Sharp WQ-740W User manual

WQ-740W/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
WQ-740W
WQ-780W
SERVICE MANUAL
SHARP CORPORATION
No. S7862WQ780W//
• 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.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
WQ-740W
9FF24801830210 AC POWER SUPPLY CORD AND PLUG
9FF24801600292 9FF26802125210
9FF26802125120
WQ-780W
DIFFERENCE BETWEEN
WQ-740W AND WQ-780W
WQ-740W WQ-780W
Auto Reverse None Used
All manuals and user guides at all-guides.com
all-guides.com

WQ-740W/WQ-780W
FITTING OF DIAL POINTER
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
– 2 –
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.
1. Remove the main PWB. Attach the dial pointer as shown
arrow on the front cabinet, putting it into the section
indicated by arrow .
2. Install the main PWB in the front cabinet and secure it with
the four screws.
3.Turnthetuningcontrolknobinthedirectionindicatedby .
Set the dial pointer to point "0", and then make the rest of
the adjustments.
AB
C
Figure 2
Front Cabinet
Dial Pointer (234)
Screw (608)
ø3x10mm
Main PWB
Tuning Control
Knod (233)
Dial Drum (231)
B
A
C
Dial Pointer
(234)
"0" Point
SPECIFICATIONS
Specificationsforthismodelaresubjecttochangewithout
prior notice.
●General
Power source: AC 110-127 V/220-240 V,
50/60 Hz
DC 15 V ["D" size (UM/SUM-
1, R20 or HP-2) battery ×10]
Power consumption: 20 W
Output power: 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.)
Speakers: 12 cm (4-3/4") free-edge
speaker ×2
5 cm (2") surround speaker ×2
Input terminal: MIC 1/2; 1 mV/600 ohms
CD/LINE; 350 mV/47 kohms
Output terminal: Headphones; 16-50 ohms
(recommended; 32 ohms)
Dimensions: Width; 630 mm (24-13/16")
Height; 205 mm (8-1/8")
Depth; 215 mm (8-1/2")
Weight: 5.3 kg (11.7 lbs.) without bat-
teries
●Radio section
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: 60 - 12,000 Hz (Normal tape)
Signal/noise ratio: 40 dB (TAPE 1, recording/playback)
55 dB (TAPE 2, playback)
Wow and flutter: 0.15 % (WRMS)
Motor: DC 15 V electric governor
Bias system: AC bias
Erase system: Magnet erase
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
NAMES OF PARTS
– 3 –
16
25
32
31
30
29
26
27
28
17 18 19 20 2122 23 24
14 15
33
1
789101112
13
65432
34 35 36
37 38 39
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:
18. (TAPE 2) Reverse Mode Switch:
19. (TAPE 2) Play Button:
10. (TAPE 2) Fast Wind Buttons:
11. (TAPE 2) Stop/Eject Button:
12. (TAPE 2) Direction Switch:
13. (TAPE 2) Cassette Compartment
14. Full-Range Speaker
15. Surround Speaker
16. Mixing Microphone Sockets
17. Mixing Microphone Volume
Control
18. Surround On/Off Switch
19. Surround Mode Select Switch
20. Function Selector Switch
21. Surround Mode Indicators
22. Band Selector Switch
23. Tuning Control
24. Fine Tuning Control
25. Sound Level Meter
26. FM Stereo Indicator
27. Power/(TAPE 2) Play Direction
Indicators
28. Built-in Microphone
29. Dubbing Speed/Built-in
Microphone/FM Mode Switch
30. Extra Bass Control: X-BASS
31. Graphic Equalizer Controls
32. Volume Control
33. FM/SW Telescopic Rod Aerial
34. CD/Line Input Sockets
35. Headphone Socket
36. Beat Cancel Switch
37. Battery Compartment
38. AC Power Input Socket
39. AC Voltage Selector
/
1615
24
31
30
29
28
25
26
27
17 18 19 20 21 22 23
13 14
32
1
7891011
12
65432
33 34 35
36 37 38
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:
11. (TAPE 2) Stop/Eject Button:
12. (TAPE 2) Cassette Compartment
13. Full-Range Speaker
14. Surround Speaker
15. Mixing Microphone Sockets
16. Mixing Microphone Volume Control
17. Surround On/Off Switch
18. Surround Mode Select Switch
19. Function Selector Switch
20. Surround Mode Indicators
21. Band Selector Switch
22. Tuning Control
23. Fine Tuning Control
24. Sound Level Meter
25. Power Indicator
26. FM Stereo Indicator
27. Built-in Microphone
28. Dubbing Speed/Built-in
Microphone/FM Mode Switch
29. Extra Bass Control: X-BASS
30. Graphic Equalizer Controls
31. Volume Control
32. FM/SW Telescopic Rod Aerial
33. CD/Line Input Sockets
34. Headphone Socket
35. Beat Cancel Switch
36. Battery Compartment
37. AC Power Input Socket
38. AC Voltage Selector
10.
(TAPE 2) Fast Forward Button:
WQ-740W
WQ-780W
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 4 –
DISASSEMBLY
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
outletbeforestartingtodisassembletheunitandremove
the batteries from the unit.
