Transcript
WQ-740W/WQ-780W
SERVICE MANUAL No. S7862WQ780W//
WQ-740W WQ-780W
WQ-740W
• In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified should be used.
DIFFERENCE BETWEEN WQ-740W AND WQ-780W WQ-740W Auto Reverse
None
WQ-780W Used
WQ-780W
CONTENTS
Page AC POWER SUPPLY CORD AND PLUG ........................................................................................................................... 1 SPECIFICATIONS ............................................................................................................................................................... 2 VOLTAGE SELECTION ....................................................................................................................................................... 2 FITTING OF DIAL POINTER ............................................................................................................................................... 2 NAMES OF PARTS ............................................................................................................................................................. 3 DISASSEMBLY .................................................................................................................................................................... 4 ADJUSTMENT ..................................................................................................................................................................... 5 NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 6 VOLTAGE ............................................................................................................................................................................ 7 TYPES OF TRANSISTOR AND LED ................................................................................................................................... 7 SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ................................................................................................. 8 PARTS GUIDE / EXPLODED VIEW
AC POWER SUPPLY CORD AND PLUG 9FF24801830210
9FF26802125120
9FF24801600292
9FF26802125210
SHARP CORPORATION
This document has been published to be used for after sales service only. The contents are subject to change without notice.
WQ-740W/WQ-780W FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.
SPECIFICATIONS ● Radio section
● General Power source:
Power consumption: Output power:
Speakers: Input terminal: Output terminal: Dimensions: Weight:
AC 110-127 V/220-240 V, 50/60 Hz DC 15 V ["D" size (UM/SUM1, R20 or HP-2) battery × 10] 20 W PMPO; 120 W (60 W + 60 W) (AC operation) MPO (Max.); 30 W (15 W + 15 W) (AC operation) RMS; 15 W (7.5 W + 7.5 W) (DC operation, 10 % T.H.D.) 12 cm (4-3/4") free-edge speaker × 2 5 cm (2") surround speaker × 2 MIC 1/2; 1 mV/600 ohms CD/LINE; 350 mV/47 kohms Headphones; 16-50 ohms (recommended; 32 ohms) Width; 630 mm (24-13/16") Height; 205 mm (8-1/8") Depth; 215 mm (8-1/2") 5.3 kg (11.7 lbs.) without batteries
Frequency range:
FM; 88 - 108 MHz SW1; 2.3 - 7.3 MHz SW2; 7.3 - 22 MHz MW; 526.5 - 1,606.5 kHz
● Tape recorder section Frequency response: Signal/noise ratio: Wow and flutter: Motor: Bias system: Erase system:
60 - 12,000 Hz (Normal tape) 40 dB (TAPE 1, recording/playback) 55 dB (TAPE 2, playback) 0.15 % (WRMS) DC 15 V electric governor AC bias Magnet erase
Specifications for this model are subject to change without prior notice.
VOLTAGE SELECTION Before operating the unit on mains, check the preset voltage. If the voltage is different from your local voltage, adjust the voltage as follows: Slide the AC power supply socket to the visible indication of the side of your local voltage.
FITTING OF DIAL POINTER 1. Remove the main PWB. Attach the dial pointer as shown arrow A on the front cabinet, putting it into the section indicated by arrow B . 2. Install the main PWB in the front cabinet and secure it with the four screws. 3. Turn the tuning control knob in the direction indicated by C . Set the dial pointer to point "0", and then make the rest of the adjustments.
Dial Pointer (234)
Front Cabinet Dial Pointer (234)
"0" Point
A
C
Tuning Control Knod (233)
B
Dial Drum (231)
Main PWB Figure 2
–2–
Screw (608) ø3x10mm
WQ-740W/WQ-780W
NAMES OF PARTS WQ-740W 12
1
13 14
2 3 4 5 6 7 8 9 10 11
15 16 17 18 19 20 21 22 23
32 33
34 35
28 29 30
24 25 26 27
31 36
11. (TAPE 1) Cassette Compartment 12. (TAPE 1) Record Button: 13. (TAPE 1) Play Button: 4. (TAPE 1) Rewind Button: 15. (TAPE 1) Fast Forward Button: 16. (TAPE 1) Stop/Eject Button: 17. (TAPE 1) Pause Button: 8. (TAPE 2) Play Button: 9. (TAPE 2) Rewind Button: 10. (TAPE 2) Fast Forward Button: 11. (TAPE 2) Stop/Eject Button: 12. (TAPE 2) Cassette Compartment 13. Full-Range Speaker
14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26.
Surround Speaker Mixing Microphone Sockets Mixing Microphone Volume Control Surround On/Off Switch Surround Mode Select Switch Function Selector Switch Surround Mode Indicators Band Selector Switch Tuning Control Fine Tuning Control Sound Level Meter Power Indicator FM Stereo Indicator
37 38
27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38.
Built-in Microphone Dubbing Speed/Built-in Microphone/FM Mode Switch Extra Bass Control: X-BASS Graphic Equalizer Controls Volume Control FM/SW Telescopic Rod Aerial CD/Line Input Sockets Headphone Socket Beat Cancel Switch Battery Compartment AC Power Input Socket AC Voltage Selector
WQ-780W 13
1
14 15
2 3 4 5 6 7 8 9 10 11 12
16 17 18 19 20 21 22 23 24 33 34
29 30 31
25 26 27 28
11. 12. 13. 4. 15.
(TAPE (TAPE (TAPE (TAPE (TAPE
1) 1) 1) 1) 1)
Cassette Compartment Record Button: Play Button: Rewind Button: Fast Forward Button:
35 36
32 37
13. 14. 15. 16. 17.
16. (TAPE 1) Stop/Eject Button: 18. 17. (TAPE 1) Pause Button: 19. 18. (TAPE 2) Reverse Mode Switch: 20. 21. 19. (TAPE 2) Play Button: 22. 10. (TAPE 2) Fast Wind Buttons: 23. / 24. 11. (TAPE 2) Stop/Eject Button: 25. 12. (TAPE 2) Direction Switch: 26.
(TAPE 2) Cassette Compartment Full-Range Speaker Surround Speaker Mixing Microphone Sockets Mixing Microphone Volume Control Surround On/Off Switch Surround Mode Select Switch Function Selector Switch Surround Mode Indicators Band Selector Switch Tuning Control Fine Tuning Control Sound Level Meter FM Stereo Indicator
