Philips Ptv400 Series In-home Service Guide Projection Television

Transcript

SEARS America's Repair Specelists 57211093 PHILIPS In-Home PTV400 Series Service Guide Projection Television S.T.T.S Dept. 702PSO © 1993 Sears, Roebuck and Co. Printed in U.S.A. 10/93 Informatiq Category Ma 702PSTEC13 5721 1992 P1 v CHASSIS IN-HOME TROUBLESHOOTING GUIDE CONTENTS Subject Page SECTION 1 General: Servicing and Safety Precautions ........................................................ Introduction .......................................................................................... Signal Flow .......................................................................................... Power Supply ....................................................................................... System Shutdown ................................................................................ 3 4 4 5 6 SECTION 2 Troubleshooting the PTV System: Access ................................................................................................. 8 Diagnostic LEDs of the Power Supply ................................................. 8 Deflection Failures, Video Blanking, and High Voltage Shutdown ....... 9 Video Troubles ..................................................................................... 9 SECTION 3 In-Home Adjustments: Ground Connections For Test Equipment ......................................... Unless Otherwise Specified: .............................................................. On-Screen Menu Positioning ............................................................. RF AGC Delay ................................................................................... VCO & AFT Adjustment ..................................................................... Sound Alignment ................................................................................ Sub-Contrast Alignment ..................................................................... Comb Filter Alignment ....................................................................... Sub-Brightness Adjustment ............................................................... Dynamic Gamma ............................................................................... High Voltage Frequency Adjustment ................................................. Video Level Alignment ....................................................................... Vertical Height Adjustment ................................................................. Vertical Blanker Adjustment ............................................................... 130Vdc Adjust .................................................................................... Stereo Decoder Alignments ............................................................... Composite Input Level Adjustment .................................................... Stereo DBX Filter ............................................................................... Pilot VCO Adjustment ........................................................................ 300Hz Separation .............................................................................. 3kHz Separation ................................................................................ Focus Adjustments (Electrical and Optical) ....................................... Screen (G2) Adjustment Procedure ................................................... Gray Scale Tracking, Sub-Brightness Adjustment Procedure ........... HLG 11 tt 11 11 11 12 12 12 13 13 13 14 14 14 15 15 15 15 t5 16 16 16 17 18 1 Screen Geometric And Centering Adjustments ................................. Green Screen Geometry Adjustments ............................................... Blue Screen Convergence Procedure ............................................... Red Screen Convergence Procedure ................................................ Programming Factory Default Values ................................................ Test Mode Entry and Exit ................................................................... Adjustment of Registers in Test Mode ............................................... Description of Test Mode "C". ............................................................ Description of System Information/Diagnostics ................................. SECTION 4 19 19 20 20 21 21 22 22 23 Simplified Drawings: Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 1 - PTV410 Frontview ............................................................. 2 - PTV410 Rearview .............................................................. 3 - PTV420 Frontview ............................................................. 4 - PTV420 Rearview .............................................................. 5 - PTV430 Frontview ............................................................. 6 - PTV430 Rearview .............................................................. 7 - PTV400 Block Diagram ..................................................... 8 - PTV Power Supply Module Block Diagram ....................... 9 - PTV400 Power Supply Connections ................................. 10 - PTV400 Shutdown Circuitry ............................................ 11 - PTV400 Signal/Deflection Module Layout ....................... 12 - PTV400 Cable Connections ............................................ 13 - PTV400 Customer Keyboard & IR Receiver Connections ............................................. Figure 14 - PTV400 Jack Panel Connections .................................... Figure 15 - PTV400 CRT Connections .............................................. Figure 16 - PTV4t0 Simplified Diagram ............................................ 2 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 SECTION 1 Introduction Servicing And Safety Precautions Always use safe servicing procedures: 1. Use an Isolation Transformer when servicing the Projection Television to protect both the set and test equipment. 2. Be careful of shock hazard when operating the set with the back removed. 3. When servicing the CRTs, always wear safety glasses. Be careful when handling liquid cooled CRTs to protect the overflow bellows. 4. Do not remove solid state devices while the set is turned On. 5. Be careful that the correct Ground Reference is used when making measurements. 6. Be certain that all grounds, ground straps, and wires are properly connected to protect the set and user from shock. 7. Always check for shock hazards after completion of chassis repairs. Refer to Service Manual 7518 for proper "Safety Check" procedures. 