Citizens Band radio equipment currently in use by the American public, according to the EIA. PTS Opens New Tuner Repair Facilities In Arizona and Wisconsin PTS Electronics, Inc., Indiana - based TV tuner repair firm, has opened a new service center in Phoenix, Arizona (2412 W. Indiana School Road, 85015) and in Milwaukee, Wisconsin (3509 W. National, 53215). All 1976 GE Color TV To Have 90 - Day Labor Warranty - - General Electric's entire 1976 TV line both black - and - white and color will have 90 - day labor warranties. This announcement was made by Fred R. Wellner, general manager of GE's TV receiver Products Department, during the recent introduction of the first GE 1975 all - solid - state color TV to carry a 90 - day labor warranty. Monochrome TV receivers in GE's 1976 line, to be introduced in June, will have a 90 - day parts and labor warranty and a one - year picture tube warranty. Color TV receivers in GE's 1976 line will have one - year parts, 90 - day labor and two - year picture tube warranties. The return to color TV 90 - day labor warranty was started by RCA early this year and since then has been picked up by six other major color TV manufacturers Admiral, GE, Magnavox, Quasar, Sylvania and Zenith all of whom have 90 - day labor warranties on at least one current - model - year color TV receiver. - 10 / ELECTRONIC TECHNICIAN/DEALER, - MAY 1975 Avoid serious problems when replacing film capacitors Use genuine Sprague Type PP and PM Capacitors in critical deflection circuits. The next time you replace a dipped tubular in one of the newer color TV sets, don't automatically assume you're replacing an ordinary every -day film or paper capacitor. If it happens to be a deflection capacitor used for commutation on hand for those critical situations where ordinary replacements could cause serious problems. SPRAGUE TYPE PM SPRAGU or S -shaping, you need a polypropylene or polycarbonate film replacement with (1) high a -c current -carrying capability; (2) close capacitance tolerance; (3) good capacitance stability. The standard replacement capacitors used in the industry, even our superior Type PS dipped tubulars, just won't do the they could cause the set to become inoperative again. job TYPE PP ... Play it safe . . dipped tubulars may look alike on the surface, but there can be a b_g difference in the film dielectric. Keep a supply of Sprague Type PP and PM capacitors . SPECIAL DEFLECTION CAPACITORS FOR COMMUTATING AND A Service Technician Introductory Super Special Cling DAAAAF DADP YMA6YF OlUIDIE DROP SMAFLF NOW Mr S -SHAPING .11111 the KF-28 ASSORTMENT ...a total list price value of $65.00... with a regular dealer net of $35.95... for a $2520 low, low dealer net ready for those critical application replacements in today's color TV sets with the KF-28 Assortment. It contains 41 Type PP and PM polypropylene and polycarbonate capacitors in 20 popular ratings, stocked in a handy cabinet that puts the film capacitors you need at your fingertips, neatly organized and easy to find. Measuring 934" wide x 5" high x 61/2" deep, this attractive blue 9 -drawer cabinet has clear plastic drawers with adjustable dividers. Pre labeled drawer fronts identify the capacitors inside. A raised area on top of the cabinet and a depression in the bottom facilitate stacking of two or more cabinets. ASSORTMENT KF-28 CONTENTS Be Get a KF-28 Assortment from your Sprague distributor today ! ¡IF Quan. 2 1.5 2 .01 2 .015 2 .033 2 .06 2 .081 2 .2 2 .0018 2 .0022 3 .0039 @ WVDC @ @ @ @ @ @ @ @ @ @ Cat. No. Quan. M,F @ WVDC Cat. No. 150 PM15-M1.5 2 .01 @ 600 PP6-S10S 400 PP4-S10 2 .066 @ 600 PP6-S66S 400 400 400 400 PP4-S15 2 .075 2 .022 600 800 PP6-S75S PP4-S33S PP4-S6OS 2 .047 800 PP8-S47S PP4-S81S 2 .051 PP4-P20 2 .0018 PP6-D18S 2 .002 PP6-D22S 2 PP6-D39S 2 .0033 .0039 800 1600 1600 1600 1600 PP8-S51S 400 600 600 600 @ @ @ @ @ @ @ @ PP8-S22S PP16-D18 PP16-D20 PP16-D33 PP16-D39 6,5108 For cross-reference information on close -tolerance polypropylene and polycarbonate film capacitors, showing original part numbers with correct Sprague replacements, ask your Sprague distributor for Cross Reference Guide C-873, or write to: Sprague Products Company, 65 Marshall Street, North Adams, Mass. 01247. THE BROAD -LINE PRODUCER OF ELECTRONIC PARTS SPRAGUE THE - MARK OF RELIABILITY ...tor more details circle 127 on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 11 zianzans 111111111111111111131111111111 ELECTRONIC ASSOCIATION DIGEST Information about the activities of national, state and local associations of electronic servicers, dealers and manufacturers. Material for publication in this department should be addressed to: Service Association Digest, ET/D, East First St., Duluth, Minn. 55802. 1 NESDA/ISCET Annual Convention August 13-17 Il lam Heath's new 4530 a professional TV service scope with a practical price It's hard to find a better TV service scope value than the new Heathkit 4530. Features like TV coupling, DC -10 MHz bandwidth, wide-band triggering capability, sensitive 10 mV/cm vertical input and calibrated X -channel input make it a versatile, easy -to -use scope every service technician will appreciate. Trigger circuits are digitally controlled, requiring only a level control and a slope switch. Various trigger signals can be selected: a sample of the vertical input signal, a sample of the line voltage or an externally applied trigger signal. In the TV trigger coupling mode, the 4530 can be easily triggered on the vertical or horizontal signal in a composite video signal such as the one shown above. Trigger bandwidths are guaranteed to 15 MHz, AC and DC coupled. A low-pass filter with 1 kHz cut-off is used in the TV coupling mode. High or low frequency waveforms are no problem since the 4530's wide range of time bases can be switched from 200 ms/cm to 200 ns/cm. And any sweep can be expanded five times. The 4530 is one of the few single trace scopes available with two input channels. For true X -Y operation, a calibrated X -input is provided with maximum sensitivity of 20 mV/cm. The 4530 is easy to operate, easy to service and offers a lot of performance per dollar. The 10-4530 is available in easy -to assemble kit form for only $299.95*. Or order the factory assembled and calibrated SO -4530, just $420.00*. Send for your free Heath catalogs The latest Heath/Schlumberger Assembled G t_ R1 =tee. Instruments Catalog features a complete line of high performance, low cost instruments for service and design applications. Our '75 Heathkit Catalog describes the world's largest selection of electronic kits including a full line of lab and service instruments. Send for your free copies to- - day. IBM HEATH HEATH COMPANY Dept. 24-05 Benton Harbor, Michigan 49022 Schlumberger Scheduled for Friday, August 15, are: Keynote Breakfast (8:00 AM); the Electronic Circus, an electronic serviceroriented trade show with technical seminars (9:00 AM-6:00 PM); and the annual meeting of ETANC (8:00 PM). Activities scheduled for Saturday, August 16, are: the NESDA annual officers election meeting (9:00 AM); the ETANC annual officers election meeting (9:00 AM); and the Awards Banquet and Dance (7:00 PM). On the final day of the convention, Sunday, August 17, a prayer breakfast will be held at 9:00 AM, and ISCET delegates and all other interested electronic technicians will meet at 1:00 PM. The registration fee for the convention is $40.00 per person and includes those meals which are sponsored by NESDA supporters, a cocktail party, entry to the Elec- tronics Circus and related technical seminars and the banquet and dance. Room rates at the Hyatt House reportedly range from $21.00 for singles to $27.00 for doubles. Additional information about the NEDA/ISCET convention can be obtained by writing to: NESDA, 1715 Expo Lane, Indianapolis, Indiana 46224; or phone NESDA at (317) 241-8160. Wisconsin Annual Convention May 30 -June 1 The Wisconsin Electronic Service Association (WESA) is holding its annual convention May 30 -June 1 at the Marriott Inn just off of Interstate 94 at 375 South Moorland Road in the Brookfield area near Milwaukee. The convention will open with a NESDA business management school from 9:00 AM to 5:30 PM on Friday, May 30. The school is sponsored by Taylor Electric, a Milwaukee Information about registration can be obtained by phoning WESA president John Stanczak, (414) 476-6514. Name Florida ESA Annual Convention June 20-22 State MAIL ORDER PRICES; F.O.B. FACTORY. PRICES A SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. Zip ...for more details circle 113 on Reader Service 12 (8:00 PM). RCA distributor. Please send the 1975 Heathkit Catalog. Please send the latest Heath/Schlumberger Assembled Instruments Catalog. Title Company/Institution Street City The annual joint convention of the National Electronic Service Dealers Association (NESDA) and the International Society of Certified Electronics Technicians (IS CET), the technician affiliate of NESDA,is being held August 13-17 at the Winston-Salem Hyatt House and Convention Center, Winston-Salem, North Carolina. The NESDA/ISCET convention will be hosted by the Electronic Technicians Association of North Carolina (ETANC), which will be holding its annual convention in conjunction with that of NESDA and ISCET. The convention will open with a golf tournament at 9:00 AM on Wednesday, August 13. (Registration for the golf tournament is $10.00.) Activities scheduled for Thursday, August 14, are: a ladies tour of attractions in the Winston-Salem area (10:00 AM; the NESDA Profitable Service Management School (9:00 AM -5:00 PM), the registration fee for which is $20.00 per person; and the NESDA executive committee meeting / ELECTRONIC TECHNICIAN/DEALER, MAY 1975, Card TE -316j The annual convention of the Florida Electronic Service Association (FESA) will be held at the Don Ce Sar Resort Hotel, St. Petersburg Beach, Florida, June 20-22. The Television Service Dealers Association of Pinellas County is sponsoring the convention. Facts About Testing FETs by the beta (gain) of the device. Simply stated, a bipolar transistor is a current amplifier, but a FET is a voltage - to - current converter/ amplifier. The current multiplication factor, or current gain, of a bipolar is called beta. UnfortuBecause these semiconductors behave like transistor nately, no such simple term can be vacuum tubes, they should be tested in a manner used to describe the amplifying ability of a FET, principally besimilar to that used for tubes cause with the FET we are talking about how voltage input affects current output. Fortunately, this FETS VS BIPOLARS cross modulation is readily visible "apples and oranges" problem was Bipolar transistors require a on the screen and because there solved years ago with vacuum forward bias to turn them on. The are usually several different input tubes by the use of a characteristic input signal then "rides" on top of signals present at the tuner called transconductance, which is the bias, to vary the collector cur- (sound carrier, chroma carrier, the ratio of the change in output rent. Typically, the forward bias pic'-ure carrier and, often, adja- current caused by a change in input voltage (1/E.) on a silicon signal transistor is cent channel carriers). A 1 - volt input change which Because FETs are more linear about 0.65 volts at room temperature. An input voltage of 0.6 volts in the presence of a strong input produces a 1 - ampere output will, for practical purposes, turn signal than are bipolar transis- change is I/E = 1/1 = 1 mho of off the device, and 0.7 volts will tors, they reduce cross modulation transconductance. The term mho, which is ohm spelled backwards, drive it into saturation. Thus, the effects. Another advantage of FETs is used to designate transconduccombined bias and signal applied to the emitter - base junction of a compared to bipolar transistors is tance because conductance (I/E) is bipolar transistor cannot vary that FETs can be AGC'ed as effec- the opposite of resistance (E/I). more than 100 millivolts peak to tively as vacuum tubes. Bipolar Because the current through a peak. This corresponds to 50 mil- transistors cannot be effectively tube or FET is usually in milliamlivolts peak, or 35 millivolts RMS, AGC'ed for several reasons: First, peres, it is easier to state that the for a sine wave input signal. varying the bias of a bipolar, even ratio of volts to milliamperes is Worse yet, long before cutoff and slightly, tends to make the device millimhos. One step further takes saturation are reached, the output nonlinear because either the posi- us to volts and microamperes, signal starts to compress, or tive or negative peaks of the which is micro mhos. Thus, a 1 "round off." When cutoff or satura- amplified signal will be flattened volt change in input which causes tion is reached, the compression as the amplitude of the input sig- a 1- milliampere change in output causes the sine wave to take on the nal approaches saturation or indicates that the FET (or tube) appearance of a sqa ire wave, and cutoff. Secondly, internal capaci- has a transconductance of 1000 is commonly referred to as a "clip- tances of the bipolar transistor micromhos (1 milliampere equals ped" signal because of its appear- change, detuning the center fre- 1000 microamperes). The term transadmittance is ance. Such distortion is also quencies of tuned circuits. Thirdused in place of transsometimes impedances input and output ly, termed harmonic distortion, beThe symbol for loading on conductance. the varying change, be can wave distorted cause the analyzed as the original sine wave tuned circuits, which, in turn, transconductance is GM and for transadmittance the symbol is plus generated harmonics. These changes their bandwidths (Q). YFS. metal especially FETs, Modern harmonic products are undesiratransisfield effect silicon oxide tiquipment. receiving ble in Field - effect transistors (FETs), tors (MOSFETs), exhibit signifi- The JFET Fig. 1 is the schematic symbol on the other hand, are able to cantly less change in capacitances for a junction field - effect transisbipolar do than impedances and handle much larger input signals tor (JFET). Notice that the input devices. significant generating without is a junction called the gate. The harmonic products. When a device is "nonlinear," it TYPES, SYMBOLS & TERMINOLOGY output is called the drain, and the All FETs, regardless of type, op- common terminal is called the also tends to "mix" the different signals applied to the input, so erate on the principle of control- source. These correspond to the that they cannot be separated by ling current flow by means of an base, collector, and emitter, rethe tuned circuits which follow the electrostatic field in the same spectively, of a bipolar transistor, device. This results in cross mod- manner that a vacuum tube grid but with one major difference: The ulation, a type of modulation controls cathode - to - plate cur- input junction of a JFET is always whereby one carrier is transferred rent. This is quite different from reverse biased, while the input to another. TV sets in particular the operation of a bipolar transis- junction of a bipolar device is forsuffer from this form of distortion tor, in which a small current in- ward biased. The reverse biased input of the because a very small amount of jected into the base is multiplied By Bernard B. Daien MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 13 JFET cannot inject a current as can a bipolar input junction; its influence on source - to - drain current is achieved through the electrostatic field of its capacitance. (A reverse biased junction is a current flow at zero input bias and the bias is required to turn on the MOSFET to some useful working current, then you are working with an enhancement MOSFET. The term enhancement implies an increase in drain current with capacitor, a phenomenon which is also utilized in varactors, or tuning diodes). bias. If the MOSFET ,runs at high drain current with zero bias and must be biased to reduce the drain current to some useful value, then you have a depletion MOSFET. The symbols for enhancement and depletion P - Channel MOSFETS are shown in Figs. 3 and 4. Those who are familiar with vacuum tubes will have no difficulty in understanding the similarity between MOSFETS and certain types of vacuum tubes. Some tubes used in class B amplifier service are zero - bias types and do not require the usual reverse bias applied to the grid. Other tube types require the application of considerable negative grid voltage to reduce the plate current to the proper no - signal current level. The new symbols and terms are not difficult to master. The JFET gate input is an arrow, which symbolizes a junction. The MOSFET gate input is a capacitor symbol, with a bar for one plate of the capacitor and a space for the The MOSFET Fig. 2 is the schematic symbol for a MOSFET. The principal dif- ference between the JFET and the MOSFET is that the input of the MOSFET is actually a small capacitor instead of a semiconductor junction. The capacitor is formed by laying down an insulating dielectric. This offers an advantage because both polarities of input voltage can be used to control source - to - drain current. (A capacitor has no "forward" or "reverse" voltage.) The method by which the MOSFET is fabricated creates another element called the substrate (also called bulk). This additional element can be employed as a second gate. The MOSFET, like the JFET, influences the flow of current between the source and the drain by means of the electrostatic (capacitive) field created by the application of a voltage to the small capacitance input gate. Because the gate capacitance of the MOSFET utilizes an insulating dielectric, it also is referred to in some literature as an IGFET (insulated - gate, field - effect transistor). Just as bipolar transistors are made with NPN and PNP materials, FETs come in two types: N Channel, and P Channel. The FETs in Figs. 1 and 2 are N Channel, as indicated by the arrow pointing inward. P Channel devices have the arrow pointing outward. The type of channel material determines the polarities of voltage which should be applied to the terminals. You also need to know if the MOSFET is an enhancement or depletion type. Remember, the gate of all JFETs must be reverse biased. If the reverse bias is increased, the drain current is reduced, and this is called depletion. MOSFETs, on the other hand, because of their capacitor input, can be designed to operate with any polarity of input. If the MOSFET is designed to have very little 14 / D (DRAIN) S (SOURCE) G Fig. 1 -Schematic symbol for an N - channel JFET. D (DRAIN) (BULK, OR SUBSTRATE) B S - (SOURCE) Fig. 2 Schematic symbol for an MOSFET. Fig. 3 - Schematic symbol for enhancement type MOSFET. N - a P - channel channel, dielectric. The enhancement MOSFET symbol has broken lines, indicating a normally open circuit which must be closed. The depletion MOSFET is made up of a solid line which indicates a closed circuit which must be opened by biasing. Some FETs have two gate inputs, permitting the use of the second gate for AGC, or for mixing (converter). The symbol for a dual - gate MOSFET (N Channel, depletion mode) is'shown in Fig. 5. Because the input of a FET is either a reverse biased junction or a capacitor, the input impedance is very high (megohms). Consequently, it is easy for an excessively high voltage to build up on the input gate (via static charge, etc.), rupturing the input gate and thereby ruining the device. Many modern FETs use zener diodes to protect the input gate, as shown in Fig. 5. Two zeners are used to guard against overvoltage of either polarity, along with two series diodes to provide "steering" ELECTRONIC TECHNICIAN/DEALER, MAY 1975 GATE) D B S - Fig. 4 Schematic symbol for depletion type MOSFET. Fig. 5-Dual a P - channel, gate, diode - protected MOSFET. AGC R2 = INPUT SIGNAL GATE 2 C2 RF OUTPUT DRAIN C4 GATE 1 SOURCE L2 R3 R C1 L1 +15V - 6 Cross sectional views of and biasing. Fig. a JFET which illustrate JFET operation - Fig. 7 RF amplifier stage equpped with an MOSFET. tion of a JFET which illustrates the operation of the device. Fig. 6A shows a bar of N - type material. protection limits the gate voltage The lower end (source) is conto 8 volts, thus eliminating what nected to a negative voltage, while used to be a very serious problem the top end (drain) is 10 volts posiin the handling and application of tive. The two gate terminals, made of P - type material, are left FETs. When replacing a FET that does floating. Because the N material not incorporate diode protection, is a conductor, current flows do not remove it from the special through the entire bar (shaded protective package in which it area). If you were able to measure the comes until you are ready to use it. at different points on the voltage To insure that no static charge would find the voltage bar, you into you and the set between exists which the FET is to be inserted, distributed equally across its ground everything together (in- length, just as in any resistor. cluding your body). Also, be sure Therefore, if the gate terminals that the soldering iron is are halfway up the bar, they would be located at the 5 - volt points grounded. with higher voltage just above, FET BIASING and lower voltage just below, as The service technician needs to shown in Fig. 6A. In Fig. 6B, the gates have been know how a FET is biased, because part of the bias is actually tied to the source, putting the P generated internally, and also be- type gate material at zero volts pocause the primary differences be- tential with respect to the source. tween FETs and bipolar transis- Since the tops of the gates are at tors, so far as the service aspect is the + 6 - volt point on the bar, a concerned, are in the input/bias reverse potential of 6 volts exist circuit. You cannot test the ratio of across the junctions formed by the gate - to - source resistance of a P material gates and the N mateMOSFET with an ohmmeter the rial bar at that point. Because of way you check out a bipolar tran- the high reverse bias, no current sistor. In a MOSFET there is no flows in the vicinity of the reverse "forward" resistance, only "re- junction, as denoted by the white areas at the junction interfaces. verse" resistance. At the bottoms of the gates, the If you are using an ohmmeter which uses a 1.5 - volt or lower reverse bias is only 4 volts; therebattery (such as a multimeter on fore, because of the weaker electhe RX10 range, or a multimeter trostatic field, the reverse field or VTVM with a "low - power" does not extend quite so far into ohms range), you should read an the bar. The result is a wedge open circuit (infinite resistance) shaped nonconducting area which between the gate and either the constricts the source - to - drain current flow. drain or the source. In Fig. 6 C, the drain voltage is Fig. 6 is a simplified cross secfor the zeners. Most FET's can withstand at least 20 volts of gate input. The zener/diode type of gate N - channel, depletion type increased to 20 volts, twice the voltage used in Fig. 6B. Because the voltage along the bar also is increased by a factor of two, the tops of the gates are now opposite the 12 - volt points on the bar, and the bottoms of the gates are at the 8 - volt points. The increased reverse bias enables the reverse electrostatic fields, generated by the reverse - biased gate junctions, to touch each other. This "pinches off" the current flow through the device, reducing the source - to drain current to about zero. Different JFETs have different pinch off voltages, and you must consider this difference when trying to substitute one FET for another, even though they are similar in most other respects. From the preceding you can see that the JFET can "bias itself," even with the gates returned to ground. The degree of self - biasing depends upon the voltage applied between drain and source. The JFET will conduct with a low voltage between source and drain, but will reach pinch off as the voltage increases. In a receiver, if the drain supply should increase (as, for example, when a series of regulator shorts), the FET will pinch off, making it appear as if the FET were open or the bias were incorrect. This can be a fooler; so before you check anything else, always check the supply voltage that feeds the FET. JFETs are very voltage sensitive in this regard. A JFET also can be pinched off by application of a negative voltage to the gates. This method is seldom used because the inherent ability of the FET to cut off itself MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 15 with zero or some small positive forward junction indication using voltage is more convenient, and, the gate as one terminal, the gate because it avoids the need for a is open. negative bias supply, it is more A MOSFET has no "forward" economical. gate junction, so you cannot use an Although the two opposite gates ohmmeter to check it, except to of the JFET provide the pinch off test for a shorted gate. Open gates action, it is not necessary to tie the are not detectable with an ohmtwo gates together. Instead, one meter. In certain diode - protected gate can be used as a signal input MOSFETs, the ohmmeter voltage with a fixed bias, while an AGC might be sufficient to indicate voltage is applied to the other what appears to be a "leaky" gate, gate, to adjust the gain of the FET. but this is deceptive because the MOSFETS operate in a manner input protecting diodes are doing similar to the JFET except that the conducting, not the gate itself. they can be designed so that the At this point, it should be appadevice is "off" until some bias is rent that the methods used for applied to turn it on (enhancement testing bipolar devices are not usetype) or they can be designed to be ful for testing FETs. The clue to fully "on" until an inhibiting bias proper testing of FETs lies in their reduces the drain current to the very name: "field - effect transisdesired value (depletion type). tors." They control (amplify) curBecause we now know that the rent by increasing or decreasing current in a FET depends upon the an electrostatic field between the value of drain voltage applied to it source and drain. The strength of as well as the amount of bias, it is the field is dependent upon the apeasy to see that the application of plication of the proper voltages to correct values of voltages are es- all terminals. sential to the operation of a FET. This need for correct voltages In contrast, the collector current of indicates a need for dynamic testa bipolar transistor is less depen- ing, which can be accomplished dent on the collector voltage be- right in the circuit. The simplified cause the collector current is de- schematic in Fig. 7 illustrates how termined principally by the beta this can be done. times the base input current. The device in Fig. 7 is a MOSFET (N Channel, depletion mode). TEST PROCEDURES You might be asking yourself, When examining the drain - to - "How would I know the type if I source characteristics of FETs didn't have the schematic before during servicing, you might be me?" To do so, you'd have to do surprised to note that ohmeter some "detective" work. One way tests of a JFET will indicate good that works in some instances is to conduction in both directions. This use one of the new semiconductor is because, as shown in Fig. 6, the testers which "self - programs" to drain - to - source path is a con- test any transistor or FET, regardducting bar in which the same less of type. The in - circuit testing amount of current will flow in functions of these testers are geneither direction, as in a resistor. erally reliable when they indicate There is no PN junction in series a "good" device, but most do not with the drain - to - source path. reliably indicate a defective deFor this reason, you cannot test vice. Incorrect supply voltages, the source - to - drain path of a FET shorted components, etc., can properly with an ohmmeter. "fool" such testers into indicating However, the input of a JFET a "bad" device. does have a "forward" and "reThis points up the need for verse" junction between the gate schematics when working on the and the bar material. (The drain new solid - state sets, many of and the source are in reality con- which are equipped with other nected to each other at each end of hard - to - identify devices such as the bar.) Thus, if you cannot ob- silicon controlled rectifiers tain a reverse - biased junction in- (SCRs), darlingtons, etc. To atdication with the gate as one ter- tempt to service such equipment minal, the gate is shorted (a com- without adequate service data is mon defect). If you cannot obtain a false economy. reverse - biased junction and a The circuit shown in Fig. 7 is an 16 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 RF amplifier, similar to those used in the tuners of TV and FM receivers. The first step in testing this FET is to determine if the FET is conducting at some reasonable level of current. A quick check of the voltage drop across the drain resistor will reveal this. The supply voltage also should be checked at this time. If the supply voltage at the "bottom" of the drain resistor is normal and the FET is drawing no current, than a quick check should be made to determine if the supply voltage is actually being applied to the drain. An output coil (L2) might be open. With power off, the bypass capacitor (Cl) across the series source resistor (Rl) should be checked; if it is shorted, there will be no voltage across the source resistor. These