3. Take off nylon bands or wire holders where they need
to be removed when disassembling the unit. After
servicingtheunit,besureto rearrange the leads where
they were before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
STEP REMOVAL PROCEDURE FIGURE
1 Front Cabinet/ 1. Battery Compartment Lid. 4-1
Rear Cabinet ................................. (A1)x1
2. Screw ................... (A2)x1
3. Screw ................... (A3)x8
4. Socket .................. (A4)x1
2 Tape mechanism 1. Screw ................... (B1)x2 4-2
2. Socket(B2)x3 WQ-740W
2. Socket(B2)x4 WQ-780W
3. Open the cassette holder.
4. Screw ................... (B3)x6
3 Main PWB 1. Knob..................... (C1)x1 4-2
2. Screw ................... (C2)x4
3. Socket .................. (C3)x5
4 Graphic Equalizer 1. Screw ................... (D1)x5 4-3
PWB
5 Volume PWB 1. Knob..................... (E1)x1 4-3
2. Screw ................... (E2)x2
3. Screw ................... (E3)x1
6 Power PWB 1. Screw ................... (F1)x1 4-4
2. Bracket................. (F2)x1
Figure 4-4
Figure 4-2
Figure 4-1
Figure 4-3
(F1)x1
ø3x10mm
Power
Transformer
(F2)x1
Rear Cabinet
Power
PWB
Pull
(A2)x1
ø2.6x10mm
(A3)x8
ø3x20mm
(A1)x1
(A4)x1
Main PWB Front
Cabinet
Rear
Cabinet
Front Cabinet
(D1)x5
ø3x10mm
(E3)x1
ø2x6mm
(E2)x2
ø3x10mm
Graphic
Equalizer PWB
Volume PWB
Lug Wire
(E1)x1
(C2)x4
ø3x10mm
(B1)x1
ø3x20mm
(B3)x6
ø3x10mm
(B1)x1
ø3x20mm
Main
PWB
(B2)x2
(B2)x1
(C3)x1
(C3)x4
Front Cabinet
Casette Holder
(Left/Right)
Open
Open
(C1)x1
Tape Mechanism
(B2)x1
WQ-780W Only
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 5 –
ADJUSTMENT
Figure 5 VCO FREQUENCY TEST CIRCUIT
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
Specified value Instrument Connection
VR201 76 kHz ±200 Hz Pin 13, Pin 21 and ground
of IC202
Specified Value
MECHANISM SECTION
• Driving Force Check
Specified Value
• Torque Check (For WQ-740W)
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
• Head Azimuth
MTT-114 Headphones Socket
(Load resistance: 32 ohms)
Instrument Connection
• Tape Speed (Normal only)
Instrument
Connection
MTT-111 Tape 1,2:VR501 3,000 ±60 Hz Headphones
Socket
(Loadresistance:
32 ohms)
*Openthecassetteholder, andloadthe testtapedirectly into
the mechanism. (Do not load the tape into the cassette
holder.)
Specified Value
Beat Cancel A: 100 ±4 kHz
B: 94 ±4 kHz
C: 104 ±4 kHz
DECK SECTION
• Bias Oscillation
Torque Meter
Torque Meter
Test Tape
Test Tape
• Beat Cancel Switch: A
T301 100 kHz ±4 kHz Pin 1 of CNS108
Adjustment Point Specified value Instrument
Connection
Adjustment
Point
• VCO Frequency
Note:
AfterpreparingthetestcircuitshowninFig.5,connectthePin
13, Pin 21 and ground of the IC202 with the test circuit, and
measure the value.
• FM IF/RF
Specified Value/
Adjusting
Point
Test Stage
IF T201 Input: FM Antenna
Detection T202 Output:Pin 9 of IC202
Band fL: L202 Input: Antenna
Coverage fH: TC202 Output: Headphone Socket
Tracking fL(88.0 MHz): L201 (Load resistance:
fH(108 MHz): TC201 32 ohms)
Instrument
Connection
• AM IF/RF
Test Stage Specified Value/
Adjusting
Point
Instrument
Connection
IF T203
MW Band fL: L203
Coverage fH: TC203
MW Tracking fL(600 kHz): L206
fH(1,400 kHz):TC207
SW1 Band fL(2.3 MHz): L204
Coverage fH(7.3 MHz): TC204
SW1 fL(2.6 MHz): L207
Tracking fH(6 MHz): TC209
SW2 Band fL(7.3 MHz): L205
Coverage fH(22 MHz): TC205
SW2 fL(8.5 MHz): L208
Tracking fH(19 MHz): TC210
Input: Antenna
Output: Pin 9 of IC202
Input: Antenna
Output: Headphone Socket
(Load resistance
32 ohms)
10 pF
1M ohm 10K ohm TO FREQUENCY
COUNTER
Pin 13 of IC202 Pin 21 of IC202
FET: 2SK212
(or Other 2SK Type FET.)
GD
S
0.1 µF
Play: TW-2412 Tape 1: Over 60 g
Tape 2: Over 50 g
Tape 1 Tape 2
Adjustment
Point Specified Value
Specified Value
• Torque Check (For WQ-780W)
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
Torque Meter
Tape 1 Tape 2
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
NOTES ON SCHEMATIC DIAGRAM
• Resistor:
Todifferentiate the units of resistors,The symbol asK and
Mareused:thesymbolKmeans1000ohmandthesymbol
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,theexpression“capacitance/withstand voltage”
is used.
(CH),(RH),(UJ): Temperature compensation
(ML): Mylar type
(S): Styrol type
• Theindicatedvoltage in each sectionis 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
modelaresubject to change for improvement withoutprior
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
SW201 BAND SELECTOR FM
SW301 BEAT CANCEL C
SW302 RECORD/PLAYBACK PLAYBACK
SW401 SURROUND MODE LIVE
SELECT
SW402 SURROUND ON/OFF OFF
SW403 DUBBING SPEED/ HIGH/FM STEREO
BUILT-IN MICROPHONE/
FM MODE
SW404 FUNCTION SELECTOR TAPE
SW501 TAPE 2 MAIN OFF
SW502 TAPE 1 MAIN OFF
SW503 TAPE 2 PLAY OFF
SW504 TAPE 2 DIRECTION A
(WQ-780W Only)
SW505 VOLTAGE SELECTOR AC220-240V
POSITION
– 6 –
Figure 6 ADJUSTMENT POINTS
FM
TRACKING fL
fH
AM IF
FM IF
IC201
IC202
FM
DETECTION
VCO
MW
TRACKING fH
fL
fH
SW1
TRACKING fH
fL
fH
fL
SW2
TRACKING
fL
fH
fL
fH
fL
fH
fL FM BAND
COVERAGE
SW1 BAND
COVERAGE
MW BAND
COVERAGE
SW2 BAND
COVERAGE
MW BAND
COVERAGE
CNS110
BIAS
OSCILLATION
T201
L201
L205
L204
L203
L202
TC
202
TC
201
T203
1
19
2113
T202
TC
207 TC
203
TC209
TC210
L208
MW SW1
L206 L207
TC204
TC205
VR201
CNS108
1
2
3
4
MAIN PWB
T301
All manuals and user guides at all-guides.com
all-guides.com

WQ-740W/WQ-780W
– 7 –
Figure 7 TYPE OF TRANSISTOR AND LED
IFR-523 HD
IFR-553 PD
VIEW
FRONT
2SB1370
2SD2061
8050 C
9014 C
9015 C
9012 G
VIEW
FRONT
E B C
IC201 (LA1186N): FM Front End
PIN
FM
AM
TAPE
1V
0V
0V
1.8V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
5V
0V
0V
1.4V
0V
0V
4V
0V
0V
5V
0V
0V
123456789
IC103 (AN6884): Sound Level Meter
6.13V
6V
6V
6.16V
6V
6V
6V
6V
6V
6V
6V
6V
0V
0V
0V
6V
6V
6V
0V
0V
0V
0V
0V
0V
6.5V
6.5V
6.5V
123456789
IC202 (LA1805): IF Amp, & FM MPX.