–3–
38 39
27. Power/(TAPE 2) Play Direction Indicators
28. Built-in Microphone 29. Dubbing Speed/Built-in 30. 31. 32. 33. 34. 35. 36. 37. 38. 39.
Microphone/FM Mode Switch Extra Bass Control: X-BASS Graphic Equalizer Controls Volume Control FM/SW Telescopic Rod Aerial CD/Line Input Sockets Headphone Socket Beat Cancel Switch Battery Compartment AC Power Input Socket AC Voltage Selector
WQ-740W/WQ-780W
DISASSEMBLY Open Casette Holder (Left/Right) Open
Caution on Disassembly Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance: 1. Take cassette tape out of the unit. 2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit and remove the batteries from the unit. 3. Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing the unit, be sure to rearrange the leads where they were before disassembling. 4. Take sufficient care on static electricity of integrated circuits and other circuits when servicing. STEP 1
REMOVAL
PROCEDURE
Front Cabinet
(B3)x6 ø3x10mm
(B1)x1 ø3x20mm Tape Mechanism (C1)x1
(C3)x4
FIGURE
1. Battery Compartment Lid. ................................. (A1)x1 2. Screw ................... (A2)x1 3. Screw ................... (A3)x8 4. Socket .................. (A4)x1
4-1
Tape mechanism 1. Screw ................... (B1)x2 2. Socket (B2)x3 WQ-740W 2. Socket (B2)x4 WQ-780W 3. Open the cassette holder. 4. Screw ................... (B3)x6
4-2
3
Main PWB
1. Knob ..................... (C1)x1 2. Screw ................... (C2)x4 3. Socket .................. (C3)x5
4-2
4
Graphic Equalizer 1. Screw ................... (D1)x5 PWB
4-3
5
Volume PWB
1. Knob ..................... (E1)x1 2. Screw ................... (E2)x2 3. Screw ................... (E3)x1
4-3
6
Power PWB
1. Screw ................... (F1)x1 2. Bracket ................. (F2)x1
4-4
2
Front Cabinet/ Rear Cabinet
(B1)x1 ø3x20mm
(B2)x1 (C3)x1
(B2)x2
(C2)x4 Main ø3x10mmPWB (B2)x1 WQ-780W Only Figure 4-2
Graphic Equalizer PWB Front Cabinet Volume PWB
(E1)x1
(D1)x5 ø3x10mm
(E2)x2 ø3x10mm (A4)x1
(E3)x1 ø2x6mm
Lug Wire Figure 4-3
Main PWB
Front Cabinet
Rear Cabinet
(F2)x1
(A2)x1 ø2.6x10mm
Power PWB Pull
Rear Cabinet
(A1)x1
(F1)x1 ø3x10mm
(A3)x8 ø3x20mm
Power Transformer
Figure 4-1
Figure 4-4 –4–
WQ-740W/WQ-780W
ADJUSTMENT MECHANISM SECTION
TUNER SECTION
• Driving Force Check
fL: Low-range frequency fH: High-renge frequency
Specified Value
Torque Meter Play: TW-2412
• FM IF/RF
Tape 1: Over 60 g Tape 2: Over 50 g
• Torque Check (For WQ-740W) Torque Meter
Specified Value Tape 1
Tape 2
Play: TW-2111
30 to 60 g.cm
30 to 60 g.cm
Fast forward: TW-2231
55 g.cm more
55 g.cm more
Rewind: TW-2231
55 g.cm more
55 g.cm more
• Torque Check (For WQ-780W) Torque Meter
Tape 2
Play: TW-2111
30 to 60 g.cm
30 to 60 g.cm
Fast forward: TW-2231
80 to 135 g.cm
55 to 120 g.cm
Rewind: TW-2231
80 to 135 g.cm
55 to 120 g.cm
IF Detection
T201 T202
Input: FM Antenna Output:Pin 9 of IC202
Band Coverage Tracking
fL: L202 fH: TC202 fL(88.0 MHz): L201 fH(108 MHz): TC201
Input: Antenna Output: Headphone Socket (Load resistance: 32 ohms)
Specified Value/ Adjusting Point
Instrument Connection
Test Stage IF
T203
Input: Antenna Output: Pin 9 of IC202
MW Band Coverage
fL: L203 fH: TC203
Input: Antenna Output: Headphone Socket
(Load resistance MW Tracking fL(600 kHz): L206 fH(1,400 kHz):TC207 32 ohms)
• Head Azimuth Test Tape
Instrument Connection
MTT-114
Headphones Socket (Load resistance: 32 ohms)
* Open the cassette holder, and load the test tape directly into the mechanism. (Do not load the tape into the cassette holder.) • Tape Speed (Normal only)
MTT-111
Adjustment Point
Specified Value
SW1 Band Coverage
fL(2.3 MHz): L204 fH(7.3 MHz): TC204
SW1 Tracking
fL(2.6 MHz): L207 fH(6 MHz): TC209
SW2 Band Coverage
fL(7.3 MHz): L205 fH(22 MHz): TC205
SW2 Tracking
fL(8.5 MHz): L208 fH(19 MHz): TC210
Instrument Connection
Tape 1,2:VR501 3,000 ± 60 Hz Headphones Socket (Loadresistance: 32 ohms)
• VCO Frequency Adjustment Point
DECK SECTION
T301
100 kHz ± 4 kHz
Instrument Connection Pin 13, Pin 21 and ground of IC202
Note: After preparing the test circuit shown in Fig. 5, connect the Pin 13, Pin 21 and ground of the IC202 with the test circuit, and measure the value.
• Bias Oscillation • Beat Cancel Switch: A Specified value
Specified value 76 kHz ± 200 Hz
VR201
Adjustment Point
Instrument Connection
• AM IF/RF
Specified Value Tape 1
Test Tape
Specified Value/ Adjusting Point
Test Stage
Instrument Connection Pin 1 of CNS108
Pin 21 of IC202
Pin 13 of IC202 Specified Value Beat Cancel
A: 100 ± 4 kHz B: 94 ± 4 kHz C: 104 ± 4 kHz
D
FET: 2SK212 (or Other 2SK Type FET.)
G
10 pF
S
1M ohm
0.1 µF 10K ohm
TO FREQUENCY COUNTER
Figure 5 VCO FREQUENCY TEST CIRCUIT –5–
WQ-740W/WQ-780W CNS110 T301
BIAS OSCILLATION
fL fH
1
T203
IC201 L201 L202
AM IF 9
VCO FM DETECTION fH fL
SW2 TRACKING
1 TC 201
IC202 13
21
T202
VR201 TC210
TC 202
TC 207 TC 203
TC209
L203 fL MW BAND COVERAGE
TC204
CNS108 1 2 3 4
fH SW1 BAND fL COVERAGE
TC205
FM TRACKING
fH FM BAND fL COVERAGE
FM IF T201
L204 fL SW2 BAND fH COVERAGE
L205
MW BAND fH COVERAGE
L208 MW TRACKING
SW1 TRACKING
fH fL
fH fL
MAIN PWB SW1
MW L206
L207
Figure 6 ADJUSTMENT POINTS
NOTES ON SCHEMATIC DIAGRAM •
•
•
•
•
Resistor: To differentiate the units of resistors, The symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is an ohm resistor. The resistor designated “Fusible” is a fuse type resistor. Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means pico-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression “capacitance/withstand voltage” is used. (CH),(RH),(UJ): Temperature compensation (ML): Mylar type (S): Styrol type The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given. Schematic diagram and Wiring Side of P.W. Board for this model are subject to change for improvement without prior notice. Parts marked with “ ” ( ) are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
REF. NO.
DESCRIPTION
POSITION
SW201
BAND SELECTOR
FM
SW301
BEAT CANCEL
C
SW302
RECORD/PLAYBACK
PLAYBACK
SW401
SURROUND MODE
LIVE
SELECT SW402
SURROUND ON/OFF
SW403
SW404
DUBBING SPEED/ HIGH/FM STEREO BUILT-IN MICROPHONE/ FM MODE FUNCTION SELECTOR TAPE
OFF
SW501
TAPE 2 MAIN
SW502
TAPE 1 MAIN
OFF
SW503
TAPE 2 PLAY
OFF
SW504
TAPE 2 DIRECTION
A
OFF
(WQ-780W Only) SW505
–6–
VOLTAGE SELECTOR
AC220-240V
WQ-740W/WQ-780W
VOLTAGE TRANSISTOR
IC103 (AN6884): Sound Level Meter 1 2 PIN 6.13V 6.16V RADIO 6V TAPE PLAY 6V 6V 6V TAPE REC
3
4
5
6
7
8
9
6V
6V
0V
6V
0V
0V
6.5V
6V
6V
0V
6V
0V
0V
6.5V
6V
6V
0V
6V
0V
0V
6.5V