are all simple tests like those that you would perform on a vacuum tube amplifier if you had no tube checker. If you can think of the FET in terms of a vacuum tube instead of as a semiconductor, you can successfully test FETs. As a matter of fact, the FET is often referred to as a "solid - state tube," and justifiably so. If correct voltage is being applied to the drain and the source bypass capacitor is not shorted, next check Gate 1, which is grounded via resistor R3. There should be zero DC volts on it. If Gate 1 is shorted, there will be DC voltage on it. The potential on Gate 2 is checked next to see if the proper voltage exists on it. There might be a defect in the AGC chain. Because FETs do not "wear out," or lose emission, as do tubes, look only for shorts or opens. As in a tube circuit, if all element potentials are correct and the FET is drawing reasonable current, the defect probably is in another related stage. Once again, the key words are, "as in a tube circuit." If you will think back, the only time a tube is defective, with applied voltages all correct, is when the emission of the tube has decreased. (Gas and internal grid emission also are not problems with FETs, and therefore, are also omitted from consideration.) Incorrect biasing affects drain current and, in turn, shows up as a voltage error (for example, across the source resistor). Replace 427color picture tubes with only 74 RCA types. ncn Color PictureTubeTypes and their RCA Replacements RCA Matrix #Cite Colorama A Coiorama Find the correct color picture tube replacement quickly and easily with RCA's new 1975 Color Picture Tube Replacement Wall Chart, available now from your RCA Tube Distributor. You'll find that only 74 RCA types will replace 427 industry types. The chart covers all three RCA Hi color replacement lines Lite, Colorama A and Colorama. In the Hi -Lite line of all -new premium replacements, just 3 "V" 23VAL, 19VAB and types will replace 213 of 18VAH today's best-selling industry types. The chart also shows RCA Matrix types available in all three lines. These advanced RCA tubes have as much as twice the brightness of any equivalent non -Matrix tube. See your RCA Distributor and ask for the 1975 RCA Color Picture Tube Replacement Wall Chart (1D1548) where one quick glance tells you the right replacement. And remember, RCA is the worldwide leader in picture tubes with over 65 million produced - -- to date. RC,' RCA Distributor and Special Products Division Cherry Hill, New Jersey 08034 I MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 17 (Courtesy of GWU Photo.) Medical ElectronicsA Healthy New Field For Servicers By Joseph J. Carr, ET/D Contributing Editor Although most electronic service firms and technicians are aware of the dramatically increasing use of electronic technology in a variety of medical - related applications, few have seriously in- firms or technician who is willing and able to provide the proficient, quick - response service required by medical care facilities. For example, one eastern medical available in medical electronics servicing, principally because they believe that the skill and knowledge required to service such equipment exceeds their present capabilities. This belief is based on the assumption that any equipment which often plays a vital role in life and death situations, and which is as expensive as most medical electronic equipment is, must be extremely com- electronic service firms an average of $25 an hour for "time and travel" (travel time and service labor), with "time and travel" charges for each service call during the period averaging $88. Pay for medical electronic service technicians ranges from about the level paid TV benchmen to significantly higher levels, depending on such factors as geographical location, competition, overtime, etc. One firm with which I am familiar has six "field" technicians, all of whom average between 10 and 30 hours of overtime each week. In the following paragraphs, the electronic technology in representative medical electronic equipment is examined so that you can decide for yourself whether or not it is more complex than that in consumer electronic products and, consequently, whether or not your present electronic knowledge and diagnostic skill will permit you to center reports that during the vestigated the opportunities period 1971 - 73 it paid several plex. The fact is, although a few types of medical electronics equipment, such as that used in radiology/ nuclear medicine and in some lab applications, do contain more complex technology than that in consumer electronic products, most medical electronic equipment which can be serviced locally is no more complex than a color TV receiver. Most medical electronic equipment is more expensive than comparable consumer electronic products, principally because fewer of a particular medical electronic product are needed and therefore fewer are produced, and because most medical electronic products must be more accurate and more reliable than consumer electronic products, which means better materials, closer tolerances and more stringent quality controls, all of which increase the cost. The higher initial cost plus the fact that some medical electronic equipment must be serviced on an immediate, around - the - clock basis means that servicing it can be very profitable for the service enter this relatively lucrative, new service field. BLOOD PRESSURE METERS In operating rooms (OR) and Intensive Care Units (ICU) it is sometimes necessary to continuously monitor blood pressures in particular patients. Because this would be difficult to accomplish manually, electronic equipment is used. While veinous (de - oxygenated, returning to heart) blood tends to flow evenly at low pressure, arterial (oxygenated) blood is pulsitile and at substantially higher pres- 18 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 sures. Pressure peaks occur when the heart is in contraction, thereby forcing blood into the main arteries. This period of heart contraction is called systole. Pressure will fall to a minimum, but not all the way to zero, when the heart relaxes (diastole), allowing the lower heart chambers to refill with blood. The maximum and minimum pressures created over this cycle are the source of the two numbers quoted whenever somebody takes your blood pressure (BP). Fig. 1 shows a pressure - vs. time graph for blood pressure of 120/80. Almost everybody is familiar with the manual means for obtaining a person's blood pressure. That technique uses an inflated cuff to shut off (occlude) the flow of blood in an artery of your arm. Once this is done, pressure in the cuff is slowly released while the operator simultaneously listens to the artery with a stethescope and watches a pressure gauge. When the cuff pressure drops to a point equal to systolic blood pressure, blood will spurt through the occlusion, creating distinctive sounds called Korotkoff sounds. These sounds disappear when the cuff pressure equals diastolic pressure. Pressure valves are read from the guage at the points indicated by the sudden appearance (systolic) then disappearance (diastolic) of Korotkoff sounds. There also are at least three electronic methods used for measurement of blood pressure. One type of blood pressure meter uses an automatically inflated cuff and a microphone placed over the artery just below the occlusion. Active filters inside the equipment separate the low - frequency Korotkoff sounds, providing start/stop criteria for circuits INTRODUCING AT JUST ßllß$i1M1Eß STILL ONLY ONE YEAR GUARANTEE ,- U.S.A.'311° ONLY ALL PARTS INCLUDED WITH CABLES EXCEPT TUBES AND TRANSISTORS PROVIDES YOU WITH A COMPLETE SERVICE FOR ALL YOUR TELEVISION TUNER REQUIREMENTS. FEATURES A UHF Tuner with 70 channels which are (U.S.A. ONLY) $ 9.95 VHF OR UHF ANY TYPE (U S.A ONLY) $15.00 UHF/VHF COMBINATION IN THIS PRICE ALL PARTS ARE INCLUDED. Tubes, transistors, diodes, and nuvistors are charged extra. This price does not include mutilated tuners. Fast, efficient service at our conveniently located detented and indicated just like VHF channels. A VHF Hi Gain Solid -State Tuner Service Centers. tuners are ultrasonically cleaned, repaired, realigned, and air tested. All REPLACE AC Powered UNIVERSAL REPLACEMENT TUNER $12.95 (U.S.A. only) This price buys you a complete new tuner built specifically by Sarkes Tarzian Inc. for this purpose. All shafts have a maximum length of 10'/2" which can be cut to 11/2". Specify heater type parallel and series 450 mA. or 600 mA. 90 -Day Warranty Demonstrate the your customers and show improved reception with their TV sets. rirmrimto CUSTOMIZE You may place your order through any of the Centers listed below. TSC TUCSO FLORID TA' ILLINOI ++' L 5. IOWA H l , A WEST FIES SPRING SHREVEPORT, BALTIMRE, M D, AS. TON, NEW J JERSEY CITY NEW J CINCINNATI. HIO 45216 CLEVELAND. HIO 44109 REGON 97210 PORTLAN VIRGINIA WISCONSIN MILWAUKEE, WISCONSIN 53216 CANADA el. 413.788-8206 Tel. 314-429-0633 MAS LOUIS, GREENEVILLE, TENNESSEE 37743 MEMPHIS, TENNESSEE 38111 DALLAS, TEXAS 75218 NORFOLK, VIRGINIA 23513 TEXAS 53-0324 4-0914 8-2232 356-6400 12-873-5556.7 12-675-0230 19-845-2676 17-632.3493 15-277-0155 02-634-3334 18-221.3027 301-358-1186 , MASSACHUSETTS OREGON TENNESSEE 1-8051 e CH AG K KIE, I HA. MON 1NO LOUISVILLE, OHIO Tel. 812-334-0411 Tel. 6 - 91-9243 Tel. 2 3-7-2720 ,1. 5-3 -5728 NTA, GEO AIGN. IL KENTUCKY LOUISIANA MARYLAND MISSOURI NEVADA NEW JERSEY ... 537 South Walnut Street P.O. Box 4534, 1528 S. 6th Ave. 10654 Magnolia Boulevard en Rbad :ID U. RDAL FT i INDIANA GROW 47401 BLOOMINGTON, INDIA ONA 85796. ALIF. 91601 RTHJ LY` ' F. 94i ME, C B - - 1 MO' 't O. CALIF HEADQUARTERS ARIZONA CALIFORNIA GEORGI WATCH US Customized tuners are available at a cost of only (U. s. A. only) $15.95. With trade-in $13.95. Send in your original tuner for comparison purposes to any of the centers listed below. ST. LAURENT, QUEBEC H4N-2L7 CALGARY. ALBERTA T2H-OL1 1412 901 .Tel. 702-384.4235 est I'rth 547-49 Tonn 7450 Vine S oa 4525 Pea 25th Avenue 1732 15 napps Ferry Road i . 3 arron Avenue 11540 Garland Road 3295 Santos Street 4722 W. Fond Du Lac Ave. 305 Decarie Boulevard 448 42nd Avenue S.E. P O. Box 5823, Stn. "A" Tel. Tel. Tel. el. I. I. I. Tel. Tel. Tel. Tel. Tel. 609-393-0999 201-792-3730 513-821-5080 216-7a1-2314 503-222-9059 615-639-8451 901-458-2355 214-327-8413 804-855-2518 414-871-7655 514-748-8803 403-243-0971 IF YOU WANT TO BRANCH OUT INTO THE TV TUNER REPAIR BUSINESS, WRITE TO THE BLOOMINGTON HEADQUARTERS ABOUT A FRANCHISE. ...for more details circle 130 on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 19 180- LEAD 160- A RALA LA 0 NOTCH 120100- form. In a few models there also is a logic circuit designed to display ELECTRODES II RALL III CELL AVR RA AVL LA - ILA - ILL HOF LL - (RA VI -V6 C IS C- the diastolic and systolic pressures on either an analog or digital meter calibrated in millimeters of mercury pressure. These are mostly clocked - capacitor, peak - + LL) RA) (RA LA) LA LL) holding circuits. PHYSICALLY MOVED TO ACCOMMODATE THE SI% DIFFERENT V LEADS RL 60 Ll ECG RECORDERS .41-DIASTOLE-to. 40- rc 20- The electrocardiogram (ECG) is a voltage - vs. - time graph of an electrical signal generated by the LEAD SELECTOR SWITCH PRE AM P o TIME IN SECONDS Fig. 1-Waveform generated when blood pressure is plotted against time. For arterial pressure, the minimum, or diastolic, pressure never falls to zero but does decrease to a minimum. This waveform shows a pressure of 120/80. f Fig. 3-Sources and means of obtaining input to electrocardiograph (ECG) strip recorder. A) Standard locations and configurations (composition) of ECG "leads." Leads I, Il and Ill are simple voltage drops. "A" (augmented) and "V" leads are composite voltage drops developed when one input to the ECG differential preamplifier (B) receives a signal from a single electrode and the other Input receives signals simultaneously from two or three other electrodes. FLUID PRESSURE DIAPHRAGM n CARRIER INPUT 5 VAC P.P @ 2.4 KHz 200n OUTPUT Fig. 2-Blood pressure can be measured elec- tronically with a saline column placed in the patient's arterial system. Pressure in the column flexes the diaphragm in the transducer. This couples to either the movable core of a differential transformer inductance or to one arm of a resistance Wheatstone Bridge. Typical medical transducers fit nicely Into the palm of the hand. measuring cuff pressure. Other types of BP equipment, notably the well - known Roche Arteriosonde, uses an ultrasonic flow detector (Doppler) to control the measurement. These two techniques have the advantage of being noninvasive; that is, nothing is placed inside the patient's body. Fig. 4-Stylized version of the normal Lead human ECG waveform. Letters P, Q, R, S, T and I U designate certain major features. Actual amplitudes and shapes tend to vary from one patient to another, but one can expect the maximum amplitude of the R -wave to be around 1.0 millivolt. variable resistance or the core of a special inductor. Excitation to the transducer can be either DC or AC. In resistance Wheatstone bridge transducers, either DC or AC can be used. However, only AC Invasive measurements are can be used in inductive types. those in which a probe, electrode, Hewlett - Packard carrier amplitransducer or other object must be fiers used for monitoring of blood placed inside some portion of the pressure generally provide a 2.4 patient's body. Such techniques KHz, 5 - volt p -p signal. are, by far, most often encountered Most blood pressure meters are in the measurement of blood pres- equipped with either a waveform sure. In most, a fluid column (a output jack or an internal oscillosthin, saline - filled catheter) is cope so that the actual pressure surgically placed inside an artery waveshape can be viewed. Once of the arm or wrist. This simple the waveform is calibrated with a procedure is performed by a doc- known zero point and another tor. Pressure variations in the known point (usually 200 mm, blood are coupled through the Hg), it is a simple matter to read saline solution to a transducer diastolic and systolic pressure port where they flex a diaphragm values from the minimum and (see Fig. 2) which drives either a maximum points on the wave20 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 human heart. Electric current generated by the cells of the heart is propogated to all parts of the body by the electrical conductivity of tissues. A signal waveform of the voltage drop between two points on the surface of the skin can be picked up by simple disc electrodes pasted or strapped in place on the skin. The signal is processed in a differential amplifier. Several different common voltage drops used by medical people are detailed in Fig. 3A. These voltage drops are called "leads." (This word choice might be confusing to electronic technicians, who associate the word "lead" with a length of wire.) Fig. 4 is a stylized representation of the waveform obtained when the Lead I voltage drop is plotted by a strip - chart (paper) recorder. The letters P, Q, R, S and T in Fig. 4 help identify standard major features of the waveform. Keep in mind that a waveform from one particular pa- tient might be quite different than that from another. This fact might cause a few problems for the servicer who is not used to testing equipment of this sort. ECG strip chart recorders, probably the most widely used type of medical electronic equip- ment, are found in a number of configurations: suitcase - mounted, for portable use; in roll around carts, for general hospital use; and in permanent bedside installations, for use in ICU/CCU. These machines provide a written record of the ECG waveform as viewed on an oscilloscope. Actual writing is done by an analog pen onto a strip of 50 mm wide special paper. Paper is transported past the pen at a rate of either 25 or 50 mm per second, thus establishing the horizontal time base. The pen of the recorder is driven push - pull by a galvanometer; vertical de - flection varies as the voltage varies. Although some ink - type pens are used, the majority of ECG strip recorders use a hot - tip pen which thermally etches the tracing onto special paraffin - treated paper. The tips of such pens are equipped with an electric heating element which operates at low voltage. The heated pen tip rubs against the paper. When the paper is heated by the pen, it turns black, leaving the trace. When the analog pen is in the center of the paper, the input voltage to the amplifier input is zero. If the voltage goes positive, the pen will deflect upwards. If the voltage goes negative, the pen will deflect downward. Most ECG machines develop only a relatively limited number of problems. Most can be field serviced with a parts supply easily carried in a briefcase, a tool box or a tube caddy. For openers, operate the equipment or have someone operate it for you. A surprising number of problems occur simply because the user is unfamiliar with the equipment. This is especially true where there is a large part - time medical staff. Look for insufficient sensitivity, incor- rectly loaded paper, etc. Also, ex-ect to replace a lot of styli. The input of an ECG amplifier is differential, to suppress common mode, 60 -Hz power line interference. Should one leg of the cable connected to the patient become open, either by accidental disconnection or by breakage, the 60 -Hz interference will become a differential signal and will appear on the ECG tracing. If it is of sufficiently high amplitude, it can drive the stylus against the high or low - end stops, breaking or bending the pen. In other cases, age or excessive heat will cause the heating element to open. In either event, replacement is the cure. Also, expect to replace lamps and power switches. One very common switch failure is the SPST pushbutton standardize switch. When pressed in, this switch applies a 1.0 - my pulse on the trace, for amplitude calibration. In older units, you will replace a few 12AX7 tubes. New equipment is, of course, solid state. Fig. 5 shows another type of ECG monitor: Hewlett - Packard's Fig. 5-Self - contained medical monitor system for use in operating rooms, intensive and coronary care facilities and emergency rooms. (Courtesy: Hewlett - Packard.) Model 7830A, which is often found in emergency rooms (ER), OR, ICU and CCU monitoring systems. It is designed for applica- tions that require an immediate view of the ECG without the need of a written record, although that also is available as an outboard accessory. It includes an internal oscilloscope with optional dual trace capability, and ECG preamplifier, a heart - rate meter (cardiotachometer) and an alarm system, all integrated into a single cabinet. The cable shown in the illustration is connected to the surface electrodes pasted on the patient's skin. Heart rate is indicated on the screen of the CRT by a horizontal line (in the lower left quadrant) whose length is proportional to the heart rate in beats per minute. Figs. 6 and 7 show similar equipment in different configurations. equipment to normal operation in the shortest time possible and with minimum interruption to his customer's routine. Nowhere is this more important than in medical electronic servicing. Recognizing this essential need, most manufacturers of medical electronics equipment use plug - in printed circuit boards similar to those in modern TV receivers. An example of such a design is shown in Fig. 8, which is a photo of the interior of American Optical's bedside monitor. The defective circuit "card" is replaced so that the patient is back on a monitor as soon as possible. Remember, the patient might have just been through dangerous surgery or a heart attack. Your customer will be less than happy if you take too long to repair such a vital means of acquiring information on the patient's condition. Defective cards can be repaired back at the shop or BEDSIDE returned to the manufacturer. MONITORING EQUIPMENT The relative simplicity of most monitors is revealed in the of bedside One of the primary goals any field servicer, regardless of what block diagram in Fig. 9. Although he is repairing, is to return the there is probably no specific make MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 21 and model of equipment which has all of the features shown in Fig. 9, the basic design in this illustration is typical of the entire class of cardiac monitor instruments. Packaging is one characteristic which varies widely from one manufacturer to another. Many, such as older models of American Optical monitors, use completely integrated, nonmodular packaging, with little servicing flexibility. Newer models, however, are modularized, with individual sections which can be pulled intact from the mainframe for service. In such cases, the scope, ECG amplifier, etc., are separate modules in a common cabinet. Both this "semimodular" design and a completely modular design are used by Hewlett - Packard. Some of their units are completely free standing. For example, the 7800 series of monitoring equipment includes a two - channel oscilloscope, Model 7803B, which is packaged in a half - rack cabinet such as that of the 7830 in Fig. 5. A heart rate meter, Model 7807C, produces the ECG signal, a DC meter output for heart rate and an alarm function. Models 7809 and 7819 are arterial pressure and venous pressure/patient temperature modules, respectively. As mentioned previously, preamplifiers for ECG use are differential input types because of 22 / ELECTRONIC TECHNICIAN/DEALER, Fig. 6-Wall mounted cardiac monitor system. Fig. 7-Portable cardiac monitor system. (Courtesy of General Electric.) the existence of large common mode interference signals from 60 -Hz power lines and other electronic devices in close proximity to the patient. Because most of the information present on the ECG waveform is contained within the band from 0.5 Hz to 100 Hz, most ECG preamplifiers are designed to pass only signals within this range. For long - term monitoring, this range is reduced even more, to eliminate noise from 60 -Hz and "biological" signals generated by the patient's skeletal muscles. The high - frequency response of such instruments rolls off somewhere between 30 and 45 Hz. A few models have selectable bandwidth, for both monitoring and diagnostic purposes. ECG preamplifier output waveforms are fed to several points in the monitor or to equipment external to the module. Some of these are an output jack for remote monitoring, and internal scope or chart recorder, and a cardiotachometer (heart rate meter). In many cases there also will be a low - level out- MAY 1975 put on the fron panel, for use in driving external recorders and for synchroniz:ng defibrillators and cardbverters. The usual source for this signal is the regular output signal which is fed through a 60 -dB resistive voltage divider. Monitor oscilloscopes use the same 25 and 50 mm-per -sec and sweep as the recorders. Otherwise, the trace would look different on paper than it does on the screen of the scope and would lead to a lot of confusion. Because a typical medical scope will have a CRT width of 10 cm, a .25 - Hz sawtooth sweep oscillator is usually used. This gives the required 25 mm - per second sweep, which crosses the CRT screen in 4 seconds. Most electronic technicians are surprised to learn that most medical oscilloscopes are relatively simple compared with a modern TV service oscilloscope. TV bench scopes must use electrostatic deflection because of the relatively high vertical amplifier bandwidth required for color TV servicing. Electromagnet (yoke) deflection is troubleshooting such monitor scopes. Fig. 8-Modular construction and plug - in printed - circuit cards are required to insure rapid bedside service. Printed - circuit cards can be either repaired back at shop or returned to factory for exchange or repair. ISIGNAL FROM PATIENT ECG CARDIOTACHOMETER PREAMP ALARM CIRCUIT CARDIOTACH LEAD SELECTOR LOGIC 100K "DIFIB SYNIC" 0 100n SIGNAL TO INPUT OF REMOTE SCOPE AT NURSES' STATION 2.1 2 -CHANNEL VERT CHOPPER AMP B L IN Fig. CRT DEFLECTION YOKE 9-Block diagram of typical cardiac a SWEEP GENERATOR .L monitoring system. ECG INVERTER AMP MONOSTABLE INTEGRATING LOW-PASS FILTER MULTIVIBRATOR METER CORRECTION METER -3 VDC REMOTE 0 300 OUTPUT FOR 0 DIGITAL DISPLAY - MILLIAMMETER CALIBRATED 0 300 BPM - Fig. 10-Block diagram of a typical cardiotachometer circuit. Positive - going R -wave triggers a monostable (one - shot) multivibrator which produces pulses of constant amplitude and duration. ntegrator section (a low - pass filter) converts these pulses Into a DC level proportional to heart rate. n the Hewlett - Packard system, 0 - 300 beats per minutes (BPM) is represented by a DC range of 0 - 3 volts. limited to applications involving frequencies no lower than the high audio or low ultrasonic range. In medical applications, however, 1000 Hz is the maximum vertical amplifier frequency, and 100 Hz is more commonly used. Because of the low bandpass requirements, both electrostatic and electromagnetic deflection systems are used. For example, American Optical uses electrostatic, while Hewlett - Packard uses a yoke. In yoke systems, the similarity be- tween the sweep sections of the scope and that of b -w TV receivers is most interesting. Sanborn's (H -P's predecessor) wall - mounted monitor scopes use circuitry straight out of TV textbooks. In fact, the flyback transformer replacement supplied by Hewlett Packard for these scopes is a universal replacement type (Triad) made for Wells - Garner TV receivers. In light of this, it is a safe bet that the TV technician would not be on unfamiliar ground when Regardless of the deflection system used, all medical scopes are equipped with a long - persistance CRT phosphor so that all of the salient features of each waveform complex can be viewed at the same time. Even this, though, isn't as good as the storage function built into modern medical oscilloscopes. Some newer scopes use one of two types of storage mechanism. A few use the same "special CRT" method used in many laboratory type scopes. Others use digital storage techniques in which the analog signal is first digitized then stored in either a recirculating shift register or in one of the modern solid - state computor memory ICs. The current ECG signal is displayed by such scopes in "real time" in the upper left hand corner of the screen. Immediate past ECG complexes are shifted in position across the screen and, therefore, trail off to the right. This type of scope is popular with medical users because it allows them to compare both the current ECG and the past few immediate complexes for up to several seconds. Cardiotachometers are circuits which measure heart rate in beats per minute. Fig. 10 is a block diagram of a popular cardiotachome ter used by Hewlett - Packard in the 7807 heart rate meters. ECG analog signals may have either polarity despite the general shape shown in Fig. 4. The first stage, then, is an absolute - value type of amplifier in that it has only positive - going output signals. These are fed to the monostable multivibrator as trigger pulses. -This circuit is designed to produce one and only one output pulse on receipt of a trigger pulse. These output pulses will all have the same amplitude and duration; only the number per minute will change as the heart rate changes. These pulses are integrated in the low - pass filter, producing a DC output voltage which is proportional to heart rate. A meter correction circuit keeps the 0 - 100 BPM section so that the most used portion of the scale has the highest resolution. Interestingly enough, Hewlett - Packard chose to use 0 3 VDC as the range for the DC continued on page 44 MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 23 Showroom MAN By J. W. Phipps A super sales aid and source of profit for retailers and servicers A TALE OF A LOST SALE cosmetic features. Mr. Consumer asked about Mr. and Mrs. Ameri- the price, and when Mr. can Consumer had been Ace told him, Mr. Ace thinking about buying a could tell by Mr. Connew color TV for about sumer's reaction (or lack two weeks. Then Mr. of reaction) that the price Consumer saw in his at least was no more than morning paper an ad an- Mr. Consumer expected nouncing a special color to pay, and possibly less. TV sale at Ace's TV Sales Mr. Ace then turned on & Service. He showed the the receiver, switched it ad to Mrs. Consumer and to an active channel and suggested that they visit began explaining the Ace's after supper that "automatic" operating evening. Mrs. Consumer controls. However, Mr. agreed, and that evening Consumer quickly interthey visited Ace's show- rupted him and asked room. why there were shadow Mrs. Consumer told like images and little Mr. Ace that they we/ peckles" in the picture. interested in a large `r. Ace attempted to screen console with 'lain in layman's Mediteranean style ca ms that the shadows Met. Mr. Ace confidenti d little "speckles" guided the Consumes .ise) were not caused across the showroom to the set, and just as Mr. demonstrator console ce got around to stating model which seemed ti ie the reception would be exactly what the Con e much better in the sumers were looking for .onsumer's home, Mr. Mrs. Cr, inmer seemea 'onsumer remarked very pl ' d with the hat their old set at home appear of the produced the same kind cabinet Mr. Ace of picture. He then took pointed t a number of Mrs. Consumer by the 24 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 arm, said that perhaps they should look at a couple of other brands