8. The 160Vdc Source is present and the Standby Power Supply is running on the Power Supply Module anytime the set is connected to an AC Power Source. In-Home Recommended Test Equipment: 1. Isolation Transformer (Not required when using a hand held DVM) 2. DVM (High Impedance) 3. Pattern Generator (RF and Video) 4. Two pairs of jumpers The 1992 Projection Television (PTV) comes in three basic configurations, the PTV410, PTV420, and PTV430 Series (see Figures 1 through Figure 6 in Simplified Drawings section). These sets feature a completely new, high-end single board'chassis design for signal and high voltage circuits. The new board is called the Signal/Deflection/High Voltage Module. A separate basic Power Supply Module is located to the right of the main Printed Circuit Board (PCB). Other feature differences in these sets include Multi-PIP (Picture-in-Picture), AVIO (Audio-Video-Input-Output) Jack Panel, and many Audio System options. The new P']'V features the TS-2D Tuning System (Figure 7). The TS2D Tuning System is an On-Screen, Total Remote, Menu Driven Tuning System. The Tuning System is mounted on the Signal/Deflection/High Voltage Module. The Microcomputer for the Tuning System communicates via an 12C Bus with the ClockJCalendar IC, EEPROM IC, DAC IC, RF Switcher (optional), AVIO Jack Panel, and PIP Module. The EEPROM and Clock/Calendar IC's are used by the Tuning System to store information needed later. The DAC (Digital-to-Analog Convertor) IC receives serial digital data from the Microcomputer and converts it into analog information for the Brightness, Picture, Color, Tint, and Sharpness controls. A Character Generator IC develops the RGB and Fast Blanking signals for the On-Screen Graphics. The PTV Signal/Deflection Module also features an IF Signal Processor integrated circuit (IC200) and a NTSC Signal Processor IC (IC600). The RGB signals from IC600 are sent to the CRTs. A fullfeatured, one-chip, Stereo Decoder IC (IC120) is also included on the Signal/Deflection Module. Signal Flow The Signal/Deflection Module features split Audio and Video IF processing. The TV signal is applied to the UN Tuner, or through an optional RF Switch to the UN Tuner. The IF signal is developed in the UN Tuner and sent through a dual output SAW Filter to the Audio and Video IF inputs at IC2O0. The detected Baseband Audio signal exits IC200 and is sent to the Stereo Decoder IC, IC120. Left and Right channel audio signals exit the Stereo Decoder and are sent to the Jack Panel. 3 The Video signal is developed by IC200 and is applied to the AVIO Jack Panel for switching. If an optional Multi-PIP Module is used in the 4 set,the coml.,vsite video is routed from the Jack Panel to the Multi-PIP Module. ReModulated Video (RMV) is returned from the Multi-PIP Module to the Jack Panel and then is applied to the S-VHS Switch IC, IC670. External Video input from an External Video source can be applied through the Jack Panel to the Multi-PIP Module on the External Video line. Control of the Multi-PIP Module is via the 12C Bus. The combed Chrominance signal is sent from the CCD Comb Filter Module through the S-VHS Switch IC before being applied to the NTSC Signal Processor, IC600. The combed Luminance is applied to IC600. The S-VHS Switch IC selects either the tuner signal or the Super VHS signals from the Jack Panel. The RGB and Fast Blanking signals from the Character Generator IC, IC308, are applied to the NTSC Signal Processing IC, IC600. These signals are matrixed when On-Screen Graphics are needed and the product is output via RGB lines to the Green CRT Board. Without RGB input from IC308, normal program material is presented to the Green CRT Board. Both the Red and Blue video information go through the Green CRT Board before going to their respective boards. The Luminance signal from the Switch IC is also applied to the NTSC Signal Processor to develop sync for the Vertical and Horizontal Oscillators. The horizontal drive signal is applied to the Horizontal Circuitry where the scan-derived voltages are developed. The Horizontal Pulse (H Pulse) is sent to the High Voltage Sync Processor, iC900, which drives the High Voltage Output Circuit. This circuit develops the High Voltage, Screen (G2) Voltage, and Focus Voltage. The vertical signal exits IC600 and is applied to the Vertical Deflection IC, IC550. The amplified vertical signal drives the vertical windings of the Yoke. PTV Power Supply Module The PTV Power Supply Block Diagram is shown in Figure 8. The 120Vac Source is applied to a Bridge Rectifier circuit, which produces approximately 155Vdc for the Switching Mode Power Supply. There are two separate Switching Mode Power Supply circuits used in the PTV. The 155V is supplied to both of these circuits. Each circuit has its own transformer and Power MOSFET regulator. Both regulator circuits are controlled by one Controller IC, IC401. One of the circuits is used for Standby operation, with both circuits being used for Full Power operation. As soon as the TV Set is plugged into an AC Receptacle, the Standby Power Supply starts running from the voltage applied through R416 to IC401-16. As the Standby Power Supply comes up to full operation, 5 approximately 12Vdc is provided via Diode D405 to the Controller IC for the continuing source voltage. A 15V-Standby Source is used as the source for the 5V Regulator, IC408. The Standby Power Supply runs all the time the chassis is connected to the AC Power Source. A square-wave signal exits IC401-7 to drive the Standby Regulator, Q402. Q402 is a Power MOSFET device that drives the Standby Transformer, T402. The SMPS is switched to fullpower by a logic level control from the Microcomputer. This logic level is input to the Control IC, IC402-16. The Control IC operates the On/Off Opto-lsolator, IC406. During Full Power On, the transistor side of the Opto-lsolator effectively opens and IC405 is allowed to control the regulation of the Full Power Supply via IC401. A rectangular wave signal is then allowed to exit IC401-10 to the Full Power Regulator, Q401. Regulation is accomplished by monitoring the 130V Source via a voltage divider network. This feedback reference voltage is sent through the Control IC and the Output Voltage Regulator Opto-lsolator to the Dual Controller IC. The 130V Source can be adjusted by changing the reference voltage via the 130V Adjust potentiometer in the divider network. Cable connections and voltage check points for the Power Supply are shown in Figure 9. To assist in making connections, plugs and jacks have been color coded in the 1992 Projection Television. Note, jack 402 has a yellow plug and jack 404 has a red plug. Another feature is that all boards have been coded with a