PIN
FM
AM
TAPE
1.4V
1.6V
0V
1.4V
1.6V
0V
5.6V
6V
0V
0.6V
0.6V
0V
1.5V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
2.3V
2.4V
0V
2.3V
2.4V
0V
5V
0.5V
0V
1V
1V
0V
123456789101112
PIN
FM
AM
TAPE
1V
1.8V
0V
1V
1.8V
0V
2V
1.8V
0V
1V
1.8V
0V
1.8V
1.8V
0V
1.5V
1.6V
0V
1.6V
0.6V
0V
0.4V
6.6V
0V
5.7V
6.6V
0V
5.7V
1.67V
0V
1.62V
1.67V
0V
1.62V
1.4V
0V
13 14 15 16 17 18 19 20 21 22 23 24
IC301 (TA8189N): Record/Playback Amp.
PIN
RADIO
TAPE PLAY
TAPE REC
0.98V
0.98V
0.98V
0.98V
0.98V
0.98V
2.11V
2.11V
2.11V
1.57V
1.6V
1.6V
5.7V
5.7V
5.7V
4.8V
4.8V
4.8V
0V
0V
0V
0V
0V
0V
2V
2V
2V
1.2V
1.2V
1.2V
0V
0V
0V
0V
0V
0V
123456789101112
PIN
RADIO
TAPE PLAY
TAPE REC
1.4V
1.4V
1.4V
0V
0V
0V
1.29V
1.29V
1.29V
2V
2V
2V
1.4V
1.4V
1.4V
5.8V
5.8V
5.8V
0V
0V
0V
5.7V
5.7V
5.7V
5.3V
5.3V
5.3V
2V
2V
2V
1V
1V
1V
1V
1V
1V
13 14 15 16 17 18 19 20 21 22 23 24
IC402 (LA4558): Power Amp.
14.5V
14.5V
14.5V
0.01V
0.01V
0.01V
1.1V
1.1V
1.1V
7.6V
7.6V
7.6V
0.6V
0.6V
0.6V
13.6V
13.6V
13.6V
0V
0V
0V
15V
15V
15V
13.7V
13.7V
13.7V
0.6V
0.6V
0.6V
12345678910
7.6V
7.6V
7.6V
1.1V
1.1V
1.1V
0.01V
0.01V
0.01V
0V
0V
0V
11 12 13 14
IC401 (BA4558): Ope Amp.
PIN
RADIO
TAPE PLAY
TAPE REC
PIN
RADIO
TAPE PLAY
TAPE REC
PIN
RADIO
TAPE PLAY
TAPE REC
PIN
RADIO
TAPE PLAY
TAPE REC
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
0V
0V
0V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
6.7V
6.7V
6.7V
12345678
Q101
Q102
Q103
Q106
Q107
Q108
Q202
Q203
Q301
Q302
Q303
Q401
Q402
Q501
Q502
Q503
Q504
Q505
Q506
Q507
Q508
Q509
e
0V
0V
7.36V
0V
7.38V
7.98V
0.32V
0.32V
0V
0V
0.5V
0V
0V
7.43V
0V
–1.74V
0V
0V
15.01V
0V
1.93V
0V
b
0.63V
0.63V
6.52V
0.69V
6.54V
7.37V
0.98V
0.98V
0.27V
0V
1.18V
0V
0V
8.06V
0V
0V
0.7V
0V
14.23V
0.74V
2.57V
0V
c
3.27V
3.35V
7.28V
0.1V
7.3V
13.67V
2.88V
2.85V
0.27V
0.4V
5.53V
0V
0V
13.14V
0V
–
0V
0.7V
14.98V
0.12V
3.82V
0V
e
0V
0V
7.36V
0V
7.38V
7.98V
0.32V
0.32V
0V
0V
0.5V
0V
0V
7.43V
15V
0V
0V
15.01V
0V
1.93V
0V
b
0.63V
0.63V
6.52V
0.69V
6.54V
7.37V
0.98V
0.98V
0.27V
0V
1.18V
0V
0V
8.06V
0V
0.70V
0V
14.23V
0.74V
2.57V
0V
c
3.27V
3.35V
7.28V
0V
7.3V
13.67V
2.88V
2.85V
0.27V
0.4V
5.53V
0V
0V
13.14V
8.8V
0V
0.7V
14.98V
0.12V
3.82V
0V
e
0.05V
0.5V
15V
–
0V
0V
1.93V
b
–0.18V
1.18V
0V
0.7V
0.74V
2.57V
c
6.2V
5.53V
8.8V
0.12V
3.82V
RADIO TAPE RECTAPE PLAY
TRANSISTOR
VOLTAGE
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 8 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
A
B
C
D
E
F
G
H
1234 5 6
Figure 8 SCHEMATIC DIAGRAM (1/6)
WQ-740W
LA
GA
BA
RA
RPRP
LB
GB
RB
D202
1N4148
1
IC201
LA1186N
FM FRONT END
2 3 4 5 6
CF201
BAND PASS
FILTER
108MHz
C201
0.001
C202
0.001
7 8 9
L202
C211
0.022
R205
220K
T202
R208
3.9K
C228
1/50
R214
12K
R216
2.2K
R207
820K
C212
0.022
SW201-A
C233
0.022
C520
0.0033(ML)
R354
18K
R327
100K D521
1N4148
R245
100
C258
1/50
R367
18K
1 2 3 4 5 6 7 8 9
10 11 12
131415161718192021222324
IC301
TA8189N
RECORD/PLAYBACK AMP.