before making a deci- in the sale of color TV, FM radio and home an- tenna systems. Unfortunately, real - life versions sion, and, before Mr. Ace of this scenario are occould react, the Consum- curring too frequently in ers were out the show- the showrooms of home room door. entertainment electronMr. Ace stood there, ics retailers throughwatching the showroom out the country. Sales door swing shut behind are being lost because Mr. and Mrs. Consumer consumers are not being wondering what went shown the crisp, diswrong. Half way through tortion - free reception the presentation it which most color TV and seemed to him that he FM radio receivers are was well on the way to a capable of producing sale (of which he had not when they are connected seen too many lately); to a well designed, propthen, right after he erly functioning antenna turned on the set, the system. Consumer's enthusiasm During the late 1950's had suddenly waned and and throughout most of they had abruptly left be- the 1960's, the majority fore he had even reached of color TV buyers were the "closing" phase of his buying their first color sales presentation. TV receivers and consequently did not really WHY BETTER SHOWROOM know what quality of picMATV ture they should reasonSYSTEMS ARE NEEDED ably expect. Color TV The preceding scenar- was still somewhat of a io is a fictional dramati- novelty and many viewzation which points up ers were satisfied so long just how important a role as there was merely some live demonstration plays color on the screen. The MATV system for a home entertainment electronic showroom should provide sufficient numbers and proper placement of outlets to permit connection of all TV and msot FM radio in the showroom. If the portable TVs on the shelves along the walls were the only sets connected to the MATV system, it would make It difficult for salesmen to Interest customers in the more expensive (and usually more profitable) table and console models on the floor. (Courtesy of Blonder - Tongue.) A showroom MATV system should include appropriate outlets in the FM radio display area. (Courtesy of Blonder - Tongue.) Today, with approximately 65 percent of the households in the U.S. equipped with color TV, it is no longer a novelty and consumers are more significantly more de- style and cosmetic fea- once a customer actually manding than first - time tures are still prime con- sees the clear, crisp, discolor TV buyers were in siderations in a con- tortion - free color TV sumer's decision to buy picture produced by a the past. The fact that consum- or not to buy a particular properly operating com- enced poor reception are (or will be) looking for improved reception from their next color TV. Those who have experienced good or excellent reception are (or will be) expecting nothing less than this when it comes must be prepared to demonstrate high quality color TV reception in their showrooms. The combination of an inflated, depressed economy plus increased saturation of the color TV market have made color TV a hard sell (at least for the present, if not long term). Consumer spendable earnings are down and color TV prices effectively have increased. Consequently., consumer awareness of price has increased at about the same rate and at about the same time as consumer awareness of picture quality. Although price, ease of operation, warranty, and the aesthetics of cabinet ers today are more dis- knowledgeable about criminating about color what quality of color TV TV picture quality is not picture they should the only reason that reasonably expect. Those home entertainment who have to date experi- electronics retailers time to replace their present color TV or buy a second set for the den or bedroom. Most of the 35 percent of U.S. households who have not yet purchased a color TV receiver have nevertheless had sufficient color TV viewing experience at friends' and relatives' homes to realize that color TV reception can be clear and distortion - free, and most therefore will be bination of color TV receiver and MATV system, it doesn't take much sales effort to sell the or all of these factors to customer on the concept some degree if they are of a "total color TV recepadequately impressed by tion package." the quality of the picture SERVICERS CAN produced by the receiver. PROFIT TOO Thus, the high quality of need of reThe urgent the picture produced by a well designed and prop- tailers for well properly erly operating showroom designed, MATV system can put functioning showroom the consumer in a more MATV systems offers electronic servicers the flexible buying mood. In addition to helping opportunity to break into the dealer sell more and the MATV installation higher - profit color TV business by selling to and FM radio receivers, and installing a showa properly operating room MATV system for showroom MATV system home entertainment also can help a dealer sell electronics retailers who home MATV systems, do not have a service deeither separately or as partment or who for part of a "total color TV some other reason are reception package" con- not in a position to install sisting of a color TV re- their own showroom sysceiver and a complete tem. Either before or home MATV system. after a servicer installs Seeing is believing, and an MATV system in such color TV receiver from a particular dealer, most consumers will compromise, or trade off, any MAY 1975, ELECTRONIC TECHNICIAN/DEALER 125 Yagi antenna farm of a typical showroom MAN system. One single channel antenna is provided for each active TV channel. Mounted on the mast below each antenna Is a preamp. (Courtesy of Blonder - Tongue.) Close - up view of four of the antennas of a typical showroom MAN system. Each of the three large antennas are designed for reception of a single N VHF channel, and the smallar antenna is for 7V UHF reception. (Courtesy of Blonder - Tongue.) TV signal tapoff shown here supply signals for two demonstrator TV receivers. Note that it is located in a relatively "hidden" area and is positioned adjacent to a dual - receptacle power outlet. (Courtesy of Blonder Shown here is the head end equipment tor a typical showroom MAN system. An MCA single channel amplifier is used for each TV VHF channel, and an MCS-U UHF amplifier is used for each TV UHF channel. (Courtesy of Blonder Tongue.) a dealer's showroom, he can negotiate with the dealer for installation of all home MATV systems sold by the dealer. Some servicers in- - Tongue.) Blonder Tongue Model 3416 matching transformer matches impedance of RG -59 coaxial cable to input impedance of FM/stereo FM receiver. MATV installation to them on an exclusive basis. mutually Both VHF and UHF signals are fed to each receiver via a single coaxial cable and then separated by a VHF/UHF band separator immediately before application to the respective VHF and UHF antenna input terminals of the TV receiver. "Alligator" type clips make connection and disconnection simple and quick. (Courtesy of Blond- er - Tongue.) agreeable price. In this way the servicer or installer Other servicers and purchases and/or stocks MATV installers carry all MATV system comthe "subcontracting" ar- ponents and hardware, stall the nonservicing rangement one step relieving the retailer of retailer's showroom farther and offer retail- all aspects except the acMATV system at cost if ers a "home MATV tual effort of selling the the retailer agrees to package" which includes system to the customer. subcontract all home both parts and labor for a Home entertainment 26 ( ELECTRONIC TECHNICIAN/DEALER, MAY 1975 For more information about Simpson electronics retailers and servicers who need assistance in designing and pricing out a showroom MATV system can obtain such assistance free from most major antenna manufacturers, including Blonder - Tongue, Channel Master, Finco, Jerrold and Winegard. circle #126 on Reader Service Card. -3- ANOTHER DIMENSION has been added to the world famous family of 260 VOMS the SERIES 6XL FOR THE SPECIAL NEEDS OF THE SOLID STATE ELECTRONICS INDUSTRY Extra shock and drop -resistant construction, high impact, custom -molded panel and case Extra large viewing area with four-color (Red, Green, Blue and Black) scales, keyed to matching range panel 33 ranges with extra voltage, current, resistance and low -power ohms functions DC Volts AC Volts DC Microamperes DC Milliamperes DC Amperes AC Amperes DB Scale (1 MW 600 - all the features of the time-honored, ever popular 260-6 Resistance (Standard Power) 260-6XL, Complete with batteries, test leads and manual 260-6XLM, with mirror scale Resistance (Low Power) Plus St Reference) $90.00 $93.00 260-6XLP WITH CIRCUIT OVERLOAD -PROTECTION Reset pushbutton releases when overload exists. Will not reset until overload condition is eliminated. 260-6XLP, complete with batteries, $125.00 test leads and manual 260-6XLPM, with mirror $128.00 scale Size Weight 0-0.25; 0-1; 0-2.5; 0-10; 0-25; 0-100; 0-250; 0-500; 0-1000 0-2.5; 0-10; 0-25; 0-100; 0-250; 0-500; 0-1000; 0-50 (250 MV Drop) 0-0.5; 0-5; 0-50; 0-500 0-5 (250 MV Drop) 6 ranges from 0-5 to 0-250 with optional Model 150 Amp -Clamp adapter. -20 to + 10; -9 to + 21: -1 to +29; +11 to +41; +19 to +49 Rxl (6 St center scale), Rx100 (6002 center scae), Rx1K (6000 2 center scale), Rx1OK (60,000 St center scale) Rxl (20 2 center scale) Rx10 (200 2 center scale) Max. open circuit voltage only 100mVI Max. measuring power only 0.125 mW! 51/4 x 7 x 31/8" (133 x 178 x 79 mm) 2.5 lbs. (1.14 kg) ACCESSORIES Model 150 Amp -Clamp, Catalog No. 00532 complete with a No. 00533 test lead 30 kV DC Probe, Catalog No. 00509 Grip -Tip Extension Probe, Catalog No. 00118 Rigid Case, Catalog No. 00805 Sheath Case, Catalog No. 01818 5 kV DC Probe, Catalog No. 00506 5 kV AC Probe, Catalog No. 00505 Available Now at Leading Electronics and Electrical Equipment Distributors Write for Complete Specifications COMPANY ELECTRIC 697-2260 SIMPSON (312) 853 Dundee Avenue, Elgin, Illinois 60120 INSTRUMENTS THAT STAY ACCURATE $29.50 $22.00 $ 4.75 $20.50 $16.75 $ 5.25 $ 5.25 Telex: 72-2416 CABLE: SIMELCO IN CANADA: Bach -Simpson, Ltd., London, Ontario IN ENGLAND: Bach -Simpson (U.K.) Ltd., Wadebridge, Cornwall IN INDIA: Ruttonsha-Siimpson Private, Ltd., Vikhroli, Bombay EATT INDUSTRIES INDUSTRIAL EQUIPMENT GROUP - New In Color TV For 1975 Part 9 By Joseph Zauhar Conclusion of a series which analyzes the new and significantly changed circuits in 1975 color TV. This month we review Panasonic's all - solid state chassis equipped with the latest version of their Quintrix picture tube. Two basic chassis are employed in Panasonic's 1975 Color TV line. The chassis are completely solid state and are used in TV models with 13- to 25 - inch (diagonal) size screens. The 19 - and 25 - inch TV sets are available with the "Quatrecolor" modular chassis (ETA81, 82, and 10). Most of the circuits used in the Quatrecolor (Fig. 1) chassis closely resemble those of the original Quatrecolor chassis introduced in 1972. The basic operation of the chassis was covered in ELECTRONIC TECHNICIAN/DEALER, July 1973. The chassis employs five modules, and many will interchange between different Quatrecolor chassis, for example, the "A" Board TNP -71107, which is used for the Video IF, AFT and sound detection function, is applicable to all of the TV sets. The "B" Board TNP -71408 is used nearly on all Quatrecolor chassis. The boards are designed to snap in and out of the chassis, making component replacements simpler and faster for the service technician. 28 / Fig. 1 --Panasonic's solid state, modular "Quatrecolor" color TV chassis. Courtesy of Panasonic The brightness, con- trast and color saturation are simultaneously controlled by a "Pana Brite" control knob located on the front control panel. A "Q - Lock" circuit is used to lock the function of the color, tint, brightness and contrast controls by pressing a button on the control panel for a pleasing picture; or if you prefer, they can be adjusted manually. COLOR TV CHASSIS ETA81, 82 The ETA -81 chassis is currently used in 19 - inch (measured diagonally) TV Models CT -924 and CT -934. This chassis provides a second anode voltage of 28.5 kv. The ETA -82 chassis is used with the 25 - inch (measured diagonally) TV Models CT -2514, CT -2524, and CT-2534, and provides a picture tube second anode voltage of 30 kv. COLOR TV CHASSIS ETA -10 The ETA -10 chassis is used in the Model CT 954, which has some circuit changes to accom- modate the 19 - inch (measured diagonally), 110 degree in ture tube. ELECTRONIC TECHNICIAN/DEALER, MAY 1975 - line pic- Fig. 2-Panasonic's non - modular color Panasonic. NON -MODULAR COLOR TV CHASSIS ETA -12 The ETA -12 family of TV chassis ETA -12. Courtesy Of cations which we will now discuss. Low Voltage Power Supply chassis are employed The low voltage power with 13 - inch Models supply employed in the CT -314 and CT -324; 17 inch Model CT-714 and 19 - inch Models CT-914 and CT -974 which is equipped with remote control. The 13 - inch models provide a high voltage of 24.5 kv and the 17 - and 19 - inch models 28.5 kv. This non - modular chassis (Fig. 2) is basically quite similar to the modular chassis except for some circuit simplifi- ETA -12 offers exceptional chassis protection. A 1.5 amp fuse is placed in series with one side of the AC line and a circuit breaker in series with the other side of the AC line. To protect the chassis from transient spikes caused by lighting and other sources, a spark gap is mounted on the AC interlock socket. The chassis is R807 w...l.n ACI20V-- Oe D801 Leval Salerno Gme mon lor D801 C809. C810. 8808.0807 0805 819 .." 8804 r R812 NVv\ R814 R80 Bren rar.on colpe Jlena. O 8819 Trigger level when DC voltage is high. C810 un D806 8816 # 812 TR801 co Trigger Level when DC voltage is low. DC TR802 } SurMar0 tux n C811 Amoorter #815;78,7T- saneo T .-- are # 818 Faun Gosnor T8809, 8821,R822, 8828,C815 Gate current when DC voltage is low. Gate current when DC voltage is high. AFT Cucun B ._--- 110V Dc Anode voltage when DC voltage is low. Anode voltage when DC voltage is high. APF 0807 0810 8829,8825 4- Fig. 3-Simplified block diagram of the voltage regulating circuit employed in the ETA -12 color TV chassis. Courtesy Of Panasonic. The saw - tooth waveforms vary in form according to the level of Fig. the DC current supplied through resistor R814. Courtesy Of Panasonic. grounded through a 1.8 ohm resistor which is inserted in series with the AC power source and chassis ground. This resistor reduces surge current from being applied to the rectifiers. TR802. If the voltage across C814 drops the base current of TR8O3 drops, and the collector voltage increases. As a result, the DC voltage on the anode of D805 increases, the gate period of TR802 widens, the conducting period becomes longer, and the cathode voltage of TR801 increases. Filter capacitor C814 smoothes the output pulse of TR801. When the B+ voltage increases, the same circuit actions occur, and the B+ voltage is decreased by narrowing the gate period of TR802 and decreasing the conducting period of TR801. Variable resistor R817 stays fixed and the voltage is determined in the standard condition. Capacitor C821, C812 and resistor R815 are used to keep second video amplifier circuits. This integrated circuit TR802 cutoff. The 30 volt supply used for the power source of the stable circuit is regulated by resistors, R805, R8O6 and capacitor C817. This system produces a Voltage Regulating Circuit The function and equivalent circuit elements of the voltage regulating circuit is shown in the simplified block diagram Fig. 3. Capacitor C8O8 is used to block DC current flow. The pulsating current which is divided by resistors R904 and R807 now becomes a sine wave pulsating current formed by a high time constant integration circuit consisting of C8O9, DC level which has been superimposed with the pulsating current of about 4 volts p -p 'increases gradually, as shown in Fig. 4, the trig- gering time is short when the DC level is low, and becomes long when the DC level is high. To detect voltage fluctua- tions and amplify them, the voltage is divided by resistors R816, R817, and R818. Resistor R817 supplies the triggering voltage for TR803, this voltage is then compared with the six - volt reference voltage. When the base voltage of TR8O3 in- creases, the collector voltage drops, and vice versa. When the trigger pulse R8O8 and C10. DC volt- is applied to the gate, it age is superimposed by causes current flow from resistors R813 and R814 the anode to the cathode with the pulsating cur- and thyristor TR802 is rent to obtain an AC abruptly discharged to waveform of 4 volts p -p approximately the six without a triggering volt reference voltage. pulse from D8O5. When TR802 is turned Diode D805 is used to off, charging takes place determine the gate pulse through C811, from the trigger level to turn on 30 - volt power source thyristor TR8O2. The side. As a result, a saw cathode side of the tooth waveform shown in thyristor is previously Fig. 4 appears varying in set at a reference voltage form according to the of six volts by zener diode level of the DC current D806. When the gate supplied through R814. input voltage exceeds An inverted - sign wave this reference voltage, appears at resistor R812 TR802 turns on. If the on the cathode side of receives chroma band signals from the Color Processing IC601, Type AN289 and delayed luminance video signal from the Video Processing IC151 Type AN331. The color processing amplifier also supplies a reference color subcarrier signal to the color demodulator in IC602. The color difference signals received from IC6O2, drive the bases of the R, G, B output transistors TR351, TR352 and TR353. The luminance signal received from IC6O2 is fed through the video output emitter follower transistor, TR601, to the emitters of transistors TR351, TR352 and TR353. maximum of 120 volts peak RGB drive to the picture tube for 1 volt peak at the picture detector input to IC 151. As compared to the Video System Quatrecolor chassis, the The video circuits non - modular chassis deemployed in the ETA -12 sign eliminates one IC chassis (Fig. 5) are and two transistors simplified by using an without a noticeable loss integrated circuit, of performance. AlIC602, Type AN343, for though a ringing type of the chroma demodulator, 3.58 MHz crystal oscilcolor difference and the lator is used for the non MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 29 Fig. 5-Simplified block diagram showing the signal path of the video system. Courtesy Of Panasonic. TNP659 3 I P1" Fig. 6-Schematic diagram showing the ABL and high voltage outpu circuit used in the ETA -12 color TV chassis. Courtesy Of Panasonic. ZAJ 1 ll4M / 1alruP F 0- PIX TUBE C 510FLB22 a> 510CEB22 ú04 1510TRB221 -el --- 33N"3375 'z SiA YW !FV I)96 ,1::3^4 337rLOr rTirñ 31P5?^.,' ,i, rii 31 z11 -,Y,.,, -1?'¿r-1T:rw: '¡ÿ °T..ri'pi.rfiii`' raz FSM 4 IOP1 1 II Yi 2-> 710n;5W r1 Isou) ISdJ£i V Pa3 11313 37em 2^P. C0' PTSCRee1 rñ 1~ toy./ 3516 rñ ri1 1TC39y.s-n-`-1°3e9p4 rtrP: IÓ61, L4Vr 3V9 1001 IOuM1 iW V SÇREEN YS mi Fig. modular chassis, equiva- voltage is obtained lent performance has through the tripler (Fig. been achieved. 6) which rectifies the The overall luminance horizontal output pulse video response is shaped received from the high for approximately 6 dB of voltage winding of the peaking at 1.5 MHz, fall- flyback transformer. ing to about -3 dB at 2.8 This transformer is MHz. The horizontal res- tuned to the fifth higher olution is better than 250 harmonic wave by C518 lines and the apparent and variable coil L506, sharpness is enhanced by stabilizing the high voltapplication of the ap- age pulse. The focus dipropriate overshoot or vider consists of resistors pre - shoot in the delay R4, R5, R6, and Focus line or video amplifier. Adjustment control Horizontal blanking is R537. The variable achieved by applying a range of R537 can be alshaped horizontal output tered by connecting the transformer pulse to the focus grid wire to Point A second video amplifier in or B. Resistors R2 and R3 IC602 and a vertical out- are used to minimize the put pulse blanks the high voltage regulation video output emitter fol- to the low beam current lower transistor TR601 and Rl is used to correct during vertical retrace. partial distortion of picture caused by incomHigh Voltage Output Circuit plete DC high voltage filThe picture tube sec- tering when a sudden ond anode accelerating change in beam current occurs. YS /^^r 14311 `Mo > ",13, zY.", R G.SCREENJ Yö ELECTRONIC TECHNICIAN/DEALER, MAY 1975 5 ÿrrfi [B Fig. 7-Circuitry employed in color TV chassis using the new Quintrix pentode picture tube. Courtesy Of Panasonic. 30 / I) [M7(3 2Me, [93tkËEm w-sëRN W91 11379 ft)1l W 3 `377 J rfr SCREEN YD !COY' 8-Circuitry employed in color TV chassis using the regular tetrode picture tube. Courtesy Of Panasonic. Depending on the pic- ture tube current, not only the horizontal out- put sustain electrical loss, but the picture tube dance path becuase of D509, whereas, for the negative pulse, it increases in impedance. When there is maximum beam current, the bias current of the second video amplifier input base is put into the negative going direction through R533, to reduce beam current. Resistor R310 is the ABL Setting control which adjusts the positive current from the 160 volt line to set the amount of beam current. itself deteriorates in purity which is caused by heating of the shadow mask. For these reasons and for sufficiency in X ray radiation, it is necessary to restrict the current applied to the picture tube. As the anode current increases; high - frequency current flows Diode D502 is a device through the high voltage which protects the adjawinding of the horizontal cent circuit elements output transformer. from damage if the high Proportional current voltage anode comes in flows through R531, contact with chassis R538, R533, R310, R311 which are connected to the flyback at terminal 6, as if to compensate for the loss of energy. The positive going pulse has a low impe- ground. Quintrix Picture Tube The "Quintrix" color picture tube is employed on all 13 - inch 17 - and continued on page 42 Quasar's back-up programs are designed to help our thousands of authorized servicers koop their customers happy We design Quasar TV serviceability with you in mind. Our own service experts are, in fact, involved in design at the drawing board stage. Their contributions help you perform your job more professionally to help enhance your image with consumers. Such keen awareness of your needs helped lead to our pioneering in modular chassis concepts. Our regular, practical training helps keep you up to date. Quasar's 83 distributors conduct thorough training seminars regularly to acquaint servicers with newly -introduced products and to pass along updated servicing techniques. Quasar even provides practical, valuable service literature regularly for a nominal subscription fee. Our speedy PACE parts availability system helps you maintain customer good will. To help you satisfy most consumer problems promptly, yet help keep your shop inventory reasonable, Quasar offers its PACE program through distributors. Using this optional program, the distributor can stock 90% of all parts you'll ever need. Beyond that, we'll drop -ship through our distributors from the factory direct to you. A new company with new solutions For today. QuasarElec-ronics Corporation A subsidiary of Matsushita Electric Corporation of America MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 31 TECH BOOK DIGEST Condensed from a single chapter of a recently introduced TAB book, by permission of TAB BOOKS, Blue Ridge Summit, Pa. 17214 Understanding Scope Specs Part 2 Fig. 9-"Rise time" is the time it takes the leading edge of a square wave to rise from 10 percent to 90 percent of its maximum amplitide. In Part 1, AC and DC coupling and vertical amplifier bandwidth pends on this characteristic. For precision in dewere discussed, followed scribing the steepness of by an introduction to ver- the leading edge of a tical amplifier rise time. pulse such as a square Part 2 begins with a re- wave, it is desirable to be view of the meaning of able to express the steeprise time and continues ness in numbers. This with an explanation of need leads us to the conthe effects of rise time cept of the rise time of a and how it is measured, wave, defined as the time followed by analyses of required for the leading an amplifier or other device is determined using a square wave whose rise time is even less than the rise time of the amplifier or other device being tested. One thing of interest for our purposes here is the effect upon rise 10 percent of the peak value to 90 percent of the peak value. This is illustrated in Fig. 9. Although the above definition is the generally accepted one, rise time is occasionally taken as the time required for the leading edge to rise from 5 percent of the peak value to 95 percent of the peak value. However, if this or any other definition other than the one given in the preceding paragraph is intended, the intended definition is given along with the rise time. The rise time of a device that transmits waveforms or displays them is taken as the rise time of the displayed waveform resulting from a theoretically perfect square - wave input. A perfect square wave is impossible to obtain in practice, of course. In practice, the rise time of more devices in cascade, or series. Suppose that device a has a rise time Tra, and device b has a rise time, Trb. If a theoret- horizontal amplifier edge to rise from characteristics and vertical amplifier sensitivity, accuracy and input impedance. RISE TIME (TRANSIENT RESPONSE) For an amplifier to faithfully reproduce pulses with steep leading edges, the amplifier must permit a very rapid rise in voltage. In a vertical amplifier, this allows the CRT beam to deflect very rapidly and to follow the nearly vertical edge of a steep pulse. This characteristic of the vertical amplifier is known variously as rise time, transient response, and time response. It is expressed by a number that is actually an interval of time. Before the rise time, or transient response, of a vertical amplifier can be well understood, it is necessary to understand the steep - sided pulses whose observation de- (From Chapter 7, UNDERSTANDING & USING THE OSCILLOSCOPE, By Clayton Hallmark, TAB BOOKS, Copyright 1973. A review of the complete book follows this article.) 