Q101 Q102 Q103 Q106 Q107 Q108 Q202 Q203 Q301 Q302 Q303 Q401 Q402 Q501 Q502 Q503 Q504 Q505 Q506 Q507 Q508 Q509
IC201 (LA1186N): FM Front End PIN FM AM TAPE
1
2
3
4
5
6
7
8
9
1V
1.8V
0V
0V
0V
5V
1.4V
4V
5V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
IC202 (LA1805): IF Amp, & FM MPX. PIN FM AM TAPE PIN FM AM TAPE
RADIO e
1
2
3
4
5
6
7
8
9
10
11
12
1.4V
1.4V
5.6V
0.6V
1.5V
0V
0V
0V
2.3V
2.3V
5V
1V
1.6V
1.6V
6V
0.6V
0V
0V
0V
0V
2.4V
2.4V
0.5V
1V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
13
14
15
16
17
18
19
20
21
22
23
24
1V
1V
2V
1V
1.8V
1.5V
1.6V
0.4V
5.7V
1.8V
1.8V
1.8V
1.8V
1.8V
1.6V
0.6V
6.6V
6.6V 1.67V 1.67V 1.4V
0V
0V
0V
0V
0V
0V
0V
0V
0V
b
TAPE PLAY c
e
b
c
0V
0.63V 3.27V
0V
0.63V 3.27V
0V
0.63V 3.35V
0V
0.63V 3.35V
TAPE REC e
b
c
7.36V 6.52V 7.28V 7.36V 6.52V 7.28V 0.69V 0.1V
0V
0V
0.69V
0V
7.38V 6.54V 7.3V 7.38V 6.54V 7.3V 7.98V 7.37V 13.67V 7.98V 7.37V 13.67V 0.32V 0.98V 2.88V 0.32V 0.98V 2.88V 0.32V 0.98V 2.85V 0.32V 0.98V 2.85V 0.27V 0.27V
0V
0V
0V
0.4V
0V 0V
0.27V 0.27V 0.05V –0.18V 6.2V 0V
0.4V
0.5V 1.18V 5.53V 0.5V 1.18V 5.53V 0.5V 1.18V 5.53V 0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
7.43V 8.06V 13.14V 7.43V 8.06V 13.14V 0V
0V
0V
–1.74V
0V
–
0V
0.7V
0V
0V
15V
0V
8.8V
15V
0V
8.8V
0V
0V
0.70V
0V
–
0.7V
0V
0V
0.7V
0V
0.7V
0V
0.74V 0.12V
15.01V 14.23V 14.98V 15.01V 14.23V 14.98V 0V
0.74V 0.12V
0V
0.74V 0.12V
1.93V 2.57V 3.82V 1.93V 2.57V 3.82V 1.93V 2.57V 3.82V 0V
0V
0V
0V
0V
0V
5.7V 1.62V 1.62V 0V
0V
0V
IC301 (TA8189N): Record/Playback Amp. 1 2 3 4 5 6 PIN RADIO 0.98V 0.98V 2.11V 1.57V 5.7V 4.8V TAPE PLAY 0.98V 0.98V 2.11V 1.6V 5.7V 4.8V TAPE REC 0.98V 0.98V 2.11V 1.6V 5.7V 4.8V 13 PIN RADIO 1.4V TAPE PLAY 1.4V TAPE REC 1.4V
7
8
9
10
11
12
0V
0V
2V
1.2V
0V
0V
0V
0V
2V
1.2V
0V
0V
0V
0V
2V
1.2V
0V
0V
14
15
16
17
18
19
20
21
22
23
24
0V
1.29V
2V
1.4V
5.8V
0V
5.7V
5.3V
2V
1V
1V
0V
1.29V
2V
1.4V
5.8V
0V
5.7V
5.3V
2V
1V
1V
0V
1.29V
2V
1.4V
5.8V
0V
5.7V
5.3V
2V
1V
1V
IC401 (BA4558): Ope Amp. PIN 1 2 3 RADIO 3.3V 3.3V 3.3V TAPE PLAY 3.3V 3.3V 3.3V TAPE REC 3.3V 3.3V 3.3V
4
5
6
7
8
0V
3.3V
3.3V
3.3V
6.7V
0V
3.3V
3.3V
3.3V
6.7V
0V
3.3V
3.3V
3.3V
6.7V
IC402 (LA4558): Power Amp. 1 2 3 4 5 6 PIN RADIO 14.5V 0.01V 1.1V 7.6V 0.6V 13.6V TAPE PLAY 14.5V 0.01V 1.1V 7.6V 0.6V 13.6V TAPE REC 14.5V 0.01V 1.1V 7.6V 0.6V 13.6V
7
8
9
10
0V
15V 13.7V 0.6V
0V
15V 13.7V 0.6V
0V
15V 13.7V 0.6V
PIN 11 12 13 14 RADIO 7.6V 1.1V 0.01V 0V TAPE PLAY 7.6V 1.1V 0.01V 0V TAPE REC 7.6V 1.1V 0.01V 0V
FRONT VIEW
E B C
2SB1370 2SD2061 8050 C 9014 C 9015 C 9012 G
FRONT VIEW
IFR-523 HD IFR-553 PD
Figure 7 TYPE OF TRANSISTOR AND LED –7–
WQ-740W/WQ-780W WQ-740W
MW fL TRACKING fH
R201 10
C211 0.022
C243 7P(CH) SW201-F
MW ANTENNA
VC203
FM MW SW1 SW2
2
21
3
C231 0.022 2
FM IF
20
4
19
6
5
1
AM IF
C219 0.0082(ML)
17
8
7
16
15
14
R211 15K
13
9
VR201 10K(B) 10
11
C224 1/50
C529 0.022
R212 10
C232 220/16
L207 C229 0.022
L206,L207 MW/SW1 BAR ANTENNA
FM MW SW1 SW2
C235 10P(CH)
L203 R221 47
TC203
SW201-G FM C241 3P(CH) MW C239 0.0022 SW1 SW2 TC204 R220 220
SW1 ANTENNA L208
C TC210
MW OSC. L204
C236 5P(CH)
SW1 OSC.
C240 0.0047
VC204 C245 12P(CH)
TC205 SW2 fH TRACKING fL
SW2 ANTENNA
VR202 5K(B) FINE TUNING
C237 5P(CH)
fH fL SW2 BAND COVERAGE
C227 1/50
C228 SW201 SW201-H BAND SELECTOR 1/50 FM R214 SW201-A 12K MW SW1 R222 47 SW2 C233 0.022 fL SW1 BAND fH COVERAGE
R216 2.2K
SW201-C
C238 360P
C244 5P(CH)
TC209
SW201 BAND SELECTOR
C242 0.022
L205 SW2 OSC.
SW201-D FM MW SW1 SW2 R218 R213 100 12K
C256 0.022
D527 1N4148
C534 4.7/50
R215 2.2K
Q509 9014 C
C520 0.0033(ML)
13
R364 1M
C304 0.001
F R-CH C527 470
6
5
7
9
10
11
C314 4.7/50
L302 2.7mH
TAPE RADIO CD/LINE
R362 270
G
R454 2.2K
C357 120P
C356 430P
R-CH
R533 VR501 47K 470(B)
C353 0.0056(ML) C354 0.01(ML)
SW403-B HIGH/FM STEREO R510 NORMAL/FM STEREO P R 10K MIC/FM MONO SW302-A P SW302 R512 RECORD/ 10K PLAYBACK R R330 100
Q503 9015 C TAPE SPEED CONTROL
D201 1N4148
R412 12K R410 R405 12K 10K
C416 220/16
C410 4.7/50
R560 56K
R413 10K
R409 12K R411 12K
R407 2.7K
R506 3.9K
C412 1/50 1
6
R403 10K
5
IC401 BA4558 OPE AMP.
C413 1/50
– (2/2) + 4
7
SW302-F
Q301 8050 C BIAS OSC.
R453 2.2K
TAPE SPEED R561 47
C521 0.0033(ML)
8
+ (1/2) –
C411 4.7/50
R355 18K
SW403 DUBBING SPEED/ R323 BUILT-IN MICROPHONE/ 10K FM MODE R333 27K
T301 BIAS OSCILLATION
GND
J2 CD/LINE
SW404 FUNCTION SELECTOR
R314 22K
R318 2.2K
R332 10
C352 100/16
C351 0.022
L-CH
A B C
R247 1K
SW404-D
R368 18K
AC BIAS CIRCUIT
C355 0.0015(ML)
SW301 BEAT CANCEL R452 47K
C261 1/50
R321 12K
L303 22mH
R408 2.7K
C263 1/50
R241 150K
C362 0.015(ML) C517 150P
R243 100
12
C316 330P
C318 10/16
2
Q203 9014 C LINE AMP.
R320 180K
R304 180K
R306 56
8
3
R245 100
C259 1/50
C312 0.0082(ML)
C366 330P
C306 33/16
C515 130P
14
R316 330K
C302 0.001(ML)
LB GB RB
4
R324 10K
1 2 3
15
C320 4.7/50
3
C310 4.7/50
2
C323 22/16
1 2 3
16
R312 4.7K
1
CNS107
CNH107
PLAYBACK HEAD L-CH
17
R325 10K
R
C364 330P TAPE2
18
C308 0.033(ML)
P
19
R308 150K
R
20
IC301 TA8189N RECORD/PLAYBACK AMP. R310 3.9K
P
21
IC401 BA4558 OPE AMP.
C409 0.0033(ML)
22
C258 1/50
C415 100/16
C315 330P
R250 18K
23
Q202 9014 C LINE AMP.
R563 2.7K
R317 180K
R562 2.7K
R249 18K
C338 47/16
24
SW302-E SW302-D
RADIO CD/LINE
TAPE
C313 4.7/50
C363 330P
E
R240 150K
R361 270 C317 10/16
R406 330
C262 1/50
R404 10K
R303 180K
R246 1K
C401 470/16
C365 330P
C326 2.2/50
ERASE HEAD
C309 4.7/50
C305 33/16
R313 22K SW404-C SW404 FUNCTION C260 SELECTOR 1/50
R315 330K
R401 100
R354 18K
C408 0.0033(ML)
C319 4.7/50
R309 4.7K
R307 3.9K
+
C303 0.001
C327 1000/10
R311 150K
R532 47K
R367 18K
R319 C361 2.2K 0.015(ML)
C307 0.033(ML)
R328 100
C325 47/16
LA GA BA RA
C311 0.0082(ML)
L361 2.7mH
R326 33K
R305 56
1 2 3 4
R559 100K
R
C301 0.001(ML)
1 2 3 4
R-CH
P
CNS108
CNH108
D
R
D521 1N4148
DUBBING CONTROL
C528 470P
L304 22mH
SW302 RECORD/PLAYBACK SW302-C SW302-B P
R322 12K
R513 10K
R451 47K
C404 10/16 R508 10K Q504 9014 C TAPE TAPE SPEED CONTROL
IC502 KA7809 VOLTAGE REGULATOR 1
3 2
Q505 9014 C TAPE SPEED CONTROL
C512 0.1
C511 220/16 L501 47µH
FM SIGNAL MW/SW1/SW2 SIGNAL PLAYBACK SIGNAL
R336 100
RECORD SIGNAL
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6. 1
2
3
4
Figure 8 SCHEMATIC DIAGRAM (1/6) –8–
5
CD/L RA TA
4
D516 1N4148
R223 47
R327 100K C321 130P
C516 150P
TAPE1 RECORD/PLAYBACK HEAD L-CH
0
VCO
12
3
2 CF203 460kHz AM IF
MW BAND COVERAGE fH fL
fL SW1 fH TRACKING
18
T203
SW201 BAND SELECTOR FM R219 MW 100 SW1 SW2 SW201-E
L206
TC207
1
T201
R204 100
C210 10/16
22
HIGH/FM STE
FM MW SW1 SW2
B
C204 0.001
23
MIC/FM M NORMAL/FM STE
IC202 LA1805 IF AMP.& FM MPX.