C338
47/16
R364
1M
C326
2.2/50
C319
4.7/50
R317
180K
C317
10/16
L361
2.7mH
R361
270
DUBBING CONTROL
R559
100K
C325
47/16
R326
33K
C309
4.7/50 R309
4.7K
R305
56
R307
3.9K
R303
180K
C305
33/16
C307
0.033(ML)
C363
330P
C365
330P
C303
0.001
C528
470P
R322
12K
C321
130P
L304
22mH
C516
150P
PR PR
C301
0.001(ML)
R310
3.9K
R304
180K
C366
330P
C302
0.001(ML)
C306
33/16
R308
150K
C308
0.033(ML)
R325
10K
C304
0.001
R324
10K
R320
180K
C320
4.7/50
C310
4.7/50
R368
18K
R318
2.2K
C318
10/16 R362
270
C316
330P
L302
2.7mH
SW404-D
C521
0.0033(ML)
R355
18K
C261
1/50
R243
100
R247
1K
Q203 9014 C
LINE AMP. C263
1/50
C401
470/16
R563
2.7K
C527
470
Q503
9015 C
TAPE
SPEED
CONTROL
R561
47
R506
3.9K
R412
12K
R404
10K
SW301
BEAT CANCEL
C357
120P C356
430P
R323
10K
SW302-F SW403-B
R403
10K
L206
L207
L208
C244
5P(CH)
TC209
C245
12P(CH)
TC210
SW201-C
SW201-F
VC203
CNH108
CNS108
CNH107 CNS107
R319 2.2K
C361
0.015(ML)
D201
1N4148
R401
100
R560
56K
R405
10K
1
8
3
2 +
–
R406
330
R410
12K
C410
4.7/50
C411
4.7/50
R409
12K
R411
12K
C408
0.0033(ML)
R408
2.7K
C409
0.0033(ML)
R330
100
R413
10K
C415
100/16
C413
1/50
R407
2.7K
5 4 7
6 –
+
SW201-E
R219
100
R246
1K
C262
1/50
R562
2.7K
Q202
9014 C
LINE AMP.
R312
4.7K
C364
330P
C362
0.015(ML)
R306
56
R321
12K
R316
330K
R533
47K
C323
22/16
R328
100
C327
1000/10
R311
150K
C515
130P
L303
22mH
C416
220/16
C412
1/50
VR501
470(B)
SW302-C
SW302-D
SW302-E
SW302-B
C517
150P
C353
0.0056(ML)
Q301
8050 C
BIAS OSC.
R333
27K
C355
0.0015(ML)
C354
0.01(ML)
R332
10 C352
100/16
C351
0.022
SW302-A
R453
2.2K
R454
2.2K
SW201-B
TC207
C243
7P(CH)
R513
10K
TAPE
SPEED
CONTROL
Q504
9014 C
TAPE
TAPE
SPEED
CONTROL
R508
10K
R510
10K
R512
10K
R240
150K
C260
1/50
SW404-C
R241
150K
L203
L204
L205
SW2 OSC.
C235
10P(CH)
TC203
C236
5P(CH)
TC204
C237
5P(CH)
TC205
SW201-G
C238
360P
C239
0.0022
C240
0.0047
R223
47
R222
47
C242
0.022
R220
220
VR202
5K(B)
FINE TUNING
C241
3P(CH)
VC204
AC BIAS CIRCUIT
C210
10/16
R203
22K
C311
0.0082(ML)
C313
4.7/50 R249
18K
R250
18K
C314
4.7/50
R314
22K
C312
0.0082(ML)
C315
330P
R315
330K
R313
22K
MW
SW1
SW2
SW2
FM
MW
SW1
FM
SW2
FM
MW
SW1
SW2
SW1
MW
FM
MW
FM
SW1
SW2
FM
SW2
SW1
MW
R
R
P
P
TAPE
RADIO
TAPE
RADIO
CD/LINE
CD/LINE
FM/SW
ROD ANTENNA
1
2
3
SW201
BAND SELECTOR FM DETECTION
SW201
BAND
SELECTOR
MW
ANTENNA
SW1 ANTENNA
SW2 ANTENNA
MW OSC.
SW1 OSC.
SW201
BAND SELECTOR
SW302
RECORD/PLAYBACK
R532
47K
SW404
FUNCTION SELECTOR
11 22 33
4 4
L-CH
RECORD/PLAYBACK
HEAD
TAPE1
R-CH
+
ERASE
HEAD
1 1
2 2
3 3
J2
CD/LINE GND
R452
47K
R451
47K
ABC
T301
BIAS
OSCILLATION
SW302
RECORD/
PLAYBACK
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
TAPE SPEED
IC401
BA4558
OPE AMP.
(1/2)
(2/2)
IC401
BA4558
OPE AMP.
SW404
FUNCTION
SELECTOR
R336
100
L501
47µH
1
2
3
IC502
KA7809
VOLTAGE
REGULATOR
C511
220/16
C512
0.1
C404
10/16
FM SIGNAL
MW/SW1/SW2 SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
TRACKING fH
fL
MW
L206,L207
MW/SW1 BAR
ANTENNA
TRACKING fL
fHSW2
SW201
BAND SELECTOR
TRACKINGfH
fL SW1 COVERAGE
MW BAND
fH fL
COVERAGE
SW2 BAND
fLfH
L201
C204
0.001
C203
22P(CH)
TC201
VC201
FM RF
FM
TRACKING
fHfL R201
10
C207
3P
C529
0.022
4
CD/
L
R
A
T
A
D527
1N4148
C232
220/16
C256
0.022
0
VR201
10K(B)
R211
15K
VCO
D516
1N4148
C534
4.7/50
R218
100
SW201-D
SW1
SW2
MW
FM
C224
1/50
R210
150K
R212
10
C222
3.3/50
10 11 12
15 14 1318 17 1621 20 1924 23 22
C225
0.012(ML)
C227
1/50
R213
12K
R215
2.2K
C221
3.3/50
C220
470P
C219
0.0082(ML)
R209
12K
C218
0.0047(ML)
9
C226
0.012(ML)
8
7
6
5
CF203
460kHz
1
2
3
AM IF
4
C230
22/16
3
T203
AM IF
C229
0.022
2
C231
0.022
1
IC202
LA1805
IF AMP.& FM MPX.
FM IF
CF202
10.7MHz
1
2
3
R206
47
T201
D203
1N4148
FM IF
fH
fL
R204
100
VC202
R202
33
C208
33P(CH)
TC202
C206
20P(CH)
OSCILLATION
FM
SW201-H
SW2
FM
MW
SW1
R221
47
fH
fL
SW1 BAND
COVERAGE
C214
0.022 C213
10/16
FM BAND
COVERAGE
L-CH
R-CH
MIC/FM
M
NORMAL/FM ST
E
HIGH/FM ST
E
HIGH/FM STEREO
NORMAL/FM STEREO
MIC/FM MONO
L-CH
R-CH
TAPE2
PLAYBACK HEAD
C259
1/50
Q509
9014 C
Q505
9014 C
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 9 –
Figure 9 SCHEMATIC DIAGRAM (2/6)
78 9101112
Q302
9014 C
MUTE
C342
470/16
Q508
9014 C
MIC AMP.