32 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 time when a theoretically perfect square wave is passed through two or ically perfect square wave were fed into the two devices in cascade, the rise time Tra of the output wave should be Tra2 + Trb2 thus the rise time of the cascade combination of devices a and b. For example, if a perfect square wave were fed into an amplifier having a rise time of 3 microsec, and if the output of this amplifier were fed into another amplifier having a rise time of 4 microsec, the rise time of the output Tr would be about 5 Tr = Tr is given for Tr, we can find how good an amplifier or scope must be to achieve this result. For example, Fig. 10 shows that if we wanted to observe the rise time of a waveform whose rise time is 0.04 microsec, we would need a scope whose rise time is not more than 0.01 microsec if the error in the rise - time observation is to be kept to less than 3 percent. Ideally, a scope should have a vertical system capable of rising in about one - fifth the time that the fastest (steepest) signal rises. In such a case, Fig. 10 shows that the rise time of the signal (as displayed on the scope) will only be in error by about 2 percent. Vertical systems having a rise time no better than equal to the rise time of the fastest signal to be observed are often considered adequate. Whether they are or not depends on the accuracy required. In any case, when the rise time of the scope is known, the rise time of microsec. the signal can be calcuNow, suppose we want lated from the rise time to amplify or display a measured on the screen certain waveform, and using the formula suppose further that we -T2 Ts,; want the rise time of the in which Ts is the actual output or displayed signal rise time, Ti is the waveform to be the same indicated rise time, and as that of the input T. is the scope rise time. waveform, within some The accuracy with which specific tolerance. Using the rise time can be calthe chart in Fig. 10, culated decreases which was constructed sharply for signals that according to the formula rise faster than the verti - w K 7 i more important charac- % II-n"11 uiuuus.uu 13 tt ERROR, 2 7 4 S 6 7 6 910 13 20 30 111311 uuu's...1.._ =fififtf= ttti uuniiiiiiii=49T1ii Miaffl //11111111111111111111111111111111111111111111B Fig. 10- The percent by which the output or displayed rise time exceeds the input signal rise time depends on the ratio of the amplifier or scope rise time to the input signal rise time. Fig. 11-To avoid overshoot and ringing, the product of rise time and the upper 3 dB frequency should be between .33 and .35. cal system, because of the sweep is relatively slow increased importance of compared to the vertical measurement errors. To illustrate, the following sweep - timing or display reading errors will cause the calculated rise time to be in error by as much as 100 percent. When To/Ts = 2/1;11 percent will cause a 100 system rise time, the leading edge of the displayed waveform will be steep, and the measurement will be confined to a small portion of the screen. Under these circumstances, the accuracy with which the discalculation play can be measured is percent reduced, and the accuerror. When To/Ts = 3/1;5 racy with which the rise percent will cause a 100 time of the signal can be calculation calculated is greatly repercent duced. error. When To/Ts = 4/1;3 Fortunately, very acpercent will cause a 100 curate rise time meacalculation surements are not repercent quired as often as rise error. When To/Ts = 5/1;2 time comparisons. For percent will cause a 100 comparing the rise time percent calculation of two signals, a scope error. rise time no better than Thus, if the scope rise the rise time of the signtime is 5 times the signal als is usually adequate. The rise time and rise time, an error of only 2 percent in sweep tim- high - frequency reing or display reading sponse of scopes are two will result in a 100 per- of the most important cent error in the calcu- scope characteristics, and they are closely related rise time. When the fastest lated. Rise time is the 35 nsec (35 x 10 °sec). a scope can display teristic for "faster" Such with a rise waveform a scopes, and bandwidth is of 5 x 35 nsec, or 175 the more important one time nsec, with a rise - time for "slower" scopes. The accuracy of 2 percent. Or, product of rise time and it can display a waveform frequency should pro- with a rise time of 3x 35 duce a number whose nsec, or 105 nsec, with a value lies between 0.33 rise - time accuracy of 5 and 0.35, if the scope is to percent. (See Fig. 10). display fast - rising signHORIZONTAL AMPLIFIER als without overshoot or CHARACTERISTICS ringing. Overshoot, as illustrated in Fig. 11, is an Horizontal amplifiers excessive initial re- are generally similar to sponse to a pulse signal. vertical amplifiers, and It is seen in a scope dis- in some cases are nearly play as a peaking of the identical. However, the leading edge of a pulse. performance requireRinging is a damped os- ments for horizontal amcillation occurring in a plifiers are not as stringsignal as a result of an ent as those for vertical abrupt changing the amplifiers. The waveforms genersignal. This defect in a pulse is also illustrated ated by the time - base (horizontal sweep) genin Fig.11. To illustrate the com- erator make less demand putation of the product of on the horizontal amplirise time and frequency fier than signals that response, the product of may be applied to the 0.023 microsec rise time vertical amplifier make and 15 MHz frequency is on it. As a result, the 0.023 x 10-6x 15 x 10-6 = bandwidth of the hori0.023 x 15 = 0.345. Since zontal amplifier may be for optimum transient about a third the bandresponse the product width of the vertical amshould be between 0.33 plifier: Besides vertical amand 0.35, a scope with the response, another exemplary characteris- plifier factor that limits the tics will have optium maximum presentable transient response; that frequency of a scope is is, it will reproduce steep sweep speed. Since 1 MHz signal waveforms with- has a period of 1 microsec out significant overshoot and 10 MHz has a period or ringing. A factor of 0.1 microsec, in order larger than 0.35 would to display a single 10 indicate overshoot grea- MHz waveform on the ter than 2 percent, and a screen, the sweep must 0.1 microsec to span factor larger than 0.4 take trace. If it takes the would indicate overshoot longer, more than one greater than 5 percent. waveform will be disYou can calculate the played. A 10 MHz scope rise time of your scope if having a 1 microsec you know the upper 3 - sweep means that you dB - down frequency of will see 10 waveforms on the scope, using the equ- the sweep. The sweep speeds of most triggered _K ation sweep scopes are set by a Tr = B calibrated control at so where K is 0.35, for an many seconds or miovershoot of less than 3 croseconds per division. percent, and B is the The smaller the number, upper frequency limit. the faster the sweep and For example, if the scope the higher the frequency response is 10 MHz at the that can be displayed as a minus 3 dB point, the rise single waveform. Many time is 0.035 microsec or scopes are provided with MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 33 An Extraordinary Offer to introduce you to the benefits of Membership in ELECTRONICS BOOK CLUB for THIS GIANT 348 -Page a limited time only you can obtain Color TV Trouble Factbook forIt only WITH TRIAL MEMBER- SHIP we send you this helpful new book as described on the facing page as part of an unusual offer of a Trial Membership in Electronics Book Club ? This is a quality hardbound volume, especially designed to help you increase your know-how, earning power, and enjoyment of electronics. This handsome, hardbound book is indicative of the many other fine offerings made to Members important books to read and keep volumes with your specialized interests in mind. Whatever your interest in electronics -radio and TV servicing, audio and hi-fi, industrial electronics, communications, engineering -you will find Electronics Book Club will help you. With the Club providing you with top quality books, you may broaden your knowledge and skills to build your income and increase your understanding of electronics, too. May ...... How You Profit from Club Membership This special offer is just a sample of the help and generous savings the Club offers you. For here is a Club devoted exclusively to seeking out only those titles of direct interest to you. Membership in the Club offers you several advantages. 1. Charter Bonus: Take "COLOR TV TROUBLE FACTBOOK" publisher's list price $8.95. . for only 49¢ with your Trial Membership. 2. Guaranteed Savings: The Club guarantees to save you 15% to 75% on all books offered. 3. Continuing Bonus: If you continue after this trial Membership, you will earn a Dividend Certificate for every book you purchase. Three Certificates, plus payment of the nominal sum of $1.99, will entitle you to a valuable Book Dividend which you may choose from a special list provided members. 4. Wide Selection: Members are annually offered over 50 authoritative, new books on all phases of electronics. ... Bonus Books: If you continue in the Club after fulfilling your Trial 5. Membership, you will receive a Bonus Dividend Certificate with each additional Club Selection you purchase. For the small charge of only $1.99, plus three (3) Certificates, you may select a book of your choice from a special list of quality books periodically sent to Members. 6. Prevents You from Missing New Books: The Club's FREE monthly News gives you advance notice of important new books books vital to your continued advancement. This extraordinary offer is intended to prove to you, through your own experience, that these very real advantages can be yours . . that it is possible to keep up with the literature published in your areas of interest and to save substantially while so doing. mail the postage-paid airmail card today. You will receive "COLOR TV TROUBLE FACTBOOK" for 10 -day inspection. 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Here, then, is an interesting opportunity to enroll on a trial basis to prove to yourself, in a short time, the advantages of belonging to Electronics Book Club. We urge you, if this unique offer is appealing, to act promptly, for we've reserved only a limited number of books for new Members. To start your Membership on these attractive terms, simply fill out and ... SEND N O MONEY! Simplyfill in and mail postage -paid Airmail card today! p 9 p Y S,Na. (OLOR TV 719 .. TV R 0 0 TROUBLE B0ToK . tion Sou lhmu/ , s,&ic FrBYthi°11Editgr5 Problems & Solutions 348 pages 402 illustrations Handsome, hardbound volume Partial List of Contents Admiral-Chassis 11A9N; G11; G13; H10; 14H12; K10; 4K10; K15; K16; K17; K18; K19; K20; 12K20; M20; H12; 4H12; 53776AN. Canadian General Electric-Chassis M663; M678; M679. Dumont-Chassis 120957; 958 Emerson-Chassis K17; K18; K20; M20. Electric-Chassis CB; CD; Cl; C2; Gl; H; HE; H1; H3; JA; KC; KC KD; KE; LB; L1; L2; MA; N1; N2; P; Ul. General The most comprehensive single "all -makes" guide to color TV troubles and solutions ever published . . . NEW, completely revised and enlarged 2nd Edition! This book should be considered a "must" for every practicing professional TV service specialist ... the information it contains may easily save you hours of time repairing a "toughdog" color TV. Partial schematics, location diagrams, chassis layouts, and sketches are included as necessary to make every entry easy to understand and simple to implement in the field. To our knowledge, no other single volume contains so much easy -to -find information about so many individual models and brands of color receivers. A complete cross-reference index is ly find In all, size of the bestselling this newly updated edition is a fully indexed all -in -one reference guide to color -set troubles and recommended solutions, manufacturers' service notes, and production change data-all alpha -numerically arranged by manufacturer and model. This low-cost handbook contains service tips, troubleshooting data, and special problem -solving aids for all the more popular U.S. and Canadian color TV makes and models, from A (Admiral) to Z (Zenith). ,,..+ .,111 Tealn.ln.l olon orn + the Twice original, tided. n '=óti~o0y ó`apu ááac Unprecedented óGavacCiÿv Offer! 1 COLOR TV FAOO W W 1-3 Ó ÿ. a íu. ñ .ult-tocolor to will :8 pps., grams. $8.95. C a y a c d' o puy ° mE. , a C>wÁúab aa>`KF.aaiC Fo.F oáZ úP: 443( aaiÿ m d.4ó V p,ÑQ óóNá Ou d '-"ä; 0 Ñ L .beg mba,.r Eo-A F1 .5 á 6 E+uE d-+ E oú w,dóu Q)o^po=7 i. an^Ei'd° Your Membership in the Electronics Book Club brings you the most important, authoritative books on electronics ... at substantial savings. Read the details of this unique offer! 3 a d),c§ S mGa,G% mpCo opa+oyc+ C, d a e ca -ae a`tl MAIL THIS MEMBERSHIP CARD TODAY! w Ew.º o..°,..W° make rstand. á áóEHu.eo áiçd dÇE,,, opp ó poó`" dÿ ÿx c := ca E n'>oEdoEP,.má with Trial Membership in the Club NO STAMP NEEDED - SEND NO MONEY o trou - Ind re- ° mm p°10uaúWCF°1'%d TROUBLE FACTBOOK for only za .-, V Ñ +- ; Z ra GÚdóal~m G4 O F oW F . p 2 ß~ u,do xa 0 Accept This GIANT 348 -page COLOR TV TROUBLE t soloY9 a .a e áG z cs E O r-a e Ent o. some form of expansion for even faster sweep speed, making more detailed examination of fast signals possible. In order to examine SCOPE 6K one particular part of a waveform, there are two different methods. One is to increase the horizontal gain so that the pattern goes off the screen at both sides, and the trace is thus expanded. Another method, to be discussed further in a later chapter, is to delay the sweep trigger and to use a very fast sweep. This method, calibrated sweep delay, has a number of advantages, but it increases the cost of the scope. The overall speed of response of a scope depends on both sweep speed and on rise time. A figure of merit rating that can be used to express the overall response speed of a scope is the ratio of the vertical system rise time to the time - per - division of the fastest sweep. Sweep speed is usually continuously adjustable over the total range of the sweep speeds. Usually, continuous coverage between the lowest and highest speeds is provided by a step - type range control, which clicks in at definite speeds, and by a vernier control, which permits continuous coverage between the speeds selectable by the range switch. The vernier sweep time - per - division may or may not be calibrated. This control allows us to spread or compress a waveform so that it occupies a certain desired number of graticule divisions, as might be desired for making phase measurements. The control is even more useful if it is calibrated, since cali- brated sweep allows frac- tional time measure- ments to be made without using subdivisions of the graticule scale. VERTICAL SENSITIVITY This characteristic is related to the deflection sensitivity of the CRT 38 / 6 3V VIN íK GND Fig. 12-Test setup for determining scope sensitivity. 13-The input inpedance of the vertical amplifier of a scope consists of paralled resistance and capacitance. Fig. and to the gain of the vertical amplifier. The deflection sensitivity is the amount of deflection caused by 1v applied to the deflection plates. This is an inherent characteristic of the CRT, and for most tubes is about 0.1 cm per volt. In other words, 1 v on the deflection plates produces 0.1 cm of CRT beam deflection. The deflection sensitivity of the CRT limits the minimum and maximum signals Fig. 14-A passive probe can improve the input impedance of a scope. vider to the vertical steps. Since division - per - input of the scope to be volt terminology usually checked. 2) Set the vertical atrequires calculation for that can be measured. practical observations, tenuator and vertical Also, the deflection sen- vertical deflection sen- gain controls for maxsitivity limits practical sitivity is usually ex- imum vertical gain. Addirect measurements to 1v minimal signal, since smaller signals would cause a display amplitude even less than 0.1 cm. Deflection sensitivity and screen size also fix the maximum measurable level. If the voltage at the deflection plates times the deflection sensitivity is greater than the screen size permits, the beam will be deflected off screen. Inserting a probe and an amplifier between the signal source and the vertical deflection plates increases deflection sensitivity and isolates the signal source and the CRT. This vertical deflection system, by including an amplifier, implies voltage gain. Vertical amplifiers increase deflection sensitivity. They increase the deflection that a signal voltage can cause. Also, the amplifiers contain calibrated step control of gain and attenuation, thereby extending input deflection sensitivity from, perhaps, 0.04 div /v to 100 div/v in several ELECTRONIC TECHNICIAN/DEALER, MAY 1975 pressed in terms of just voltage divider level deflection factor. De- control R for a signal givflection factor is the ing 1 cm of vertical deinverse of deflection sensitivity, and is expressed flection on the CRT. 3) Open switch S and measure the resistances Rab and Rbc. Substitute the measured resistances in the formula: my per cm, sensitivity in volts per division. Here's an example: If a CRT has a deflection sensitivity of 0.1 cm per volt, it has a deflection factor of 10 volts per cm. If the amplifier has a gain of Rab x 6.3 x 2.828 x 103 1000, the vertical deflec- Rix tion sensitivity will be VERTICAL ACCURACY increased to 100 cm per volt, and the deflection Vertical accuracy is a factor, the sensitivity of measure of the distortion the scope itself, will be produced in the vertical 0.01 volt per cm, or 10 m deflection system, and is v per cm. stated as a percentage. If If the specs for a scope a scope has a vertical acgive the vertical sensitiv- curacy of 3 percent ity as 10 m v per cm, this very good accuracy, by means that an applied the way then once the signal of 10 m v at the scope is calibrated, it vertical input terminals should be possible to will produce a 1 cm verti- measure voltages with cal deflection with the an accuracy of 3 percent vertical gain turned all or better. If, for example, the way up. a scope with a vertical If you do not know the accuracy of 3 percent is vertical sensitivity of calibrated for 20v per your scope, you can de- div, a deflection of 5 div termine it by use of the will indicate an amfollowing procedure. plitude no less than 97v 1) Connect the circuit and no greater than of Fig. 12, connecting the 103v. The accuracy of output of the voltage di- good modern scopes var - - -a (TR%OuRBITEV ....---` 18IBLtV B.sCT t,on. FA Svu 43 Probms &'C FA(TBOOK Problems & Solutions 348 pages 402 illustrations Handsome, hardbound volume Partial List of Contents H12; 41-112; 14H12; K10; 4K10; K15; K16; K17; K18; K19; K20; 12K20; M20; S3776AN. Canadian General Electric-Chassis M663; M678; M679. Dumont-Chassis 120957; 958 Emerson-Chassis K17; K18; K20; M20. General Electric-Chassis CB; CD; Cl; C2; G1; H; HE; H1; H3; JA; KC; KC KD; KE; LB; L1; L2; MA; N1; N2; P; U1. T918; T919; 1920; T924; T935; T936; T938; T939; 1947; T950; 1951; T952; 1958; T962; 1962.10; 1974; & 45; 1931; T940; 1956; 1979; T911; 1933; T946; T957; T989. MGA-Chassis T50. Motorola-Chassis 16; 1921; TS908; TS - 914; TS915; TS918; TS924; TS929; 18; TS929; TS931; TS934; TS938. Olympic-Chassis CT400; CT910; CT911; CTC19; CTC20; CTC21; CTC30; CTC31. Philco-Chassis 16M91; QT85. Philco-Ford-Chassis 3CS90; 3CS91; 3CY90; 3CY91; 20KT40; 20KT41; 15M91; 16M91; 17MT80A; 16NT82; 16QT85; 18QT85; 20QT; 20QT88. RCA-Chassis CTC21; CTC39; CTC44; CTC50; CTC59; size of the bestselling this newly updated edition is a fully indexed all -in-one reference guide to color -set troubles and recommended solutions, manufacturers' service notes, and production change data-all alpha -numerically arranged by manufacturer and model. This low-cost handbook contains service tips, troubleshooting data, and special problem -solving aids for all the more popular U.S. and Canadian color TV makes and models, from A (Admiral) to Z (Zenith). But that's not all! Included also are details concerning repetitive troubles, field -factory changes, new and unusual circuits and descriptions of how they work, special adjustment procedures and other such pertinent service information. Of particular importance are the manufacturer's production changes -this book includes a detailed accounting of such changes where they might logically affect set performance and where the technician might replace a "factory" component with an unsuitable substitute. the Twice original, Admiral-Chassis 11A9N; G11; G13; H10; Magnavox-Chassis T38; 1904 The most comprehensive single "all -makes" guide to color TV troubles and solutions ever published . . . NEW, completely revised and enlarged 2nd Edition! This book should be considered a "must" for every practicing professional TV service specialist ... the information it contains may easily save you hours of time repairing a "tough dog" color TV. Partial schematics, location diagrams, chassis layouts, and sketches are included as necessary to make every entry easy to understand and simple to implement in the field. To our knowledge, no other single volume contains so much easy -to-find information about so many individual models and brands of color receivers. A complete cross-reference index is provided to enable you to quickly find the specific material you need. In all, over 600 specific items are included. The material provides instant solutions to many color TV circuit troubles, enabling you to diagnose and repair hundreds of otherwise difficult -to solve problems. If you service color TVs, this organized file of data will pay for itself time and again. 348 pps., hundreds of schematics and diagrams. Hardbound. Publisher's list price $8.95. 14M91; 18MT70; 18QT86; CTC17; CTC17X; CTC22; CTC30; CTC36; CTC40; CTC41; CTC42; CTC46; CTC47; CTC48; CTC51; CTC52; CTC54; CTC63; XL -100. CTC20; CTC38; CTC43; CTC49; CTC55; Sylvania-Chassis D01; D02; D06; D07; 008; D10; D12; D12-09-09; 012.11-06; D12-15-07; D12-20-50; 012-21-50; D14; D15; D16; E02-1, 2. Truetone-Chassis 2DC4815. Westinghouse-Chassis V2655; V2656; V- 8001 Zenith-Chassis 12A13C52; 14A9C51; 19- DC12; 19DC22; 19DC28; 25DC57; 20X138. make Literally hundreds of complete and partial schematics and illustrations each of the over 600 entries in "Color TV Trouble Factbook" easy to understand. AN EXTRAORDINARY OFFER... ...for more details circle 104 on Reader Service Card some form of expansion for even faster sweep speed, making more de- tailed examination of OPE fast signals possible. In order to examine N one particular part of a waveform, there are two different methods. One is to increase the horizontal gain so that the pattern goes off the screen at both sides, and the trace is thus expanded. Another method, to be discussed further in a later chapter, is to delay the sweep trigger and to use a very fast sweep. This method, calibrated sweep delay, has a number of advantages, but it increases the cost of the scope. The overall speed of response of a scope depends on both sweep speed and on rise time. A figure of merit rating that can be used to express the overall response speed of a scope is the ratio of the vertical system rise time to the time - per - division of the fastest sweep. Sweep speed is usually continuously adjustable over the total range of the sweep speeds. Usually, continuous coverage between the lowest and highest speeds is provided by a step - type range control, which clicks in at definite speeds, and by a vernier Fig. 12-Test setup for determining scope sensitivity. and to the gain of the vertical amplifier. The deflection sensitivity is the amount of deflection caused by 1v applied to the deflection plates. This is an inherent characteristic of the CRT, and for most tubes is about 0.1 cm per volt. In other words, 1 v on the deflection plates produces 0.1 cm of CRT beam deflection. The deflection sensitivity of the CRT limits the minimum and maximum signals that can be measured. Also, the deflection sensitivity limits practical direct measurements to 1v minimal signal, since smaller signals would cause a display amplitude even less than 0.1 cm. Deflection sensitivity and screen size also fix the maximum measurable level. If the voltage at the deflection plates times the deflection sensitivity is greater than the screen size permits, the beam will be de- control, which permits continuous coverage between the speeds selectable by the range switch. The vernier sweep - flected off screen. time - per - division may Inserting a probe and or may not be calibrated. an amplifier between the This control allows us to signal source and the spread or compress a vertical deflection plates waveform so that it oc- increases deflection sencupies a certain desired sitivity and isolates the number of graticule divi- signal source and the sions, as might be desired CRT. This vertical defor making phase mea- flection system, by insurements. The control is cluding an amplifier, imeven more useful if it is plies voltage gain. Verticalibrated, since cali- cal amplifiers increase brated sweep allows frac- deflection sensitivity. tional time measure- They increase the deflecments to be made with- tion that a signal voltage out using subdivisions of can cause. Also, the amthe graticule scale. plifiers contain calibrated step control of gain VERTICAL SENSITIVITY and attenuation, thereby extending input deflecThis characteristic is tion sensitivity from, related to the deflection perhaps, 0.04 div iv to sensitivity of the CRT 100 div/v in several 38 / 13-The input inpedance of the vertical amplifier of a scope consists of paralled resistance and capacitance. Fig. ELECTRONIC TECHNICIAN/DEALER, MAY 1975 Fig. 14-A passive probe can improve the Input impedance of a scope steps. Since division - per volt terminology usually requires calculation for vider to the vertical input of the scope to be checked. 2) Set the vertical at- tenuator and vertical practical observations, vertical deflection sensitivity is usually expressed in terms of deflection factor. Deflection factor is the just voltage divider level in volts per division. Here's an example: If a CRT has a deflection sensitivity of 0.1 cm per volt, it has a deflection factor of 10 volts per cm. If the amplifier has a gain of 1000, the vertical deflection sensitivity will be increased to 100 cm per volt, and the deflection factor, the sensitivity of the scope itself, will be 0.01 volt per cm, or 10 m R,bx6.3x2.828x103 inverse of deflection sensitivity, and is expressed v per cm. If the specs for a scope give the vertical sensitivity as 10 m v per cm, this means that an applied signal of 10 m v at the vertical input terminals will produce a 1 cm vertical deflection with the vertical gain turned all the way up. If you do not know the vertical sensitivity of your scope, you can determine it by use of the gain controls for maximum vertical gain. Ad- control R for a signal giving 1 cm of vertical deflection on the CRT. 3) Open switch S and measure the resistances Rab and Rbc. Substitute the measured resistances in the formula: my per cm, sensitivity Rbc VERTICAL ACCURACY Vertical accuracy is a measure of the distortion produced in the vertical deflection system, and is stated as a percentage. If a scope has a vertical accuracy of 3 percent very good accuracy, by the way then once the scope is calibrated, it should be possible to measure voltages with an accuracy of 3 percent or better. If, for example, a scope with a vertical accuracy of 3 percent is calibrated for 20v per div, a deflection of 5 div will indicate an amplitude no less than 97v - -a following procedure. 1) Connect the circuit and no greater than of Fig. 12, connecting the 103v. The accuracy of output of the voltage di- good modern scopes var- ies between about 2 and 5 percent. In general, the more expensive the scope, the greater the ac- curacy. HORIZONTAL ACCURACY In addition to the accuracy of the vertical deflection system, we are also concerned with the accuracy of the time base. This is specified in terms of the maximum error in the timing of the sweep over the full width of the sweep, for any calibrated sweep. A calibrated sweep is one selected with a sweep kinds of sweep non - linearity, and several of them may be present in the same scope. The most common involves slow- ness at the beginning and end of the sweep, with the fastest sweep rate occurring near the center of the sweep. Since there is no generally ac- cepted way of specifying linearity, it is not included in the specifications of a scope. VERTICAL INPUT IMPEDANCE The input impedance frequency control that to the vertical amplifier gives a direct reading in can be simulated by a time units. Depending on high resistance shunted scope type and manufac- by a small capacitance, turer, calibrated ranges as in Fig. 13. Since are available between a capacitive reactance var- range minimum of 1 ns per cm, and a range maximum of 1 microsec per cm to 5 sec per cm. If the time - base accuracy is specified as 3 percent, for example, the time required to make a full horizontal sweep should not be less than 97 percent nor more than 103 percent of the time indicated by the sweep speed setting. If, then, the sweep speed is set at 1 microsec per cm, and if the full - scale sweep is 10 cm, a 3 percent time base accuracy means that the sweep may cover the full - scale distance in as little as 9.7 microsec, or as much as 10.3 microsec. Time - base accuracy is important when accurate time measurements are to be made. It is also important to make a distinction between time - base accuracy and sweep linearity, to which time - base accuracy is related. Time base accuracy is highly dependent on sweep linearity. However, basing the accuracy on the full - scale sweep has the effect of averaging the various rates of horizontal sweep that may occur during one complete sweep. There are various ies with frequency, in order for the impedance spec to hold for all frequencies, it is expressed in terms of resistance and capacitance, rather than in terms of resis- tance and capacitive reactance. It may be referred to by such names as input RC, and input time constant. The resistive part of the spec is typically 1 megohm, and the capacitive part is typically 15 to 50 pF. In some applications, even this high resistance and small capacitance may produce undesirable loading of the circuit whose waveforms are being observed. In other words, the loading can cause different waveforms to be displayed than would exist with the scope disconnected, and thus can give a mislead- ing presentation. To minimize this loading, a passive probe, that is, one containing no am- plifying device, may be used with the scope. Such a passive probe may consist of a parallel resistor and capacitor, as in Fig. 14. The result of using the probe is that there is connected to the circuit being investigated a new effective loading capaci- tance smaller than the various types of probes original capacitance and commonly used by sera new effective loading vice technicians. resistance larger than Chapters 5 and 6 outthe original resistance. line the setup, calibraThus the loading effect of tion and specific applicathe vertical input circuit is reduced through the tions of a triggered use of a probe, and the sweep scope which is repinput resistance might resentative of those abe increased to 10 vailable to and typically megohms, say, and the used by service technicapacitance might be de- cians. creased to perhaps 10 Chapter 7 thoroughly pF. explains the specifications which a technician TECH BOOK REVIEW must consider when selecting a scope to fit his Understanding & Using particular needs. The Oscilloscope The special features and applications of dual (TAB BOOK NO. 644) trace, dual - beam, storAuthor: Clayton Hall- age, sampling and other mark "advanced" types of Price: $7.95 Hardbound scopes are described in $4.95 Paperback Chapter 8. CRT - equipPublished: July, 1973 ped special - purpose test Size: 272 pages instruments such as An authoritative, spectrum analyzers, encomprehensive source of gine analyzers, vector technician - oriented in- scopes and semiconducformation about the cir- tor curve tracers are excuit theory, features, amined in Chapter 9. specifications, operating The final chapter disprocedures and applica- cusses relatively untions of simple and ad- common yet simple apvanced oscilloscopes. plications of scopes. Chaper 1 describes the These include strain composition of sine and gage measurements, complex waveforms typi- production testing, time cally encountered by ser- domain reflectometry vice technicians. Chap- and CRT screen phototer 2 describes the physi- graphy. cal and electrical design Well written and proof the CRT and the fusely illustrated, this fundamentals of scope text is must reading for deflection and time - base any service technician circuits. who now uses or plans to Chapter 3 provides a use any type of oscillothorough but concise ex- scope. planation of the operation and functions of re- CONTENTS: Functional curring and triggered Basics The Cathode sync and sweep circuits. Ray Tube Sweep CirThe operations of the cuits Oscilloscope Cirvarious functional sys- cuitry Setup, Calibratems in a typical trig- tion And Use Scope gered - sweep scope are Versatility in Testing described in Chapter 4. Understanding Scope Advanced Included are the input Specs attenuator, vertical am- Scopes Special Purplifiers, sweep generator, pose Instruments horizontal amplifier, Sophisticated Techpower supply and the niques. --- -- MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 39 TEST INSTRUMENT REPORT DATA TECHNOLOGY MODEL 20 DMM pfd X Servicing of electronic equip- 1604 pfd ment often requires replacing capacitors. Many of us use substitution or other methods of troubleshooting for a defective capacitor because we don't have the additional equipment re- quired to make capacitor measurements. If we employ conventional methods, it becomes a time consuming test setup. Data Technology has introduced the Model 20 DMM that not only provides DC volts, AC volts and ohms measurements but capacitance measurements as For more information about this instrument, circle 100 on the Reader Service Card. well in one instrument package. The instrument is small, resistance or capacitance. 