FM IF R206 CF202 47 10.7MHz 1 3
D203 1N4148
R203 22K fL fH FM TRACKING
24
C213 10/16
fL FM BAND fH COVERAGE
R210 150K
C222 3.3/50
C225 0.012(ML)
C214 0.022
R202 33
R209 12K
R208 3.9K
FM DETECTION
C221 3.3/50
R205 220K
9
C207 3P
L202
C203 22P(CH)
VC201
TC201
2 FM RF L201
8
7
C226 0.012(ML)
6
5
C230 22/16
CF201 BAND PASS FILTER 108MHz
3
4
C220 470P
C218 0.0047(ML)
T202
C208 33P(CH)
1
3
TC202
D202 1N4148
2
C212 0.022
VC202
SW201-B
1
C201 0.001
FM MW SW1 SW2
FM OSCILLATION C206 20P(CH)
SW201 BAND SELECTOR
C202 0.001
FM/SW ROD ANTENNA
A
R207 820K
IC201 LA1186N FM FRONT END
6
WQ-740W/WQ-780W
SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/ FM MODE MIC/FM MONO
SW403-A
R531 1K
R557 1K
R345 1K
L/FM STEREO H/FM STEREO
Q302 9014 C R341 MUTE 10K
C342 470/16
R346 470K
C341 4.7/50
R552 4.7K
MIC2
R555 4.7K
MIC1
C344 4.7/50
Q303 9014 C MIC AMP.
MICROPHONES
C532 500P
MIC VOLUME
D520 1N4148
C223 0.0015
VR301 50K(B)
R344 4.7K
R565 5.6K R556 150K
Q508 9014 C MIC AMP.
C533 4.7/50
C343 500P
C536 47/16 R343 330
R558 33
R553 680
C345 0.0047(ML)
R534 4.7K
R554 680
1 R350 3.9K
R351 1K
C347 10/16
1
MIC101
C346 4.7/50
R349 2.2K
2
C529 0.022
CNS109
BUILT-IN MICROPHONE
2 CNH109
R217 330
HALL
OFF
SW401 SURROUND MODE SELECT
D402 1N4148
LIVE
LIVE
D515 1N4148
HALL
SW401-A SW401-D
C530 4.7/50
P12 1-F
CN4
SW401 SW401-B SURROUND MODE SELECT
SW404 FUNCTION SELECTOR
FROM GRAPHIC EQUALIZER PWB CN207
C450 2.2/50(N.P)
TWL L-CH GND GND R-CH TWR
C459 2.2/50(N.P)
D517 1N4148
1 2 3 4 5 6
SP4 SURROUND
CNH106
ON
HALL
CD/LINE RADIO TAPE
L-CH SPEAKERS
1 2 3 4 5 6
SP2 FULL-RANGE
SP1 FULL-RANGE
C427 0.01(ML) D519 1N4001 Q402 9014 C POWER MUTE
R421 10K R442 10K
5 2
C424 0.0015(ML)
C422 1/50
3
C426 100/16
C421 1/50
D525 1N4148
D518 1N4148
R501 4.7 FUSIBLE
Q501 8050 C VOLTAGE REGULATOR
C432 0.18(ML) C430 100/16
7
R422 120
C429 100/16
9
J1 HEADPHONES
C431 0.18(ML) R423 120
11
C433 1000/10
8 C437 470/25
F1 Q506 2SB1370 SWITCHING
D509 1N4001
C505 10/16
T1.25A L250V
C469 220/16
R537 10K
POWER PWB-C F501 T2A L250V
C502 0.1
D523 1N4148
1
2
2
AC220-240V 50/60Hz AC110-127V 50/60Hz D502
D507 1N4001
C501 0.1
DC15V['' D '' SIZE(UM/SUM-1, R20 OR HP-2)BATTERYx10]
CNS102
5 4 3 2 1
R418 3.3K
C535 4.7/50
C537 10/16
5
5 4 3 2 1
C473 0.068
C471 820P 1
R471 8.2K
CNH102 VCC GND LO0 RO0 RI0 LI0
C407 10/16
BATTERYS
D501~D504'RL202DC
R419 3.3K
SO501 AC POWER INLET SOCKET AC110-127V/ 220-240V 50/60Hz
D501 D504
1
C503 0.1
SW404 FUNCTION SELECTOR
C504 0.1
D503
CNS110
TAPE
D505
C522 3300/25
SW505 VOLTAGE SELECTOR
T501 POWER TRANSFORMER
SW404-B CD/LINE RADIO
C508 0.1
C507 100/16
D524 1N4148 C414 0.0033(ML)
1
R535 330/1W
R502 680
13
4 6
D401 1N4001
R545 22K
C417 0.0033(ML)
R416 10K
C423 0.0015(ML)
Q401 9014 C POWER MUTE
R548 100 D522 1N4148 R564 22K
12
Q507 9014 C SWITCHING
C440 10/16
R440 27K D305 1N4148
FUSE RESISTOR
14
C425 100/16
R441 10K R420 10K
SP3 SURROUND
C428 0.01(ML)
10
IC402 LA4508 POWER AMP.
Q510 9014 C MUTE
R-CH SPEAKERS
C434 1000/10
CNH110
R567 22K
R415 10K
48
SW402-A
SW402 SW402-B SURROUND ON/OFF ON OFF
R566 100K D526 1N4148 SW404-A
1 2 3 4 5 6 7
SW402 SURROUND ON/OFF
LIVE
6 2
CNS106
LIVE
HALL
R450 4.7K SW401 SURROUND MODE SELECT SW401-C
R472 8.2K C472 0.068
VR401-A 50K(B) VOLUME
VR401-B 50K(B) VOLUME
1 2 3 4 5 6
C474 820P
VOLUME PWB-B1 FROM GRAPHIC EQUALIZER PWB
CNS101
CN205 P12 1-C 1 2 3 4 5 6 7 8 9
R568 1K
10
CNS105
1 2 3 4 5 6 + 7 – 8 B 9 A 10
SW502 TAPE1 MAIN SW501 TAPE2 MAIN SW503 TAPE2 PLAY
M
M501 TAPE MOTOR
CNS1
MAIN PWB-A
7
8
9
10
Figure 9 SCHEMATIC DIAGRAM (2/6) –9–
11
12
WQ-740W/WQ-780W WQ-740W PLAYBACK HEAD (300-4)
TAPE 2
RD
SW502 TAPE1 MAIN
CNS1
A
WH WH GR GR BL BL RD BK YL PK
1 2 3 4 5 6 7 8 9 10
WH
CNH107
WH
BK
SW501 TAPE2 MAIN
BK
RD
SW503 TAPE2 PLAY
TAPE MECHANISM GND
RECORD/PLAYBACK HEAD(300-2)
B
3 2 1
ERASE HEAD(300-3)
TAPE 1
WH
AB+BK
RD
BK
M501 TAPE MOTOR TAPE MECHANISM GND
E
D131
R636
R638 Q107
C106
D126
C105
D128
R615 D114 R614
D112
D130
R613 D111
R611
C148
R110 C123
R631
C177
R612 1 2 3 4 5 6 7 8 R167 9
C147
IC103
R168
R644 R106
R632
Q101
C B E
D113
E B C
R137
R135
R626
R645
R122 R118 R116 R111 R112
C105
C125
C124
C176
C B E
D135 D132
D136 D133 D129
D115
B VR101
C102
6
C118
Q102
C103
C180
Q106 E B C
R637
C149 B VR102
C116
R136
C126
R138
R102
C120
R104
R101
C122
1
B VR103
R124
R128
R130
R134
B VR104
R123
B VR105
R117
C113 R129
C11
1
C10
7
C10
9
C10
8
C110
2 C11
4 C11
R132
R629
7
D134
C182 R643
1
R628
C184
R651
R131
R103
C185
R183
R181
R642
A
C181
A
C121 R133
D
R184
8
14
A
R640 C191
R180
E C B
R650
A
Q103
R182
C183
A
17
C1
R10 09 R1C 11 5
R127