R557
1K
R558
33
C533
4.7/50 R556
150K
C532
500P
C341
4.7/50
R344
4.7K
R343
330
R346
470K
C343
500P
R552
4.7K
R555
4.7K
C345
0.0047(ML) R553
680 R554 680
R534
4.7K
C346
4.7/50
R351
1K
SW402-B
D519
1N4001
VR301
50K(B)
D507
1N4001
R341
10K
R531
1K
Q303
9014 C
MIC AMP.
C344
4.7/50
C414
0.0033(ML)
R416
10K
C417
0.0033(ML)
R415
10K
R349
2.2K
C347
10/16
R350
3.9K
R345
1K
D520
1N4148
SW401-C
R450
4.7K
D517
1N4148
R565
5.6K
C536
47/16
R566
100K
D402
1N4148
ON OFF
LIVE
HALL
MIC
VOLUME
SW401-B
SW402-A
OFF
ON
HALL
LIVE
SW402
SURROUND
ON/OFF
SW402
SURROUND ON/OFF
SW404
FUNCTION
SELECTOR
CNS105 CNS1
SW502
TAPE1 MAIN
SW501
TAPE2 MAIN
SW503
TAPE2 PLAY
–
+
M
M501
TAPE MOTOR
1 1
22
3 3
44
5 5
6 6
7 7
8 8
9 9
1010
R568
1K
C537
10/16
C535
4.7/50
C450
2.2/50(N.P)
C459
2.2/50(N.P)
SW401-A
HALL
LIVE
SW401
SURROUND
MODE SELECT
MIC1
MIC2
MICROPHONES
MIC101
CNS109 CNH109
1 1
2 2 BUILT-IN
MICROPHONE
2
3
4
5
6
7
1
CN207
P12 1-F
FROM GRAPHIC
EQUALIZER PWB
CN4
TWL
GND
GND
L-CH
R-CH
TWR
CNH106
1
2
3
4
5
6
CNS106
1
2
3
4
5
6
SP4
SURROUND
SP2
FULL-RANGE
SP1
FULL-RANGE
SP3
SURROUND
L-CH SPEAKERS
R-CH SPEAKERS
Q510
9014 C
MUTE
R567
22K
R422
120
R423
120
4
6
7
9
8
1
14
12
13 11
10
3
2
5
IC402
LA4508
POWER AMP.
C430
100/16
C428
0.01(ML)
C427
0.01(ML)
C469
220/16
D401
1N4001 C437
470/25
C426
100/16
C425
100/16
C424
0.0015(ML)
C423
0.0015(ML)
C422
1/50
Q402
9014 C
POWER MUTE
Q401
9014 C
POWER MUTE
C421
1/50
R421
10K
R442
10K
R441
10K
R420
10K
F1
C429
100/16
C433
1000/10
C434
1000/10
C432
0.18(ML)
C431
0.18(ML) J1
HEADPHONES
C440 10/16 R440 27K
Q501
8050 C
VOLTAGE
REGULATOR
R501
4.7
D518
1N4148
FUSE
RESISTOR
FUSIBLE
D305
1N4148
D525
1N4148
Q506
2SB1370
SWITCHING
R535
330/1W
R548
100
Q507 9014 C
SWITCHING
R545
22K
R502
680
D522
1N4148
D509
1N4001
C505
10/16
C507
100/16
C508
0.1
R564
22K
D524
1N4148
D505
SW404-B
CD/LINE
RADIO
TAPE
R537
10K
CNS110 CNH110
1
2
C504
0.1
C503
0.1
D504
D503
C501
0.1
C502
0.1
D501
F501
T2A L250V
1
2
T501
POWER
TRANSFORMER
AC220-240V
50/60Hz
AC110-127V
50/60Hz
SO501
AC POWER
INLET SOCKET
AC110-127V/
220-240V
50/60Hz
SW505
VOLTAGE
SELECTOR
D502
C522
3300/25
D523
1N4148
BATTERYS
DC15V['' D '' SIZE(UM/SUM-1,
R20 OR HP-2)BATTERYx10]
CNS102
R419
3.3K
R418
3.3K
CNS101
VCC
GND
LO0
RO0
RI0
LI0
1
2
3
4
5
6
C407
10/16
C473
0.068
C472
0.068
C474
820P
R471
8.2K
R472
8.2K
C471
820P
VR401-B
50K(B) VR401-A
50K(B)
CNH102
VOLUME
FROM GRAPHIC EQUALIZER PWB
CN205
P12 1-C
VOLUME
A
B
MAIN PWB-A
SW401
SURROUND
MODE SELECT
SW401-D
HALL
LIVE
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
SW403-A
R217
330
C529
0.022
D515
1N4148
C530
4.7/50
SW404-A
CD/LINE
RADIO
TAPE SW404
FUNCTION
SELECTOR
D526
1N4148
4
8
6
2
C223
0.0015
M
IC/FM MONO
L
/FM STEREO
H
/FM STEREO
D501~D504'RL202DC
T1.25A
L250V
POWER PWB-C
VOLUME PWB-B1
1
2
3
4
5
2
3
4
5
1 1
5
SW401
SURROUND
MODE SELECT
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 10 –
A
B
C
D
E
F
G
H
1234 5 6
Figure 10 WIRING SIDE OF P.W.BOARD (1/5)
WQ-740W
D115
R611
D113
R615
D114
R614
R613
R612
C147
C148
R167
R169
IC103
R636
R638
D134
1
1234567
7
R137
R112
R111
R116
R118
R122
R117
R123
D131
Q107
Q106
C191
CN207
SOUND LEVEL
METER
R180
Q103
C180
R628
D132 D128
D135
R650
R642
C181
C182
C183
C184
R184
C185
R643 R629
R651
D129
D133
R644
R106
R110
R632
R631
C177
C125
C116
C118
Q101
Q102
C176 R135
C124
C105
VR102 VR101
R645
C105
C108
C110
C107
C111 C114
C109 C112
VR103
VR104
R124
C120
R136
R138
C102
C103
C126
C122
R130
R103
CN205
R101 R102
R104
R191
VR105
R134
R129
C113
R132
R131
R133
R127
C119
C121
R128