199 (over range indication.) measuring only 2.5 inches by 6.25 Capacitance is measured by The options include: Rack inches by 9 inches, and it weighs employing an integration tech- Mount (single), Rack Mount (side just 3 lbs. It features a high - im- nique, whereby dV/dt (the rate of by - side), Test Lead Kit, Carrying pact case and a single printed - change of voltage with respect to Case, High - Voltage Probe (30 circuit board, with components time) is a function of the unknown kv), 115 v rms Power, 230 IT rms mounted flat for maximum capacitance. Power, 100 v rms Power and IC strength. The unit can be field Capacitors with severe leakage Sockets. Price is $199. stripped in seconds by pulling out affect the readout in the following on two fasteners on the rear of the two ways: 1) a higher capacitance LECTROTECH MODEL BG -10 COLOR GENERATOR cabinet. The top and bottom of the readings and/or 2) the readings cabinet can then be removed for are not duplicated on another A portable color generator, servicing or calibration, if re- range. For example, compact and light enough to be quired. The five - step calibration When: RLEAK CFS= Error= 1% carried in your pocket or tube instructions are clearly printed on Where: RLEAK= Leakage Resis- caddy, provides all test signals the inside of the top cover. tance (Megohm) and patterns required for color TV The operation of the instrument CFS= Full Scale Capaci- setup and convergence. is simplified by employing one tance (µF) This instrument is contained in knob for the setting and the other Example: A capacitor with 1 a metal case with a self - contained for the function selection. A flash- megohm of leakage produces a 1 cable compartment for the RF ing display indicates an input percent readout error when mea- output cable. It measures 3 inches greater than the selected range. A sured on the 0-2000 nf range. wide by 51/2 inches long by 11/4 2 - inch stand makes viewing of This instrument is capable of inches deep. A protective carrying the readings easier and acts as a measuring DC voltages (range + 2 pouch is available as an optional carrying handle. volts to + 1000 volts; resolution accessory. The IC circuitry used yields a lmv to 1000mv), AC voltages The basic stability of a bar low component count and low (range 2 v rms to 800 v rms; reso- generator is determined by the power drain, eliminating heat lution 1 my to 1 volt) and resist- frequency divider circuitry, somebuild - up, crowded circuitry and ances (ranges 2 K to 2 megohm; times referred to as the counters. keeps the production costs down. resolution 1 to 1000 ohms) plus This pattern generator employs When taking capacitance read- capacitance (range 2nf 0.002, µf digital logic to perform all countings, a shielded wire should be to 2000 nf 2, µf; resolution 1 pf to ing functions to achieve a high deused because the long leads can 0.001 µf). The input impedance in gree of stability. As a result, there introduce noise into the compo- the DC measuring mode is 10 are no internal adjustments and nent readings. Effective lead megohms, and 10 megohms its accuracy is not affected by shielding methods are given on shunted by 40 pf in the AC temperature changes. the bottom of the case. Clip - on measuring mode. The conversion The RF output signal available terminals are provided, eliminat- time is 40 ns. The display employs from this unit can be adjusted for ing the use of the long test leads 1/3 - inch Sperry glow - tubes and channels 3, 4 or 5. The RF oscilfor out - of - circuit readings of flashes for counts greater than lator coil is factory tuned to chan 40 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 e For more information about this test instrument, circle 101 on the Reader Service Card. nel 4. This channel output can be changed by adjusting a coil which is accessible through a small opening in the side of the unit when it is in the ON (open) position. When the unit is in the OFF (closed) position, this coil is not accessible. Turning the slug clockwise will increase the frequency to that of channel 5. Turning the slug counterclockwise will decrease the frequency to that of channel 3. A standard .078 - inch hex - head alignment tool is required to make this adjustment. The onloff switch function is automatic to prevent accidentally leaving the instrument on after use and draining the batteries. When the unit is opened to expose the RF output cable, an internal switch automatically turns on the power. When the unit is closed again, the internal switch turns off the power. The LED onloff indicator, which is located on the upper center of the front panel, is also turned on and off by the internal on/off switch. The various patterns are selected by the use of two slide switches. They are the three - position main Pattern Selector and the two - position Row Selector switch. The main pattern selector selects those patterns displayed in the vertical column, while the row selector selects the top or bottom horizontal row. For example: if the DOT pattern were to be selected, turn the pattern selector switch to the dots position. If you wished to display the three - bar color pat- tern, the pattern selector switch would be placed in its center position and the row selector switch Lectrotech Model the power. BG 10 Color Generator shown in the open position which automatically switches on formance of the chroma circuits. It is most useful in troubleshooting the chroma circuits when a standard known signal must be used. When using the color generator to service a color TV receiver, the fine tuning should be correctly adpattern selector switch. If this justed; thereafter it will not be switch is not turned on only black - necessary to retune the receiver as and - white bars will be displayed. the generator is switched from Noted: when b - w patterns are pattern to pattern. The proper method of tuning the being used, this switch must be in the off position; otherwise, be- TV receiver is to use the cross cause of the presence of the color hatch pattern. Turn the fine tunsignal, the display will not be clear ing knob of the TV receiver in the direction that would produce and stable. The six patterns that are pro- sound beats on a live TV signal. As the fine tuning is rotated in this duced by this instrument are: is direction, the vertical lines will bepattern The dot Dot Single used mainly for static con- come dim and then disappear. Turn the fine tuning in the oppovergence. full crosssite direction until the vertical The Crosshatch hatch pattern is used for observing lines become sharp and clear. If the receiver employs a picture both vertical and horizontal linearity and for all dynamic con- peaking control, set this control to the position that produces the vergence procedures The single - sharpest picture. In the soft posiSingle Cross cross pattern is used to determine tion, the vertical line brightness the exact center of picture. It is will be severely reduced. Always also used to evaluate convergence operate the TV receiver at the in the center of the picture tube in lowest brightness and contrast both the vertical and horizontal levels consistent with adequate viewing for the sharpest clearest plane The three - lines. Excessive receiver contrast Three Color Bars bar pattern is most useful when and brightness will cause the TV used in conjunction with a vec- receiver to defocus on the bright torscope. With only three bars on white lines. The instrument is powered by display, the vector patterns can be two 9 - volt batteries and is priced more easily interpreted The color bar at $89.50. Ten Color Bars - - - - ' FINDS INTERMITTANTS nim nvn CHEMTRONICS CHEMTRONICS P pattern is used to test the per- would be placed in its upper position. When the three - bar color pattern or the ten - bar gated rainbow patterns are to be selected, the color onloff switch must be placed in the on position. This switch is located to the right of the main AID FASTER! ...for more details circle 106 TUNOPO WEH A RESTORES TV TUNERS on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 41 TECHNICAL DIGEST The material used in this section is selected from information supplied through the cooperation of the respective manufacturers or their agencies. MAGNAVOX Radio Chassis R243/4/5/7 -Output Failures a single "lumped value" capacitor with a single common ground return. Several redundant value capacitors were spread out at widely spearate locations within the horizontal output circuit in order to conform with HEW regulations. The wiring required with the use of redundant capacitors could, in some instances, produce an undesirable ring effect. A new and unique 4 - lead capacitor has been designed and developed. It is installed on the horizontal output transistor heat sink as shown in the illustration. One feature of this new capacitor is that if there is an open Bias diodes D401 and D402, will often be damaged when a multiple - component output failure occurs on these chassis. These diodes,are difficult to test in the chassis, and they may be overlooked when replacing the other damaged components. Consequently, repeat failure will occur. Every time a multiple - component output failure occurs on these chassis D401 and D402 should be replaced, to guard against a repeat failure. After repairs are completed, be sure to perform the bias adjustment on the amplifiers. LEFT SIOE RINGING YOKE CURRENT L.0 RESONANCES ICI TC2 TC3 SWEEP TRANS PRIMARY 1C4105 ZENITH Color TV Chassis 17/19EC45-Ringing on The Left Side Of Raster The following information is devoted to changes that have been made in color TV chassis to improve their performance and reliability. These changes have been incorporated since the "E" line was introduced. Included are the reasons why the changes were made and the components concerned. Critical Safety Componet New four lead capacitor in Ci -C SWEEP TRANSFORME PRIMARY - the horizontal output circuit. Shown in the illustration are several redundant retrace capacitors. These capacitors are required to guard against excessive high voltage in the event of a single unit failure mode. Guide lines laid down by HEW rules forbid the use of The Wayne Model WT2A 'makes YOU money saves much time "'makes troubleshooting easier A new concept in transistor testing based on proven methods of circuit Patent 3.778.713 analysis. A current limited AC voltage is applied to each semiconductor junction under test. The resulting DC voltage is monitored while the rectifying junction is passing normal rated current. Abnormalities are easily identified. Indicates PNP or NPN Measures relative gain Test leads applied without prior basing knowledge Locates base and collector durind test Indicates silicon or germahium Indicates transistor hon -linearity In -circuit tests with shunt impedance down to THREE ohms Performs all of above and more in less than teh seconds ELECTRONICS 5412 Nordling St./Houston, Texas 77022 ...for more details circle 132 on Reader Service Card 42 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 mode failure, the DC current path is removed from the horizontal output transistor and renders it inoperable. This feature completely eliminates any possibility of"excessive" high voltage being developed which could result from the open mode failure of any one of the redundant capacitors now in the chassis. The compactness and short - lead connections of this new capacitor also prevents the development of multiple resonance. Do not install this capacitor on a receiver which is not equipped with one at the date of manufacture. A second possible cause of ringing on the left side of the raster was found in the B+ supply to the Video IF module. Under certain conditions ringing in the horizontal circuit could be introduced into the +24 volt supply, and then into the video IF stages, and finally into the video stages where it might show up as ringing on the left side of the picture. In order to minimize this possibility, the +24 volt supply for the IF strip was changed from terminal U4 on the sound module to a filtered + 24 volt supply source at terminal W13 on the AGC - Sync module. NEW IN COLOR... continued from page 30 19 - inch (diagonal) model color TV sets. This picture tube is a negative version employs in -line guns and slotted type mask. guardband black matrix The circuit arrangepicture tube which ments for the Quintrix employs the Quintrix picture tubes are shown electron gun having an in Fig. 7 and the regular additional prefocus grid. tetrode picture tube cirIt is the pentode type cuits in Fig. 8. The potenrather than the conven- tial of 02 has an influtional tetrode type. The ence on the cut - off point, tube has the delta con- therefore, a three - posifiguration in 90 - degree tion tap is provided to opversions whereas the timize the voltage on the 110 - degree 19 - inch additional electrode. through test. The insulation cut through strength was increased by NEW PRODUCTS adding a 5 138 COLOR TV MODULE CADDY RCA Parts and Accessories has introduced a bigger and better color TV module caddy. The caddy allows service technicians to carry a larger selection of the modules needed to service RCA modular TV chassis. It comes with one each of the 12 most frequently used RCA modules, and has twice the capacity of the former RCA caddy. There is ample storage mil nylon extrusion over MATV DISTRIBUTION AMPLIFIER 135 Delta - Benco - Cascade has introduced a CATV apartment house amplifier for the MATV market. The DA 60 is a push - pull, high - output level, broadband (40 - 300 MHz) amplifier which is ideal for large apartment complexes. This amplifier on a 12 channel system can be driven to 60 dBmV without noticeably affecting the picture quality. With a wide range - the Vulkene insulation of the 15 and 20 kv DC wires. Heavier wall insulation on the 30 and 40 kv DC sizes provides ample protection, eliminating the need for the nylon to meet the requirements. SUBSTITUTE TUNER 137 Added to the Telematic Kaddy Mate line is the AC powered, Model KTE 725 Tuner - Mate. The unit operates on all VHF channels with the capability space, both in the bottom and in the lid, to hold extras of all the modules currently available. Other items such as the RCA Home Service Handbook, the XL - 100 Components Kit, or certain tools can be placed in the caddy. The slim design also makes it easy to handle and measures only 8 inches deep. The price is $118, with a full complement of modules. of gain and tilt controls, it has a flat operating gain of 45 dB which can be reduced to 10 dB with two switchable 139 TEFLON LUBRICANT Wonderglide Lube Products Corp. has introduced a lubricant called Wonder -Glide, which has many uses in electronics. It can be used to lubricate TV tuners, switches and attenuators and continuous gain control. The 15 dB switchable attenuators can be preadjusted to the required values, knowing the approximate input level, and the design output level. All settings are shown on the cover plate. Price is $175. HIGH VOLTAGE TV WIRE 136 The Wire and Cable Business Dept. of General Electric Co. has developed a thin - wall, flexible wire for high voltage television applications. The wire is rated at 15 and 20 VDC, com- plements the departments 30 and 40 kv DC TV wire. The flexible wire surpasses all applicable UL requirements, including the mechanical cut - of checking an existing UHF tuner by mixing it through its own UHF tuner channel strip. The tuner is of the latest solid - state design with low current drain. It can be used as a substitute unit while the original tuner is being repaired, allowing continued use of the TV set. other moving parts, including telescoping antennas. Since it prevents rust, an application of the lubricant on antenna elements will lengthen their lives. In addition, it can be used to FINALLY... A BREAKTHROUGH IN TUNER DEGREASERS new: aEMTaoxics SUPER TUN -0-WASH a» OM. 50Z MORE DEGREASIAG POWER ...for more details circle 151 on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 43 MEDICAL ELECTRONICS... Continued from page 23 representation for 0-300 BPM, allowing the use of a simple voltmeter as the readout device. (This also simplifies servicing.) PATIENT SAFETY FACTORS 346 Ways To Save On Instruments! EICO's Test Instruments line is the industry's most comprehensive because each instrument serves a specific group of professional needs. You name the requirementfrom a resistance box to a VTVM, from a signal tracer to a scope, from a tube tester to a color TV generator, etc., you can depend on EICO to give you the best professional value. Compare our latest solid state instruments at your local EICO Electronics Distributor, he knows your needs best-and serves your requirements with the best values! "Build -it -Yourself" and save up to 50% with our famous electronic kits. For latest EICO Catalog on Test Instruments, Automotive and Hobby Electronics, Eicocraft Project kits, Burglar -Fire Alarm Systems and name of nearest EICO Distributor, check reader service card or send 50¢ for fast first class mail service. EICO-283 Malta Street, Brooklyn, N.Y. 11207 30 years of service to the Professional / Serviceman. O ( EICO i ...for more details circle 109 44 / on Reader Service Card ELECTRONIC TECHNICIAN/DEALER, Many of us have seen published accounts of how little current it takes to kill. Most of these accounts state that 300 milliamperes is the "lethal level of current." This is true only through intact skin. In certain hospital situations in which the body is "invaded," a much lower level of current is lethal. Although there is much debate over just how low the lethal level is, most authorities accept 10 microamperes as the maximum safe level of uncontrolled current which should be allowed to flow in a patient's body. This becomes a concern for the servicer because of leakage currents existing on the chassis and cabinets of equipment being serviced. Capacitive coupling between the AC power wiring and the chassis causes a minute cur- rent to flow on the chassis. More chances to be right Thousands more cross references A ground wire, the so - called "third wire," in the power cable drains the leakage current harmlessly off to ground. Consequently, not only is it essential that the servicer check for ground continuity, he should also check for proper tension of the ground lug on the power plug. If that stud is bent or flattened or if the spring in the wall socket is weak, insufficient contact force will cause a weak ground. Typical leakage current values for a poor but present ground are three or four times the maximum limit of 10 microamperes. Transistor kit for foreign sets Replacement amplifier modules IN PART 2 Next month, we will continue to discuss medical instruments, including the defibrillator (which is over - used by TV show "doctors" to resuscitate a failed heart) plus test equipment needed for medical servicing and a few RF devices used in the operating room. For those of us whose gray hair can no longer be gracefully denied, some of these latter devices will appear surprisingly similar to the "spark gap" transmitters used before the universal availability of RF power generating vacuum tubes. MAY 1975 All the help you need at your authorized distributor Tube Products Department General Electric Company Owensboro, Kentucky 42301 GENERAL ELECTRIC lubricate motors, gears, sliding windows and doors, door hinges, pulleys, locks, appliances, drawers, etc. The lubricant is not affected by salt water and is good in operating temperatures ranging from 25°F to + 400°F. It is available in tubes, jars and aerosol spray cans. - permits working on live contacts. The burnisher comes with six .007 - inch thick blades. It can also be used with .0035 - inch thick blades, new satin finish blades, or 11/4 inch by .025 diameter ball ended (ball diameter .020) abrasive rods for cleaning concave points. P. K. Neuses, Inc., offers zow mìflgei 140 STAPLE GUN TACKER The Model T-37 Staple Gun Tacker is introduced by Arrow Fastener Co., Inc. It is designed for safe, fast and efficient fastening of wiring objects up to 5/16 in diameter. The tapered striking edge gets into close corners and the grooved guide positions the wires for proper staple envelopment. A grooved driving blade stops the staple at the o driver sets By Xcelite the most complete line of contact - cleaning tools designed for any type of contact silver, platinum, gold, pal- ladium, tungsten, molybdenum. These tools, being non - residual, leave no filings, grit, dust or film to start a new carbonaceous build - up. All burnishers are insulated, flexible and economical with just enough stiffness to apply the right amount of pressure to the contact face offering minimum wear on costly contacts. right height to prevent wire damage. The round crown staple snug - fits the wire for neat installation. The all steel constructed stapler is widely used in telephone, electrical, electronics, CATV and communications industries. Takes 3/9 inch, 1/2 inch and 9/16 inch staples. 141 CONTACT BURNISHER The CB - 5 pocket burnisher comes with a handy clip and magazine of extra blades. The blades fit into a chuck at the end of the barrel allowing the user practically any degree of blade rigidity by simply varying the depth of the blade in the chuck. The insulated black plastic barrel and cap OF POPULAR SCREWS AND NUTS 142 OSCILLOSCOPE A new 15 -MHz dual - channel oscilloscope, Model 1222A from Hewlett Packard has a built - in delay line to DOUBLE DUTY ON DOZENS FOR O O 0 0 © Three new assortments have joined Xcelite's family of "Compact Converti- make visible the leading edge of traces, a feature of special value in digital applications. It provides the user the option of viewing Channel A with Channel B either added or subtracted (A ± B modes). Identical dual channels provide calibrated X - Y displays. The oscilloscope has 3% vertical accuracy, calibrated 8 x 10 cm display, internal graticule to eliminate parallax, do coupling, triggered sweep and pushbutton beam - finder. Deflection factor is adjustable from a sensitive 2 mV/cm to 10 V/cm, so the instrument is useful not only for the general run of bles." Each an Xcelite "original." Nowhere will you find such a variety of sizes and types in a midget set, for driving slotted, Phillips, Allen, Scruloxn, hex, and clutch head screws. And hex nuts. All of professional quality, precision made of finest materials. All doing "double duty" with torque amplifier handle that slips over color -coded midget tools for longer reach, greater driving power. Each easily identifiable on the bench or in the service kit thru Xcelite's exclusive, optically clear, plastic "show case" that closes securely with positive snap -lock. NEW! (C-.(----)RNELL ELECTRONICS COMPANY 4213 N. UNIVERSITY AVE. THE ORIGINAL HOME OF Same Low Price East or West Coast! * ** SAN DIEGO CALIF. 92105 Bargain Tools Transistor Tester Technician's Library SPECIAL OFFER ON ALL ORDERS ONE YEAR GUARANTEE _ INDIVIDUALLY WEER TUBE NLESS OTHERWISE PRICE 100 TUBES O.1 MORE 'UBE 33cE t, .t I BOXED 5 DAY MONEY BACK OFFER LAB TESTED USED SEND FOR FREE NEW 48 PAGE COLOR CATALOG * Dumont Picture * Diodes-Transistors--Kits * Cartons Tubes Tube Your Order FREE if OVER $10.00 25' PER TUBE FROM THIS LIST 6AG5 6AU6 6AX4 6CB6 616 6SN7 Not Shipped in 24 Hours ...for more details circle 108 on Reader Service Card -3 slot tip, 2 Phillips screwdrivers, 5 nutdrivers PS140-4 slot tip, 3 Phillips screwdrivers, 3 nutdrivers PS6-3 slot tip, 3 Phillips screwdrivers PS130 - PS88, PS120, PS7, PS89, PS44, PLUS and PS -TR -1 with varying selec- tions of screwdrivers and nutdrivers. Ask your local distributor or write ... Weller-Xcelite Electronics Division Au The Cooper Group COOPER INDUSTRIES e P.O. Boo 728 Apex, North Carolina 27502 ...tor more details circle 133 on Reader Service Card 45 MAY 1975, ELECTRONIC TECHNICIAN/DEALER (right) has a 24 -inch -square plywood top and is capable of handling loads up to 250 lbs. The Test Table has a 17 inch by 19 -inch angled top at a 34 -inch working height and rubber casters for finger-tip mobility. The plywood top is THE CURVE TRACER insulated against "shorts" and THAT WON'T "grounds", non -marring, and heat resistant. A lower shelf is included with both tables; the Test Table's sec- COLLECT DUSt logic, control, audio and video measurements but also for such low - level uses as receiver tests. Built - in TV sync separation assures stable, automatic triggering on frame or line for convenient TV trouble - shooting. Calibrated sweep, accurate within four percent, makes it easy to diagnose ond shelf offering the same protection as its angled top. Both tables come partially - assembled in sturdy, reshippable cartons. They offer users five minute nut - and - bolt assembly. timing problems. The instrument weighs 161/4 lbs. Price is $895. ALL PURPOSE/TEST TABLE The Hickok Model 440 semiconductor curve tracer is all purpose and convenient to use. It's the ideal instrument for The General Electric Tube Products Dept. is making available to electronic servicers two sturdy, roll - around tables for a wide variety of in - shop applications. The All - Purpose Table testing, evaluating, classifying and matching all types of transistors, FET's and diodes. You'll get stable, full range dynamic displays that you can accurately scale right from the screen. Pull-out card for easy, fast set-up and operation. Set-up marks for rapid set-up COLOR TV BOOK Brand new, all -in -one book. Over 500 trouble shooting tech -tips. Covers all leading manufacturers, Admiral, Emerson, GE, Magnavox, Motorola, Panasonic, Philco, RCA, Silvertone, Sony, Sylvania and many others. Full schematic diagrams help you find symptoms, cause and cure of recurring troubles in all types of situations. Saves you time and money. BACK ISSUES. PLEASE SEND: MAIL CHECK OR MONEY ORDER TO: the value innovator TV TECH AID INSTRUMENTATION & CONTROLS DIVISION THE HICKOK ELECTRICAL INSTRUMENT CO. 10514 Dupont Avenue Cleveland, Ohio 44108 (216) 541-8060 TWX: 810-421-8286 P.O. Box 603 Kings Park, N.Y. 11754 ELECTRONIC TECHNICIAN/DEALER, MAY 1975 Many new miniaturized MATV passive devices are introduced by RMS Electronics, Inc. They are hybrid split - TV TECH AID $16500 ...for more details circle 114 on Reader Service Card 144 1975 technical bulletin. HICKOK MATV PASSIVE DEVICES GET YOUR ALL NEW, BIG TV TWINS of 80% of tests. Unique INSTA -BETA display takes the guesswork out of transistor and FET parameter measurement. In -or -out of circuit testing. A full range professional tracer at a price you can afford. The Model 440 is the most modern, versatile tracer available. See it at your Hickok distributor or send for our 46 / 143 ES12 GET 'EM WHILE THEY LAST!! SPECIAL REDUCEDRATES 1970 Book Form $3.00 1971 12 Issues 1971 1972 B&W Book $3.00 12 1 1975 .11973 12 Issues $3.00 $3.00 1974 Issues $3.00 All New Color 12 Name Address City State ...for more details circle 131 on Reader Service Card Issues $5.95 TV Book $7.95 Zip TAB ALL-IN -ONE SCHEMATIC I SERVICING MANUALS FOR COLOR and B & W TV, RADIOS and HI-FI alignHere is complete service data, including full-size schematic diagrams, waveforms, setup andpopular ment instructions, field modification changes, trouble case histories, etc., for the most of the name -brand TV receivers. Each manual contains everything needed to service all models each brands covered, including full-size schematic diagrams for every model year. In addition, techmanual has something special to offer in the way of unique or improved trouble -finding niques or in other informative material related to TV servicing in general. Most manuals have parts lists included. All are 8%" z 11", 196 or more pages, including schematic diagram foldout. UNEACH MANUAL PRICED AT $7.95 IN LONG -LIFE LEATHERETTE, $4.95 IN PAPERBACK, LESS OTHERWISE NOTED. MAGNAVOX. Covers all chassis designations from Series 36 to T946-including the latest 36-page foldall-transistor models. 