R107 R115
R119
R126 R121 R125
SOUND LEVEL METER
GRAPHIC EQUALIZER PWB-B2
VR101 X-BASS
330Hz
R113
C119
1KHz
R1
3.3KHz
R120
10KHz
CN207
1 2 3 4 5 6 7
VR102~VR105 GRAPHIC EQUALIZER
C
R169 1
5
R191 R471
R472
C473 1 2 3 4 5 6
CN205
C472
C471
VOLUME PWB-B1
1 2 3 4 5
VOLUME
L-CH
F
CNH102
C474
VR401
R-CH SP1 FULL-RANGE
SP2 FULL-RANGE
SP4 SURROUND
SP3 SURROUND
G BK
RD
CNH106 WH RD BK BK RD WH
RD BK RD RD
COLOR TABLE
H
1
BR
RD(R)
BROWN
RED
OR
YL
GR
ORANGE YELLOW GREEN
2
BL
VL
GY
WH(W)
BK
PK
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
3
4
Figure 10 WIRING SIDE OF P.W.BOARD (1/5) – 10 –
5
6 5 4 3 2 1
6
WQ-740W/WQ-780W
RD WH BK
MIC1 MIC2 R554
R555
C323
VR301
R531 R533
R355
R354
C521
SW402 SURROUND ON/OFF
A
C408
ON
IC401
C415
R450 SW401 C
R413
B A
D
HALL
R405
C
B
D
A
R566
D517 C220 R207
A
VC203
VC202
VC204
TC202
TC203
C243
C235
C242
R205
L203 R222
L204
SW403
TC205
R220
C238
TC204
C241
L205 R223
A
B
SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/FM MODE HIGH NORMAL MIC
VC201
VR202 FINE TUNING
TC207
C233
H
TC201
MAIN PWB -A L206 MW
L207 MW/SW1 BAR ANTENNA
SW1
(281) FM/SW ROD ANTENNA(277)
7
8
9
10
Figure 11 WIRING SIDE OF P.W.BOARD (2/5) – 11 –
11
12
FM STEREO FM MONO
T202
SW2 SW1 MW FM
SW201
D202
SW201 BAND SELECTOR
TC210
B
G C244
C214
L202
R221
C
F
TC209
R219
24
C203
R202
C245
C239
C207
D
E
C240
R204
6 7 8 9
C212
C534
D516 C210
C211
20
C237
R203 D203
L201
R209 C218
C236
R401
C204
C202
C401
L208
C222
R208
CF201 3 2 1
1 C201 2 3 4 5
D507
C219
C213
R201
C208
R247
13
IC202
C225
R216
R214
CF203 C226
5 C230
C206
R206
R218
STAND-BY
C409
C411
R210
C256
R212 Q202
CF202 1 2 3
VR201
15
1
IC201
R241
R246 R240 R245
VCO C223
LIVE
SW404 FUNCTION SELECTOR CD/LINE RADIO TAPE
R407
R411
R406
C413
R415
R403 R409
OFF
SW401 SURROUND MODE SELECT
ON
R412
C412
8 7 6 5
MICROPHONES
R349
C343
1 27 C5 R341 Q302
L302 C520
R532
R314
C532 R556 C341 C344 R534
C536 Q303
SW302 R312
C342
32 R
C320 C314 C312 R250
MAX
C221
C231
T201
R451
C B E
R243
Q504
C229 C B E
Q203
R513
C346 CNS109 C345
C517 R310
R308 C306
C366
C310
C364
R325
C316 C318
IC301 C327 R416 C404
R418 C414
C416
1 2 3 4
C417
R419
CNS102 CNS101
C410
R408 R410 R404
12 10
1 2 3
C258
Q503
R512
R453
C263
E B C E B C
E B C
VR301 MIC VOLUME MIN
SW402
R211
C228
C260
R508 Q505
R454
R-CH
C365
C363 R313
R327
C262 VR501
R452
E B C
B
C227 C224
T203
R561 TAPE SPEED
R213
R217
C259
C529
R510
R560 R506
R215
C261
L-CH
R346
BK C516 R311
C315 C313
R367
D521
1 2 3 4 5 6 7 8 9 10
J2 CD/LINE
R318 R362 C362
C232
CNS105
J2
R323
R324
SW404
D509
D507
R552
R368
R320 R316
D201
C450
R553
C533
L501
C511
R307
C319 R559
D305 R562
D523
CNS106
C512
C537
6 5 4 3 2 1
C407
C535
E B C
C325
D525 1 2 3 4 5
R558
MIC101 BUILT-IN MICROPHONE
R557
R304
12
C338
R328
D526
R568
C307
R336
C309 C305
C530
R548 C507 C421 Q401 Q402
C423 C424
Q510
10
R364
R326
E B C
R344
2
1 2
R343
Q508
5
15
C422
E B C
C304
13
R440
R442
F
R555
C326 C311
R249
3
C459
R309
R345
CN4
D522 R502 Q501
C425
C361
D524
2
R361
L361
R420
IC502 1
R441
E B C
R563
R423
R319
C469
IC402
C434
D401
C432
J1 HEADPHONE
R422
R315
C440
E
C302 R306 1
20 C317
Q509
C515
D
C303
R317
R421
C B E
C
C301 R305 24
R303
E B C
R564
C430
C431
C429
6 5 4 3 2 1
D515
D402
C351
14 13 12 11 10 9 8 7 6 5 4 3 2 1
C522
C428
CNS110
C426
P13 6-C
C505
C437
C433
C427
2 1
C B E
R567
CNH110
C528
B
2 3 4 CNS108
C347
R351 R350
CNS107 1 2 3
D520
D505
C508
Q301 C354
FROM POWER PWB
R322
1
C321
A
D519
B C E Q506 R501
R535
F1 T1.25A L 250V
1 2 3 4 5 6 7
CNH109 1
L303
L304
SW302 RECORD/ PLAYBACK PALY REC.
803C
E B C
Q507
C352 R545
D518
A
R330
R537 C355
B A
T301
C C356
B
C357
C
SW301
SW301 BEAT CANCEL
R333 C353
R332
1 2 3 4 CNH108
E B C
BK
BK
RD RD
WQ-740W/WQ-780W WQ-740W
FM SIGNAL
GRAPHIC EQUALIZER
1
R126 3.3K
VR105-A 100K(B)
VR104-A 100K(B) R128 1.5K
R136 680K
Q102 9014 C
R122 2.2K
R130 820
C114 100P
VR102-A 100K(B)
R120 4.7K
R116 5.6K
R138 3.9K C176 500P
R134 1K
R132 820
R191 100 R108 12K C116 0.022(ML)
1
C118 0.022(ML)
C120 0.012(ML)
C122 0.0068(ML)
R107 12K C115 0.022(ML)
R125 3.3K
R121 2.2K
R127 1.5K
C119 0.012(ML)
C117 0.022(ML)
VR105-B 100K(B)
R137 680K
C125 1/50
1K
R119 4.7K
R133
R115 5.6K
R135 3.9K
C177 500P
820
R113 8.2K
R129 820
R131
R645 68K
R109 18K
C105 0.022
R123 3.3K
R117 4.7K
Q101 GRAPHIC 9014 C EQUALIZER AMP.
C113 100P
6
R111 8.2K
VR103-B 100K(B) C111 0.0022(ML)
6
VR101-B 50K(B)
R105 12K
C
C109 0.0068(ML)
5
VR102-B 100K (B)
4
VR104-B 100K(B)
R104 560
R102 1K
C107 0.01(ML)
P9 10-G
3
C126 1/50
C124 1/50
2
CNS101
TO MAIN PWB
R114 8.2K
R118 4.7K
VR105-A VR105-B 10kHz
GRAPHIC EQUALIZER AMP.