R107
R115
R114
R120
R121
R126
R125
R119
R113
R108
R109
C115
C117
C123
C106
R183
D136
R182
R181
R168
C149
R640
D126
D130
R637
R626
D111
D112
CNH102
R472
C472
C474
VR401
C471
C473
E B C
C
B
E
C
B
E
E
B
C
1
2
3
4
5
6
7
8
9
VOLUME PWB-B1
16
A
B
A
B
A
B
A
B
A
B
E C B
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
GRAPHIC EQUALIZER PWB-B2
TAPE 1
TAPE 2
M501
TAPE MOTOR
A B + -
SP2
FULL-RANGE
SP4
SURROUND
L-CH SP1
FULL-RANGE SP3
SURROUND
R-CH
CNH106
WH
RD
BK
BK
RD
WH
TAPE MECHANISM
GND
TAPE MECHANISM
GND
RECORD/PLAYBACK
HEAD(300-2) ERASE HEAD(300-3)
WH
WH WH
BK
BK
BK
BK
RD
RD
RD
CNS1 WH
WH
GR
GR
BL
BL
RD
BK
YL
PK
SW502
TAPE1 MAIN
SW503
TAPE2 PLAY
SW501
TAPE2 MAIN
CNH107
RD
BK
RD
BK
RD
RD
BR
COLOR
TABLE
RD(R) OR YL GR BL VL GY WH(W) BK PK
BROWN RED ORANGE YELLOW GREEN BLUE VIOLET GRAY WHITE BLACK PINK
VOLUME
1
5
R471
1 2 3 4 5 6
3
2
1
6
5
4
3
2
1
VR102~VR105
GRAPHIC EQUALIZER
10KHz 3.3KHz 1KHz 330Hz VR101
X-BASS
PLAYBACK HEAD
(300-4)
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 11 –
Figure 11 WIRING SIDE OF P.W.BOARD (2/5)
78 9101112
R220
C238
C241
C239
C237
C236
TC204
TC205
C242
C240
R223
L205
L204
C235
L202
C207
C201
1
2
3
4
5
6
7
8
9
CF201
1
5
10
12 13
15
20
24
C219
C224
R219 R208
C218
R401
R206
R451
R453
R454
R452
C262
R561
C B E
C B E
E B C
E B C E B C
R506
D509
D525
R423
R421
Q509
R441
R442
R420
C361
R361
R319
R315
R317
R303
D515
C528
D520
R322
R326
R368
R320
R304
R306
C302
C304
CNS107
CNS108
CNH108
L304
C321 C515
C303
C301
R305 R557
R553
R555 R344
C347
R350
R558
R316R318
R362
C362
C527
R321
R323
R403 R405
R422
CNS110
R535
C353
R333
Q506
B C E
F1
T1.25A L 250V
R330
R545
D519
R560
R247
D203
R203
R202
C208
R205
R204
C210
C211
C206 C203
C204
C202
IC201
T201
CF202
C401
R513
R512
Q505 Q504
R508
R241
Q503
Q203
C260
C259
C261
VR501
R510
CNS105
D507
L501
C512
C511
C535
C537
R568
IC502321
R563
R567
R564
CNS102
CNS101
R419
C407
C417
C413
C416
R415
R406
R411
R407
R409
IC401
R404
R410
R408
R412
C412
C404
C414 R416
R418
C410
R413
SW402
VR301
C521
R533
R355
R354
R532
R250
C520
R554
R555
R531
Q302 R341
L302
R314
C312
C327
C325
R327
R367
R249
R440
C440
D521
D524
D523
C338
C314 R325
C318
C316
C320 C310
C533
C341 R534
C344
R552
C343
Q303
R343
SW302
E
B
C
E
B
C
L303
C517
R346
C345
C346
CNS109
R349
R556
Q508
C342
R312
R310
R308
C308
C306
C532
R364
C326
C313
C317
IC301
1
5
10
12
13
20
24
15
C315
L361
R559
D305
D402
C311
R313
R324
C323
R450
C415 C408
C411
C409
SW401
C469
C422
C432 C431
C429
C437
C433
C355
Q501
E
B
C
C508
C505
C507
C530
C319
C309
C305
C307 C516
R311
R307
R309
R336
C363
C365
C364 C366
D505
CN4
R345
R548
D518
D522
R501
R502
C352
C351
C354
Q301
T301
C356
C357
SW301
R332
C522
C430
D401
C427
C424
Q402 Q401
C421
C425
C428
C426
C423
C434
IC402
R562
C459
C450
CNS106
C263 C258
C529
D201
D526
C229
T203
C228
C227
C225
CF203
IC202
C221
R211
R209
TC210
TC209
T202
C244
C245
C213
C231 C230
C214
Q202
R245 R201
R246 R240
R243
L201
R222
L203
R221
SW403
VR202
C233
C243
D202
SW201
SW404
R218
L208
C212
C222
C220
C534 D517
D516
R210
VR201
C223
C256
C232
C226
R214
R216
R213
R215
R217
R212
R207
R566
R328
E
B
C
8
123
65 74
E
B
C
C
B
E
C
B
E
E B C
R351
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Q507
R537
E
B
C
A
B
C
Q510
E B C 1
2
3
4
56
5
4
3
2
1
1 2 3 4 5 6 7 8 9 10
6
5
4
3
2
1
1 2 3 4
1 2 3
MAIN PWB -A
CNH110
FROM
POWER PWB
RD
BK
BK
WH
FM/SW ROD ANTENNA(277)
L206
MW
L207
SW1
MW/SW1
BAR ANTENNA
(281)
CNH109
RD RD
BK BK
MIC101
BUILT-IN
MICROPHONE
2 1
1
2
3
4
5
6
7
J1
HEADPHONE
SW302
RECORD/
PLAYBACK
PALY REC.