160 ppa., plusOrder No. 672 out with 13 complete schematics. MOTOROLA. Covers all chassis designations.160 Mi.. plus 36 TS -613. through TS -454 from page foldout with 15 schematic diagrams. Order No. 594 PHILCO. Covers 42 different chassis designations, line). from 15G20 to 20V35 ("N" through "T" com160 ppa., plus 36 -page foldout with 24 Order No. 584 plete schematic diagrams. RCA. Covers 33 different chassis designations, from foldKCS136 to KCS178. 176 pps., plus 36 -page Order No. 549 out with 16 schematic diagrams. SYLVANIA. Covers 22 different chassis designations from A01 through B14. also 572 through with 598 chassis. 160 pps., plus 36 -page foldout Order No. 599 22 full-size schematic diagrams. ZENITH. Covers 55 different chassis designations, 1Y22to from 13Al2 to 14M23 and 1M30120 with 19 1155. 180 pps., plus 36 -page foldout Order No. 552 complete schematic diagrams. SPECIAL SCHEMATIC/SERVICING MANUALS TV TUNER SCHEMATIC/SERVICING MANUAL. A one source guide to all the info you need to adjust and repair ANY VHF or UHF TV . from the tube -type turrets to modern tuner varactor tuners. Save time, trouble & money by repairing those tuners in your own shop! Tuner repairs are typically Quite simple and straightcapable of being effected in the forward average shop with ordinary tools and skills-with the aid of this complete guide which alphabetically, brand by brand, describes the principles of repand resentative tuners, their theory of operation,alignotters special service tips, helpful diagrams, ment procedures. trap coil adjustments. `ideal" waveform photos, selected test points, and even complete schematic diagrams for every conceivable type of tuner -including the lastest varactor varities. A very comprehensive Appendix contains manufacturer's service hints, special notes and other helpful data. Brands covered are: Admiral. General Electric, Magnavox. Motorola. Philco- -and COLOR TV MANUALS RCA Vol. 2. Covers all chassis from CTC39X to CTC55. 212 pos.. incl. 36 -page foldout with 12 SERVICING THE NEW MODULAR COLOR TV list. Includes Motorola diagrams. parts 48. schematic 1. RCA CPC VOL. RECEIVERS Order No. 578-$8,95 Leatherette; $5.95 Paper Quasar CTV7&8, Philco B -Line 3CS and 3CY RCA Vol. 3. Covers all chassis from CTC48 to (90&91) . Covers service, alignment, setup, and 18 CTC60. 196 ppa., incl. 36 -page foldout with 12 adjustment for latest models. 176 pps., with full-size schematics. Includes parts list. Order No. 662 page foldout schematic section. TV Order No. 720-$8.95 Leatherette; $5.95 Paper SERVICING THE NEW MODULAR COLOR RCA Vol. 4, Covers all chassis from CTC55 to RECEIVERS Vol. 2. General Electric MA & JA 196 ppa., incl. 36 -page foldout with 12 & CTC71. CTS -38 Packard -Bell T979, chassis, Magnavox full-size schematics. Includes parts list. 42, Zenith 25DC-57 & 58, Covers service, align Order No. 721-$8.95 Leatherette; $5.95 Paper meut, setup, adjustment for these solid-state sets. SEARS. Covers Ultra models 4059: 4064; 4072; plus special section on troubleshooting IC circuit4195, fi, & 7; 4369; 4374, 5, 6, 7, 8, & 9: Ford. RCA. Sony, Sylvania. Zenith, 224 pps., ry, 178 pps., with 6 full-size schematics in big 43503 & 13. Medalist models 4360. 61, 62, 63, Order No. 883 hundreds of schematic and illus. 18 -page foldout section. 67, 71, 76, & 77; 4380, 1, & 2; 43801. 11, & Order No. 698-$9,85 Leatherette; $8.95 paper ADMIRAL Vol. 1. Covers chassis Dll to 12013, 12: 43806, 16, & 26. Hybrid models 4091 & 5; JAPANESE CONSUMER ELECTRONICS incl. K 10hybrid. 196 ppa.. incl. 36 -page foldout 6, & 7: 4314, 5, & 8; 4124, 5, 6, 7, 4111; SCHEMATIC -SERVICING MANUAL. A wealth with 12 schematics. 4, 4330. 1, 2, 3, 4329; 4326; 4320. 1, & 2; of circuit diagrams for 89 models representing Order No. 545-$8.95 Leatherette: $5.85 Paper 5, & 6: 4350 & 2; 4358 & 9; 41103: 41682: Midland, K16 manufacturers -1%-C. Lloyd's, seven ADMIRAL Vol. 2. Covers modular M20 pps.. 41881: 43146, 56, 66, & 76; 43266; 43511, Panasonic, Sanyo, Sharp, and Toshiba. This vast through K20, and basic 930 chassis. 1961 228 lists. parts & 61. Includes 31, 41. 51 selection of schematics covers AM radios, clock incl. 36 -page foldout with 11 schematic diagrams. sche12 full-size foldout with pos., incl. 36 -page radios, AM -FM receivers. FM stereo sets, multi Cross referenced to Emerson and Montgomery Ward matics_ Order No. 841 band receivers, radio & tape player combinations, sets. Order No. 740-$8.95 Leatherette; $5.85 Paper cassette recorders, phonographs. and TV receivers: AIRLINE (for Montgomery Ward/Airline models). from 576 Vol. chassis 1 Covers all SYLVANIA s one-stop source of schematics for the models Covers modular chassis 3M20. 20M20, & M25; to solid-state E01. 196 pps., incl. 36 -page foldout every enterprising technician faces almost every hybrids 3K19, 20K1ò, 21K19. 20K17, 21Kwith 12 schematics. day. Useful information includes: transistor and 17, 22K18, 23K18 24K18. T7K10, T11K10, Paper Leatherette; No. 539-$8.95 $5.95 Order IC cross reference, tips on recorder -player ,servicT20K10. T21K10, ií22%10, T23K10. T24K10, Includes SYLVANIA Vol. 2. Covers latest D14. D15 ing, troubleshooting and alignment help for AM T25K10, GEN -12743, and GEN-12973. incl. 36 through 1)19, plus new solid-state F02 and upFM and FM stereo receivers, and several troubleservice notes and parts lists. 196 pps., dated E01 chassis, 212 ppa., incl. 36 -page foldout shooting charts listing general problems and their page foldout with 12 full-size schematics. Order No. 618 with 8 full-size schematic diagrams. causes. 196 pos., including 36 -page schematic Order No. 741-$8.95 Leatherette; $5.95 Paper foldout section. EMERSON See Admiral Vol. 2. TOSHIBA. Covers 24 models, C721; 0721BM Order No. 732-$8.95 Leatherette; $5.95 Paper 0742; C742C; C924; C924BM; C932; C933 GENERAL ELECTRIC Vol. 1. Covers all chassis JAPANESE RADIO, RECORD & TAPE PLAYC942; C942C: C094; C0940; C335; C335C from CA to KE, incl. HB and HI Porte -Color. ER SERVICE MANUAL. Sourcebook for schemaC6A; C7A; C8A; C501S CS02WR; C811S 196 pps., incl. 36 -page foldout with 12 full-size tics, alignment data, service tips on a wide range C927; C321, Includes parts C812WD; C912B; schematic diagrams. Paper 12 of import models of record players, multiband raLeatherette: $5.95 foldout including plus 36 -page No. 536-88.95 lists. 160 ppa., Order dios, cassette tape players, and 8 -track cartridge full-size schematic diagrams. GENERAL ELECTRIC Vol. 2. Covers solid-state L-2, tape players. Covers popular import brands such Order No. 760-$8.95 Leatherette; $5.95 Paper JA, H-2, H-3, H-4, N-1, N-2, KE-11, C-2,foldout as Craig, Gambles. Hitachi, JVC. Lafayette, Midand L -T2 chassis. 212 pps., incl. 36 -page Zenith Vol. 1. Covers all chassis from 14Z8C50 land, Montgomery Ward, Panasonic, Sharp, Maswith 10 full-size schematic diagrams. Order No. 808 to 27KC20. 196 pps., incl. 36 -page foldout with terwork, Realistic, and others. 228 pps., includOrder No. 502 12 full-size schematic diagrams. JAPANESE Vol. 1. Covers 12 models. SONYing schematic diagram foldout. KV KV -7010UÁ KV -1220U; KV -120011 Zenith Vol. 2. Covers all chassis from 12Á8C14 Order No. 842-59.95 Leatherette; $6.95 Paper CU -51P; incl. -62T; CT pos.. -32T; CN 196 -HARP CN 40E050. 900011; SI through 4ß25C19 and HOW TO REPAIR SOLID-STATE IMPORTS. 50P; CY-61P; C2010 2030; C6010, 8010, 36 -page foldout with 12 full-size schematic diaAmong this vast collection of nearly 100 hard -to Order No. 582 9310; MIDLAND 15-214, 212 pps., incl. 36-pg. grams. find schematics you'll find such names as Allied, chassis foldout with 12 full-size schematic diagrams. 23 different 3. over Zenith Vol. Covers Lloyd's, Panasonic, Crown, Midland, Penncrest, Order No. 580 designations. 14DC14, 15, 15Z. 16, 16Z. 14Toshiba, and Matsushita, representing the major (& up) JAPANESE Vol. 2. Covers 17 models. PANA29 & 30; 19DC11 & 18CC27. 0014 foreign -made chassis distributed in the U.S. And SONIC CT -25; CT -65; CT -95; CT-97; CT-98; 12; 19DC19Z, & 20; 20CC50 & 50Z; 23DC14: to help you find replacement parts there is a brand CT -99; HITACHI CFA 450. 460; CNU-870. & 57; the 25CC25, 50 & 55: 25DC56 list of importers and distributors of Japanese con7300; 880, 890; CSU -690; DELMONICO 7208; new 1974 17-19EC45; 25EC58 series .just resumer products. There's also a chapter to help you to BRAD7408; 7438 7500; cross-referenced leased. 180 pps., incl. 36 -page schematic foldwhen a schematic isn't available. 160 pps., plus Order No. 668 FORD, PENÑCREST & SINGER. Incl. parts list. out, Order No. 532 24 -page foldout section. with 12 sche-page foldout incl. 36 212 pps., SERVICING ELECTRONIC ORGANS. Here's No. Order 576 BLACK di WHITE TV MANUALS matic diagrams. your "ticket" to the exciting and rapidly growing JAPANESE Vol. 3. Covers 16 models, HITACHI ADMIRAL.. Covers 58 different chassis designafield of electronic organ service and repair, coverSW11-220; CTU-970; CU -100; CWU-220. CQ tions, from C to K series, including NA1-1A solid ing the most popular instruments in use today: Chassis; CRX; CR -350; CORONADO 611: T5000: state. 160 ppa., plies 36 -page foldout with 12 Artisan, Baldwin, Conn. Gulbransen, Hammond. T5002; 9K18: 10K18; SANYO 31035; 51CNo. Order 589 schematic diagrams. complete Lowrey, Magnavox. Rodgers, Thomas. etc. This 51R; 91057; 91057R. Includes parts lists. 228 GENERAL ELECTRIC. Covers 25 basic chassis carefully planned schematic service manual clearly Order No. 684 pps., incl. 36 -page foldout. 160 ppa.. how the various electronic circuits work designations, from AA to V-2. explains Series models, SHARP JAPANESE Vol. 4. Covers 26 plus 36 -page foldout with 16 complete schematic -tone-generating, keying, "voicing," and special C-922; C-1227; C-1321; 0-1517; C-1723; COrder No. 558 diagrams. effects systems, etc. A special feature of this 1724; C-1725: C-1921; 0-1923: C-1925: Cmanual is the 36 -page foldout section which conJAPANESE. Covers 77 models, HITACHI 1A-50 1926; C-2011; C-2031; C-9311; MGA (MITto TWU65; PANASONIC TR-4113 to TWU-65; tains numerous organ schematic diagrams. 160 CS -130; CS -170; CS -195; CS -197; SUBISHI lips., plus 36 -page foldout. section. Leatherette cover SHARP SQ65P to 58D, 212 pps. incl. 36 -page MIDLAND 15-212; 15-213 15-215: 15-225; Order No. 503 only. foldout with schematic diagrams. órder No. 602 15-228; 15-229; 15-239. includes parts lists. 212 pos.. incl. 36 -page foldout. Order No. 692-$8.95 Leatherette; $5.95 Paper JAPANESE Vol. 5. Covers 9 models. SONY These Complete Schematic Servicing Manuals Available on 10-Day Free Trial! KV -1201; KV -1212; KV -1500; KV -1510; KV 1710; KV -1720; KV -1722: KV-1730R; KV 5000. 196 pps., incl. 36 -page foldout. TAB BOOKS , Blue Ridge Summst, Pa. 17214 Order No. 700-$8.95 Leatherette; $5.95 Paper understand you fully guarantee Please send me the Schematic/Servicing Manuals indicated below. MAGNAVOX Vol. 1. Covers all chassis from Series may return them in 10 days for immediate refund or cancellation of invoice. your Manuals, and that 37 to T940. 196 ppa., incl. 36 -page foldout with Order No. 526 Please send on 10 -Day FREE trial. 12 full-size schematics. Please send postpaid. D I enclose $ MAGNAVOX Vol. 2. Covers all chassis from T950 (Please specify paperbound or leatherette.) Please send C.O.D. to T962. 196 ppa., incl. 36-page foldout with 9 Order No. Order No. Order No. Order No. Order No. Order No. Order No. Order No. 589 full-size schematics. MOTOROLA Vol. 1. Covers all chassis from TS transistor TS -915907 to TS -924 including all 919. 178 ppa., incl. 18 -page foldout with 6 fullOrder No. 509 size schematic diagrams. MOTOROLA Vol. 2. Covers all chassis from TS -929 to TS -938, including remote control systems. Also Name additional information on TS -915-919. 196 pps., incl. 36 -page foldout with 9 schematics. Order No. 584-$8.95 Leatherette; $5.95 Paper Phone Company PHILCO. Covers all chassis from 15M90-91 to 20QT87-90. 196 pps., incl. 36 -page foldout with Address 12 schematics. Order No. 522-$8.95 Leatherette; $5.95 Paper Zip State RCA Vol. 1. Covers all chassis from CTC12 to City CTC40. 212 pps., incl. 36 -page foldout with 12 EM55 (Paid orders shipped prepaid. Pa. resident add 6% Sales Tax. Outside USA 10% extra.) full-size schematics. Order No. 496-$8.95 Leatherette; $5.95 Paper MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 47 ...tor more details circle 105 on Reader Service Card - ; I I . DELUXE ters available in two - way, three way, four - way, and eight - way models, FM taps, directional taps, directional couplers, and attenuators. All feature completely sealed housings that are zinc die cast and nickel plated, for use indoors and outdoors. Since DIGITAL COLOR CONVERGENCE GENERATOR NOW AT A PRICE EVERYONE CAN AFFORD ROCK SOLID PATTERNS SEND FOR OUR BIG FREE WHOLESALE CATALOG FOR DEALERS ONLY! We do not sell the consumer! ALL IC COUNTDOWN CIRCUITS QUARTZ CRYSTAL 1 OSCILLATORS I 2 FULL YEARS' WARRANTY Save on thousands of audio, and electronic parts, test equipment and accessories. IEC s r Ir MULLARD - 33c MINIMUM 10 POPULAR 6GH8 ORDER No. X 114 MODEL $9995 SG -200 SEND CHECK WITH ORDER - WE PAY SHIPPING CHARGE 10 Patterns: Full & Gated Rainbow, 4 Crosshatch, 4 Dot, Die,Casted 1/8" Alu- GnGi40.l llin NVÈIiGENCE ® QUALITONE INDUSTRIES, INC. they are non - corrosive, the components are suitable for installations near salt water and extreme humidity. Shown in the photo is the Model 1040/S FM tap. minum Case. 17 Name Company GENEgpT. Address GALVANIC IRON AND STEEL PROTECTION '"II' r,fa^C Columbus Avenue, Tuckahoe, N.Y. 10707 Please send FREE Catalog to: 145 City State/Zip Radio and televi- SG -150 10 Patterns: B&W Bars, White Field, 4 Crosshatch, 4 Dot. MODEL Elenco Electronic, In,. I i SG -100 ONLY $5995 Patterns: 20 x 16 Crosshatch, 320 Dots, weight only 17 oz. FULL 15 DAYS MONEY BACK GUARANTEE YOUR DISTRIBUTOR OR WRITE: ELENCO ELECTRONICS INC. 8744 W. North Ter., Niles, III. 60648 312.564-0919 MODEL SG L] My check or money order enclosed. COD-Add $2.50 mailing & handling. NAME ADDRESS CITY STATE ZIP DISTRIBUTORS' INQUIRIES INVITED rE 1 1 I CRC ZINC IT allows on - the - job application with its aerosol characteristic. The action of the chemi- cal preserves the I 1 65-: p1jr. Cad Gpi:,e.m iy ;...i i nee. aMh ette E YM 0]!illE and is effective even when its surface is scratched or abraded. The spray reaches every portion of the metal coating pores and minute cracks. It dries to a smooth, matte gray finish in 15 minutes and can be painted over, if desired. 1 1 1 I 1 1 146 1 designed International Rectifier R210, 2 - amp "universal" rectifier with an improved surge rating is introduced. The 2 - amp, 1000 volt rectifier is housed in a smaller case style and has a 60 - amp surge rating compared to the 50 amps available previously. this provides much greater protection against surge currents caused by line voltage transients. The univert al device replaces all rectifiers in commercial and entertainment equipment. I A newly - 1 1 I I 9 technician... I MTI offers I professional 1 on Reader Service Card Don't cut yourself out of a career as a two-way radio 1 I RECTIFIER ...for more details circle 110 on Reader Service Card ELECTRONIC TECHNICIAN/DEALER, MAY 1975 48 ...tor more details circle 123 use of CRC ZINC IT from CRC Chemicals. Providing the security of hot - dipped galvanization, underlying metal 2 SEE sion transmission towers can be protected through the $ 7595 MODEL the only training for FM two-way radio available. Qualified technicians are employed in government, industry, and public service. But training is your key. You could cut out a career as a two-way radio technician by cutting out this coupon. We'll send you information on how you can learn more about this specialized field, at home, for only $345. Name Address City/State/Zip am a veteran or serviceman on active duty. I MT/ 1 1 formerly I MOTOROLA TRAINING I College INSTITUTE HEI1. Summerdale. Pennsylvania 1704, Ilr ...for more details circle 118 on Reader Service Card DEALER SHOWCASE AUTO FM AMPLIFIER 147 A new auto FM stereo amplifier which provides instant voice communications between two points. Both stations can originate calls to the other, and hands - free communication is featured for the remote station. It is not necessary to have AC outlets near that boosts fading FM signals into clear, crisp listening is introduced by Antennacraft. This small electronic FREE FREE to introduce you to of SOLID STATE REPLACEMENT RECTIFIER TUBES unit installs in minutes under the dash with no special tools. It works with any 12 volt negative ground system, and does not affect AM listening. The package contains everything for easy installation. MICROPHONE 148 these intercom units because a separate, power supply is used. No batteries are required in this system. The cabinets are constructed of heavy gauge, enameled steel and solid walnut. The amplifier is completely solid state and the switches are designed for normal office use. A heavy - duty model is available for applications with extra high traffic conditions. your customers will appreciate. Eliminates need to replace defective No filament winding on flyback. X-radiation. Reduces fire hazards. No filaments to fail. Reliable. Solid Faster warm-up for picture. state. Much higher Modernizes older sets. profit than vacuum tubes. Get the full story on EDI Solid Tubes® rectifiers, and get a free Silicon Focus Rectifier too, just by asking -on your letterhead or business card, please. A directional microphone to allow live insertions in the presentation of a cassette/slide presentation has been introduced by 3M Co. The microphone permits remote control of three popular Wollensak AV visual - sync re- Solid state rectifier tube replacements offer many servicing and profit advan6 Solid -Tube® types replace tages: up to 37 different high voltage They're something vacuum tubes. Help your Heart... Help your ELECTRONIC DEVICES, INC. dB e Heart Fund American Heart Association Oaks Ave., N.Y. 10710 Telephone 914-965-4400 21 Gray idYonkers, ...for more details circle 150 De -solder the easy on Reader Service Card way- -with WIK-IT® corders for public address use. The noise - cancelling characteristics of the new microphone make it especially suitable for PA work. Directional characteristics keep acoustic feedback at a minimum and it may be either hand - held or mounted on a stand. In addition to the normal on/off switch, it has a pushbutton pause control which stops the tape recorder (and the slide sequence). As long as the button is held, the recorder is stopped; tape motion resumes as soon as the button is released. The microphone is supplied with a 20 - foot cord, and comes with a padded vinyl storage/ carrying case. It is priced at $99.95. INTERCOM 149 A new One + One Intercom is introduced byFisher Berkeley - EKTACOM Free sample on request To de-solder fast, easily, cheaply-just place WIK-IT® on the soldered joint. Then apply the iron. The solder simply disappears into the WIK-IT®. No splattering, no component damage, no lifted pads, no delamination, no measling, no contamination. WIK-IT® comes in sizes for tiny circuit boards or large components. WIK-IT® is the patented leader in de -soldering. Meets MIL and other specs. At your parts store or order from WIK-Ir. WIK-IT ELECTRONICS CORP. 140 COMMERCIAL ST. SUNNYVALE, CA 94086 (408) 732-8560 ...for more details circle 134 on Reader Service Card MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 49 CLASSIFIED 100 PRECISION RESISTORS, assorted values all 1%. Send $1.00 + 25 cents postage to P.O. Box 3081, Granada Hills, Calif. RATES: 35ír per word: 45st per word Bold Face Type. Add $3.00 if you wish Box Number. Minimum $10.00 charge. Classified Display Rate billed $40.00 per inch, 1 inch minimum. Remittance must accompany order. Mail ad copy to: Roz Markhouse, ET/D, 757 3rd Ave., N.Y., N.Y. 10017. 91344. SAVE! Best discounts. CB and marine transceivers. Brand names. CBS, 4647 130th Ave., S.E., Bellevue, WA 98006. - CLASSIFIED ADS SELL -SELL CANADIANS SAVE BIG MONEY! SURPLUS, CLEAROUTS AND BANKRUPTCY INVENTORIES. HIFI AND PARTS. CATALOGS $1.00. ETCO-D, For Sale - RADIO & T.V. TUBES 36 cents each. Send for free Catalog. Cornell, 4215-17 University, San Diego, Calif. 92105. UHF VHF FM OLOR ELECTRONICS. Box 741, MONTREAL H3C 2V2. I Lakeside picture tube rebuilding equipment oven/bombarder, sealing machine, etc. $700.00 complete. Leonard's TV & Radio, Inc., 1431 Colorado Ave., Lorain, Ohio 44052. DYNACO-A-R, transistors, repairsboards & units, speaker service. Send for prices and details: BEAR ELECTRONICS, 177-ET-Hillcrest Road, Mt. Vernon, NY 10552. DESCRAMBLERS Several models to choose . . . operates with all scanner and monitor receivers. from ! Write or Call for Catalog Phone (501) 273-5340 KRYSTAL KITS, Box 445, BENTONVILLE, ARK. 72712 -SELL CHEMTRONICS CHEMICALS* Whal Soldering Irons and Heat Guns* Transistors, Diodes, Resistors, etc. For the technician or the do it yourselfer. Distributor Prices. Send 25g for catalogue BOX 100 I II ETD 7- *SKY -SLOT* ANTENNA (TV-FM),R> *Trademark U. S. Pat. No. 3577196 TV & RADIO TUBES .36e EA!! Send for free color parts catalog. Your order free if not shipped in 24 hours. Cornell Electronics 4215-17 University San Diego California 92105 TV -FM -HAM 2 m. ANTENNA NEW ROLLABLE (with perfect color band -width). Just unroll and stick on wall. Uses no masts, no rabbit ears, no dangerous plugging to AC lines, and NO SIGNAL SPLITTERS since the VHF -UHF -FM terminals (VHF usable for NEW ORGAN KIT BUILDER'S GUIDE $3.00. Circuits, block diagrams, details on diode keyed IC divider and independent oscillator designs. Many new kits and models. Keyboards also for synthesizers. Manual cost refundable with purchase. DEVTRONIX ORGAN PRODUCTS, Dept. A, 5872 Amapola Dr., San Jose, CA 95129. 220 MHz FM) available at the same time. (New 1971 slotted design with U.S. Patent S/N 3577196). Made of decorative foil/plastic yet rugged for use in yacht or RV. Optionak Plain burlap or printed etching on burlap of either desert, galaxy or leaved branch. Antenna size-. 18' s 48' unrolled, works behind picture, against metal! Price is only $15 for model with following gain: (VHF 9 de), (UHF 12 dB), (FM 6 dB); gains above dipole. Order postpaid AIRMAIL, insured, from ANTENNA DESIGN CO. 11621 HUGHES AVE., N.E. ALBUQUERQUE, N.M. 87112 send a message... r ANTENNAS for Shortwave, Monitor, Scanner receivers. Efficient, moderately priced. SWL Guide, 414 E. Newcastle, Syracuse, NY 13219. ...write here. TUBES receiving, factory boxed, low prices, free price list. Transleteronic, Inc. 1365 39th St., Brooklyn, N.Y. 11218A, Telephone; 212-633-2800. HARD - TO - FIND TV & RADIO PARTS 1. Number of insertions: (circle) 1 2 3 Start with (month) .. of month preceding) 3. Amount enclosed: $ 6 NEW AND USED. ASK ANYWAY CMC 4329-4 WOODMAN, SHERMAN OAKS, CA. 91423 12 issue (Copy must be in by 1st 2. UNUSUAL SURPLUS, CLOSEOUTS AND PARTS CATALOG. RUSH $1. ETCO-4 ELECTRONICS. Box 741, PAYMENT MUST ACCOMPANY ORDER WE'LL BILL RATED FIRMS NO AGENCY COMMISSION NAME MONTREAL H3C2V2. NEW MAGNAVOX and GE TUNERS $19.95 each. These tuners are new first line and NOT rebuilt, universal or seconds. Send $19.95 and old tuner to Texas tuner service, 4210 N.E. 28th St., Ft. Worth, Texas 76117. COMPANY STREET CITY L ZIP STATE MAIL COPY FOR AD(S) TO: ROZ MARKHOUSE, Electronic Technician/Dealer, 757 Third Ave., New York, N.Y. 10017 RATES: 35e per word; 45e per word Bold Face Type. Add $3.00 if you wish Box Number. Minimum $10.00 charge. Classified Display Rate billed $40.00 per inch, 1 inch minimum. ELECTRONIC TECHNICIAN/DEALER 50 / ELECTRONIC TECHNICIAN/DEALER, MAY 1975 I J POWER AMP modules: Direct - coupled Op -Amp design produces 50 watts rms, 10hz-100khz, negligible distortion. Requires simple power supply. $28; 2/$54 ppd, or send for specs. R. Brown, 1233 Somerset Dr., San Jose, Calif. 95132. Educational Courses CLASSIFIED TECHNICIANS: Learn advanced elec- tronics and supporting subjects, and earn college degree by correspondence. Free brochure. Grantham Electronics Engineering School, 2000 Stoner Ave., Los Angeles, CA 90025. - High Earnings, REPAIR TV TUNERS Complete Course Details, 12 Repair Tricks, Many Plans, Two Lessons, all for $2. Refundable. Frank Bocek, Box 3236, Ent., Redding, CA 96001. Manuals and Periodicals EVERYTHING you always wanted to know about service contracts, but didn't know who to ask. "THE SERVICE CONTRACT COOKBOOK" only postpaid when you ask $15.00 NATESA, Dept. SC, 5908 S. Troy, Chicago, IL 60629. AMATEUR SCIENTISTS, Electronics Ex- - perimenters, Science Fair Students... Construction plans Complete, including drawings, schematics, parts list with prices Psychedelic and sources...Robot Man shows Lasers -Emotion/Lie Detector = Touch Tone Dial Quadraphonic Adapter - - Ignition - Burglar - Transistorized Sound Meter...over 60 items. Send 25 cents coin (no stamps) for complete catalog. Technical Writers Group, Box 5994, University Station, Raleigh, N.C. 27607. Alarm ®DOCU BILL GODBOUT ELECTRONICS r 8008 PROCESSOR $50.00 CHIP 62102/2602 1 X 1024 NMOS RAM 8/$65.00 G25203 2048 BIT (8 X 256) EROM $19.95 1-8008 8-G2102/2602 $130.00 1-625203 1103 MOS DYNAMIC 1X1024 $1.95 8038 FUNCTION GENERATOR 12V 8A POWER SUPPLY KIT 3/5.00 $ 4.50 EVERYTHING EXCEPT CHASSIS INCLUDE POSTAGE FOR 8 LBS. $18.95 close out!digital clock Construction Plans - NEW CANADIAN MAGAZINE. "ELECTRONICS WORKSHOP." $5.00 YEARLY. SAMPLE $1.00. ETCO-C, Box 741, MONTREAL H3C2V2. - DIGITAL IC Manual - Latest Edition 1500 types by types/diagram number function digital computer kit $3.95. 32 IC, transistors, instructions, $14.00. IC numerous circuits applications manual Analog/Digital, $3.95. Electronetics ETD, P.O. Box 127, Hopedale, Mass. 01747. - - - MANUALS for Govt. surplus radios, test sets, scopes, list 50¢ (coin). BOOKS, 7218 Roanne Drive, Washington, DC 20021 Business Opportunities ELECTRONICS/AVIONICS EMPLOYMENT OPPORTUNITIES. Report on jobs now open. Details FREE. Aviation Employment Information Service, Box 240 Y, Northport, New York 11768. kit $23.73 TELEComplete Construction Plans PHONE: Answering Device, Automatic Dialer, "Black Boxes," Call Diverter, Call Limiter, Conference Bridge, Central Dial Exchange, Melodic Ringing, RecorderActuator, Remote Control, Schematics, Speakerphone, Telelink Burglar Alarm, Voice Scrambler, $3.00 each. ELECTRONIC: Biofeedback Conditioner, Horticulture Stimulator, Multifrequency Encoder Network (Speeds telephone calling 100%!). $5.00 each. ONE YEAR SUBSCRIPTION to Telephone Electronics Line (TEL) $6.00. "The Legal Aspects of Interconnection" book, $29.95. All of the construction plans above plus a one year subscription to TEL $29.95. TELETRONICS COMPANY OF AMERICA, 22035 Burbank Blvd., Suite 122, Woodland Hills, Calif. 