CN205
C108 0.01(ML)
R103 560
R110 18K
C106 0.022
R101 1K
B
R644 68K
C103 470/16
C102 0.1
R112 8.2K
VR101-A 50K(B)
R106 12K
VR104-A VR104-B 3.3kHz
VR103-A 100K (B) C112 0.0022(ML)
X-BASS VR101-A VR101-B
VR103-A VR103-B 1kHz
C110 0.0068(ML)
A
VR102-A VR102-B 330Hz
C123 1/50
C121 0.0068(ML)
D
R182 33 Q103 2SD2061
C183 0.1
C184 10/16
R183 5.6K
R184 47K
C181 0.1
C185 10/16
HALL
R612 47
R611 47 D111
1
R168 470K C148 10/16
+B
3
CN4 P9 12-C
LIVE
4
C147 R167 10/16 82K
5
+B POWER
6
STEREO
+B
+B
R628 330
D135 D128 LIVE LIVE +B
R642 330
D132 LIVE
R629 330
D129 HALL
R643 330
D133 HALL
R626 330
SOUND LEVEL METER LED CONTROL
R637 56K
R636 1K
D136 HALL +B
D126,D128,D129 D132,D133 D135,D136
R638 56K
D134 1N4148
R650 330
G
Q107 9012 G
7
D130 STEREO
7
R651 330
D126 POWER
TO MAIN PWB
2
2
D112
F
3
D113
+B
GND
4
R613 47
15V
5
R614 47
1
1
R169 100 +B C149 1/50
6
7
D114
R632 56K CN207
8
9
R631 56K
D111~D113:IFR-553PD D114,D115:IFR-523HD
IC103 AN6884 SOUND LEVEL METER R615 47
D131
C180 100/16
R181 680
E
+B
VOLTAGE REGULATOR
C182 100/16
FUSIBLE
D115
R180 2.2
C191 22/16
R640 33K
Q106 9014 C SOUND LEVEL METER LED CONTROL
IFR-553PD
D130:IFR-523HD
GRAPHIC EQUALIZER PWB-B2
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6. 1
2
3
4
Figure 12 SCHEMATIC DIAGRAM (3/6) – 12 –
5
6
WQ-740W/WQ-780W
RD RD SO501 AC POWER INLET SOCKET AC110V-127V 50/60Hz AC220V-240V 50/60Hz
POWER PWB-C
RD
RD
CNH110 RD TO MAIN PWB 1 CNS110 BK 2 P11 7-C (WQ-740W)
1 2
P17 7-C (WQ-780W)
F501 T2A L 250V
D504 C504 D501 C501 D502 C502 T501 POWER TRANSFORMER
BK BL RD
COLOR TABLE
D503 C503
BR
BROWN
RD(R)
RED
WH
WH
OR
ORANGE
YL
YELLOW
GR
GREEN
BL
BLUE
VL
VIOLET
GY
GRAY
WH(W)
WHITE
BK
BLACK
PK
PINK
BK AC220-240V
(280)
BATTERYS DC15V [ "D" SIZE (UM / SUM-1, R20 or HP2) battery X10 ]
AC110-127V SW505 VOLTAGE SELECTOR
(281) (279)
7
8
9
10
Figure 13 WIRING SIDE OF P.W.BOARD (3/5) – 13 –
11
12
WQ-740W/WQ-780W WQ-780W
C214 0.022
R202 33
SW201 BAND SELECTOR
B
C204 0.001
R201 10
FM IF D203 1N4148
R206 47
L206
TC207
1
CF202 10.7MHz 1 3
2
3
4
2
FM IF
MW ANTENNA
SW201-F FM MW SW1 SW2
C219 0.0082(ML)
C221 3.3/50
17
16
14
15
R211 15K
13
6
5
8
7
9
VR201 10K(B) 11
10
12
0
VCO
T203
SW201-E R219 100
FM MW SW1 SW2
C243 7P(CH)
18
MIC/FM M NORMAL/FM ST HIGH/FM ST
T201
R204 100
C210 10/16
19
20
R210 150K
C222 3.3/50
IC202 LA1805 IF AMP.& FM MPX.
C231 0.022
C211 0.022
21
1
MW fL TRACKING fH
VC203
22
23
24
C213 10/16
fL FM BAND fH COVERAGE
R203 22K fH fL FM TRACKING
R208 3.9K
FM DETECTION
AM IF
SW201 BAND SELECTOR fL SW1 fH TRACKING
3
C224 1/50
2 CF203 460kHz AM IF
MW BAND COVERAGE fL fH
C225 0.012(ML)
C203 22P(CH)
C207 3P
L202
TC201
L201
VC201
2 FM RF
R205 220K
9
C226 0.012(ML)
CF201 BAND PASS FILTER 108MHz
8
7
R209 12K
C230 22/16
3
6
5
C218 0.0047(ML)
T202
C208 33P(CH)
1
4
VC202
D202 1N4148
3
C220 470P
C212 0.022
TC202
MW SW1 SW2
2
FM OSCILLATION C206 20P(CH)
FM SW201-B
1
C201 0.001
C202 0.001
A
SW201 BAND SELECTOR
FM/SW ROD ANTENNA
R207 820K
IC201 LA1186N FM FRONT END
C529 0.022
R212 10 C232 220/16
L207 C229 0.022
SW201-G FM C241 C239 MW 3P(CH) 0.0022 SW1 SW2 TC204 R220 220
SW1 ANTENNA L208
TC210
L203
SW1 OSC.
SW2 ANTENNA
VR202 5K(B) FINE TUNING
C237 5P(CH)
fH fL SW2 BAND COVERAGE
SW201-A
C233 0.022
fL SW1 BAND fH COVERAGE
TC205 SW2 fH TRACKING fL
FM MW SW1 SW2
R222 47
C240 0.0047
VC204
C245 12P(CH)
SW201-H MW OSC. L204
C236 5P(CH)
R214 12K
SW201-D FM MW SW1 SW2 R218 100 R213 12K
C256 0.022
D527 1N4148 C534 4.7/50
R215 2.2K
SW201 BAND SELECTOR
R223 47
C242 0.022
L205 SW2 OSC.
C227 1/50
C228 1/50
R221 47
FM MW SW1 SW2
C
L206,L207 MW/SW1 BAR ANTENNA
FM MW SW1 SW2
C235 10P(CH)
TC203
R216 2.2K
C244 5P(CH)
TC209 SW201-C
C238 360P
CD/L RA TA
D516 1N4148
R327 100K
C311 0.0082(ML)
C515 130P
11
C314 4.7/50
C316 330P
R368 18K
R362 270
L302 2.7mH R318 2.2K
TAPE RADIO CD/LINE
C318 10/16
R355 18K R533 47K VR501 470(B)
R453 2.2K
C353 0.0056(ML) C354 0.01(ML)
HIGH/ FM STEREO NORMAL/FM STEREO P R MIC/ SW302-A FM SW403-B MONO P SW302-F
R332 10
C352 100/16
R
R451 47K
C416 220/16
Q503 9015 C TAPE SPEED CONTROL
R560 56K
R413 10K
C411 4.7/50 R409 12K
R411 12K 6
R403 10K
5
C413 1/50
– (2/2) + 4
7
IC401 BA4558 OPE AMP. C404 10/16
IC502 KA7809 VOLTAGE REGULATOR
R508 10K R512 10K
SW302 RECORD/ PLAYBACK
C410 4.7/50
R407 2.7K
R506 3.9K
R510 10K
1
Q504 9014 C TAPE SPEED CONTROL
R513 10K
T301 BIAS OSCILLATION
GND
TAPE SPEED R561 47
C521 0.0033(ML)
SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/ FM MODE
R323 10K
AC BIAS CIRCUIT
Q301 8050 C BIAS OSC.
C263 1/50
R412 12K R410 R405 12K 10K
SW404 FUNCTION SELECTOR
R314 22K
C362 0.015(ML)
R330 100
A B C C357 C356 120P 430P
R247 1K
C261 1/50 SW404-D
C351 0.022
R454 2.2K
R250 18K
R320 180K
R333 27K
Q203 9014 C LINE AMP
R241 150K
R321 12K
C355 0.0015(ML)
L303 22mH
12
1
3 2
Q505 9014 C TAPE SPEED CONTROL
C512 0.1
C511 220/16 L501 47µH
FM SIGNAL MW/SW1/SW2 SIGNAL PLAYBACK SIGNAL
H
R336 100
RECORD SIGNAL
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6. 1
2
3
4
Figure 14 SCHEMATIC DIAGRAM (4/6) – 14 –
5
6
R416 10K
10
R243 100
C259 1/50
C412 1/50
8
+ (1/2) –
R415 10K
9
2
C415 100/16
8
7
3
R245 100
C409 0.0033(ML)
6
5
R304 180K
R306 56
C527 470P
SW301 BEAT CANCEL R452 47K
13
R364 1M
C323 22/16 C517 150P
R-CH
14
R316 330K
C304 470P
A
J2 CD/LINE
C366 330P
C306 33/16
SIDE-B
L-CH
4
R324 10K
LB GB RB
SW504-B SW504 TAPE2 DIRECTION
15
C320 4.7/50
3
C310 4.7/50
C302 0.001(ML)
1 2 3
16
17
18
R312 4.7K
2
R308 150K
R-CH
CNS107
CNH107 1 2 3
B
19
R325 10K
1
C364 330P
SIDE-B SIDE-A
20
R310 3.9K
R
A
B
21
C258 1/50
IC401 BA4558 OPE AMP.
R408 2.7K
C315 330P
C312 0.0082(ML)
22
C308 0.033(ML)
R P
23
Q202 9014 C LINE AMP
R563 2.7K
R317 180K
R562 2.7K
R249 18K
C313 4.7/50
IC301 TA8189N RECORD/PLAYBACK AMP.