letter. The Signal/Deflection board is the "A" Board and the Power Supply board is the "P" Board (see Figure 16). The 404 cable end that connects to the "A" Board is labeled "A404" and the other end of the cable that connects to the "P" Board is labeled "P404". This labeling method will help prevent incorrect connections. All voltages from the Power Supply can be checked at the jacks of either the "P" Board or the "A" Board. Also shown in Figure 9 are the Scan Derived voltages. Shutdown Circuitry The High Voltage circuitry, even though it is located on the main chassis PCB, is separate from the Horizontal circuitry (Figure 10). The High Voltage is phase locked to the Horizontal signal via the "Horiz Pulse" as input through Q900. This pulse is applied to IC900-3, the High Voltage Sync Processor. Its output drives the High Voltage stages to the HV Output Transformer, T900. Here, the High Voltage and Focus/Screen Voltage is developed. A Shutdown/Phase Sense winding from T900 develops the signal used for phase correction 6 (input to IC900) and Overvoltage Shutdown (input to IC902). Beam Current is monitored from the bottom of the Diode Stack, Pin 10 (Aquadag). The PTV will go into Shutdown when the High Voltage or Beam Current increases beyond the designed safety limits. There are four basic shutdown areas; too much High Voltage, too much Beam Current, no Horizontal Scan, and no Vertical Scan. In the case of no Horizontal or Vertical scan, beam current must be stopped quickly to prevent damage to the CRr's phosphor. A sample of the High Voltage is taken via the HV Bleeder and applied to the Programmable Shunt Regulator, IC901-1. This s,_mple can be adjusted by R943 to attain the desired High Voltage. IC901 sends the product of this sample voltage through Q903 to IC900-8 to regulate the output voltage. The output of IC900 can be completely stopped if Q904 turns On and inhibits the feedback path between IC901 and Q903. This input via Q904 is the shutdown input for a scan type of failure. There is also a sense input for the 15V Source called Low Voltage Detection. Either one of these failures will blank the Picture Tubes and turn On Q904, placing the set in shutdown. The Shutdown Control IC, IC902, watches for too much High Voltage and/or too much Beam Current. If IC902 is turned On from either of these conditions, it must be reset by turning the set Off and On again. Beam Current is monitored from the bottom of the diode stack and applied to Q907/Q908. The output from Q907/Q908 is applied to the Picture Control circuitry to modify the contrast level. When IC902 is turned On, Q901 is also turned On, placing the set in shutdown. The High Voltage shutdown comes from the Shutdown/Phase Sense winding on the HV Output Transformer. If the level of this pulse becomes too high, IC902 will turn On and shut the set down. SECTION 2 Troubleshooting Access the PTV System: To gain access to the various Modules proceed as follows: and Panels in the PTV, Convergence Panel, CRT Boards, and Yokes - gently pull off the two plastic railings on either side of the Customer Keyboard. Next, remove the speaker grille. Now, remove the screws holding the Convergence Panel and place it into the service position. Other Modules - remove the back cover. The Signal/Deflection/High Voltage Module can be placed into a troubleshooting position by removing one screw on each side of the frame and two long screws from the top of the frame. Next, release two tabs at the top and the module will hinge out. This facilitates getting to the main board copper side without removing it from the set. Diagnostic LEDs of the Power Supply The Power Supply Module is equipped with two LEDs that are visible when the cabinet back is removed. These LEDs are a quick check for several possible problems or conditions. Under normal operating (On) conditions both LEDs should be lit. If not, these are the other possible conditions and what they indicate: D429 (located on the front edge of the module): On: Normal (lights up whenever AC is applied). Blinking: Problem with 15Vdc Standby Supply. D430 (located at the top of the module): On: Normal (lights up at "Power-On" command). Off: No 130Vdc Supply is present. If there is a failure of the Power Supply Module, the voltages shown in Figure 9 should be checked with a DVM. There are two fuses located on the Power Supply Module that should be checked. With the set connected to an AC Soume, the 5V Standby (P403-1) Source and 15V Standby (P403-2) Source should be present. If not, the Standby Power Supply circuitry should be repaired or the Module should be replaced. If the Standby Supplies are okay and the Full Power Supplies do not come up to normal voltage, repair the Full Power Supply or replace the Module. The 130V-A Source is available from P402-1, while the 130V- 7 8 B Source should be present at two locations, P404-5 and P404-6. The 130V-C Source can be checked at P404-7. The 9V and 15V Sources can be checked at P402-5 and P402-2 respectively. If only one voltage is missing, that circuit can be repaired to restore the complete Power Supply. Deflection Failures, Video Blanking, and High Voltage Shutdown The CRTs in a Projection Television can be damaged if deflection stops and the beam current is not stopped immediately. The CRTs can be damaged if the beam is allowed to be On for as little as a thousandth of a second with no deflection. It is important NOT to defeat the deflection failsafe and CRT phosphor protection circuits as shown in Figure 10. If horizontal or vertical deflection circuits are not operating properly, blanking of the video will occur from the collector of Q500. Keep in mind, a failure of the protection circuits can also cause blanking of the video or shutdown of high voltage. With a set operating normally, Q501, Q502, and Q904 are turned Off. QS00 is turned On which allows a High level to be placed on the Blanking line. This High level allows the picture tubes to operate, while a Low level will cause the CRTs to shut Off. Jack Panel. The video returns from the AVIO Jack Panel on J620-1. This Pin should also be checked because the video could be going to the AVIO Jack Panel, but not returning to the main chassis (Notice J620 in the Cable Connections drawing of Figure 12). If the set does not have a Multi-PIP Module, the next place to check is J600, Pins 5, 3, and 1. This is the Red, Green, and Blue output signals to the CRTs. If these signals are missing, the Signal/Deflection/High Voltage Module should be replaced or repaired. If the set is equipped with a Multi-PIP Module, the video path can be checked at J621, Pins 3 and 1. Pin 3 is the tuner video to the