91364. COMPUTERS! You can build them large and fast or small and economical. Design procedure and construction manual $3.00. Free info. DIGITRONICS CO., Dept. Man., 667 East 1700 South, Orem, UT 84057. Red Cross. The Good FOR SALE Established Radio & TV Sales and service in Sunny Arizona. Retiring. P.O. Box 236, Mesa, Arizona 85201. SELL MAGNETIC SIGNS -Full or Part Time Salesman Needed - Big Commissions Fast Service - Write Today For Free Information Magnetic Signs Dept. Ed Plaza Garden #18 Villas, New Jersey 08251. BOX 2673, OAKLAND AIRPORT, CA 94614 CPU E MEMORY SET AS ABOVE HEAR POLICE/FIRE Dispatchers! Catalog shows exclusive official directories of "confidential" channels. Send self-addressed stamped envelope. Dealers wanted. Communications, Box 56 ET, Commack, NY 11725. Neighbor. M IelepIls e e fflrimenter FOR SALE MI -PHONE PLANS: 13.o0 each. Arnw,ring Ikvice, Amomalic Diakr, "Black Box". Call Divener, (nit Limiter. C«.ferexe Bridge. Central Dial Exchange, Melodic Ringing Generator. Recorder -Actuator, Remote Control. Schematics. Speakerphone. Telelink Borate Alarm. Voice Scrambler, Dial/Tone Converter, Tone/Dial Converter. BUSINESS FOR SALE SAN LUIS THE SECRETS YOUR TELEPHONE °' OFLEARN MISC. PLANS: CALIFORNIA RESIDENTS ADD sales tax. 5.00 each. Multifrequency Encoder Neiworh. Harticultore Biofeedback Conditioner. Stimulator, Dodecahedron Speaker Exlesme, Photographic Admit Amen. ALL OF THE CONSTRUCTION PLANS ABOVE OBISPO, CAL. excellent shop in college town, prime location; $8,000. Call Jerry Holland, agent, 805-544-1034. Business for Sale - in operation for 15 years. Service contracts for Admiral, Magnavox, GTE Sylvania and Zenith. Building 40 x 60; two floors all Air Conditioned with 20 x 40 Garage equipped to service our 5 trucks. Second location 20 x 80 building. This company is a service man's service shop. Radio dispatched, Top Reputation. D. & B. Rated. Write Starlight TV, 1551 Montauk Highway, Oakdale, L. I., N. Y. 11769; Phone 516-589-4424. National Safety Council If you don't like thinking about safety, think where you'd be without it. So4,5 AIRMAILER. q ' tlr8llks Ike , -di?Isilbe.: - Have yon ever wnd,rd what lies behind that telephone dial? Now yoo can learn the tricks of the lelepho, trade Get the inside story of tekphone systems -their quirks and flaws. and remain up to date on vital xeorener, within the telephxe industry. TELEPHONE ELECTRONICS LINE iy Phone Phreak, and publication designed for the tel,pho,, experimenter. containing Interesting aside, which offer a wealth of hard to find information. Technical theory is also disrussd. among the following item.: oh.,!,., Current News Items Code Numbers Illustrations Games Facts Plans Projects History Comics Stories Facts prieviously Tel. Co. confidenin TELL tial is now published 5.0o, C.n.di.o Emig. Moo. One Tex a.bmriptio. rate: United Stotts & ALL OF THE CONSTRUCTION PLANS ABOVE PLUS A ONE YEAR SUB- SCRIPTJON TO TELEPHONE ELECTRONICS LINE TE LEAL FULL 6 DIGIT LED DISPLAY - 12/24 HR HANDSOME ALUM50/60 HZ OPERATION! INUM CASE APPROX 2" X 511 X 1}11. ALL COMPONENTS, PC BOARD, WITH COMPLETE INSTRUCTIONS FOR EASY ASSEMBLY. Include 501 handling on orders under $10.00 PLANS Established Television Sales and Service Business located in the growing Front Range area of Colorado. For further information write: S. Ellis, P. O. Box 1947, EVERGREEN, Colorado 80439. San,. AIRMAILED. ASPECT= SF ITEEcOUEECT1SN S_,.os AIRMAII. EII. The complete reference book to your LEGAL RIGHTS as a telephone sub- scriber. Study toll evasion, tariffs, wiretapping, customer provided equipment, and many morel ALL OF THE CONSTRUCTION PLANS ABOVE AND A ONE YEAR SUBSCRIPTION AIRMAILED. TO TEL PLUS THE LEGAL ASPECTS OF INTERCONNECTION": T C uu Spec Rya 22035 BURBANK BLUO.,WOODLAND HILLS CA 91364 US% TF 5-75 MAY 1975, ELECTRONIC TECHNICIAN/DEALER / 51 READER T & T VALUE SALE RAYTHEON, I.C.C., RCA, SYLVANIA FAMOUS MAKE, NEW JOBBER -BOXED TUBES NOW WITH NEW 5 -YEAR GUARANTEE 80% Off LIST ppD 1V2 2A V2 3AT2 3GK5 3H A5 3CU3 5 for $3.00 6H A5 8H V5 D 6JE8 8,166 6K A8 6K E8 6K T8 D 6KZ8 D 6L B6 5 for $3.95 6 for $4.80 11.80 11.15 5 for 4.90 $9.30 5 for 4.85 $6.15 5 for $4.80 $7.65 5 for $6.16 $6.85 6G H8 5 for $5.90 $5.15 6B K4 5 for $9.35 10.75 6CJ3 6 for $4.70 6LQ6 11.15 67$4.70 12B Y7 D EH 5 for 7 5 for $7.00 $$4.80 D 5 for 8FJ 7 5 for $3.75 D 23294.508 6 for $6.00 $ BGFT 5 for $6.65 33GY7 5 for $8.05 OOHS 5 for $3.96 36MC6 5 for 11.40 60J7 5 for $3.40 38 H E7 5 for $9.20 'FREE -$300.00 LIST WORTH OF MERCHANDISE WITH ANY PURCHASE OF 100 TUBES ABOVE. A 8GH8 SPECIAL 100 for $69 200 for $119 e 3A3 5 for $ 5.05 $$ 6 5 5 5 5 5 5 6 6 for for for for for for for for for 6E4.50 SYLVANIA TUBES - NEW FACTORY BOXED 70% & 10% Off LIST 3A3 5 for $6.82 BHAS 5 for $6.48 6BK4 12.62 14.51 6CJ3 55for $6.35 6LQ6 5 forfor 15.05 6FQ7 6 for $5.06 17JZ8 5 for $6.08 80H8 5 for $5.33 C 2329 5 for $8.10 ENTIRE LINE OF TUBES AVAILABLE TRANSISTORS XACT. REPLACEMENT (BOXED) Up To 90% off LIST SK 3009 3018 3041 3052 3054 3082 3083 3084 3103 ECG155 102A 121 152 for $3.80 for $2.25 for $4.20 for $3.80 5 for $4.60 5 for $3.90 5 for $5.25 5 for $6.00 6 for $3.00 5 for 4.90 5 for 3.90 5 for 8.81 5 for $10.00 6 for $15.00 $2.50 ea. ECG743 $2.95 5 5 5 6 131 184 226 188 196 157 ECG131 ECG182 ECG183 HEP707 SK3077 162 IC508 $2., ECG726 SERVICE INDEX $45.95 102 Arrow Fastener Co., Inc. 8 103 Astatic Corporation 3 104 Book Club Tab Books 34-37 105 Book Club Techmatic 47 106 Chemtronics, Inc. 41 151 Chemtronics, Inc. 43 Zen. Voltage Tripler 212-136 D Y84 Y118 ó 10 for $$2.50 2 for 8.00 YOKES - TUNERS - FLYS EQUIV. Y105 Y130 Y107 Y109 ea. $6.95 G DY107AC any 4 for $23.95 $10.00 $15.00 $3.85 4 Asst. Tuners new 4 Asst. Combo Tuners new Phllco Tuner new 76-14329.1 ea. AUDIO - CARTRIDGES - NEEDLES REPL. 60 Min. Cassette Irish 6 for $3.00 84 Min. 8 -Track Irish Tape 3 for $3.00 Equiv.: Shure 44, N75. $2.95 Equiv.: 13Pickering V15 ea. $2.95 BSR Cart. SX6M SX1M SC5M 4 for $8.00 16 Assort. Needles Incl. Diamond $4.95 25' Stereo Headphone Ext. Cord 5 for $8.75 Emerson Mikes 10 for $4.00 8 -Track Head Cleaner 5 for $3.50 Cassette Head Cleaner 10 for $4.00 4", 5", 6", 2x4", 4x6", 3x5" All 12 for 2 of each: Panasonic 42 Stud Cartridge Ast. N302D Rec. 506D Ast. N601 D Rec. 504D Ast. N429SD Rec. 609 RCA 118199 Arista RC1 OD ANTENNAS D 300 ohm 2 -Set Coupler O 300 ohm 4 -Set Coupler 72 ohm 2 -Set Coupler D 59U Connectors 19 & 25" 12 12 10 10 $13.95 $2.95 for $6.00 for $6.00 for $6.00 for $5.00 ea. 10 for $7.50 10 for $10.00 2 for $4.00 100 for $10.00 52 Cleveland Institute of Electronics 53 Color Boosters 3 for $10.95 Belfuse 2250-1 25 for $2.50 Blue Laterals Magnets w/P.R. 10 for $10.00 Panasonic Focus Resist. Pt. 4,'ERR10F JK167P ea. $3.85 Panasonic TSA 965-5 Antenna ea. $2.26 Minimum Orders 550.-F.O,B. Brooklyn, N.Y. Catalogs Refundable upon your order C.O.D.-CASH ONLY -50% DEPOSIT 51: T & T SALES CO. 4802 AVENUE K BROOKLYN, N. Y. 11234 Phone: (212) 241.5940 ..for more details circle 128 on Reader Service Card ...for more details circle 119 on Reader Service Card APPLIANCE REPAIR BOOKS Written in easy -to -understand language by experts with illustrations & diagrams Acclaimed by instructors & professionals. How to diagnose & repair air conditioners. refrigerators, vacuum cleaners, ranges. washers, dryers, steam irons. portable kitchen appliances. water heaters; plus how to set up a shop. using test instruments and more. Only $2.65 to $4.90 each! C & N, DEPT. ET, 5841 MONTROSE, CHICAGO 60634 ...for more details circle 107 on Reader Service Card IT'S NO PUZZLE TO ORDER 108 Cornell Electronics 45 109 Eico Electronic Instruments Co 44 110 Elenco Electronics, Inc. 48 150 Electronic Devices 111 49 Enterprise Development Corp. 8 ..52 112 Fordham Radio Supply Co., Inc GTE Sylvania Consumer Renewal 1 and 2 OELRICH SERVICE FORMS FOR TV-RA010 & 2 WAY RADIO SERVICE LEGAL FORMS FOR CALIF. FLA. UTAH NOW AT YOUR PARTS JOBBER OR WRITE FOR CATALOG AM 4040 Tube Division 44 OELRICH PUBLICATIONS N. NASHVILLE AVE. CHICAGO. ILLINOIS FREE CATALOG O HARD -TO -FIND PRECISION TOOLS Lists more than 2000 items -pliers, tweezers, wire strippers, vacuum systems, relay tools, optical equipment, tool kits and cases. Also includes ten pages of useful "Tool Tips" to aid in tool selection. JENSEN TOOLS 4117 N. IA W © 441115611, Phoenix, Ariz. 85018 ...for more details circle 115 on Reader Service Card 113 Heath Company, The 12 114 Hickock Electrical Inst. Co. 46 MOVING? BE SURE 115 Jensen Tools and Alloys 52 TO LET US KNOW 116 Leader Instruments Corp. ...Cover 117 Mallory Distributor Products Co. 3 48 119 Mountain West Alarm Supply Co. 52 120 Oelrich Publications 52 PTS Electronics; Inc. Cover 2 122 Perma-Power Company 6 123 Qualitone Industries, Inc. 48 124 Quasar Electronics Corp. 31 125 RCA Solid State 7 RCA Picture Tubes 17 126 Simpson Electric Co. 27 127 Sprague Products Co. 11 128 T&T Sales Company 52 129 Triplett Corporation Cover 4 130 Tuner Service Corporation 131 TV Tech Aid YOUR NEW ADDRESS. ...4 118 Motorola Training Institute 121 00634 ...for more details circle 120 on Reader Service Card e General Electric Company, GENERAL 21" mountain west alarm 4215 n. 16th st., phoenix, az. 85016 SEND FOR FREE DESCRIPTIVE PRICE LIST 107 Charous and Niebergall, Inc. Our Price $35.95 0004 pop W Castle Tuner Subber Mark IV Castle Mezzer Field Strength Meter FSM-V Reg. $119.95 Our Price $99 RCA Color Bar Generator Model WR -608B Reg. $89.90 Our Price $68.85 DIODES & RECTIFIERS RCA Damper Diode Equiv. To: RCA 120818 $1.35 RCA 135832 $2.85 ITT 6500 PIV Color Focus Rect. 10 for $5.00 2.5 amp 1000 PIV IR170 100 for $8.95 Full line of professional burglar and fire alarm systems and supplies. 96 pages, 450 items. Off the shelf delivery, quantity prices. ADVERTISER'S INDEX LARGE DISCOUNTS ON ALL TEST EQUIPMENT Reg. ALARM CATALOG FREE 19 46 132 Wayne Electronics 42 133 Weller Xcelite Electronics Division 45 134 Wik-It Electronics Corp. 49 DISCOUNT TEST EQUIPMENT SPECIALISTS Bi HICKOK oF=t Rea E/CO2-7 COMPLETE LINE OF ELECTRONIC SUPPLIES ICC/Mullard & Raytheon Tubes Telematic Test Rigs FREE CATALOG QUOTATIONS ON REQUEST FOR»HIIM Radio Supply Co., Inc. 558 Morris Ave., Bronx, N.Y. 10451 Tel: (212) 585-0330 ...for more details circle 112 on Reader Service Card ELECTRONIC 1583 TECHNICIAN/DEALER ADMIRAL 7.frit= TV Chassis T5R3 ADMIRAL PART NO. DESCRIPTION SYMBOL R208- 500K vol, on/off switch R320 -30K, video contrast COMPLETE MANUFACTURER S' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR S NEW SETS 75A1-185 75A112-13 75A101-16 75A100-8 75A101-17 61A48-1 R418- height control R422 R466 -1.2M vert hold control -vert lin control R502-5.5 ohm, fuse type C504A-150mf, 156v C5048 SCHEMATIC NO. ADMIRAL GFtOGF' 1583 ZENITH TV Chassis 19FB14 1587 1584 ZENITH 1586 TV Chassis T5R3 27 AIRLINE TRAV-LER VHF TUNER 94A438-2 1 1 I A8852-9 1/28JIf V8 SOURD V30.38 C203 0201 lPY® IE «Ur T5.6 1.5111 IEO L- STIIPSC2 2NAUL13 'i25LJ8 .11411E1 'i25LJ8 Vi 02A 02B 210 121 1206 1214 2101 - - 44.8., 6 /Y 2 13 DI WIRE eOj6 1 l ¡ 41 5%T 0I NiCTME 11lf 31DECINP I J ClIS 1.1,101 L JE10/OI a10 IALf 14A/f UCIGr1 V303A 1 Alr 9 1303 151 21 ®Y LLLHYD 11 1.5141 T "-H0,30( OSZD C311 OINt r-120N1- 0 1t I i 1000 3H A5 6// 1 I 100° I411M1 v, 01 f {-6I--) h000 560 1113 Yf I 3 5 Ia0 I i1133 10I/51110w 101.1! 5040 YN/ TOO Ñ0 Y4/ LINE C 33 Mfg IOr.f_ 13000 ---1 115 lil 530 ---------I-4 %// 57821-2 KiUNf OC Y01 /ACES /1101 NEASII1N S/6NA1 DINEO/1M516NA1 S/NEN6TN 1011/CES NOT /N 001 NfASUAfO 01111 SICK. I r 1465 IT. Oft- /Stt I Saari' tY1/NE Coe I ElfAXAA/Ií0 SNAIIEA RN AArNfCTS N el slot Of WY IC lief. III 116 SfIYK/N{' 171Z8 5401 V304 00 0® o eve 110r AC 411/ au LL7II ` isOr AC L C119 110 10% 0212 I/NIITIEI VERT. 6120 10% 1502 5e 9355-9L MORI/ PHASE V404 N011í -1 AC YE11 1 In II YOKE 5 5% 1110 C423 .00221 br 0022111 - 6418 1119 821 I6f0 C125 ORTIE 40612 61 1-6IY /. IJ /YI 1460 154 1 n 2 ab 1451 1.51 1153 1201 40111 TO/+1 6101 - '0610 93C52.1 2201 4503 118711151 1Ulr 750,51 AP I 11113r) 115 100.5r C503 6J 15011 115 3 Ic(SOIFso/6 5G6 10I/OJ IN// 4W 0504, .00051 it 77,- IC/31 C Cuy I 1511, 02711F 113 EAST FIRST STREET. DULUTH, MINNESOTA I,XIGeri, Sff NOTE 47/11011. NI-ASA, OC YO( uCf. IOM. '/233GY7A DA APE v403B 59.T i 15C6 1 5 3:5. M011í L403 CHIC 20011 COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 6I,1I6 N/026111 0131 .0171F T Lö u5vl 1455 I10Y SIL CO. ' 1103 CÁ0 1459 5% _A_ 10% 55802 fNfSEN1 KSfD. 615 1450 611,51. rViIACfCl//lpN fK,ffDN/CNKM1ICfSI1f g 401 417(0,e I0 00SfMC IAYE- 1ABrSUN(fSSSU/1AR'f 1fS1fW/IYfNJ /S A9AN E1SUAE X1121712-, -/l JI O 6501 OEA 71 !111 1402 I L404 C121 Off CR401 CR50 ATR.IfRACf. 050/m1 ILI M.V.RECTIFIEI 11461 4826 II220 1401 IBC2 HOLD ITC 461r 2AlP 1001J 5 a C127 2700 V TUSE Y I II 0324 1501 /0 101 CITO V302 00 =1100 1280 J WI, 6SI/S- I. 50óÌ 422 L}. NEC IIY OpA711E1500E OC ro/IICE. HORIZ. HOLD 6GH8A OFF SWITCH CITI L401 8326= INIrI Of 121 rC118 Foe 0110 /OW 14010 1VERT. OOIIF IIY ILUE1 1Eo Á0511F I ï CIII 561 V202 IVI+IOOSINI I[0 I! 5 I-nY tt rl 00 00 00 (-1 00 ON O 10% VEIi o 8JV8 V303 m 1, -- 6-7 {A128 1127 -1_ HEIGHT 1200 5402 0403 1425 } 1403 J WWI C113 .0í311F,10%( I1B 1700I I '325 8E07 AN P TI a10 Or Mil /NINO/ 17Of000Y1iti Sfll/AY'. 0401888 1115 271 ,5304 1421 2.7RFC I/217JZ8 BELLO! 00 00 0131 .04711E'S501 .502 05,/ /50111/01 TIAISIOANf11Nf1 N/I1 G1/III aCl 0I101E0. CAN IURE 1 1501 P06' MERI./OUI851 10% 220 1119 TYIE 6666 CUT rç1T 1 . `, °ICICRE II-SEf 01/7/01107f Al I/CNI " 2131 -Ir PICTURE 33GY7A 1Ar455/S 6Ad/N0. tldl/NC: 4DT6 I ---------_4. rA11f5 /NN/CDIAa05/OK,ON/f550111EIlISC 1MED 11000 C0 I I /// AND N/N. V101 00 V201 YNf OSC 3 OSC VV'I i 3HA5-1 v102 J CUM .0 1420 0,A 918138-2 I SCNfMTK NORS. 1 NAR/ AC/ NOHIIfO aFlK1Y51a N/If0 S15IfN IIXlACE N/1/ VA07 I//N SEIJIIC OMAAY1NtTS. 105/5101 Y1101-5 IA17 10% , CANIL'/l0A ri TIDIER 00 I I 4 YIR INDICATED. OC V01/ACE51fASU1f0 IN VIM di WV 4C 111E, NA/ MofOCOe/AIX 3117/AC 641 5LJ8 UHF MIXER lisi I r 93A59-1 11511 C108 IFC 11 iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii ti '/217J Z 8 i 14 %//H//////%% .or ///////////////// ',-ISTU4ELIMF_ MON II ACC -1 Rif a1r10SEAVKfM/fNAATS. IIIIIIIIIIIIII v302e 2.2110 6 CONTROL OAV U101151.-~, 1.1111 12VAEP4 2 VIDEO /f 356 II BEL. 1311 e1-'ó : 51 STOP _ SEP -. UHF TUNER 94A461-2 MA 'IINT 660AIA 10Y. '/26GH8A V8 '/28J V2028 zi/7 L309 117 20% COA. re>v -6 r----- $220 210 ID% I5 ® 5 5'4 s 0 4308 C304 1302 1316 7301 I 6320 11.311 Zo C302 o CO L--R311,1.21 C710 411 - I11 L310 C311 L- 500 .. IO//V 1_307 I 10306 1509 . - ,SY YERf I<21M1 0SV -TON1 l'/28JV8 L303` I2 1301 MAKI 1 1 1;;i1111 Ili CR304 r -- 1303 C{'31T5%2 I*601M 1301 Cy, 61202 11213 681 VIDEO DE1 L302 EARPHONE JACK -y roles 310 20'6 SP201 SPINIER /1501E101110/ I C201 1001 fill!INTO! ' Eel ./Sr 56011-.021/ 93C8.1 F 1 v3024 /0/r r//7 V301 i -- - J T5R3-1A T5R3-2A 2620 IW1 R215 i1.5R62 CHASSIS sauro 051151 12,0 1/26GH8A S 17 ' UHF 94A465-2 94A461-2 1201 5001 I 4BZ6 If 05C 94A438-2 1/28JV8 0209 3300 5% 1975 MAY 93A52-1 VHF tuner IIL202 C207 I +#r C20/ 10% - silicon rectifier VOLUME I /102 1 -video detect -horiz phase detect CR301 CR401 CR501 r---17 C213 - T403-horiz output xformer 12200 CIO2EL201A .11.L.1 - C110 110f17g4 ILO -audio output xformer 1303 -sound takeoff xformer 1401- vert output xformer 1402 deflect yoke assmy -w..vIOI+IMsf ,11 HT V201 SOUND 25i .0016 IMF IF STRIP MANUEL 4DT6A ARP 72A132-77 94A17-19 79A124-5 72A185-5 79A139-4 94A372-2 79A138-30 93A8-1 93A5-10 MODEL CHART VHF CRT 12VAEP4 94A363-2 12VAEP4 94A438-2 FINISH Walnut Walnut 1 12P647 12P647M 1585 Color TV Chassis T41K10-4A/B I - 150mf, 150v MODEL Color TV Chassis 19FC45Z Color TV Model GAI -12915A 1 -201 67A30-11 67A30-11 67A30-11 C504C-200mí, 150v SCHEMATIC NO. L202 -quad coil L401- horiz lock coil 1584 1=1..ein 1975 MAY Color TV Model GAI -12915A WMTfi 11-/ ELECTRONIC AIRLINE TPB3 Base Ist Vldeo Amp I COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS 101012 5V 025V mam MIR ( MON úulpal God (PHI 5. Pm 4 Collector. Ist Vldeo Amp 15101 8V PP Vert IPWSII 3 Veri IPWSII P -P . 4 V61240VPPHow Plate (Po 1012/0 Vadea Amp IV2A150' Contrast. 100V PP Video. 150V PP Blanking. 5 AS IPWS21 1V P P 3 58MHz Butte 15191.224 P -P Hon: Base. 3 58MH1 Butter 10191. 2 3V PP How E miner. 3 5814F Buser 1513/.2 2V P P Horta Base. 020 and Q21 6V PP. Hora 30 Collector RI Demodulator 10211,1.5V P -P Hon/ IPWSII lancoon R034 and RF46.22V P.P Hont IPWS21 21 TPF2. R-t Amp Output 14Aí, 22 3 me No Color, 90V PP Hann 0PWS21 RY AmpOut0u1 IV4AI Color, 250V PP Hora YAmpOutWtNACI wnh Color, 280V P P How TPF3 G-1 Amp Output(V48) 25 TPF4 B 24 TPF2, oath Color. 1500 IPW$21 (PWS21 Collector Sync Separator 15111.6VPP Ven IP10011 ll. Plate 8 60V IN 41 Svnc Amp P -P 5281. Vert. IPWS21 VVVJVVV w. pfflo0111611113130 1 20 Separator(Q1 Vert IPWSII Base. Sync 6 Vert -GC" (PWS21 I`r IY1IPPrAtI TPA? Sound Detector 2 Vert IPWSII P P r Collector. Hord. Blanket 16 Mont P -P Base, Hon/ Blanker1)15/. 17 10 151. Hord "2- IPWSII 3 3V P P 5.8V 28 Hallt IPWSII P -P IPCI. Base. Bust Amp IQ121. 6V P -P Hora IPWSII Collector. Collector. Burst Amp 10121. 45V P -P Hard. IPWSII 29 IPWS21 31 Collector. IIV P -P 3 58MHz Osc 10181, Hont (PWS1) 32 Cathode. Burst Gate Dade IDC 191,12 5V P-P How IPWS I I IPWSII I L 1- TIM _ -- 1_12_ 1! 2 ~ Lrtlt 1N11 1r11A ' 1 CNA1a 17F 94A463-2 ---allo --50_ id --'d- VHF TUNER WW CNMI12L maim _-3 2 1 1 1 S Q-- CIO- Ntl CO30 LYS I --tra 20 C133- 21 IW Lelobo (.-±-j '! ITT VHF AFC 054 criÿl 055 510145 VHF MIXERS CYN Crll 113 CWs 'F Crll SS Is' - CVO IYII I 1at. 00 Sff/OIrrNI C0Á2 CN ASSOCARE . r 2su51 T. s 1 IT J4CI II TP t I 35 I}I CU2 106 /500 IN CATI 1500 CPU 11112 0472 5110 Z 1% ACC MI CM CM CM MOo moo 400 1000 H F-ì H I.5 _ Iri ¡ol iPi r Il[C p 11411O ¡151 1 I 1Hrº 1113IA o IN., }INr DELAY lut TITOS 3.61,5% 2JY 10 SILECTLI 1531 -1 3000 uN[ Ur ` 11Wr 111110 MICI 051 VALU[ CISL 012 0 UHF TUNER 94A462-1 I.II[C (010(10M[r1'0JfF1Ya.10[eh[!(S. sr u1r uIT t lOUNfLIA(f ;5;0 r - r/ IOII! rff IVI 1.110 2. ///////. r 10 41.21 0n ICUO uN INS .2230 MSNrr/111N1/1( FUSE INTERLOCK 122 1 221 Nl - 828 10f - { * --C. _ Sill 111 LINE FILTER 1111/I 1NI. - OM. ACC ,VII 1000 5411010 LAN 11Y ICI SKCIIiIO IT YA(O!5 lY O(, IIOOC/AIC( S fI la CMAMUS: (10 suns! 0100/17/01 eel CN 10mf/350v electro CHT4A, B -2000mf/40v, 2000mf/40v electro RH150A, B -bleeder focus module RA82-2K AGC delay RA83-2K AGC RC64-10K color kill RE54-3.4M vert size 015 /%210-1-111% `N1 "V 578950-12 1C4901 C1000C17 3 CtSO - -- REACTANCE Olt C IN01000 Iql I 93C64 -I PHASE DET. 1015 100-11 ii 10W= ra51 i31 °f ÌÓT 1031 1121 a° 151 1/11 con ;.22 ODIO M L i PW51 0 I4 151 CONVERGENCE CM441 08190-4 200010 V . BOTTOM VIEWS OF LC2 93842-T RICXT LAMP -G VERT. c 211 lla HORIT. TRANSISTORS SATE ICI 11181 0042 017 t11E 11111 511141-12 LC! 93842-10.1F1' , 31C14/-11 EEIIrTEI LEFT 1 MSC C SN 117 37115/ -II 10011 MASTIC CAS[ 111tS CICIPT 010 CO 1011110 /MIS 0 f R-C CC VERT. 50 BLUE 2. COILS K45 610 61 9384 -T milVERT.BAL I 20 1120 LC20 CLAMP DC11= COILS 67A15-415 67A15-413 61A71-1 75A101-31 75A101-31 75A101-18 75A95-18 75A95-18 75A95-18 75A198-4 RH29-350 ohm contrast RH34-500 ohm tint ... RH39-500 ohm color RH42-50K volume w/SH41 RH125-5M high voltage adj RH149-30M focus adj LA5 - coil 47.25MHz trap LC16-coil chroma take off LC34-coil 47 UH 2nd bandpass LD52-coil UH 3.58MHz output LD63-coil 10 UH demod LF24-coil horiz adj MH57-deflect yoke inc. PH49 1 75A198-3 75A198-2 75A198-2 1 A -PUSO -Oh--. _ rOINn/LO LT Ill.- PWS3 it IlA 75A140-31 75A135-57 75A108-8 72A316-12 72A329-1 73A55-28 73A55-37 73A55-8 94A351-1 94A571-2 72A216-7 TA59-xformer 4.5MHz trap TB20-xformer ratio detect TC14- xformer burst TC29-xformer bandpass TH2-xformer line choke TH4 72A318-1 72A325-3 72A327-1 73A31-16 80A108-14 79A169-3 79A141-4 79A165-1 - xformer power TH18-xformer horiz output TH44-xformer audio output TH73- xformer vert output FH5-fuse .225a chemical FH27 84A28-12 84A28-16 - fuse 2.25a chemical 94A462-1 94A463-2 tuner UHF tuner VHF COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 BOR1T ULI l 01411 CLAMP ^ CC31 BLU HORIZ. CRLECTN S11I10 COIICCTIOI 5 Saat 1 UT( f 15 I, ID[ LEFT 500 1127,120 r 117 1622 10 NI' Big ü 110 Cut LUO 5oWCl BOT.BUI _HMI roo ICI NIT ICAaI MOOT HORIZ.R-G BAL Cc5 -21 COLL[CIP MAW - 202 tt -III ASST. CCI Lcs4 11-1440"1C1 CCM Il,1N1 1701 BURST I 578148-12 AIRLINE PART NO. D-300mf/350v, 300mf/350v, BOmf/200v, 011 0 Air HORIZ. BLANKING 1tOtt rol RIGHT BLU tall B 578137-12 SYNC SEPARATOR ÇKM '0" 11,5% PHASE DET. 0011 R 1 DESCRIPTION 10 1101 lI/0 C Cao 10 roof III LS0N0(Off 0 1001 (1455/1 N10IS1N 04/1/01 10 41a0 045411 IO 211001111 10405/31170 (L, tat (S/ 01(pOa 1(100'f0 04140. rro: 0011/ .410 111 4IO01 tie, 70 C14SSiS MOW Mat u0150. MS114K11/0 tl0r 11/I 10 0/C/05f 10/! OAL 01 041 (MO O3f CI11/1110102 r(11 411/I(11I/ 2501/ 1111111 COIN lfCISJ/Y( Me41 1014IS/5101 r4II IO N7 rll II0I0/I401 001/111I MI OM 1111/0415 N N CSISS/S 000510 00 501 uJ/S7IKf 124211(0(1112101012 011,22%, 111111 00 ogee 0I025 1041' /W IrK7, 451(11 45 411 101(1 NI MAW. gM AM Mari 30/11112 14111(5/ /BNOOf41rl if N I(114111f5 /11/14/! /(5/ 00/It ,111e11/04./ /f4111S /1115/fI 51(11011 rLM41/00 1014(1055 rNI/lNIF (K 744K 41(/11/ 1451'0(1'053 4( i201/ 11/0Mf/óANVSM144Q ea Aut LJ1578I49-12 loll 140 I/Ir 44 93C6/1 lot 141CtY0 :151 VI - 0015 110 Ct U 017 I /!:/ t1'I/rfM1n N4ed/O15. N N1 0?l g/1 114rs/3 fra 0/C'. vol 0011 _L 93C6/-1 1°12 003 IIH3N,II 1 S10C3 I DA1Af( 1001 C117 INC, II 1.027 93842-T B. RECT. 0000=S 53 A 1°30 221 1/11 KILLER DET. Ila IN1 -il TAI TCN v/rT DNNI f!S/LIIC! 0166 047 a, uQ IN1 1001 CO2 1000 LCCII 3loT 71£ á2100N r 411/r/1Al ((lCu114/ RH28-2K brite AILLER DET. 1001011 CCI31 1008 L--300 RE55-100K vert hold RE56-300K vert lin 1 lut 201 ISV 5030.3% ILIUM 93064-( I/41 107 - C, SAA65 01 Aw Clu IMO Ace, /51f, N1 /IPee, 101, Wee. .aMCllI4C! Y4/tl!S N 1/C Man II! /IOh -= lIOICAtfS C4SS/S Lí0010 1i /IO/C41l5 CSC(!5 Of( 51!010 0141(01011(!I í0/I/S /IOrC4//0 I L1LJ5/2 L000/0, (Ne 10174Lf S!1 A/ car Ac / 411 10i704S S(1 /WHIM NUM' MAYS Oafff/S( /00114110. Mee 1(40/113 l0(141(5 1/fee S/LIAI, 1/10 III! 1Onf SU 4/ al NW 1111I11. r01/6(S 5101I /0/1411l15( 14101250I/01/1112 -1f+021 IOU /01Oaf 2/1I44. HANK 1425/3 /5 CN11C7(0 0//I1I/1 TO Oil S/0! 66'41 /HIfO ,It Oa! 41121141/01 1/üI0I11(I 1121211111,0110110/0 /1! CH10A, CAM 1000 101 IINI ICIS SfJY -0 Wan 40f014.r5r01/11 Pet SYMBOL 0452 "NImc 1000 B1I nova nl UHF AFC 14A01/u01f f41115 1155 /14f / A4! 1112LI/f/11 COI lo ió T LX 1159 330 0084 TCCN 2áT 0016-L r/Y 33 COLOR íñ2 N N 401 01 012 ii 111 cNl,.om 93063-I I NUS.' 'was AWN( BURST AMP ICI 09 ACC 01 MCI 1111 57B145-12 CATE ICI - B RECT. CO/7I 12 1110 IS7I 578136-12 s% 93842-T 1 (5Y LIII 1/Il I/411 L/1 III z II 1180 C112 T 3000 Iry 010 1000 ICS F At., ' 5% V rrIA mt 21 921 INr 1113 MOIL 01.010 02nA a N: N0 file 111 IXIr .02- CII} 14M 01 lull III---.-- 5% um 12 50, 5% C111 390 5% 21Ó V41 1ST VIDEO AMP so- LAVI Cas 127,5% 578160-8 3310,5% 11 5% T.I II C115 1.040 1033 INI S 561 NCR CA57 'TO tlul 1 711 144 1,4r Ill iI CA54 1451150, s% 200 1151 CCl-_ cu 15Oo; 6 IN 10135 1h 40 (IDYtoll 3sr 0130 IM A06l 110 5% 5112 11911 I/O /tI' /10- 111 PULSE4- *A6C03 11 Z0150 5(0 25 51 CCI SNu p,F127 UHF 05C. no 1132 IISE ¡1441(00/01111115311 51821-5 T 1.Ì150D cä11 1 POWER AN IN 301r101 1/If 4W 411001411101 1110. CAM 50 Ilu 100 0110 150,5% 0155 II 0150 C6( 15001 T - VIDEODEi usa IA If NISI 1,1,11// // Lit CATI 22 AGC AMP 173 _--r130 I}Ii 08 05C.LIIf tai 1% 518136-12 ACC DELAY. 03 CII -LT' 93C77-1 s% Ir 1.1287,5t 1"25 1C/71 If¡7 100,1/4l 5 UHF MIXER 1Kt 3k II (f 5041 Ila 150 /5, a 93859-I 1 lue Iü v4M11 'i/AI --+^M-r^ «- 3u I'"0 011lz /511, Say I/Y D3 -ICM 1.411 2445 - 073% 3 RD IF 1 1011115 iiiiiiiiiii 3 La aI 10020 CA26 2S% 150,5% 1/41 !/Y 1,1 1141 1442 if /8411/ LIMITER OSC 04 /n If 93C64-1 TAM CATI 10 578142-4 1427 1424 CII I,01 20 3,0 t73 ITO USI n - T CA70 C171 1/I%l 0/43 7islNs CC 56,5 Ir 14182 I o= //Y IY ulr- ii 410 1131 TITI /5V 2 HT 31117 Y Ar 101 01 148413-2 I Z.I 578152-12 SOUNO IF DRIVER rn SOUND DET, Nu l 10 5% 11114 I11A9 ACC CITI QINal1 o 151°1 111! RIM 141,5% 4O _ Ik23$ CITI IRI 2ND IF 02 COI 5 CALI 10,5% 5% CAN# CA71 PW5800 1120 ' 114r2" ticl III 330 53077-1 470 201C3 I2t°10 1803 MI5 u1113.1010C108 C101 EE 3W9¿«,, Wrrur 5fr I- - 1411: ÓIF NY 2 o° 11 tVl ÌWOt 1ST LAS I I 578141-4 CAI N 1412 TOI Cr1 Cr3 CAS }131 220 ~9 "=..013 42.10 101 IOW 11 100 I r:- 19W . 518151-6 11020 CeOa 500 0802,361 101.1/405%.1/11.56 578141-4 144 CVII 5.1 IMO NNI j 15 fÚ113 Lv22 AFC DISC 0002 1114: V17 1.5 IOW l000 t0 cam 93CTT- 171 044 ro I[AD u05 CIlO 47,5% 11 1/07 AFC AMP Tceo6 IOW Ill -I 511321-8 VHF 050. /5Sv 080`1 I I 1°WÚ 1ilII,INr 5101,26 I27 CIII T -15.,SIY: 578142-4 33081,V411 C 541,1N1 lai S511Ii0 CINNtI 05i eft 80602 13 10r VHF AMP 2T0 ILIMITER 1125 57821-6 f-L102 . 0 1016 11811 SJ CV2i 1.á Cr21 Mlr 27 ,=IIC, s {..l .a CUTS 1t70 F 0803 RFSÉ1-1 NM 93CT1-I AFC DISC LIMITER _4 U¡¡ CI LI CVt{ I C1a MP f con= 1.1 f-4, 22 6MIlICI 10 p_____e__-R 10 LM30 LY(3T -rar-. º--º--º- _2 _ LAI 11131 1=578178-12 11440 EAST FIRST STREET, DULUTH, MINNESOTA 55802 eL R NA,rI,' V B 300V Input RIOpk 18V 'NH" (PW52) 10 PiP Vert R 300V Ripple. 16V Vert "EE" IPWS21 P P 11 B 110V temple IV P -PVerl Collector. BY demodulator 12 Eminer. AGC Gale (391. 5V P P Hord IPINSI) 13 (0201.82V PP Hont 'M" CHIOC AIRLINE 1111111111111 Color TV Model GAI -1 291 5A I E 9 ITN 4. Collector. Ist Bandpass Amp (Q131 3V P P Burst 4V P P 14 IPWSI( Chroma Hora Cathode Burst Blanker Diode IDC44). 8VP-P Hont (PWSII 15 Base. 2nd Bandpass Amp 16 Chroms IPWSII 113141 IPWSI) 0 13V P Collector. 2nd Bandpass Amp 1014) 0 22V P Hon, (PWS I 17 Hont Emitter 2nd Bandpass Amp (Q14) Chroms 018V P P Hort (PWSI) 18 I AI Demodulator 10201.07V P -P Hont IPWSII Emitter. Rill Demodulator 10211, 0 9V P -P Hont. (PWS I I Emile', 19 133 B 25V Ripple. 0025V Vert. CHI4A P -P 34 AGC Pulse. 28V P P Hont .'P 35 Burst Reymg Pulse. 11V PP Hont,"T" IPWSII Plate (Pin 36 (PWS2) 41 (VIB), 1150V Vert Output P -PVert (PWS21 Cathode (Pln 37 (VIA) 22V 9149 Output P P Gild (Pm 6) Vert Output 38 Vert IPWS21 (VIE). 10V 40 Plate (Pm 2) Vert Osc (VIA) 80V P P Verl (PWS21 39 PVert (PW52) P Crrd lPro 95V P P O) Vert 030 Vert (PW52) I MAI. 38V P P Plate IPIn 11 Hont Osc Control (V381. 57V P -P Hort 43 Gnd (Pm 21Hont Osc (V381, 42 Cathode (Poi I1) Vert Osc (VIA). 60VP PVert IPWS2) 41 IPWS21 Horro Cathode (tre 8) More Osc Control (V38). IV P -P Hont 44 IPWS21 701 A 2 C12 141111 DII{ 150,5%N 93C39-13 0121 .1T ZENERREC. o//l 51 1/41 93C17 -I a1¡4 RATIO DET :io, NIT 01710 JIr 5AUT SS,s% 1107.CE7/5% DLM/3 DELOT LII( I 1E30 Luz 2ND VIDEO AMP 12 12 V2A 10 116 1035 3.31,101 CITO I«51 93C64 -I *051 11500 1 93064-I 5K BURST CATE xri 5% CLAMP 0030 IC25 6 BANDPASS 518443-12 1ST BANDPASS 013 518144-12 2 NO BANDFASS Jr C172 T 1000 01 6002 COLOR n CCL CCU 1119 6040 I1 400 Jr 5% 101 11 1/41 Ito 1E/0 1746 1/46 330 5% .578159-12 BI I//6 CO13 iSi 1,C115 COLOR AILLER i AMP 016 116 0040 1/41 2200,5% CRYSTAL 7045 110.1/47 0ír 5% 310 5% 1031 5000,, 5% REACTANCE CP45 ADJ sae 1047 57B159-12 3.58 MN. 05C. 018 3.58MHa BUFFER 019 1x4, /01.141 4,4, Co77T Mt FILTER CHOKE C11101, G0/0A 100urI10x1 _ SMIG 1169 6r41 311,21 GAP CRf ro1 rAI 1154 311,101 311, 120 1/41 Ix 610 + 35orItl t 9n o9: C` ¡ LO C/11 /0,5% 330,5% 0BERDECAUSONi VIA 3ECT. óá AC ( ( .N/CNI 5% lppyf 2006 93C97 -I I 1E 11 BRECT. T0E3 ORI »3 1000 73 DAI III 1100104 04 Ott? 27101 02 VI Mi = (Is VERT. AE53 ILI.,r3 _ - 44 51x ,,,3 Ih21LU8 VERT OUTPUT 3006 roo 0 21~- .311 11[0 1676 1754 1E15 391.21 IN(C NEC 20011 {., 2 Ì$511 11 IEll ER!. 211E IN. 5% rurwror r01 WI rar tr2 47 5% (12201.21[0 7 o aaar_ 0 I 1A _ 0T 49 Burst 8¢81rO Pulse (H Pm 11. 11V PP Hont CREEN RED SCREEN SCREEN CO Vert Convergeoce Pulse. 6V "C.. PP Vert IMH1051 330 1013 .20 027T C11151 AC v Ixt il' 87 R1173 If L C77 '112.5% 101+ »or '171 4001 CM 4700 HORIZ OSC. 431 1101 V38 { p 30,2x, fir 1020 000 1111 9% 1130 Ir27 ICJ» CR2 1.31 13213 T.22 A4 o 220 9% ' 16r x u0I14001 IRI 56 1 O C012 26 I CC r x° U120,5.1 x,n HORI2.OUTPUT V6 1R1 00100 11001 2.46,71 3503 3501 250 á%.11y Irlf Or. C.,1/ tl u op -F n DAMPER A5 6M03, 4 I0.,22 ARNS , T012 10,51 HORIZONTAL OUTPUT CA620 Y0I/ +ñ 444 LMI/ PII /NOSE I rr¡ r :: 9755 /11 180xLA1011 xC. 1E0 0111 1049 1 lYL__-. I 11151 6111 CAIL5 71173 411 I 1s 4 TEL 40a COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 J! 11110 7141 11112 11149 0117 l0 i OUTPUT ORC -I(-ax 047 /00r t II L 0! IIY N11 HI J 11 JR41 EAST FIRST STREET, DULUTH, MINNESOTA 55802 3.14 COLO Pr11 J1149->. AN31 210 11157 DEFLECTION YOKE 11TH 0341 »066 PLEA 016.,151 1M60 340K3 -pm 3slws o --, ! I x61C Ifil-- o 0 g.,72 1.10027 xT I% 5% ADJ. ttHORIZ u6.16 I66r II %ur u _ TRIPLER AR131 1E23S T12,5% IRI40 001!10( 449x00 L/24 Ts 12x TxH 'CRIS? _J CNIi7 101 --,--_'s% £ 271 Os10 ,RISI S% 3500 1901 5% GN133 221 6-3_ Cf16 S A 5% 1 r L_ 1{ 0631 1732 CIS ON I 300 ADJ 100 511 3% i3-- 6LX8 /III 1617 1CFI 1" 00 I 2001 -7-1000 5% 1`41: 171 xx 8112 #I In JNY 4111.1 0(30 1/2 BAICNTNESS Ix 1001,11 IIEC 0P4* 58/ CE51- 31 V3A 1713 DETECTOR T 6E22 1.41 0.4IEC r_ 1rn HORIZ. PHASE COO C 1[!t C ,__I SIE1 BLUE SCREEN CONTRAST AMP. 1/26LX8 nt tt JOr 1503 II I IX? Ino 1612 ISO VAC 50 Isoo 466 1[24 Irr AI61 SOUfT ilrl MP ,1[76 1177 1511E1 IA7 HORIZ.OSC.CONTROL AEII VERT. 1E54 C ;1500 1E11 4 VIB C[25 cr65r 1000,- ,C2000054 I CU 2.311 L;-!IY c-- 8ACIOA -Y ill lt(9 0(0 .10(10 NM c(u1CFeI)1 T22001SiYSt3lY 1fC I(56 1.0 NEC, SIZE r 2.2 ANi! 1001 COII .022 If12.156 ?51 2.21tc{ HOLD rllr! ICF/S S1[591 cn2 REGT CEN - 1.041 93091-1 8 CÑ OOC 1(15 CE AEH '01 71 oA0 .1000 CECO 102 - B 1t -rr IRy te I SPAS' IJOr 3(-0 5x COI/ T150,5% r/r 1/2 21LU8 VERT.OSC. Pm 21. 32V Cr53 V3 5(70uv I StYr 10x,150 PW52 T 312T 1751 1206 3% TIMT 6X34 0115..1 0 Hord I 44 5% 5846 -q 17 I{o 2701 ACC Pulse, IH P P 1111 VI -210 C71/ 1151 1f19 48 O,rr 1.21 1150 /rJr 0r 400, 260 5844 I.x ss0r 41 ytrr 021 `:. 518143-12 00 I5% 1011 400 6531 220,1/41 Jrar 'I 15 578159-12 //rr CAI SMAI ¡2-OI0 N C147 510 srm :GAP L.f.1 lu rJr c04s //r tr P AMP. V4E1 2106 r NEC Ix 3.58414 220 0032 .01 -T C n Au IIfC 311,21 8ACIOA 0043 1053 G IE61 1151 1rg~ 1052 5% 8AC40A -Y AMP. V4A RI DEMODULATOR 0033 V3 I'" 1.0 lit- 16E0 R C173 CO51 I(A11 JCIIYMK7/. DI 6546 1035 3.0 ciI/ V3 13 IMH1051 rf/rr Yr 220 10159 5%7 100 T 518M6-12 or "B- 1-2104 1200 1051 01 TM 9 NG IJlr fir 10163 f II11,17411 4 3 IMO 7062 50640 51111 CAP 0711 5811 DEMODULATOR 020 1023 411 *3rr16J/AOYA/ 101" - / V28 500 6046 1C5í 1024 151 Al LA 1252 1E43 47 544 SYNC AMP. 01 COSO PKIVIIIWI I II 0E44 1hIIAF9 111119 1024 3.11 1 JJ 110 100,5% 106,3% 4.76 1330 Hont Convergence Pulse. (H.0 T Pm 27).290V P.P Hont ;19VATP22 580 /CH CC/1 Ct21 ,-'-,i 1LU 12 THY CM /./r 101,1/11 47 III SUM CEO TEL I 470 -210( oCu /Jr .--.. 2 7n/01 CC SPAIN GAP BURST BLANK 014 Atri In 4.71 + TEL/REP Cc !SCUT REV "MN 93C64 -I 103 1025 trar I «, eia r d(Y/KOOf« /A/J 2Nr- I.11- I0175 «GI 0WI. PI 4MMOWIII11A Milli 01r077MOrM(gt/011/1(oSaito Bh 11AF9 (-- BD192TOUP0 022 L16 62 47 COIL W(A/S/rA 76LM4ff/S VOLUME 6442 506 361 Screen (Pm 3) Mont Osc IV3BI 58V PP Hont (PW02) 1.2 ONE 710129 334 CIt1 46 I SPEAREA VOICE 150,5tA--3. III ,P 16X( CR1> 06 0125 B AUDIO OUTPUT AUDIO PRE -AMP RATIO DET. 7120 Plate (Pm 61 Hont Osc 71331. 240V P.P Hort. (PWS21 1444 /for 516153-9 93C1T-1 1SO1s% 45 IPWS21 34.,152 or 6Mx< 251(01 901154 t I L J 1NIIEDDD$ }OING i 1585 TRAV-LER E Color TV Chassis T41 K10-4A/B MAY V-77=/y SYMBOL 1975 COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS R H 103 11111 PANEL -1 K preset color RH104-500 ohm preset tint RH117-350 ohm preset contrast RH118-2K preset brite TUNERS TO 75A101-31 75A101-31 75A101-18 75A101-35 75A95-18 75A95-18 75A95-18 75A140-25 75A140-26 75A140-17 75A140-18 75A140-19 75A135-52 75A135-51 75A135-54 75A135-53 RE56-300K vert lin RH28-2K brite RH29-350 ohm contrast RH34-500 ohm tint RH39-1 K color RH42-50K vol/SH41 on/off switch P1a FRONT CONTROLS THIN RH125-5M high voltage adj LB2-coil4.5MHz LC16-coil chroma takeoff LF24-coil horiz adj MH57-deflect yoke T13P857 TRAV-LER PART NO. DESCRIPTION RA82-2K AGC delay RA83-2K AGC RC84-10K color kill RD38-400 ohm react adj RE54-3.4M vert size RE55- 100K vert hold 75A135-57 72A317-1 72A329-1 94A351-1 94A379-8 94A379-9 72A318-1 72A325-3 72A327-1 73A31-16 80A108-13 79A169-1 79A141-1 79A 165-1 84A28-12 84A28-16 94A462-1 94A463-2 deflect yoke T17P877 TB20-xformer ratio detect TC14-xformer burst TC29-xformer bandpass TH2-xformer line choke TH4-xformer power TH18-xformer horiz output TH44-xformer audio output TH73-xformer vert output FH5-fuse .225a chemical FH27-fuse 2.25a chemical tuner UHF tuner VHF M.Y. NOR12.OUTPUI TRANSFORMER HE54 RESE VERT VERT VERT MUE UN HOLD SCREEN SIZE 1E55 NEIN 1521 AFT/ HURl1 GREEN 4178 SCREEN HOLD VHF TUNER 94A463-2 RED SCREEN ¡ `I PNITIN r1r DIANE MIPS T TM111! --`I 1 _ 1 1rd91 / ! 