L-CH
G
C317 10/16
R406 330
C262 1/50
R240 150K
R361 270
C338 47/16
SW302-D
SW302-E P
24
PLAYBACK HEAD SW504-A SIDE-A
F
C260 1/50
C363 330P
E
D201 1N4148
R246 1K
SW404-C
R315 330K
R401 100
R354 18K
R404 10K
R303 180K
R313 22K
C408 0.0033(ML)
C319 4.7/50
R309 4.7K
C365 330P
C326 2.2/50
+
C305 33/16
C303 470P
ERASE HEAD
R319 2.2K
C327 1000/10
R311 150K
C361 0.015(ML)
C307 0.033(ML)
C301 0.001(ML)
TAPE2
SW404 FUNCTION SELECTOR
C520 0.0033(ML)
R367 18K
TAPE RADIO CD/LINE
C325 47/16
LA GA BA RA
L361 2.7mH
R326 33K
R305 56
1 2 3 4
R532 47K
R
R328 100
P
C309 4.7/50
R-CH
R
R307 3.9K
1 2 3 4
P
CNS108
RECORD/PLAYBACK HEAD L-CH
CNH108
D
D521 1N4148
Q509 9014 C DUBBING CONTROL R559 100K
C528 470P
L304 22mH
SW302 RECORD/PLAYBACK SW302-B SW302-C
TAPE1
R322 12K
C401 470/16
C321 130P
C516 150P
WQ-740W/WQ-780W
SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/ FM MODE MIC/FM MONO
R531 1K
SW403-A R345 1K
AL/FM STEREO GH/FM STEREO
R557 1K
C533 4.7/50
R211 15K
R346 470K
C342 470/16
R555 4.7K
MIC1
MICROPHONES
C343 500P
R343 330
R558 33
MIC VOLUME
MIC2
C532 500P C536 47/16
D520 1N4148
R552 4.7K C344 4.7/50
Q303 9014 C MIC AMP.
Q508 9014 C MIC AMP.
Q302 9014 C MUTE
O
R344 4.7K C341 4.7/50
VR301 50K(B)
R341 10K C223 0.0015
R565 5.6K R556 150K
R534 4.7K
R554 680
R553 680
C345 0.0047(ML)
1 C347 10/16
R350 3.9K
R351 1K
R349 2.2K
2
C529 0.022
CNS109 CN2
R217 330 C232 220/16
1 2
A
SW402-A OFF
C450 2.2/50(N.P)
Q402 9014 C POWER MUTE C424 0.0015(ML)
3
SP1 FULL-RANGE
9
J1 HEADPHONES
C431 0.18(ML) R423 120
11
C433 1000/10
C502 0.1
POWER PWB-C
1
2
2
D501
DC15V[" D " ISIZE(UM/SUM-1, R20 OR HP-2)BATTERYx10]
CNS102
R418 3.3K
C537 10/16
5
5 4 3 2 1
C471 820P
CNH102 VCC GND LO0 RO0 RI0 LI0
C407 10/16
BATTERYS
D501~D504'RL202DC
5 4 3 2 1
SO501 AC POWER INLET SOCKET AC110-127V/ 220-240V 50/60Hz
AC220-240V 50/60Hz AC110-127V 50/60Hz
D507 1N4001
R419 3.3K
SW505 VOLTAGE SELECTOR
T501 POWER TRANSFORMER
D502 C503 0.1
1
F501 T2A L250V
C501 0.1
C522 3300/25
SW404 FUNCTION SELECTOR
D523 1N4148
C429 100/16
C437 470/25
Q507 9014 C SWITCHING
R537 10K
R422 120
7
C469 220/16
CNS110
D509 SW404-B 1N4001
TAPE
CD/LINE
D505
R545 22K
SP3 SURROUND
C430 100/16
8
T1.25A L250V
R535 330/1W
RADIO
C508 0.1
C507 100/16 C505 10/16
D524 1N4148
1 D401 1N4001 F1
Q506 2SB1370 SWITCHING
D522 1N4148
C414 C417 0.0033(ML) 0.0033(ML)
L-CH SPEAKERS
C432 0.18(ML)
6
C504 0.1
D518 1N4148
R501 4.7 FUSIBLE
Q401 9014 C POWER MUTE
R548 100
R502 680
12
C423 0.0015(ML)
13
Q501 8050 C VOLTAGE REGULATOR
D525 1N4148
D305 1N4148
C421 1/50
R420 10K FUSE RESISTOR
14
C425 100/16
R441 10K
C440 10/16
R440 27K
C426 100/16
R416 10K
SP2 FULL-RANGE
R-CH SPEAKERS
D504
C422 1/50
4
D503
R442 10K
R415 10K
1 2 3 4 5 6
C434 1000/10
C428 0.01(ML)
10
5 2
IC402 LA4508 POWER AMP.
R421 10K
CNH110
R567 22K
C535 4.7/50
1 2 3 4 5 6
SP4 SURROUND
C427 0.01(ML) D519 1N4001
R564 22K
TWL L-CH GND GND R-CH TWR
C459 2.2/50(N.P)
D517 1N4148
Q510 9014 C MUTE
12 0
CNS106
LIVE
HALL
LIVE
D402 1N4148
CN207 P18 1-F
CNH106
SW401 SURROUND MODE SELECT SW401-A
SW401-D
D515 1N4148
C530 4.7/50
FROM GRAPHIC EQUALIZER PWB
CN4
SW401-B SW401 SURROUND MODE SELECT
SW404 FUNCTION SELECTOR
HALL
HALL
ON
LIVE
LIVE
SW402-B SW402 SURROUND ON/OFF ON OFF
D526 1N4148 SW404-A
1 2 3 4 5 6 7
SW402 SURROUND ON/OFF
SW401-C
CD/LINE RADIO TAPE
SW504-C B
CNS2
1 2
SW504 TAPE2 DIRECTION
HALL
SW401 SURROUND MODE SELECT R566 100K
6 6
2 CNH109
R450 4.7K
6 2
27 148
BUILT-IN MICROPHONE MIC101
1
C346 4.7/50
C473 0.068
1
R471 8.2K
R472 8.2K
VR401-A 50K(B) VOLUME
VR401-B 50K(B) VOLUME
1 2 3 4 5 6
C474 820P
C472 0.068
VOLUME PWB-B1 FROM GRAPHIC EQUALIZER PWB
CNS101
CN205 P18 1-C 1 2 3 4 5 6 7 8 9
R568 1K
H
10
CNS105
1 2 3 4 5 6 + 7 – 8 B 9 A 10
SW502 TAPE1 MAIN SW501 TAPE2 MAIN SW503 TAPE2 PLAY
M
M501 TAPE MOTOR
CNS1
MAIN PWB-A
7
8
9
10
Figure 15 SCHEMATIC DIAGRAM (5/6) – 15 –
11
12
WQ-740W/WQ-780W WQ-780W
CNS2 2 1
SW502 TAPE1 MAIN
CNS1
A
WH WH GR GR BL BL RD BK YL PK
1 2 3 4 5 6 7 8 9 10
B
SW504 TAPE2 DIRECTION
A
TAPE 2
HEAD FLEXIBLE PWB
PLAYBACK HEAD (400-6)
SW501 TAPE2 MAIN SW503 TAPE2 PLAY
CNH107
RD
BK
GY
WH
WH
BK
3 2 1
RD BK
B
RECORD/PLAYBACK HEAD(400-4)
ERASE HEAD(400-5)
TAPE 1
WH
AB+BK
RD
BK
M501 TAPE MOTOR TAPE MECHANISM GND
E
R636
R638
D126
R184
C105
D114 R614 D113
E B C D112
D130
R613 D111
R611
R645 R110 C123
C148 R632
C177
R612 1 2 3 4 5 6 7 8 R167 9
C147
IC103
R168
R106
R631
Q101
C B E
R615
Q107
D131
R628
R626
D134
C106
D127
D115
R637
R137
R135
R627
D128
R644
R122 R118 R116 R111 R112
C105
C125
C124
C176
C B E
C180
D135 D132
D136 D133 D129
7
Q106 E B C
B VR101
C102
6
C118
Q102
C103
R629
1
C149 B VR102
C116
R136
C126
R138
R102
R101
C120
R104
R103
C122
1
B VR103
R124
R128
R130
R134
B VR104
R123
B VR105
R117
C113 R129
C11
1
C10
7
C10
9
8 C10
C110
2 C11
4 C11
R132
C182 R643
R651
R131
C184
R181
R642
C121 R133
D
C185
R183
C181
A
R650
A
R640 C191
R180
E C B
8
4
A
Q103
R182
C183
A
17
C1
R10 09 R1C 11 5
A
1 R1
R119
R126 R121 R125
R127
330Hz
SOUND LEVEL METER
GRAPHIC EQUALIZER PWB-B2
VR101 X-BASS
R107 R115
1KHz
R113
3.3KHz
R120
10KHz C119
CN207
1 2 3 4 5 6 7
VR102~VR105 GRAPHIC EQUALIZER
C
R169 5
1
R191 R471
R472
C473 1 2 3 4 5 6
CN205
C472
C471
VOLUME PWB-B1
1 2 3 4 5
VOLUME
L-CH
F
CNH102
C474
VR401
R-CH SP1 FULL-RANGE
SP2 FULL-RANGE
SP4 SURROUND
SP3 SURROUND
G BK
RD
CNH106 WH RD BK BK RD WH
RD BK RD RD
COLOR TABLE
H
1
BR
RD(R)
BROWN
RED
OR
YL
GR