Multi-PIP Module and Pin 1 is the video coming back to the main chassis. If either the Multi-PIP Module or the AVIO Jack Panel shows a failure in video processing, replacement or repair will be necessary. tf the set will not show the Menu information, the problem is usually located in the output circuitry or there is a problem causing blanking. Vertical and horizontal deflection waveforms are peak detected by Diodes D502 and D504. These voltages are stored in capacitors C501 and C503. The capacitor is discharged by a res'istor so that if deflection stops, the capacitor will be discharged and blanking will be activated. An oscilloscope can be used to verify the proper operation of horizontal deflection by looking at the cathode of D503. For Vertical deflection, look at the cathode of D501. If the lowest voltage at either check point drops below approximately 15 Volts, blanking will occur. If the 15 Volt supply is not high enough, Z500 will not be conducting (voltage less than 10 volts) and Q5OO will not be turned On. The collector of Q5OO will be Low and the high voltage will be shutdown and video blanking will occur. The high voltage is shut down because the base of Q502 is Low and the emitter of Q502 pulls down the high voltage Stow-Start capacitor, C911. Video Troubles The video processing circuitry can be divided into two sections (Figure 7). One is the tuner video from the UN Tuner to the NTSC Signal Processor IC. The other is the video from the Character Generator IC to the NTSC Signal Processor. If the system Menu or On-Screen Graphics can be viewed and there is no video, check for composite video at TP1 (Figure 11). TP1 is located next to the UN Tuner. This same test can be made at J620-4 on the main chassis. This is the point where the video leaves the main chassis and goes to the AVIO 9 10 SECTION 3 In-Home Adjustments: Caution: The PTV410/420/430 incorporate a "HOT" ground system on the Power Supply Module. Always use an Isolation Transformer when applying power to the exposed chassis. Ground Connections 1. 2. 2. Short Test Points 16A & 16B together at the bottom of the UN Tuner. 3. Short Test Point 23 (Pin 13 of IC200) to ground (Shield around It200 is good). Connect a DC Voltmeter to Test Point 7 (Pin 18 of IC200). Turn the set On and record the voltage reading from Test Point 7 (typically 4.5 to 5.0Vdc). Turn Off the set and remove both shorts from Test Points TP16A/B and TP23, 4. 5. For Test Equipment The TUNING SHIELD can be used as the COLD GROUND connection for ALL COLD GROUND related measurements (All COLD GROUND points are interconnected between modules). The Power Supply Module contains both HOT and COLD GROUND connections. The Cathode of D404 can be used for HOT GROUND related measurements ONLY on the Power Supply Module. 6. 7, 8. 9. Unless Otherwise Specified: 1.All service adjustments are "HOT" with respect to voltage. For maximum safety, use only properly insulated tools. 2.Refer to the Signal/Deflection Module Layout Diagram (Figure 11) for the location of test points or service adjustable controls. On-Screen Menu Positioning Some Signal/Deflection Modules may have C341 screened on the board. In the past, this trimmer capacitor was used for positioning of the On-Screen Customer Menu. However, on this chassis On-Screen positioning is now under software control (see Modifying Factory Default Values later in this section). Refer to DAC registers 10 & 11 for vertical & horizontal positioning of the On-Screen Display. 10. 11. 12. 13. 14. Connect the Coincidence line at the collector of Q203 (jumper B37, near the J-TEST Connector) to 5Vdc (Pin 3 of IC401 or the Anode of D401), Apply a local broadcast signal (air signal) to the antenna terminals and turn the set On. Select the Cable Tuning from the menu system. Select any high band inactive cable channel. While still in the cable mode, now select a local VHF broadcast channel. The Tuning System will attempt to tune three times and then lock onto the FCC assigned frequency for that channel. Adjust the AFT Coil (L202) to obtain a reading of 7.1Vdc (+/25mVclc) at TP2. Adjust the VCO Col! (1_204)to obtain the same DC voltage reading at Test Point 7 that was noted in step 5 of this adjustment procedure. Remove the jumper from the Coincidence line, Verify this adjustment by changing between the high band (inactive cable channel) and your local VHF broadcast channel (ensure that the local broadcast channels lock in quickly), RF AGC Delay Sound Alignment 1. 1. 2. 3. Tune to a weak station, or loosely couple the antenna to observe a snowy picture. Set the R.F. AGC Delay (R202) to it's full counter-clockwise (CCW) position. Slowly advance R202 clockwise (CW) to a point slightly beyond the point of minimum snow. Note: Do not advance the control any further as it may result in an overload caused by a strong signal. The range of the AGC voltage supplied to Pin 5 of the UN Tuner will vary from 8Vdc (Without Signal) to just less than a 1Vdc. VCO & AFT Adjustment 1. Cut the shield break-points around IC200 and the IF Circuitry. Peel back the top cover of the shield to gain access to the internal circuitry. 11 2. Select an active channel and loosely couple the antenna until noise/distortion is apparent in the output. While keeping input signal weak enough to produce noise, adjust the Sound Discriminator (L201) for maximum output and minimum distortion. Sub-Contrast Alignment (this adjustment equipment not normally carried into the home) 1. 2. 3. 12 requires the use of Apply an NTSC Color Bar Pattern Signal to the antenna terminals. Tune the receiver to the applied signal in step 1. Connect an oscilloscope to Pin 53 of IC600. Adjust the SubContrast Control (R639) until the video signal observed on the oscilloscope is lVp-p +/-10mV. Comb Filter Alignment (this adjustment requires the use of equipment not normally carried into the home) Note: 1. 2. 3. 4. The following procedure covers the only Field Adjustable Controls contained within the CCD Comb Filter Module. These are also the only controls accessible through holes provided in the top shield of the Module. Apply a Color Bar signal from a Color Bar Generator to the Tuner Input, Connect an Oscilloscope to TP34. Adjust R20 for minimum color sub-carrier as seen on the oscilloscope. Adjust R56 for minimum color sub-carrier as seen on the oscilloscope. Repeat steps 3 and 4 for best results. Sub-Brightness Note: Adjustment Refer to the Gray Scale Tracking and Sub-Brightness procedure contained later in this section for the precise setting of all interrelated controls. Dynamic Gamma (this adjustment normally carried into the home) 1. 2. 3. 4. 5. 3, 4. 