1 2 3
1
2
3
3 2 1
D507
TC207
TC201
VC203
VC201
VC204
VC202
TC203
TC202
AB
ED
D
D
F
G
H
C
C
C
B
B
B
B
BCDEFA
A
A
A
A
1
2
C536
TAPE SPEED
L-CH
R-CH
J2
CD/LINE
J2
SW301
BEAT CANCEL
A
B
C
1 2 3 4 1 2
MIC1MIC2
MICROPHONES
VR301
MIC VOLUME
MIN
MAX
SW402
SURROUND
ON/OFF
ON OFF
SW401
SURROUND
MODE SELECT
HALL LIVE
SW404
FUNCTION
SELECTOR
CD/LINE RADIO TAPE
ON STAND-BY
SW201
BAND SELECTOR
SW2 SW1 MW FM
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/FM MODE
HIGH
NORMAL
MIC
FM STEREO FM MONO
FINE TUNING
VCO
P13 6-C
All manuals and user guides at all-guides.com
all-guides.com

WQ-740W/WQ-780W
– 12 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
A
B
C
D
E
F
G
H
1234 5 6
Figure 12 SCHEMATIC DIAGRAM (3/6)
WQ-740W
R191
100
R180
2.2
R181
680
15V
GND
LIVE
STEREO
R135
3.9K
VOLTAGE
REGULATOR
R182
33
R650
330
D135
LIVE
C182
100/16
C181
0.1
C180
100/16
D131
1
6
FUSIBLE
D130:IFR-523HD
+B
HALL
1
7
FM SIGNAL
X-BASS
VR101-A
VR101-B
VR102-A
VR102-B VR103-A
VR103-B VR104-A
VR104-B VR105-A
VR105-B
330Hz 1kHz 3.3kHz 10kHz
GRAPHIC EQUALIZER
C103
470/16
C102
0.1
C106
0.022
R644
68K VR101-A
50K(B)
R106
12K
R110
18K C108
0.01(ML)
R112
8.2K
VR102-A
100K(B)
R114
8.2K R116
5.6K R120
4.7K
C110
0.0068(ML)
R118
4.7K
VR103-A 100K
R122
2.2K
C112
0.0022(ML)
C114
100P
VR104-A
100K(B)
R126
3.3K R128
1.5K R132
820 R134
1K
VR105-A
100K(B)
R130
820
C124
1/50
C118
0.022(ML)
C116
0.022(ML) C120
0.012(ML) C122
0.0068(ML)
R103
560
R101
1K
R104
560
R105
12K
C105
0.022
VR101-B
50K(B)
R645
68K
R109
18K
R113
8.2K
C107
0.01(ML)
R111
8.2K
VR102-B 100K
R115
5.6K
C109
0.0068(ML)
R117
4.7K
VR103-B
100K(B)
R119
4.7K R121
2.2K
C111
0.0022(ML)
VR104-B
100K(B)
R123
3.3K
R125
3.3K R127
1.5K
R129
820
C113
100P
VR105-B
100K(B)
R131 820
R133
1K
(B)
Q101
9014 C
R137
680K
C125
1/50
C177
500P
R107
12K C115
0.022(ML) C123
1/50
C121
0.0068(ML)
C119
0.012(ML)
C117
0.022(ML)
R138
3.9K
C176
500P
R136
680K
Q102 9014 C
C126
1/50
R108
12K
(B)
R102
1K
R628
330
D128
LIVE
R642
330
D132
LIVE
R629
330
D129
HALL
R643
330
D133
HALL
+B
+B
R631
56K
R632
56K
R183
5.6K
R184
47K C185 10/16
C184
10/16
C183
0.1
+B
+B
+B
+B R169
100
C149
1/50
R168
470K C148
10/16
C147
10/16 R167
82K
D115 R615
47
R614
47
D114 D113 D112 D111 R611
47
R612
47
R613
47
1234
5
6
7
8
9
D111~D113:IFR-553PD D114,D115:IFR-523HD
+B
+B
1
2
3
4
6
5
CN205
1
2
3
4
6
5
7
CN207
P9 12-C CNS101
TO MAIN PWB
TO MAIN PWB
CN4 P9 10-G
GRAPHIC
EQUALIZER AMP.
IC103 AN6884
SOUND LEVEL METER
GRAPHIC EQUALIZER PWB-B2
SOUND LEVEL METER
LED CONTROL
R636
1K
SOUND LEVEL METER
LED CONTROL
R638
56K
R640
33K
C191
22/16
R637
56K
POWER
R626
330
D126
POWER
D130
STEREO
R651
330
D136
HALL
D126,D128,D129
D132,D133
D135,D136 IFR-553PD
Q103
2SD2061
Q107
9012 G
Q106
9014 C
GRAPHIC
EQUALIZER
AMP.
D134
1N4148
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 13 –
78 9101112
Figure 13 WIRING SIDE OF P.W.BOARD (3/5)
C503
D503
C502
D502
C501
D501
C504
D504
T2A L 250V
F501
P11 7-C (WQ-740W)
P17 7-C (WQ-780W)
11
22
RD
RD
RD
RD
RD
RD
BK
BK
BK
WH
WH
CNH110
CNS110
TO MAIN PWB
SW505
VOLTAGE
SELECTOR
AC220-240V
AC110-127V
T501
POWER
TRANSFORMER
(280)
(281)
(279)
BATTERYS
DC15V
[ "D" SIZE (UM / SUM-1,
R20 or HP2) battery X10 ]
POWER PWB-C
BL
SO501
AC POWER INLET SOCKET
AC110V-127V
50/60Hz
AC220V-240V
50/60Hz
BR
COLOR TABLE
RD(R)
OR
YL
GR
BL
VL
GY
WH(W)
BK
PK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 14 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
A
B
C
D
E
F
G
H
1234 5 6
Figure 14 SCHEMATIC DIAGRAM (4/6)
WQ-780W
LA
GA
BA
RA
LB
GB
RB
D202
1N4148
1
IC201
LA1186N
FM FRONT END
23456
CF201
BAND PASS
FILTER
108MHz
C201
0.001
C202
0.001
789
L202
C211
0.022
R205
220K
T202
R208
3.9K
C228
1/50
R214
12K
R216
2.2K
R207
820K
C212
0.022
SW201-A
C233
0.022
C520
0.0033(ML)
R354
18K
R327
100K D521
1N4148
R245
100
C258
1/50
R367
18K
14 13
16 15
17
18
19
20
21
22
23
24
1 2 3 4 5 6 7 8 9
10 11 12
IC301
TA8189N
RECORD/PLAYBACK AMP.