ORANGE YELLOW GREEN
2
BL
VL
GY
WH(W)
BK
PK
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
3
4
Figure 16 WIRING SIDE OF P.W.BOARD (4/5) – 16 –
5
6 5 4 3 2 1
6
WQ-740W/WQ-780W
RD WH BK
MIC1 MIC2 R554
R555 VR301
R533
R355
R531
SW402 SURROUND ON/OFF
A
C408
ON
IC401
C415
R450 SW401 C
R413
B A
D
HALL
R405
C
B
D
A
R566
D517 C220 R207
A
VC203
VC202
VC204
TC202
TC203
C243
C240
C235
SW403
R220
C238
L202
C241
TC205
C239
TC204
A
B
C242
R205
SW403 DUBBING SPEED/ BUILT-IN MICROPHONE/FM MODE HIGH NORMAL MIC
VC201
VR202 FINE TUNING
TC207
C233
H
TC201
L203
L204 R222
R221
L205 R223
MAIN PWB -A L206 MW
L207 MW/SW1 BAR ANTENNA
SW1
(281) FM/SW ROD ANTENNA(277)
7
8
9
10
Figure 17 WIRING SIDE OF P.W.BOARD (5/5) – 17 –
11
SW2 SW1 MW FM
T202
12
FM STEREO FM MONO
SW201
D202
SW201 BAND SELECTOR
TC210 TC209
B
G
C214
C203
R202
C
F
C244
C237
R204
C212
C534
D516 C210
C211
D
E
C245
24
C236
R203 D203
C206
R401
R219 R208
CF201 3 2 1
1 C201 2 L201 3 4 5 6 7 8 C207 9
R209 C218
C213
R201
L208
C222 C219
20
1
C202
C401
13 15
IC202
R214
C225
5 C230
C208
T201
R247
VR201
D507
C221 10
C204
CF202 1 2 3 R206
C223
R218
STAND-BY
C409
C411
R210
C256
R212 Q202
R246 R240 R245
VCO
LIVE
SW404 FUNCTION SELECTOR CD/LINE RADIO TAPE
R407
R411
R406
C413
R415
R403 R409
OFF
SW401 SURROUND MODE SELECT
ON
R412
C412
8 7 6 5
MICROPHONES
R349
C343 C323
R341 Q302 R354
R532
C520
R250
R314
L302
C314 C312
R346 C532 R556 C341 C344 R534
C536 Q303
SW302 C342
R 32 1 C5 27
C320
IC301 C327 R416 C404
R418 C414
C416
1 2 3 4
C417
R419
C410
R408 R410 R404
12
C231
IC201
R241
R513
R451
C B E
R243
Q504
C229
1 2 3
C258 C B E
Q203
R512
R453
C263
Q503 R508
Q505
R-CH
C228
C260
E B C E B C
E B C
MAX
SW402
R211 CF203 C226
C262 VR501
R454
VR301 MIC VOLUME MIN
B
C227 C224
T203
R561 TAPE SPEED
R213
R217
C259
C529
R510
R560 R506
R215
C261
R216
1 2 3 4 5 6 7 8 9 10
L-CH J2 CD/LINE
C346 CNS109 C345
C517 R312
R310
R308 C306
C366
C310
C364
R325
C316 C318
C365
C363 R313
R327 CNS102 CNS101
CNS105
R452
E B C
C521
BK C516 R311
C315 C313
R367
D521
R318 R362 C362
C232
J2
R323
R324
SW404
D509
D507
R552
R368
R320 R316
D201
C450
E B C
R553
C533
L501
C511
C307
R336
R309
C319 R559
D305 R562
R563
D523
CNS106
C512
C537
6 5 4 3 2 1
C407
C535
R558
C325
D526
R568
R328
R344
MIC101 BUILT-IN MICROPHONE
R557
R304
12
C338
D525 1 2 3 4 5
10
R364
R326
E B C
2
1 2
R343
Q508
5
15
C422
Q510 E B C
C304
C326
R440
R442
F
R555
13
C311
R249
3
C459
R307 C309 C305
C530
R548 C507 C421 Q401 C424
Q402
C423
C428
C425
E B C
C361
C440
R441
R361
D524
2
R319 L361
R420
IC502 1
R421
E
C302 R306 1
20 C317 R315
Q509
C515
D
C303
R317
E B C
C B E
C
C301 R305 24
R303
C469
IC402
C434
D401
C432
R423
CN2 R345
CN4
D522 R502
D518
R422
J1 HEADPHONE
Q501
R501 C430
C431
C429
6 5 4 3 2 1
D515
D402
C351
14 13 12 11 10 9 8 7 6 5 4 3 2 1
C522
C426
P13 6-C
C505
C437
C433
C427
2 1 CNS110
C528
B
2 3 4 CNS108
C347
R351 R350
CNS107 1 2 3
D520
D505
C B E
R567
CNH110
R322
1
C321
A
D519
B C E Q506
FROM POWER PWB
1 2
C508
Q301 C354
F1 T1.25A L 250V
R564
R535
C352 R545
1 2 3 4 5 6 7
CNH109 1
L303
L304
SW302 RECORD/ PLAYBACK PALY REC.
803C
E B C
Q507
R330
R537 C355
B A
A
T301
C C356
B
C357
C
SW301
SW301 BEAT CANCEL
R333 C353
R332
1 2 3 4 CNH108
E B C
BK
BK
RD RD
WQ-740W/WQ-780W WQ-780W
FM SIGNAL
GRAPHIC EQUALIZER
A
VR102-A VR102-B 330Hz
X-BASS VR101-A VR101B
VR103-A VR103-B 1kHz
VR104-A VR104-B 3.3kHz
VR105-A VR105-B 10kHz R138 3.9K
CN205
VR105-A 100K(B)
R132 820
R136 680K
R134 1K
R108 12K C116 0.022(ML)
C120 0.012(ML)
C118 0.022(ML)
C122 0.0068(ML)
C124 1/50
R113 8.2K
R115 5.6K
R107 12K C115 0.022(ML)
D
Q101 GRAPHIC 9014 C EQUALIZER AMP.
R119 4.7K
R121 2.2K
C117 0.022(ML)
R125 3.3K
R127 1.5K
C119 0.012(ML)
R135 3.9K
R137 680K
VR105-B 100K(B)
R129 820
C177 500P
C113 100P
R645 68K
C105 0.022
VR104-B 100K (B)
R111 8.2K
6
C111 0.0022(ML)
R105 12K
VR101-B 50K(B) C107 0.01 (ML)
6
VR103-B 100K(B)
5
R123 3.3K
R117 4.7K
VR102-B 100K(B) C109 0.0068(ML)
4
C126 1/50
R104 560
R102 1K
R109 18K
3
GRAPHIC EQUALIZER AMP.
VR104-A 100K(B)
VR103-A 100K (B) C112 0.0022(ML)
R128 1.5K
R126 3.3K
R122 2.2K
R120 4.7K
C114 100P
2
CNS101 P15 10-G
TO MAIN PWB
R116 5.6K
C176 500P
R191 100
1
1
C
R114 8.2K
C110 0.0068(ML)
VR101-A 50K(B) C108 0.01(ML)
R103 560
R130 820
Q102 9014 C
R101 1K
R644 68K
C103 470/16
B
R110 18K
C106 0.022
C102 0.1
R124 3.3K
R118 4.7K
VR102-A 100K(B)
R112 8.2K
R106 12K
R131 820
C125 1/50
R133 1K
C123 1/50
C121 0.0068(ML)
R182 33 Q103 2SD2061 R183 5.6K
C184 10/16
C183 0.1
R181 680
C182 100/16
R184 47K
C180 100/16
D131
C185 10/16
5
R651 330
Q107 9012 G
+B
STEREO 7 R650 330
D135 LIVE
R628 330
D128 LIVE +B
R642 330
D132 LIVE
D126~D129 D132,D133 D135,D136
R629 330
D129 HALL
R643 330
R627 330
D134 1N4148
G
R611 47 +B
B-SIDE
6 7
C147 R167 10/16 82K
A-SIDE
D111~D113'IFR-553PD D114,D115'IFR-523HD
LIVE
4
1
R168 470K C148 10/16
+B
R626 330
D133 D127 D126 HALL A-SIDE B-SIDE
D130 STEREO
P15 12-C
TO MAIN PWB CN4
HALL 3
2
D112
R615 47
GND 2
3
R613 47
+B
4
R612 47
F
15V
R169 100
5
D113
1
1
+B C149 1/50
6
7
D115
R632 56K CN207
8
9
R631 56K
D111
IC103 AN6884 SOUND LEVEL METER R614 47
E
+B
VOLTAGE REGULATOR
C181 0.1
FUSIBLE
D114
R180 2.2
R638 56K R637 56K
R636 1K
D136 HALL +B
C191 22/16
+B
SOUND LEVEL METER LED CONTROL
R640 33K
Q106 9014 C SOUND LEVEL METER LED CONTROL
IFR-553PD
D130:IFR-523HD
H
GRAPHIC EQUALIZER PWB-B2 1
2
3
4
Figure 18 SCHEMATIC DIAGRAM (6/6) – 18 –
5
6