7. to ground. Connect a Frequency Counter to Test Point TP38. Turn On the set and adjust R902 to obtain a reading of 15.734kHz on the counter. Disconnect test equipment and remove the short from TP67. Note: Some Frequency Counters may be too sensitive at one attenuation level and not sensitive enough at the other level. In this case, an oscilloscope may be used. Adjust R902 to obtain a 63.5uSec delay from the leading edge of the first main vertical pulse to the leading edge of the second main vertical pulse. Video Level Alignment (this adjustment equipment not normally carried into the home) 1. 2. 3. requires the use of Apply an NTSC Color Bar Pattern Signal to the antenna terminals. Tune the receiver to the applied signal in step 1. Connect an Oscilloscope to the emitter of Q200 (Test Point TP1) and adjust the Video Level Pot (R244) until the video signal observed on the Oscilloscope is 2Vp-p +/-50mV. requires the use of equipment not Vertical Height Adjustment (this adjustment equipment not normally carried into the home) Apply a Crosshatch pattern utilizing 1001RE (100% white) to the antenna terminals (Very important step, anything less than 1001RE will not work correctly). Tune set to this signal and adjust the Customer Brightness and Picture Controls to maximum. Set the Gamma Adjust Control (R603) to its full counterclockwise (CCW) position. Display the main customer menu on the screen. Note the blue bleeding at the blanked boarder area on the left-hand edge of the menu. Rotate the Gamma Control (R603) slowly clockwise (CW) to just eliminate the blue bleeding in to the menu area. High Voltage Frequency Adjustment (this adjustment use of equipment not normally carried into the home) 1. 2. 5. 6. requires the Turn the set Off and disconnect power supplied to the chassis. Undo cable restraints and fold the chassis down (in order to gain access to the copper side of the module). Locate the copper pad for TP67 and solder a short piece of wire onto it. Connect a jumper lead to this test point and connect the other end 13 1. 2. 3. requires the use of Apply a crosshatch pattern to the antenna input terminals. Adjust the Vertical Height Control (R551) to obtain a slight underscan of the raster at the top and bottom of the screen. Adjust the Vertical Height Control (R551) to obtain a slight overscan at the top and bottom portions of the screen (approximately 8% overscan total or near 3/4 inch). Vertical Blanker Adjustment Some television stations transmit additional information such as Vertical Interval Test Signals (known as VITS), on video lines 20 and 21. VITS, Closed Captioning, and other information may occupy these lines. Normally, this additional information causes no objectional distortion on the screen as it is transmitted during the vertical blanking period. When distortion from this additional information does appear on screen, it usually shows up as a bright white line at the very top of the screen. The Vertical Blanker Control (R802) eliminates this type of distortion by adjusting the vertical blanking time to eliminate this white line from the top of the screen. In order to properly adjust this control, you must first tune to the channel exhibiting this type of distortion on the screen. Adjust R802 to just eliminate the white line. Increasing the blanking time any further will cause a loss of standard video 14 information and appear as though the screen is being under-scanned. Attempting to compensate for an over-adjustment by increasing the vertical height (size) will cause geometric distortion. Therefore, adjust this control no further than what is required to eliminate the white line distortion. 3. 4. 5. 130Vdc Adjust With only 4.5MHz (no pilot) applied, read and record the DC voltage at Test Point 64. Apply pilot input and adjust R122 until the DC voltage difference between the pilot and no-pilot condition is 0Vdc +/-25mV. Read the DC voltage at Test Point 59. If the DC voltage is less than 1V, proceed to Separation Adjustment. If the voltage is more than 1V, adjust R122 until DC voltage at Test Point 59 is less than 1Vdc, then go back to step 1 of this procedure and begin again. Upon replacement of the Power Supply Module, or if you suspect possible problems with the 130Vdc Source, check and adjust in the following manner: 30OHz Separation 1. 1. 2. 2. 3. Connect the positive _ead from a Digital Voltmeter (accuracy of 1%) to the top end of L418 (end nearest the edge). Connect the negative lead to the bottom end of the R-TEST Resistor (this resistor is located at the top corner of the board nearest you). Adjust R455 (also located in the top corner of the board) to achieve 130Vdo +/-.5Vdc). Stereo Decoder Alignments (this adjustment equipment not normally carried into the home) Note: requires the use of Several of the adjustments below require a Leader Model LMS-238P MTS Stereo Alignment Generator or equivalent. 3. Connect the LMS-238P Generator to the Antenna input. Set the Generator as follows: Mode Switch set to L Channel, Internal Frequency set to 300Hz, SAP On, Pilot On, and Level Control pushed In. Connect an AC Millivolt Meter to Test Point 66. 4. Adjust R107 for a null reading on the meter. 3kHz Separation 1. 2. 3. 4. Connect the LMS-238P Generator to the Antenna input. Set the Generator as follows: Mode Switch set to L Channel, Internal Frequency set to 3kHzo SAP On, Pilot On, and Level Control pushed In. Connect an AC Mitlivolt Meter to Test Point 66. Adjust Rl16 for a null reading on the meter. Composite Input Level Adjustment Focus Adjustments (Electrical and Optical) 1. 2. Control Preset Positions 3. 4. Connect the LMS-238P Generator to the Antenna input. Set the Generator as follows: Mode Switch set to L+R, Internal Frequency set to 300Hz, SAP Off, Pilot Off, and Level Control pushed In. Connect an AC Millivolt Meter to Test Point 61. Adjust R237 to obtain a reading of 245mV +/-5mV RMS. 1. 2. 3. 4. 5. Picture setting at mid-range. Sharpness setting at mid-range. Brightness setting at mid-range. Color setting at minimum. Tint setting at mid-range. Stereo DBX Filter Electrical Focus 1. 2. Connect an Audio Frequency Generator to Test Point 61. Adjust the Audio Frequency Generator for 97.55kHz, at 250mV RMS. 1. 3. Connect an AC MiUivolt Meter to Test Point 54 (Pin 42 of IC120) and adjust R123 for a minimum (null) reading on the meter. Note: This null voltage is less than 35mV RMS (typically about 20mV RMS). With the set tuned to a crosshatch pattern, this adjustment can be made from the back of the set (with the light shield removed). The pattern wilt appear clearer if the front of the screen is covered with a dark cloth. 