2 SKI n CM"-IN f CIT! (Am 013 e r1M, 01attl1U u, EN vb . .. aáEirT T, Mr row .. w ) o SYNC IN 1-1 (TS rA AM NMNq AN ARP MOW 0111111 I I , ANL 130 A-R/ SIGO 441, 1.511 411 A NINO. rear "ti 1535/. POWER Cr2 1000 1020 101012 5VP PVerl IPWSII 2 0255 4.2 N/tr Collecl0, IstVodno Amp 1010) Vert IPWSI) BV P I 11115 God (Pon 51 Hord Output 961 210V P P Hon/ 'AB' AICI (P102) /O CVI CR :ors 110 o IYi NV5 1 2AC1 If TOP R 115N3-2 @IFI. TO CATCH NE N Ili/ VALUE ION Xe 1./I1 IOC N3± 7!r IH1 1117 011101Z 111Z 1151 I MI Cn0 IO 1119 0011 T lar 21/ IA 578136-12 SI ACC CATE 09 /70I 1A/S ñiIw.31ACC ACC AMP. ACC DELAY .33 202 IA1 Mt I, CCI- 100,1111 RISI 1CtlS 11 571136-12 57B131-1-112 CNN /¡Y PULSE 1455 0T 09 r/ MIS ',Ill II POE1/2. CN} ¡In ILK /N SKIP. Of 1/If OIII IA` MINIM $/ILI/I HI LN/(CIS TO NS/MeIMPKL/I! NI MIXER VHF NOT AFC I- .2N1 1127 i°Fr ,50v IN, : °Rc ói5 N2r LIME FILTER Nu AC T - 1 ` RO tO sm., LIVE 1021 RED /MS FUSE INTERLOCK c{rr Id NSE 93B42 -T B RECT. !/r IC° 1C1/17I 1 I /'r MI N ./ 1000I NN L 0 10NT N 93941-T 9 RECT. 0015 1 0 AANPK lU IQI11 bVl'P POP w re H ... 1 I CHOCNIA IP icsN1IP ter 10 I(1221 B 300V PipNe I 69 Verl "EE" IPW521 P P yer EPF2.R-YAmPOuIpu11V1A1 ,1433} 93C64-1 150,5% 6.11,5{ O C1TjACC Sx 03 "'V rr L /r 110,131/ IC 93A59 -I II B 110VRIpple 01V PVerl 12 Colletto,. Qemodulatc+ GMIe 1091. 59 IQ201.82VPPHord "M CHIOC PWSII 252 11 IPWSII 3 0130 ISN 7t X15.11, Base. Sync Separator 10111 71( P P Vert IPISI I WW1 PP Vert "NN I.01 CI52I Na 15-- 93A63 -I UHF-AFC By 300V Input 81pp1e 189 150111 21 .1 CM RN' L171 ci Ir CNS I22 UHF OSC. 9 YY kNAß CA2N 201 C7N 1eN.OII 22 t{ oR 1,11 CAN Of DEC 6 II CC LIN 2NUMFLIIE i///iiiii/////////////////////////////. -I 1.121 1141 "If O! OM %deb jig SSr IAr DELAY C15a N: WI UHF TUNER 94A462 1 - um MIIff. II: Sl1MCf/!1!/AIn, ,..i.....,i.....i...,/......... INIf 5.11,5511500 íC172 11040 L____ LL]11 r _lis INX/p-ga KO Ió L/. (111,12,...4/..1 INI OUTPUT 21.0% CC 131 I.Ir 40 NEI DIN SELECTE11311 300a1 If ill IA1P EE Ng 5NT I CÁ25 11127 X23{ NAN 1.21 1 Hr ttr 55 " wp SI fill /SP HOC S -51 15001 PERROT 02 CAN 2 21 r LASO X13 57821-5 Plate (Pen 101 2nd VedeoAmp Conlnsl 1009 P p 072111 50 Vedeo 150V P P BlarnonH Vert GG IPWS21 Nr 01 61 2 MD IF II 11112 oNj OS 578141-4 1111 1251 5 nA IAItt CAI CN rn1t COE 220 1502 KC NE NR NT.1Nrí 3 ST IF LIE ° IEAD P.M Imo Wit." ism I CAI 055 IÇ214 Irl I SC/IW/lNI 21 dhCobr.250VP PHor, (PWS21 Y Amp Output NICI mdnCola.I80VP.PHOrd 1P34. 13 ao Nye 2 CNS 5510 518141-4 Nu 11, 5% IIPH VHFAFC 113 -.P.m, ar I IPAO. Sound Deter loo P P Vert (PWS OSC 054 I(_ CRI CN f 4MF 0 c x I,r.V.,. 51821-8 114 1M St - CNI 11 IbOAg Mg ho In // I NIES INNS C101CII .1NI 5.1 711 $IN+ 0400 510 M113 1511 1 PH] VHF LW! 102 CIIS.MOOI SII 51C7ß6 1 IOW --- 1 © TT 44 sn If LO XOMIryOSC. 7 nn III1 1807 1 //r - TT CrN Ils 0535 111 ¡ _ IR 1 NIT.OSC o CNI. 93CTTppf) DISC IOOO ! 1í20 LN 0901 NB rN i1 rT:N. RI A11 WIZ 44E 111N j' I:' Nxa Tp00Il0Op AFCAMP VHF MIXERS NA,INg 0-1 m SIR REIIIrF COI U 11 IRO IN INN SAP S cNIRM1 0551 rNIN RAN 202 VHF AMP II ..CR2 CRS /1.1A1 CI+sL..-.acM: q ISO 5 1101 ISO 518142-4 o1M 57C1445 Nero Oj e lall 12 CIS 2H Cºw1 c. _mg1ió5 nR LIMITER R0901 I Si OXrW ó mom aA I nlE N LIMITER __ C107 93CTT-I AFC DISC. 10903 MN KlAP s.. ! T SR RHVOV p3r 3... C 51821-6 eviti . Tr. eel": MPS /ercl,a/Ar *If MI ... 1_ S 1 WHET TNnG LN1 LIUDE trail, ti nAAI)IA r[ur2NAN + __i¿__ - o_ Jtin. M`T` ! _ Ir 518111-12 518118-12 IIN 11140 Zia 25 IPF3 G Y Amp Output (6181 meth Color. 1509P P 26 P 15 Cathode. Burst Blanker Oode I1)C111. BO P P 16 Hon, IPWSII Peon, 27 -Z-IPWSII Base. Non/ Blanker 22151. 589 PP Hard (PWS1) 18 BuntAmp)Q121_ Hont IPWSII TPCI. Bas,. fiV P -P 21:1 Amp PP Hont 17 Collector. 2nd BandpassAmp IQ111. O 279P PHorº IPWSII 18 Emlilcr. 2nd Bandpass Amp (0111. Chroms 018V P P 19 Hon, Emrxer. 1020). B Y OemoduI,lo, 07VP Einelter IPWSI) 13 I- 20 P Horn (NISI) Demodulator 251 Collector .RYDemodulalP 21 I0111.1 SVP PHor et IPMSII IunctmnRF31a,MN16.2.29 P P 22 TPF2,NYAmp0ulpat(9lA). Riefler .90VP PHont Hord (PWS2) IPWS21 (02(1.19VP PMort (PWSI) IRE 29 Collector. BurstAmp 0311). 459 P P Hord (P9101) 30 3 58MH, Butte, 1019) 22V P Phon, Base Collector Collector. 3 58M11/Osc 10181 119 PP Hort (PWSI) 31 32 Cathode IDC191 Bunt Gate D,de 1259PPHord (PWSI) 33 259 RIpDle.00259 P Ved .CH1IA BY P 31 AGC Pulse. 2BVP P Hort P- 35 IPWSII Bunt Ilene Pulse. Ho,,, 119 P -P P41e (Pen 4) Ved Output 1111131 1150V P Vert I P W S21 36 35811H/ButlerIQ)91 23VPP IPW52) IP1VS21 Base. 2nd Bandpass (111) Chroml0 139 IPWSII ChIoma. Hont IPWSII Collector. Hort B4nAeI12151. 339 Hon/ Collector Is18andpass Amp 10131, BV P P Burst. 4VP P I/ 2011030 T44r undtei ] SOMIT ButlSt (Q191.2N P P Hon, Base HOES 020 300 021 (PIS1) 37 Cathode (Pen 91 Vert Output NIB).22VP-PVerl (MS21 38. Grrd (PIn 6) Yea Output NI131. 10V P P Wet (MS21 39 Plate (Pen 2)Vert Ou (VIA). 80V P P Vert (PWS2) 10 6,8 (Po,10192.1 Oo, (91A). 959 P.P Vert (PIS2) 11 Cathode Ohre 11) Vert Osc (V11). 605P P Vert (PWS21 42 Hont 0v N313I Hon/ (PVIS21 Geed (Pon 2) 38V P P 43 Pate Ihn 11 Hau Osc Conl,ui N3Á1 579 P P Hord (PI'S21 44 6V P P 10,,) Cathode (Pe 8111001 0. Cool,,) NM) IVP PHoret (POS21 COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 15 P41e(Pe6) Had Os, 2409 P -P Ho,,) 74381 IPWS21 46 Steen (934) (Pm 31 Hort Ost 58V Peen, (PWS2) 17 Mo,,, Convergence Pulse. (HOT Pen27) 2909PPHon/ no B IMHI051 EAST FIRST STREET, DULUTH, MINNESOTA 55802 08 AGC Pulse IH P P Hoed 01 Pm 21. 32V 49 Burst Neying Pulse (H Pm 1). IIVPP Hont 01 50 Vert Convergence Pulse. 6V PP 9er1 "C 1161051 TRAV-LER MODEL CHART Color TV Chassis T41 K10-4A/B MODEL COLOR VHF UHF CHASSIS T13P857 Walnut 94A463-2 or 94A392-1 94A462-1 or 94A466-1 T41 K10 -4B 07i.c /IF33 /K1/1F 9I(/INI' 109/(,Uq1 M[/(S IK /iM'1{i, III, //IM!!. (IMO/1110( MKS / K M/(I!0 AK/PM flNf/MRY INKS 1135 (M/I / AK II #1, //04(115(1 MKS Of /I /M +/ICRI/!S 11155/3 CONK b/00/CATES CIC/lS /(0 WOK K /M///YS I0/ KA0IK0 I/1I r/00 /1111/ 0111(!/ /4/I/3 /10/14110 I (5435/3 OMOIO, ¿III 101111! 51I 11 COOK I Ili C01/11J KT III MINI NOOK 001155 01r/II/3( /INCR((I NM( 0110/117 15(11((/ I/'NOLI 5/1511, Ill71rIl10111 111 A((NOZI MOM. *MKS 350K /I K111/5 I 1511 IM70K0 I/IN I(f(/r10 /0100 101 00100 1/1I11. /111184, (0J9S /J (KK(11I N1(0II1 M OK 3/K 11 K NI101 /K LS! 11 /S01I1/01 101117011(1 WI XO//C/K 10114/0 11( IMCi/KC/!Y K 5fY/KNII ![((INN[ SAW I II0I11 N 1151 1011//KII. 1140190 1511/K. II CN I7 0443 01.3 In -I 93C64 DIN cN1+k:I11A 3301-¡T'` 10,5% 1431 101,5% 1111 INA 5% 11 .ol 93C11 -I 03 5M Á4f1 101/1013 C0K(1f/ /KKN1I1(1 IS VIIIVIII0II(/ MIK Ir LA9 CA/7 0150 0453 10 10 25 5t- 5% 0451 270 ó1 C 1.4/1 ** -.. 101_ 11- jl co 1012 012 10 1«i 61 um F -« )I CCI Il - 1010 110/.01 1000 1/41 101.114111, CIM 211 52 N COLOR KILLER IN Kea M/5 sr COO 93(64-I N TIT AILLER DET. +ÓÖ -.- I.11 10n UI 00,14! 5000 PHASE OUT. 0011 101 INC TCII 11113 BURST f - ¡'330 Z L 0017 - 518149 100° 10 15;COLOR 121 INA //r DEN 00 co:: Ill! 1034 CONS J1Z Z.22 220,1/11 1111 ASST. A8790-3 wF olr-->rT- RICH? R -G VERT. 1.011 RIGHT !CLAMP -iH rs «2T 110 BLU REACTANCE e .l , R R III. I3 i IR -C c c _ono 2.15 51 VERT.!'-' 101 1 tt I IC + 1371 ICI 1NOUN 150 =12 0 AI COI BAL 501.11 Isl LC1/ i" BLUE COBS .,orZ ¡T-- F PWS3 fi C(11 39 WO ,t 3" 1070 Lwp 12 OSC. 3.1.5% 519159-12 110 va »w /t , Nµ 11111 II Hi 041 _ 111,5% - 0113 1112 ISEC SPIN RFD 1 41-213 If 71 1,12 BLUE SCREEN 311,21 cru 1130 2781 TI 41 IN/ 500 SCR Nn /Kr 311, 211 11 -Yi CAP i D43 r;(7 B nee 3088 # IS V 148.5101,5% vp SUL 222no,no, 01113 1111140 101.1182 1001 HORII. PHASE I VERT OUTPUT 111, ±i11[27 121 CEZ YAW 41 31 111110 NO 120 15, ss 10":113 11/13 DETECTOR 112211118 017 RECT DE72 Ill tor 9 /NI 3101 5,6 m NOR it 0135 IF SI 111 1/8 31 LIN I 110,51.21111 11111 301 It 31100 HORIZ 18 1 ADJ MIT 131 AC FT If 12,5% 381W6 1121 IV 121,9 111 3401(3 1315 1 HORI2. OUTPUT 11 liot JO VG CLAMP 111133 511 0021 1111 RE22 14100 lome 11138 5% 1120 IN 1110 13 III 1102 IV 1154 1111114 11030 Z3»8 1111 8141 NUN 1114131 221 INN 1iÌ0 93842-7 HUNTRESS 13 1311 1111127 01 110 400/41 111715E15. vv, 4100 3A Not 0113 NIS ht HORIZ OSC 1124 INCONTRÄST CON 81X8 1/2 5 301, Off ICEI eHnis IW 'zI0(1"11'1 11719; 'pro ADJ V4C O LI, I'M 8RNESS 511TC0 5111213 332 DEI KM 101111007 11010013 1111 NM 11 IE/ MP It WM °Inu no 133 YIECIgI PERT. OSC. 93C9T-1 WU u 4101 SOU MIR 8AC10A 81 AMP I BRECT. IOW 111711 5 NEC SCREEN EN 1373 1E15 11E1 1-117911,V121E mi. .1171 _41 5 NEC 500 1/3 2h 21LU8 1177 _531 klamo47 4014 ISo,sx * cI/ nit 0111g GIP ON L5 NEC 1.21 LOA 41 PWS2 GIP 1151 11012 T .01 .22 51113111 ( C051 lN, 1} uct3 10 WITCO mob x SAN OA um 2101 Jl 331,141 Low 1/3 101 sus 5911 hit 100 Cori MOM far SPIN co 1 021 ron IN 3.5611X019 UFFER 40/1,101,1N1 I!/ -Y DEMODULATOR /r 1111 1111i.00 518159-12 R /Mr RV Cill 8AC10A 11,51 253 Kir vo ÉVÉÉ IJr loll S% 5, 311,21 541 110,1/11 110,141 nfr V3 IS 1.1,110110 15011 INC 578118-12 CNN 1013 s% 93C9T-1 AEDI RN1OP BLU ITRIZ. COILS RIM .01 1340 COLOR SWITCHING 11 Ii< 1Mr P -G 111,1' 11111114111171. 11011111171171. .9- 1113/ No n1 1 HORIZ IECI011 5171211 391 11,31 ID9 Ili /EM SYNC AMP. V28 SON (Jr INN 1NIco73 300,5% -¡-11 MNI ds 3.58 018 151 .1 Cant 1111 ATOR 141 1141N! TOP -BOT. VERT. BAL BLU 511113.11 B -T DEMOOU 8-1 020 IMI 135 IF 1E7193C97-1 IBRECT CMI COI 111E-S4T 578159-12 1013 1141 578143-12 IRI u v1/ CON 3% CIII 510 0rrl I/ ts 1110 c.s SII 141/11{ 5f Iw HORIO. R-C IMI. COIL TOP -BOT. XORIZ. -C PEAT. T VIII" 1154 .I Ioo own c1M/ 3750Y Nt5% Lim a íC45 11 o PRE-SET COLORI 1100 111/2 01101 511.11 41: ES cm 110.5%.1131111711 SE TS 11 470 5%.4118111131/ UT% HORIZONTAL OUTPUT OM J-III VIEWS BOTTOM OE CALECTOK *5534 u 1111 MIKE 117 41-1047 I, NISI NII TRANSISTORS 11-0*01111 0504 111E API) TIN OP LEAD 571141- *51 VERT TO 10157 OUTPUT 42 111111 DRELECTIOI TORE L 130148-11 E 11111E1 522 3 COILS 1a 411. 211 TIN I 151,152 111 571150-12 R*01IC CASE EI00PT Ill T Il, IE,13 11527 504M C1 TYPES 51 »INA 001110011011 i 0. S 155 rn 01411 SOWN 8170 COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 Wit 11111 VT JJ 11 12 SAM -¡-170 IA ' ccOs I1r o 025 1°52 1.0 451 /Jr(/[ Tri Io 80í.B141 LEFT FILTER ÁC12 I .37 470 21 1110 LINE /1/ INA NOV Kr 1.11 10/1 ITO DELAY 11 11 110,3% w 72x5% C011 yÌCH f lost DECAUSSINCF lift COS ICI í110 11 MORID. LEF 93842-T I o III MK Ares /OP C011 NO awl 3lSOÌ «N)_ tsr =1 Lc2 2ND VIDEO ANP. V2A 1(35 00 T0 1054 75 6{3 III ?- 01 roil 105 aIC050 3w, sx H ir 4' 1T3o 7:rosi 1i( 3 II 1/11 R Aft ° 1(4051 -I SII 1(13 Cc31 *//MI«II 1031,11 Icon CNN AILLER AMP I4 93C39- 1105 C11! 014 CCN con IN1, 00103.5BMN,CRTSAI'N; LIN 012 Lur 022 1033 1.22 con rr PWSI CCI 1/11 016 lou Dil !/ 11,141 12 REACTANCE CO2 ?OM 1031 -; O/ Áo21 151 CONVERGENCE 10 1 141 AV 518146-12 578150-12 CC121 141 COs 3.31 ...I I/1. C013 1III 03 IC 1C21 "03IaN CCg1330.s% 11 93C64 CCp1.IC7/ 111 vrrr 41 r1s1 Sax 3wÌ 41./.5/.1' lax AUDIO OUTPUT BURST BLAIR 0041 101,'41 -- 1024 (Jr en Z01 PHASE OFT °132 1CC35 5400 t1, «s2 01191111110/1111 [2111 578192-10 1004F *- ND BANDPASS 2 101,5% C21 518148-12 I IOO,INA¡ 518144-12 It1I IT ÁC20 5171 NORIL BLANAING 015 1MT C131 11111111111111 10 1114595 TIE 101125 I 10/ 1135 140 :11115/11 1E811 -I IC31f 011 INA CCSO^ 1/11 93064-I 1011 110,141 I/ii 1N0 nod CLAMP 3L 013 SYNC SEPARATOR 121 rir 010 100 I III m 110 5181311/2 # + _CON 93Ó -I 101 /011 .M .017T -# 11,5% 1012 2200 -^ rc TU-- 1$84 LOOT )I 1134 IST BANDPASS mom C111-1.-joy001 C40 III! IN! IK I INI '120 BANDPASS 10I. Mr 25 104 SN 0015 IN! 1000 CCl/ 1.01 3N; CCs - U1 110 001 IU / ISI wN 1CITO 1,11 141/11 1130 1001 CClll 1/1:3 ÿ¿! II71 11112 HI. «n 311 20311 10 117`Y.1/ ¡1101 1/411 IMO L2 NAS /r1 121.5% Sol 93C64 ro57 53 11300 BURST GATE LC11 i.00,1.% 1111 93064-I 11 ICI TPN `130,5% 2 1I 518143-12 MN 511... 0011 17 1tCN 93C64-4 5% 330 KILLER DET. ILS Cc2 cois 7 111 BURST AMP 411 Oi -, rA . TT 1151 i52 518145-32 tlw - IY/ 5%241 INl «N 1.01 351 141010 -48 I3VA EP22 13V 50[1101 06 3!1,1101 33% vr Ill,% C INts+l, } VOLUME NUr c152 1iA RATIO DET. 0111 IC IiSY Io01 5% 93CT'7-1 ZENER REG .1 11y /00 /Ir 12 111 U -I3 ! 1/11 ;IV OIH 130,5% 93C39 Nn 1 Cl! 311 1121 f/11I 230 CI33 --i 33 G2 1 1545f N751MY/M!/OM40NM4 SPI 111 C112 I1l,s% ITSNN iR M P IÁiI N11 TJI N S1 A111 LWs0,s% AL/f IA /n 1/I1 C151 1141 2501V -CIIS III' C113-ISO.S% Ta,x5CIN C101 1101 11411 U, A 0% ! O0I (110011.. PIX TUBE SIZE PICTURE TUBE TYPE USED IN CHASSIS 11112 AUDIO OUTPUT AUDIO PRE -AMP. C1134 [110 0(K0(010// 11 (/KI 10/ WAY 01101I000 1144 reds 518153-9 MK' 0001101,015.. 011111111101 104411003 CKNI/10 Iµ2701 1KI1/II O. TO "°' Iy (I1115115 I/ I11 IS 11[[ I1C15K115 /I0/CIl11(Y AIMS M 0 /1I/IKO, 14 A 010 1fr RATIO DUT. 0125 TIM 1 MO,VIy IST VIDEO AMP 111 93C7T-1 1/11 51B160-8 " -, I --11 210,5% CAN 150,5% VIDEO DET. 0153 3 RO IF B Nr ,x 1N LISI 100 uoIN 140 CM5 1111 C1110 /IY $0 CLAMP 518142-4 1/r 75.81.115% 111/ UN,» SOW 3113 /Ir OS IN CM E .MI III AIIT /"/1 /I 05C LIMITER 04 A - 519152-12 SOUND IF DRIVER 93CT7-4 SOUND DEE man, Ill nod T41 K10-410 / 518151-6 0 II MI 1011 MN. *WOK II11KK 01I 94A462-1 or 94A466-1 94A463-2 or 94A392-1 Walnut T17P877 /'II 10N0 IOW( M INKüIOK, 00 K/ 001/11! 11135/5 //C/0r! 110! N( O/SCOII(N!0 1100 (515515 S31 01 KM 1II11/3101/5). 1011 /3) 00 11101 1100110 0150111110. 00 KI AK 110 4104( 1110 10 C1155/5 M 7/(101! 10I( 0K M 011 1001100 L3! lloll/0I /01191/1 ACf/0(1141 11011 1171170 COON 1171 1I1/1113 Ar 10 15535/5 10010. 0001 .1M1 (IC(5S/Y! 51/11011//3/3101 11115 00 K/ LS( I000NI4N 00000I1/ II5/r1I /(31YINY K1AI0(0(11, 1'1( I/r0II0'/K ONII1 EAST FIRST STREET. DULUTH. MINNESOTA 55802 row 1 10 1511 5311. 1586 úa ATECHNICIAc ELECTRONIC ZENITH Color TV Chassis 19FC45Z SYMBOL P237 -15M focus control R416 -3K AGC delay R717 350K vert size R718 -2K vert center R1002 -100K color threshold R1015-20K auto color control 160-4011.F.ß 4 T ITA .110 ARC uNL[IS 1\ SPECIFIED. .1L.IP044101 223-00 I 4 (LEAD END VIEW) jpN.OV 0 I4 1NP1 L U12 U Cptoa401 63-9697 S-56875 95-3080 95-2925-02 S-96473-02 95-2789 85-976-02 T202 -power choke T206- horiz output xformer 19FC45 T1101- quad xformer F201 -circuit breaker F202 -fuse F203 -fuse 136-29 136-87 1 YºI-91 I IIO.Tv Q I OCR 47,1 1a21 roö ! 121-501 VDE -Cr INC laH 10 3p I\ 4 M I , 001! O XV Pe 16.7111. O Oish Vi1--1 .e«K j tSlr LNPJ 1{.75 KW O 111V yTOJ[o0-3 Pe 15.75 ION i' Y:' , I i ® 1á ® INN 30V Pe 16.75 R. IlV P1 we 1{.7{ 3440 1.4 PI KN 45-11VM >U. 8401 -fr4 110 Pe 11 Kw 1475 1Z coas 3 n 'p` 1" r.: p,_ aro[ :í ro +w Ì1v 24v iM tilb j rl VINT. Y2, _ 4'1 INOt ! KM 14.75 RL ....<. .1177rrt ua r16 uu. .óó1 íi% ÿZ; Ios 1C1114 ïi2 /+)!V +1]OV 0104 4N 121-986 KRININProR COIL l.2SM T lü! t.:l rwI cuot A.rc - v- -u0117Ui UI _` ióa 1+ fY.!I* 1 , 4ttf1 { I U2011.1114 411333$1115 4 --IV 2w r rIn Or I 01614 cnT ;P Ó1 1{. RH3 6.75 rg. Ir10T[IKONV ! rAVN ;.75VP!KM2 ? fit: I 4M' I 0i ---- Iaroa ! M25 KI 0101 44 L LI 10 CIl4i a.rv Lp= RI40 WI T! C{ 3R0. l.F. II.ry 11 4 I 5+ 0102 121-624 lk J fz I R10, U 4t4V úI: CRM I I ,. ió C 1 I 82 Nu 14 ---1 I Imv - A.5 árII COIL 4 Kaaov uv .VH e1ro1 Jla1 Kay L105 000 II 102 U10 SOM2 45V RM o QOV 111111115 ® ew igr1 2 I.0 3 I,x IOI le I:I«Rpr. tW I. 23111 O Np! NO C.MtV11S11 1 V.14. F. I.F. INPUT P200 TUNER PLUG PP 416 WETT OTHERWISE -e POLM OUV011.111U6O IN I NV 11 RUMORS ALL 30 111. 1R0YR !!! -20K auto phase control L204- horiz hold coil L1002 -chroma take off coil 63-10276 63-9697-01 63-9697-05 63-9697-06 63-9228 63-9697 - COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS R1018 63-10141 1975 MAY 1V01416 ZENITH PART NO. DESCRIPTION R234-50 ohm brite limiter control 7 2821, CR 214 BRIGHTNESS aIrITE14 ZENITH Color TV Chassis 19FC45Z TEST . CI y.p AGPI OwAN SINCE rifT.-4NC ut ( Ua,Wl.w U4 WS IAO,WI WE LIJ LZ) 10 UI4 MgrO OMM R N 3eV IMO R MEE E vOLr LN O .N .jAUD10 OUTPUT TO SPEAKER ,. EY-MSS PORK ESyP EN ELECTROJLTTIC OURM5 COLOR OLI* NT CARS)H WE,WO WI TIME TO NOT USED DETECTOR OUTPUT SOUND DETECTOR OUTPUT EAR PRONE JACK USEMRLY ( SOME MODELS ONLY I REMO FOR SPACE COMMAND a tl I PCTI111E CE VOLUME CONTROL r901- PONTS JJ PAD RNTIEL. 1oK I ALIGNMENT FOR COLOR J ft, A.O.C. . FOR COLOR ALIGNMENT MOT USED 191, z01 N Tdia MOOS p CC .ft TO aI1- GIII (1 W)AWgROARO _Sv AEDI_. PlOI r 5conga VOLUME LIMITER CONT cuu *15 (SOME MODELS ONLY LS I T ut 2a- UR l U1 U3 Ufo USO 240 COL. DE04 ear e 0903 121-695 LUMINANCE MODULE tD ;:: Po RIVI K %f=. ( J.yu ' áC W,s% 4 GI. ime BLANKING DRIVER 0901 121-433 LEVEL LOW I i1: P1233 % VERT. BL KR. 1Ñ ' )% S3I1[ f 01204 121-952 VIDEO r DRIVER 9-89 I $201 l02 IL a2 c. NORM 4203-4 M Ter VIDEO OUTPUT Rlxp 2NP+ W! fw RED LIZO) R20. 014_ E 01206 121-668 °M' E 150V , L_ Foc Uf I BLUE VIDEO OUTPUT rp5 sib IV )x" 2Kv KATERED COLOR WIN S 202 P201 2 ! ORT L MODULE UN ASSY CHROMA SUBCAR. RM9 b:,12 rRD CR61I PG Rr0" . -11.3' 1 SLUEMRI: O1 -- - - T402 :13 yu -1 SLUE yon I LU y 12 C402: .gz10 ióK' R 5e MMR.III[R I II ti -_ RE04NGME. LI L+S v[RT. ye0 1e 5 rr ilDzo ióri I1 -- I----------- )--j WITCN aHorN RORNAL POMTION. GREEN RE R2 iS L-----i 'RO< I *r OR 0209,02.0.0R 02171 -.-- - *O 02 - - - - N 4V 1571 KM *O ZVN /5.71 KM AV PR 1L71 KM *® IJNPA 15.71 KM 3025 T C,O 1 3I 4 Pr rR r< 1 CLOCKWISE ROTATION. 0- INDICATES WAVEFORM (SEE CHARTIWWEPORM MEASURED ACROSS POINTS ROOSTED (NOT TO CHASSIS GROUNDI OSCILLOSCOPE SNOULO NOT SE GROUNDED TO CHASSIS. REVEROMO LEADS o-. ROICATES (11g3J :°" :;i 41 ION P! ISIS KO *O /RTIr, 15.71 KM * 101IVP! 15.71 KM ® I!I O O 14.0V PP M NP/ pM ZIVP, p M NOT USED CHROMATIC SWITCH WIRING POSITION INDICATES PIN NIMWER ON MODULE SOARS f24v FILTERE° IRV .TRSono sN°WR POSITION ROT "E-s ror1LEwWNT COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 220 INDICATE INDICATES VOLTAGE SOURCE. =20% MAT SE USED. INDICATES WAVEFORMS CHECK POINTS. (SEE CHART WAVEFORM MEASURED FROM POINT INDICATED TO CHASSIS GROUND., 101!1 UM * REVERSES WAVEFORM INDICATES CHASSIS MISOND. a cáioos iJi POTENTIO r INDICATES 5:' 3029 *rill INDICATES ALIONMENT AND TEST POINT. PICOFARAD Mlem MEGAHERTZ y0m MICROHENRY O °41pÑ S~M0f GOES ä W1.}I30 RESET N --1I-- 201 -II O EC LEVEL, CONTRAST MO PICTURE PEAKING CONTROLS. 43 THRU 49. TEST POINT'0' MUST BE BY-PASSED CAPACITOR. SF 01. n rcoHT q25 >A- uze 0I a-. ü4 15V 1t10 2a.11 0203 ARROWS ON oa R10E CRABS 4E ALL RESISTORS ARE 010% TOLERANCE CARSON, 1,2 WATT UNLESS OTHERWISE SPECIFIED. COIL RESISTANCE NOT GIVEN UNDER ONE OHM. ALL CAPACITOR VALUES IN MICROFARA D5 UNLESS OTHERWISE SPECIFIED. FOR CAPACITOR TOLERANCE, SEE LEGEND. CATHODE RAT TORE 2ND. ANODE VOLTAGE TO IN MEASURED WITH ELECTROSTATIC OR 20K OHMS PER HOLT MIN. HON UOLTAOE METER. ii -0021 192 221-42 :,C [E s CIRCUIT. 022-.04T 130 MES U9 1.N[4=p:tiC20 >2':.R-. cqM = IEro T. T OTN[VEC ó12iº ---1 %i ate IOw U22 f24V 1.24V C21021 I C- 11 R1025 4 .C. I R[G I-- Iaa 12VDC TOE _- RIWTt[ M[[M NDIIR. 1N 1------ WK91W0 LION i0A ® 0-÷ WIT © 0-11/19 CeOE MSI =l2.LIREE N Moe .,.w, 1 L[IT MO[ CIRI{0. 0a EL LIN 90S 1 liíóiE ree ,21°°5°0. ï OR ALL VOLTAGES MEASURED PROM CHASSIS TO POINTS SCOUTED ALL VOLTAGES ARE D C UNLESS OTHERWISE SPECIFIED. VACUUM TUBE VOLTMETER ALL O C. VOLTAGES TO BE MEASURED WITH MEG.. INPUT RESISTANCE MAV IRO ALL VOLTAGE MEASUREMENTS TO BE MADE WITH NG SIGNAL PRESENT AND NORMAL SETTING Or CONTROLS AND CHANNEL SELECTOR SET TO CHANNEL 2 UNLESS OTHERWISE SPECIFIED COIL RESISTANCE MEASUREMENTS TAKEN WITH COILS DISCONNECTED FROM f q ALL REISTORS . Toth e1 LNiNoiGEn K i DTOr rR. EMT. r 'j SAL UNLESS oa CRUP lN[ s ZIT J00 M FOR WAVEFORMS S f D 123-.e THE HUE. COLOR 1CIGOt DasTci1 x20 vENT _i BOTTOM VIEW OF TRANSISTORS ®OR RIOOe "VS SOT RA12 1 CI [M2I Y ov A a11 2°zaF1°0aF H OT C 0201 100 REGENERATOR QQSt -45,734. S10 CIO' MODEL 19FC4521 1 TURN PORE!, OFF BEFORE REPLACING SEMICONDUCTORS. STANDARD GATED RAINBOW COLOR BAR SIGNAL PHOTOGRAPHS TAKEN ON THE WAVE SHAPES AT THE HUE SETTING ADJUSTED FOR PROPER COLOR THE RED, GREEN AND BLUE CATHODE GRIDS OF TIE PICTURE TUBE DEPENO ON 1 I.C.1001 221169 CR613 100-606-03 [iD Nl SPANN K/>hM c122i S- 94680 CR609 NOT USED V2011 PI O) 19VD2 P22 I 1N Ion SD ;en. GLASS. 9-86_ SA ASSEMBLY MADE WITH SPECIAL LOW X-RAY TYPE NOTES r,2W CONVERGENCE I 020.020l.02oÁ.OR 0207 309/ 1 UA NOT USED (NOTINTERCHAN- y ) 0102.003.0104.0103ORDIO-, OR uo+ RMM .1201-1 NOT USED I I CUE F Ice> -la 4 U Pta -3 5 C'--' 111" 2 W WI oR THRESHOLD LEVEL W pI COLLECTOR I I [ C 'IL. C wer R i T UIE COLOR AMP 4.NPJ 1571 KEM 01207 121-868 W23 ) Si IS / OMEN ® GREEN VIDEO OUTPUT MODULE UN.ASSY. VIDEO OUTPUT 31 SLOE COLOR AMP COLLECTOR AMP. COLLECTOR GEABLEI 4 TYPE I44 w9 S i InR Ir:i' iY G2t0 01205 121-868 aaz,F ) RED COLOR : I I si.. nu ' .- TO SPEAKER A.C.C. VOLTAGE R G 1 I AUDIO OUTPUT 0 L I.) E =ÄOÏ C CI}I [ S fi ilR1R v'zºr 5 ;FIES, Dp.r g IS.aRN BR Pup 37,7212: pM I.2r RRTtTTTLLt-- RIM " - I 2 MI 0--9 140RIZ.7ÚLSE S I9-88-01 ?2300 . a Epa¡ %i IS 0 '120) AUDIO MODVLE 031 TO22V SUPPLY 2 U2 Ugo U12 CpirÓl1S1 B 21éÑ l'IL`4S 9-103 MODULE AÚ010 UN `-El 230V 220. L,J100 RIT FOR WAVEFORMS 43 THROUGH 49, BYPASS TEST POINT "D" WITH 1.0 MF CAPACITOR. z EAST FIRST STREET, DULUTH, MINNESOTA 55802 MD NOT USED 1587 -Wrr4 ELECTRONIC ZENITH SYMBOL 711 1975 TV Chassis MAY 19F B14 COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS r 150-31 MODULE, ASSY I.F. 121-504 121-505 OR C121 I 11 121- S+ 1 IST 503 Is 141 IR 1 5 ./ C113 >D C LINK COIL 103 .0015 5.4 39.1 1.41 0% 1.1A Ill TUNEA TUNER TO Off + . 2 ±,SK RITI 41 19.16 , 40 50 3.93 390uN 5'. 1 4 0125 .0015 I 1.101 I 27,21 5I i f DI 0401 _L _ Ou .041 A.G.0 DELAY 331 51 590411 0411 11Ñ .404 1 .IS {.1r =2.11 I Sr. 0400 10 1000 50405 27 II S6 24V Si ,. 121 - c11101À ISO S9 51 5. 2.5r 5.60 59 t 1 S% 1 `.oa .05 403 +24V4 A101 IOR ACC 1411 IfG. 5+ 0424 414 Q Iln 11.5 121 iC111 t C417 AUDIO OUTPUT 1 680 `-*>-7 2200í 2.24 5% -975 4fSEnlT 8-973J6 -yi-7/ R21J 3.31 MICI' VOLTAGE 8EN0TF TO RED 0426 11214 19114 is n 15./511NTS{0Mt SYNC LIM. Ils II C204 0071 U2 T T GRN T TO 114 RASTER I. 1207' 11496100 59 011414 58/116 9203 TEL 1201 ILLO 8212 .1018_ .0027 cc +24V 0201 121-713 - h-- F-+ S9 -.721 101 4 7.71.59 0405 20 1.2 100 C10I8 4. AND OF LP1x s+ ?Clon600iT 1431 120 L4ol 15 5+ 1.41 4 2 V201 19VDHP4I 0428 8121 0425 5+ 124V 55}1/,1\ .003fí --2---`D, 1 2.71 ¡ÍÏ\Ì I le DELAY 0122 2201 0419 1. TC401 0420 3.51 3. 13.7V N61.0: - 6402 - 9-1 \ VIDEO OUTPUT +24v VIDEO DRIVER si4 -17.21 Its *DEMOTES FEED 0012 TERMINAI 16 650 151 1S060 NOODLES USE CER46IC FEE0 IMBU CAPACITORS/ OR 121-868 0404 121-895 .,01115 1.37 / 150 y, VIDEO OUTPUT AND A.G.C. 0406 GATE S'v 0011 0402 :.26 9-101 MODULE ASSY OR 121-990 AGC 1Y 9-95 -446 121 0413 ßi11 ACC LEVEL 3 11l 5% 60414 -II--. .00/ 8u0 OUTPUT 4.32 1 3 1.71 2Rr-. C404 A.G.C. CI0 2 121-671 J 5% I_IY 300 L209 113 5i ^Y'3 -0403 8417 +24V 0402 121- 699 1203 0001[I101 +Rn01I C1115 1101.E1 r 1201 0R moil- 310 +24v TO I 01101 II 1.41 10 4- ICIIDI C121 1101 IV 0015 0011 .027 F 6122 R110.33T 1241 1 .0015 TOOIS 1 Tp _.0015 44 1 C201 C124 RI 12 cln 10 C121 410 10 . cn1 ß11Y - 2011 59 0120 -3.912 150(1 cIIS T.0015 I sx ' C121 105 Rn5 0119 5% / Do IO 5+ f Am 610 L L110 noUIEE VITO 86.6502 T , 27111 CR101 7101 USED ON --A.111n4 L 1109 12pF 1107 204V 46 ' 010! £ °4 10 J 23 COUNTED 2.21 120 1 In. 11101 17H 03RD j! R113 -C116 8107 3.98 63-10148 121-522 OR 121-951 I.F 1106 = 1)020 T208 -power xformer T1102 -quad xformer F201 -fuse .6a bel fuse 63-5440 63-10281 0103 56 4.1 223 05 IR I -audio output xformer 1 1'41/P 1106 27 I T201 T204-horiz driver xformer T205 -sweep xformer I C111 7.94 22-7314 150-211 MODULE ASSY SOUND 3.34 '49 I 4.51 oF 11024 1 63-10225-01 63-10225-01 63-10290 95-3120 95-2895-03 S-97079 95-3141-01 95-2620 136-100 R723 -thermistor R112 59 R103 1 C104IC105 C106 CIDI 11B1f 12pfT2Dp' MF 51F 5. TT". 10- 1101 COIL OR R702A-50K rotary dual rotary control R702B-500 ohm rotary ZENITH PART NO. R414 -3K AGC level control 121-954 2ND F OR 121-954 IST I.F 1112 I CIDI 802.101101 IF-- O 0102 121- 506 OR 0101 DESCRIPTION C220A-200mfd electro capacitor 150v C220B-50mfd electro capacitor 150v C220C-300mfd electro capacitor 50v C220D -1000mfd electro capacitor 35v R215-varistor R224-varistor 0204 236JI 31 167 61 23 C27CO I I - LavJ 3.2V P -PV B+ 2.21 6202 0222 VER CIA . 140 V 33 751 0204 MOLD 1.21 C201 11 110 TO OF G WHITE LEAD SWEEP x0411. 1202 1201 300 j OLI CONTRAST 6216 47M TED r-.- +130V BIT 1219 470 80 Hz 0203 FF2 0703 T C 121-975 OR 121-982 AS SY.. VERTICAL B HORIZONTAL HORIZONTAL A.F. C. 9-115 MODULE 0710 - 330 0702 121-975 OR 121-888 VERT. DRIVER 174 CITO 11712 [7111 411 5 .0012 1 . 0111 03 ; CI 12 .0056 0120 0033 .0033 1.11 106 1171l 210 .027I/0 0714 UU an 1204 448 CR2/1 RFD EL 0 TEST 100 00 R725 ILK 1 1.12 1203 0121.062104 COIL 01241 121-755 IW fE 1 1211 OUTPUT ALIOAREENT DISCR. OUTPUT VIDEO DRIVER OUTPO 3110 LI OASE A G C. 3110 0011100 ;: 1.207 MORIE.» Lo ' HORI Z. DRIVER DETECTOR OUTPUT SECOND IF COLLECTOR VIDEO OUTPUT -1_2211 59 0210 .0077 156 D5, 54 C210 R122 160 110,125 0251 1100 Cu°5 25V R715 1 11111 L210 C222 1 - C113 .001 CAPACITORS, +24V 10% 2.26 1121 5 SE 11,11,1E HOR1Z. OUTPUT 410 1.21 C715 01 56 HORIZ OSC EEII 1 177 O1I{ 0707 0708 AND 0709 ALTERNATE 2 4230 E 24121-975 OR H0121-888 7./4 59 1001 2 .0015 10E6 0704 1100r IHi1 _ { 4 R116 121-985 1 1212 11 21ßF EI IS EEO T PILLION SPEAKER REMOTE UNIT 6 ASSEMBLY S- 84209 NOTES 03 451E 090 1007 SPEAKER PILLOW PLUG &CABLE 5 0207 kqt 1 welt 0239 3a CR203 19194( 1001 V V >ANNE, SELECTOR + +140V +ISGV IAHO M.4 DI 111111 10% LOCK 2.8V \ CHANNEL 2. ME DE USED. CONTROL (.13a Fr 0202 121-758 '301 0234 VERT. OUTPUT 1/2 Adel; 0020111uaT a Rf0 121-821 OR 5 1r21 12071 4225 1/2W 10 RESISTANCES MOT SPECIFIED API UNDER ONE DIM. 11200 1111 56 SET 10E1 NOTE 8, OTMEROISE SPECIFIED. 1, CAM ,20 PERCENT TOLERANCE10, TO R206 101011115S SWITCNON TUNER P PV 15 75 KHz I 11 8224 0223 5-64209 5 /7711 +130V RED REFERENCE WIRING FOR i " DS2q4-tM[11 r = Us 4. o. CATHODE RAY TUBE F I + V FOR RASTER 3 Lee BLANKING SWITCH ON TUNER ERGARERTI 12 ALE AT DRIVE COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 GN NICROWENNy 04v6101115 TEST 00,10 TURN POSER OFF TAKEN cl SIGNAL DEVELOPING 2.5 VOLTS PEAK CONTROLS SIT FOR 101111AL 1111116. REPLACING SEOICONDUCTORS ON AIR TO ZERO »PALL WORE NOTOR S-67786 DRIVE MECHANISM ASSEMBLY Tv ON-OFF SWITCH ON TUNER hN LEGEND. 15 le 5% SEE MEGACYCLE 73 L40N1 ma CAPACITY TOLERANCES EAST FIRST STREET, DULUTH, MINNESOTA 55802 Invsmi LEADER Rut r mtic Dual Channel/Dual Trace 5" Scope/Vectorscope on 0801_M.. wuc Y á..,o- MODE automatic Horizontal automatic Vertical Input Automatic Trigger Automatic operation is the key and virtually error free accuracy is your bonus with this unique 5" Dual Trace Scope. The advanced design even lets you read between the ranges in any position, as easily as you can with analog VTVM's or VOM's. High reliability PC boards assure long term dependability while a high intensity CRT delivers excellent contrast. It features: separate or simultaneous sweep display, Ch 1 & 2 - alternate, chopped, auto/norm trigger; 10MHz b'width; Sweep 10mVp-p/cm to 20Vp-p/cm vert'l sensitivity in 11 calib. steps; 0.5µS/cm to 0.2S/cm sweep range, 18 steps calib.; X5 mag.; XY and vectorscope displays. Compact, lightweight, economical. 569 MODEL L8O-506 Complete with probes, terminal adapters. test leads. LEADER"Put Instruments Corp. 151 Us To The Test" Dupont St., Plainview. L.I.. N.Y. 11803 ...for more details circle 116 on Reader Service Card (516) 822-9300 It's new. It's drop -proof. It's burnout -proof. It's super-safe. The Triplett Model 60. Only 590. New unconventional concept in V -O -M design gives you an extra chance after accidental misuse ... not a repair bill or downtime. The 28-range, general-purpose Triplett Model 60 was specifically developed to withstand over 90% of the costly in -field and at-workbench misuses of V -O -M's in electronics/electrical testing and circuit trouble shooting environments. Forget about a cracked case when it falls off that workbench or a burned out meter movement because of wrong range or test function setting with this new Triplett Model 60. It's also built with safety -for-you, the user in mind. The new Triplett Model 60 is made for many uses and many users like electrical/electronic circuit designers, vocational training schools, production line testing and quality control, research labs, industrial maintenance, tv, radio and stereo service shops, appliance and automotive maintenance work, hazardous and remote area installations, hobbyists and experimenters. You also get more extras when you buy the new Triplett Model 60. A special "Confidence -Test" circuit is built into the new test instrument for periodic reassurance checks of its meter. The rugged 4'/2" suspension type meter is complete and separately cased for easy, fast replacement in field. Includes a polarity -reversing switch plus a single range selector switch for the eight DCV ranges from 0.3 to 1000, six ACV from 3 to 1000, four DCmA from 0.1 to 1000 and five resistance ranges from 1k to 10Meg. Also has direct reading scale for optional clamp -on ammeter. The new Triplett Model 60 is yours for only $90. See it at your local Triplett distributor or Mod Center. For more information, or for a free demonstration see him or your nearest Triplett sales representative. Triplett Corporation, Bluffton, Ohio 45817. 1. DROP -PROOF. Virtually indestructible for F accidental drop up to a five foot height with deviation from stated accuracy not exceedint +.4%. 2. BURNOUT-PROOF. Protected by diodes an unusual three fuse arrangement including 1/8 Amp, 1 Amp and 2 Amp/1,000 V fuses. Maximum protection level provided by the 2 Amp/ 1,000 V (20 kW) fuse. 3. SUPER -SAFE. Designed to most rigid safety standards to prevent explosive arcs in high energy circuits, up to the 2 Amp/1,000 V (20 kt fuse capacity; completely insulated unit with newly designed safety leads. 1111TRIPLETT BLUFFTON, OHIO 45817 /We Triplett. Theca readers. ...for more details circle 129 on Reader Service Card