2. Observe the magnified reflections of the individual picture tubes on the back side of the viewing screen. Adjust the respective focus controls (top row on the Focus/G2 Distribution Block) for the sharpest raster image. 3. Pilot VCO Adjustment 1. 2. Apply a 4.5MHz sinewave at 20mV +/-5mV RMS to Test Point 15. When pilot input is required, apply 15,734Hz, 5kHz deviation, 4.5MHz carder to Test Point 15. Connect a DC Voltmeter to Test Point 64. 15 Optioal Focus Adjustment 1. 16 This adjustment can be made through the back of the set (with the light shield removed) while viewing a crosshatch pattern on the 2. 3. 4. 5. back of the screen. The pattern will appear clearer if the front of the screen is covered with a dark cloth. Cover 2 of the CRT Output Lenses with 7 inch square pieces of cardboard. 7. 8. Loosen the lens retaining wing nuts on the CRT Output Lens and Housing Assembly. Move the wing nut in the slot of the uncovered Lens to locate the optimum optical focus point (viewing the picture from the back side of the screen), re-tighten the wing nut. Repeat steps 2 through 4 for the 2 other Output Lenses. 9. 10. 11. Screen (G2) Adjustment Procedure Control Preset Positions 1. 2. 3. 4. 5. 6. 7. 8. 9. Picture, Sharpness, Brightness, and Tint set to mid-range. Color setting at minimum. Tune the set to unused input (AUX-1 with nothing connected is good). Turn all G2 Controls (Bottom Row on the Focus/G2 Distribution Block) to minimum (fully CCW). Set the Hi-Lite Controls (on the Signal/Deflection Module) to their full clockwise positions. Set the Lo-Lite Controls (also on the Signal/Deflection Module) to their full counter-clockwise positions. Connect a DC Voltmeter to the cathode of the Green CRT (Pin 8 of the CRT Socket or either end of R210). Adjust the Sub-Brightness Control (R776) to obtain a reading of 195Vdc on the meter. Remove the DC voltmeter from the Green cathode. 10. Looking directly into the Tube Lens, bring up each of the G2 (Screen) Controts (bottom row on the Focus/G2 Distribution Module) for just barely visible light in each tube. 11. Proceed to the Gray Scale Tracking and Sub-Brightness Adjustment. 12. 13. Gray Scale Tracking, Sub-Brightness Note: 4. 5. 6. Picture, Sharpness, Brightness and Tint set to mid-range. Color setting at minimum, Tune the set to unused input (AUX-1 with nothing connected is good). Turn all G2 Controls (Bottom Row on Focus/G2 Distribution Block) to minimum (fully CCW). Set the Hi-Lite Controls (On Signal/Deflection Module) to their full clockwise positions. Set the Lo-Lite Controls (also on the Signal/Deflection Module) to their full counter-clockwise positions. 17 Adjustment Procedure Gray Scale and Sub-Brightness must be adjusted after replacing a Signal/Deflection Module in the PTV400 Systems. The following procedure assumes a Gray Scale problem exists and G2 (Screen Controls) require no further modifications. Setup Procedure: 1. 2. 3. 4. 5. 6. 7. Alternate Method 1. 2. 3. Short Pins 1 and 6 of the J-Test Connector together. Connect a 2.4K resistor from Pin 6 of the J-Test Connector to Pin 3 (Red) of the same J-Test Connector (this forces the Red cathode to 195Vdc). Adjust the Red G2 (bottom row, left) to just barely tum On the Red CRT. Now, do the same for the Green Output by connecting the same 2.4K resistor from Pin 6 of-the J-Test Connector to Pin 4 (Green). Then adjust it's G2 Control (bottom row, middle) while viewing it's CRT. Finally, the Blue Output by connecting the same 2.4K resistor from Pin 6 of the J-Test Connector to Pin 5 (Blue). Then adjust it's G2 Control (bottom row, right) while viewing it's CRT. Remove resistor and jumper from the J-Test Connector. Proceed to the Gray Scale Tracking, Sub-Brightness Adjustment. 8. 9. Install the new Signal/Deflection Module. Turn the set On and tune to a good air or cable channel. Picture, Sharpness, Brightness and Tint set to mid-range. Color set to minimum. Set the Lo-Lite Controls (also on the Signal/Deflection Module) to their full counterclockwise positions. Set the Hi-Lite Controls (On Signal/Deflection Module) to their full clockwise positions. Adjust the Sub-Brightness Control (R776) so that the darkest part of the picture is just barely lit (raster lines just barely visible). Adjust any two (2) Lo-Lite Controls (one to remain fully counterclockwise) to attain gray in low-light areas of the picture. Turn down only the Hi-Lite Control that is causing an off-white condition in high brightness white areas of the picture (if pinkish, reduce red; if bluish, reduce blue; if greenish, reduce green), Keep all Hi-Lite Controls as near clockwise as possible. At least one Hi-Lite Control must remain in it's full clockwise position. 10. Repeat steps 7 through 9 as needed to achieve gray in the darkest areas of the picture and white in the bright areas. Always adjust Lo-Lite controls to correct dark areas of the picture and Hi- 18 Litecontrolsto correct bright Note: areas of the picture. If the PTV is older or has m.uch use, other adjustments may be required to optimize the performance, such as focus and G2 Screen Control) settings. These adjustments were described in the previous procedures. Also, any dust should be cleaned from the output lenses, mirror, and back of the screen with a soft cloth. Screen Geometric And Centering Adjustments Notes: 1. 2. 3. The set should be warmed up for at least 20 minutes before making screen setup adjustments. The raster of the GREEN CRT must be centered and adjusted for a screen display that is as distortion free and geometrically correct as possible before going on to the convergence procedure. After the green screen is adjusted for correct geometry and and blue screen displays will individually be made to conform to the green. Thereby, centering and geometry will be preserved and convergence more easily accomplished. Setup 1. 2. 3. TO locate the center of the screen, place strings diagonally across the viewing area. DO NOT TAPE TO THE SCREEN. Use lowtack type masking tape and tape to the cabinet to hold the strings in place. Connect Pattern Generator (with crosshair and crosshatch available) to Antenna Terminal and tune the set to the Generator. To prevent customer controls from affecting adjustments, connect jumpers from the bottom of the following resistors to ground: ground). Also, tie the lower Pin of the Setup terminal to ground (this is to temporally disable the Convergence Panel adjustments). Screen Centering 1. Adjust Centering Tabs to center each color at the center of the screen (point of string crossing). 4. 5. Re-tighten the Yoke clamp. Remove ONLY the lower Setup Pin jumper, enabling the Convergence Panel controls. Do not remove the other jumpers at this time (keep Customer Controls disabled). 6. Select the crosshatch pattern. 7. Adjust the Vertical Size (R551) on the Signal/Deflection Module for approximately 3/4" overscan at the top and bottom of the screen (viewed from the back side of the screen). 8. Adjust the Horizontal Size (R46g) on the Signal/Deflection Module for approximately 3/4" overscan at the left and right back side of screen. 9. Repeat steps 7 and 8 as needed to produce true squares (height = width) throughout the crosshatch pattern. Use a ruler to check these results. Note: Approximately 3/4" overscan should be maintained. 10. Adjust the Green Controls on the Convergence Panel to achieve the best possible Green Geometry. Blue Screen Convergence Procedure 1. Uncover the Blue Output Lens (leave the Red Output Lens covered). 2. Re-connect the Setup Terminal Jumper (to disable the Convergence Panel Adjustments). 3. Loosen the Yoke clamp on the Blue CRT. 4. By rotating the Yoke, visually adjust the Blue horizontal Skew at the center portion of the screen (the upper and lower portions may not be properly aligned). 5. Re-tighten the Yoke clamp. 6. Remove ONLY the lower Setup Pin Jumper, enabling the Convergence Panel Controls. Do not remove the other jumpers at this time (keep Customer Controls disabled). 7. Adjust ONLY the Blue Controls (size, keystone, trapezoid, etc.) on Layout And Alignment Guide (included in your In-Home Service Guide) to aid in selecting the needed controls. CAUTION: It would be a time-consuming mistake to adjust any of th green convergence controls. Remember, the green geometry must be preserved to obtain proper centering and convergence. Red Screen Convergence Procedure Note: Be sure strings are installed correctly or the Skew adjustment will have a major affect on Centering. 1. Uncover the Red Output Lens and re-cover the Blue CRT Output Lens. Green Screen Geometry Adjustments 2. Re-connect the Setup Terminal Jumper (to disable the Convergence Panel Adjustments). Loosen the Yoke clamp on the Red CRT. By rotating the Yoke, visually adjust the Red Horizontal Skew at the center portion of the screen (the upper and lower portions may 1. 2. 3. Cover the Red and Blue CRT Output Lenses with 7 inch square pieces of cardboard, blocking the light output from these lenses. Loosen the Yoke clamp on the Green CRT. By rotating the Yoke, visually adjust the vertical Skew. 19 3. 4. 2O 5 6. 7. not be properly aligned). .Re-tighten the Yoke clamp. Remove ONLY the lower .Setup Pin Jumper, enabling the Convergence Panel Controls. Do not remove the other jumpers at this time (keep Customer Controls disabled). Adjust ONLY the Red Controls (size, keystone, trapezoid, etc.) on the Convergence Panel. Refer to the Convergence Board Control Layout And Alignment Guide to aid in selecting the needed controls. CAUTION: It would be a time-consuming mistake to adjust any of th green convergence controls. Remember, the green geometry must be preserved to obtain proper centering and convergence. 8. Uncover the Blue Output Lens. Remove Jumpers from the resistors mentioned in Step 3 of "Setup". Adjust the Customer Convergence Controls accessible from the On-Screen Menu. Programming Adjustment of Registers in Test Mode: When the receiver is operating in a Test Mode, all normal On-Screen displays are suppressed and replaced by a special Test Mode display. This display has two lines of information at the bottom of the screen. The first line of text has the version of software currently operating (left side) and the "run timer" data in hexadecimal form (right side). The second line, starting from the left, has the currently tuned channel, the Test Mode letter, the selected register number and the hexadecimal value of the selected register (00-FF). Adjustments while in this test mode are made using a Remote Transmitter as follows: a) The cursor-left and cursor-right keys allow you to select among the channel, test mode, register, and data items. b) The cursor-up and cursor-down the desired item up or down. Factory Default Values The chassis is controlled by an On-Board Microcomputer which is part of the TS-2D Tuning System. The customer picture and sound adjustments are made using either the On-Set Keyboard or the Remote Transmitter to enter commands. There are On-Screen Graphics to show the "Menu" list of adjustments. Test Mode "C" makes it possible to change the values of special memory registers in the EEPROM (IC304). Pressing "RESET" on the Remote Transmitter activates these default values and causes them to be read from memory. These registers control the customer adjustments, PIP setups, graphics intensity, and clock calibration. Test Mode Entry and Exit: Using the Remote Transmitter, enter the following button sequence to activate Test Mode "C": 1. 2. 3. 4. 5. 6. 7. Off the chassis. Digit Digit Digit Digit Digit Digit Menu 0 6 2 5 9 6 keys allow you to adjust Description of Test Mode "C": This Test Mode is used for changing Test Mode register values from their default values to new values - this includes all factory preset conditions. When entering this Test Mode, the Tuning System will attempt to retrieve the current Test Mode register values that are stored in the EEPROM (IC304). If the EEPROM has never been programmed, default data values will be stored as shown listed in the register table. Depression of the keyboard "PWR" button while in this Test Mode, or, setting Register 00 to "00", shall cause the Tuning System to write the adjusted values to the EEPROM IC before chassis power is turned Off. WARNING:Upon exiting from this Test Mode, Channel Caotions. Favodte Stations. Parental Control Code. and Personal Preference Captions will be re-initialized to their default values. REGISTER NUMBER DEFAULT DATA REGISTER DESCRIPTION Depressing the keyboard 'PWR' button will exit the Test Mode and turn 00 01 1F Factory Mode Clear Brightness (Data Ranges 0-3FH) 21 22 If the chassis is in Test Mode and AC power is removed, the Tuning System will return to that Test Mode when power is reapplied. 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 2F 1F 1F 1F 1F 1F 1F 20 09 09 1F 1F 1F 1F 1F 1F 05 05 05 05 05 08 23 40 Picture Color Tint Sharpness Bass/Rear Volume Treble/Center Volume Balance Foreground Intensity OSD Vertical Position OSD Horizontal Position Red Convergence Horizontal Red Convergence Vertical Blue Convergence Horizontal Blue Convergence Vertical PIP Color PIP Tint Graphic Equalizer Level (00-0AH) Graphic Equalizer Level Graphic Equalizer Level Graphic Equalizer Level Graphic Equalizer Level PIP Switch Position (00-0FH) PIP WR/RD Counter Position (00-7FH) SGS Clock Calibration System Information/Diagnostics: While in Test Mode "C", depressing the 'STATUS' button will replace the bottom line of channel/mode/register data with a list of letters identifying those subsystems which could be present but DID NOT respond to Microcomputer commands when the Test Mode command was first acted upon: A. B. C. D. E. F. G. R.F. Switch Accessory Tuner Control Clock/Calendar EEPROM Sound Processor PTV Convergence D.A.C. Picture Control D.A.C. H. I. J. K. L. M. N. PIP Gate Array Jack Panel Switch Graphic Equalizer #1 Graphic Equalizer #2 Pro-Logic Controller #1 Pro-Logic Controller #2 Sound Processor (Plug-in Module) (IC 201 in Tuner) (IC 303) (IC304) (5x2 Power Amp) (Convergence Board) (IC 330) (PIP Module) (ICl) (Pro-Logic Board) (Pro-Logic Board) (Pro-Logic Board) (Pro-Logic Board) (Pro-Logic Board) 23 24 SECTION 4 - SIMPLIFIED DRAWINGS SCREEN ASSEMBLY CUSTOMER KEYBOARD CRT's SPEAKER CONVERGENCE PANEL A10435A001 4835-21_77382_ SPEAKER APTIOOAO01_r/ _386 _483_97 APTO96AO01 CRT, SOARDS i':!:!:!!!::!!:::! I I L FIGURE 1 - PTV410 FrontView 25 MIRROR ASSEMBLY SIGNAL/DEFLECTION/HIGH MODULE EMV101A001 4835*219-97105 VOLTAGE POWER SUPPLY MODULE APW034A001 4835-219-77389 2X5W AMP AMPOl 7A001 4835-219-57353 r i i AVIO JACK PANEL AVJ108A001 4835-219-77367 i 26 __ I FIGURE 2 - PTV410 RearView FOCUS/G2 DISTRIBUTION BLOCK 220493-3 4835-101-97018 SCREEN ASSEMBLY CUSTOMER KEYBOARD CRT's SPEAKER SPEAKER APT100A001 CONVERGENCE PANEL A10435A001 4835-21_77382_ 4835-21' _-77386 APT096A001 CRT_ _ ";';-;-,...:,,,: BOARDS i ' FIGURE 3 - PTV420 FrontView 27 MIRROR ASSEMBLY PIP MODULE i APP006A022 4835-219-77376 SIGNAL/DEFLECTION/HIGH MODULE EMV102A001 4835-219.971(36 I , 2X5W AMP AMPO17A001 4835-219-573,53 VOLTAGE i POWER SUPPLY MODULE APW034A001 4835-219-77389 I L_ L AVIO JACK PANEL AVJ109A001 4835-219"77368 FIGURE 4 - PTV420 RearView 28 FOCUS/G2 DISTRIBUTION BLOCK 22049_3 4835-101-97018 SCREEN ASSEMBLY TWEETER TWEETER CUSTOMER ID SPEAKER KEYBOARD _ st- I CRI"s SPEAKER _ ---.a © APT098C003 4835-219-77411 4835-219-77409 APT099C003 4835-219-77412 / CONVERGENCE PANEL A10435A001 4835-219-77382 CRT _ '_ BOARDS}] _ r _ _ _ _=_=====_=_===_=_=======: _tll. ....... _, FIGURE 5- PTV430 FrontView rl 1l 29 MIRROR ASSEMBLY MODULE IMULTI-PIP APPOO6A022 1 0 0 W A T AMPO16A001 4835-219-77374 _'_ ] SIGNAL/DE FLECTION/HIGH MODULE VOLTAGE EMV103A001 PRO-LOGIC MODULE A10467A001 4835-219-77383 4835-219-97107 2X12.5W AMp AMPO19AfX}I APW03_-_03 4835-219-7i413 AT M P 100W AUDIO AMp APW036B_O2 I 4835-219-77377 I_'OWER SUPF_Y FOR AVIO JACK PANEL AVJ110A001 4835-219-77369 J 30 POWER SUPPLY FOCUS/G2 DISTRIBUTION BLOCK 220493-3 4835-10%97018 FIGURE 6 - PTV430 RearView 2_ 77375 _ _ v_o r ........ l I /// __ ._ _ .... /// 4s_ I---- I ............................ ._) _-/" /////////////////////// FIGURE 7 - PTV400 Block Diagram ' 31 T401 FULL.POWER TRANSFORMER m 155VDC 120VAC q RECTIFIER BRIDGE IN FULL-POWER I _ 15V _ 9v )) 26V REGULATOR 401 L 3.1V I Glo _7S IN 2.5v OUTPUT VOLTAGE REGULATOR IC405 OPTO-ISOLATOR _3 IC401 R416 DUAL 15 CONTROLLER 2.3V 13..= ON/OFF _2 • T_2 OPTO-ISOLATOR IC406 15V-STBY STANDBY ON/OFF FOR 12.5W AMP 12.5V RUN • .... F" 84,'1 ,,t B,,,, TRANSFORMER / ! _,,vJ,G SOURCE S '_ " Itfl I:= " I 5V REG 5V-STBY 130V 13.5V ADJUST _1r 10 7 3.5V 3 4V 1 3V 9 R469 41 UNDERVOLTAGE IC402 13.5V 8 12V 9 • CONTROL OVERVOLTAGE 'lb RESET 16 12 FIGURE 8 - PTV Power Supply Module Block Diagram 32 • POWER ON/OFF TO AUDIO AMP k TO POWER P467 A402 P402 ,_ AMP SMPS P462 J467 J462 13OVJ_ 3461 15V.A NIEU YELLOW , _ , I_V GND YELLOW 9V GND PLUG /'.o, 9V.A SOU_RED _403 P403 _03 5v STeY S "A" BOARD _VIISV J403 GND I_'V.A _TBy WHITE _ • WHITE ) PLUG RESET •P" BOAR_ POWER SUFf_Y 404 15V-B ISV.B (_rB_ RED PLUG 13_ J406 _V2 "v_3"_"4 v P46_ P*O_R ON ) GROUND FROM ANTENNA • INPUT FIGURE 9 - PTV400 Power Supply Connections IjTO t2.5_N I= AMP k 33 Tgo0 HV _F_qU_R I TF-jS W_4 WX_'_ F_OU_CY _ECK i. wl E O_,ER mEous_:y iw -. • q_ 0901 S¢_UTDOe_ _' R_3 HKU4 _LTAGE ADJ_T • VEP_ 34 = SMD (SURFACE MOUNTED DEVICE) TO F_CTURE TUBES FIGURE 10- PTV400 Shutdown Circuitry _'GH VOLTAGE TPI __ l oecooe. /_--_ ; 300t_Z _EP CCD _lV COMB _A,==, / ' _ " SHUTOOWN _'_"' HV SYNC FRO(_qOA 2m/ RLTER "_ = CHAR GEN _ HIGH V_TAGE BLEEDER HV © 7O4 c _VMOV R L'/L 1_ _L QT_ RBOVR 0703 _02_ "_IO _ _ R_g SUB CGNT • _ L-_04 _401 .L _14 oc_TED _olJNo Icl Io --I : J TPllB ICg01 I TIler: ST OFF PROCESSOR I _ , TI_: LEFT OUT HOT DVR © VERT I'_JI u_°_ _ _I .c_z T _Isc _c _ out i°_ [01 OsO_ _ A Y BUFF _._ _R Y_ UP;TUNER _p4 o= FOLLO_IV,_ TE_T FONTS T_4: I_PS_ I_SV _ _N HVOT m _LE SVMDVR lpJ H _jL_ E _ TPS* _DEO J TEST Rm RUg 8LR_, _ Hk r_ J_O _I_DTH J620 ".10 HGT RE D LL GF4_N LL 0 O 0 o 0 0 0 _'_,__ JS0t J511 BLUE LL FIGURE 11 - PTV400 Signal/Deflection Module Layout 35 PTV410 JK1 INT/EXT PTV420 NOT USED PTV430 S-VHS2 SENSE _5 D225 D250 RIGHTSPEAKER TUN AUD LEFT NOCONNECTION TUN AUD RIGHT GND -4 GND < LEFT SPEAKER J610 A610 D610 I J610 )466 ,_ J466 SCL 4 =1) _D SDA J S_ L_ GND 4 LEFT OUT L.410 "A' BOARD S_N_._ER£ CTI_I i D410 J410 JK2_) 15¥ STANDOY °D° BOARD J275 PRO_OGIC RIGHT NV D620 GND _'_ N_ SUPPLIES 4 4 _-0 -_v D275 GND _v DERIVED I= 14V AVIO JACK PANEL _ Ft BOARD RIGHTOUT 15V_ ST,_I_By SCAN PRO-LOGIC 14v JKI I') l_V TO GND _oP_z PULSE PRO4.OGIC LEFT q FROM PRO-L(X;IC BOARD Sg_ TUNER VIDEO d2_ G_ )276 ,SUOWOOFER _.9.5V PRO-LOGIC FROM BOARD -k AUXVIDEO _52 RIGHTSS _ITIENCCA INRJT ER e, N0 _ 12.SW/CH AMP FROM KEY FIGURE 14 - PTV400 Jack Panel Connections 38 ,sDle • = VOLT/,_-ESOU_E l- = SIGNAL SOURCE "N"BOARD RED CRT J580 SCREEN FOCUS _9 A600 14V ,.=600 YELLOW "A° BOARD E600 J600 \ RED DRIVE GNC GREEN DRIVE PLUG DAG RED PLUG J_ GND BLUE DRIVE YELLOW PLUG t 'E'BOARD J401 130V • --=_ll_ 220V m SCAN DERIVED _ _ 14V FIL -20V PLUG SUPPLIES _ -HORIZ PULSE A401 220V E401 --_ _ GREENCRT ---_BLUESVM J577 NO CONNECTION 130VoB ---I_GREENSVM FILAMENT FILAMENT PLUG J576 YELLOW °20V _RED SVM J575 J525 +HORIZ PULSE +9,5V -9.5V 28V H01 SVMb_ DAG WHITE PLUG J581 YELLOW SCREEN I_ FOCUS !i,_ __ --0 _ II _, J ; o_ 0658 FOCUS \ J582 SCREEN _f WHITE PLUG ) DAG 9_e_,7"O" BOARD r_4 BLUE CRT RGURE 15 - PTV400 CRT Connections 39 "C" BOARD IR RECEIVER ARR012 4835-219-77378 "D" BOARD JACK PANEL MODULE 00AVJ108 4835-2! 9-77367 "B" BOARD KEYBOARD/LED 00ASWI04 4835-21977379 "L" BOARD 5 WATt'/CHANNEL 00AMP017 4835-21 9-57353 AMP RED CRT 00APT096 "N" BOARD 4835-219-77387 "P" BOARD POWER SUPPLY MODULE APW034 4835-219-77389 "A=BOARD SIGNAL/DEFLECTION 00EMV101 4835-219-97105 MODULE "E"BOARD GREEN CRT 00APT095 4835-219-77386 "O" BOARD BLUE CRT 00APTt00 4835-219-77388 FOCUS/G2 DISTRUBUTION BLOCK 220493-3 4835-101-97018 "R" BOARD CONVERGENCE 00A10435 4835-219-77382 MODULE FIGURE 16 - PTV410 Simplified Diagram 40 I