C338
47/16
R364
1M
C326
2.2/50
C319
4.7/50
R317
180K
C317
10/16
L361
2.7mH
R361
270
R559
100K
C325
47/16
R326
33K
C309
4.7/50 R309
4.7K
R305
56
R307
3.9K
R303
180K
C305
33/16
C307
0.033(ML)
C363
330P
C365
330P
C303
470P
C528
470P
R322
12K
C321
130P
L304
22mH
C516
150P
PR PR
C301
0.001(ML)
R310
3.9K
R304
180K
C366
330P
C302
0.001(ML)
C306
33/16
R308
150K
C308
0.033(ML)
R325
10K
C304
470P
R324
10K
R320
180K
C320
4.7/50
C310
4.7/50
R368
18K
R318
2.2K
C318
10/16 R362
270
C316
330P
L302
2.7mH
SW404-D
C521
0.0033(ML)
R355
18K
C261
1/50
R243
100
R247
1K
C259
1/50
Q203
9014 C
LINE AMP
C263
1/50
C401
470/16
R563
2.7K
C527
470P
Q503
9015 C
TAPE
SPEED
CONTROL
R561
47
R506
3.9K
R412
12K
R404
10K
SW301
BEAT CANCEL
C357
120P C356
430P
R323
10K
SW302-F
SW403-B
R403
10K
L206
L207
L208
C244
5P(CH)
TC209
C245
12P(CH)
TC210
SW201-C
SW201-F
VC203
CNH108 CNS108
CNH107 CNS107
R319
2.2K
C361
0.015(ML)
D201
1N4148
R401
100
R560
56K
R405
10K
1
8
3
2
+
–
R406
330
R410
12K
C410
4.7/50
C411
4.7/50
R409
12K
C408
0.0033(ML) R408
2.7K
C409
0.0033(ML)
R330
100
R413
10K
C415
100/16
C413
1/50
R407
2.7K
R411
12K
5 4 7
6
–
+
SW201-E
R219
100
R246
1K
C262
1/50
R562
2.7K
Q202
9014 C
LINE AMP
R312
4.7K
C364
330P
C362
0.015(ML)
R306
56
R321
12K
R316
330K
R533
47K
C323
22/16
R328
100
C327
1000/10
R311
150K
C515
130P
L303
22mH
C416
220/16
C412
1/50
VR501
470(B)
SW302-C
SW302-D SW302-E
SW302-B
C517
150P
C353
0.0056(ML)
Q301
8050 C
BIAS OSC.
R333
27K
C355
0.0015(ML)
C354
0.01(ML) R332
10 C352
100/16
C351
0.022
SW302-A
R453
2.2K
R454
2.2K
SW201-B
TC207
C243
7P(CH)
R416
10K
R415
10K
R513
10K
Q505
9014 C
TAPE
SPEED
CONTROL
Q504
9014 C
TAPE
SPEED
CONTROL
R508
10K
R510
10K
R512
10K
R240
150K
C260
1/50
SW404-C
R241
150K
L203
L204
L205
SW2 OSC.
C235
10P(CH)
TC203
C236
5P(CH)
TC204
C237
5P(CH)
TC205
SW201-G
C238
360P
C239
0.0022
C240
0.0047
R223
47
R222
47
C242
0.022
R220
220
VR202
5K(B)
FINE TUNING
C241
3P(CH)
VC204
AC BIAS CIRCUIT
C210
10/16
R203
22K
C311
0.0082(ML)
C313
4.7/50 R249
18K
R250
18K
C314
4.7/50
R314
22K
C312
0.0082(ML)
C315
330P
R315
330K
R313
22K
MW
SW1
SW2
SW2
FM
MW
SW1
FM
SW2
FM
MW
SW1
SW2
SW1
MW
FM
MW
FM
SW1
SW2
FM
SW2
SW1
MW
P R
R
P
PR
TAPE
RADIO
TAPE
RADIO
CD/LINE
CD/LINE
FM/SW
ROD ANTENNA
1
2
3
SW201
BAND SELECTOR FM DETECTION
SW201
BAND SELECTOR
MW
ANTENNA
SW1 ANTENNA
SW2 ANTENNA
MW OSC.
SW1 OSC.
SW201
BAND SELECTOR
SW302
RECORD/PLAYBACK
R532
47K
SW404
FUNCTION SELECTOR
11 22 33
4 4
L-CH
RECORD/PLAYBACK
HEAD
TAPE1
R-CH
+
ERASE
HEAD
SIDE-A
SIDE-B
SIDE-A
SIDE-B
L-CH
R-CH
TAPE2
PLAYBACK HEAD
SW504-A
SW504-B
A
B
A
B 1 1
2 2
3 3
J2
CD/LINE GND
R452
47K
R451
47K
ABC
T301
BIAS
OSCILLATION
FM
MONO
SW302
RECORD/
PLAYBACK
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
TAPE SPEED
IC401
BA4558
OPE AMP.
(1/2)
(2/2)
IC401
BA4558
OPE AMP.
SW404
FUNCTION
SELECTOR
R336
100
L501
47µH
1
2
3
IC502
KA7809
VOLTAGE
REGULATOR
C511
220/16
C512
0.1
C404
10/16
FM SIGNAL
MW/SW1/SW2 SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
TRACKING fH
fL
MW
L206,L207
MW/SW1 BAR
ANTENNA
TRACKING fL
fH
SW2
SW201
BAND SELECTOR
TRACKING
fH
fL SW1 COVERAGE
MW BAND
fH fL
COVERAGE
SW2 BAND
fL
fH
L201
C204
0.001
C203
22P(CH)
TC201
VC201
FM RF
FM
TRACKING
fH
fL R201
10
C207
3P
C529
0.022
CD/
L
R
A
T
A
D527
1N4148
C232
220/16
C256
0.022
0
VR201
10K(B)
R211
15K
VCO
D516
1N4148
C534
4.7/50
R218
100
SW201-D
SW1
SW2
MW
FM
C224
1/50
C225
0.012(ML)
C226
0.012(ML)
13
12
R210
150K
14
11
R212
10
15
C222
3.3/50
10
C227
1/50
R213
12K
R215
2.2K
16
C221
3.3/50
C220
470P
17
18
C219
0.0082(ML)
19
R209
12K
C218
0.0047(ML)
20
21
22
23
24
9
8
7
6
5
CF203
460kHz
1
2
3
AM IF
4
C230
22/16
3
T203
AM IF
C229
0.022
2
C231
0.022
1
IC202
LA1805
IF AMP.& FM MPX.
FM IF
CF202
10.7MHz
1
2
3
R206
47
T201
D203
1N4148
FM IF
fH
fL
R204
100
VC202
R202
33
C208
33P(CH)
TC202
C206
20P(CH)
FM OSCILLATION
SW201-H
SW2
FM
MW
SW1
R221
47
fH
fL
SW1 BAND
COVERAGE
C214
0.022 C213
10/16
FM BAND
COVERAGE
L-CH
R-CH
MIC/FM
M
NORMAL/FM S
T
HIGH/FM ST
HIGH/
FM STEREO
NORMAL/FM STEREO
MIC/
Q509 9014 C
DUBBING CONTROL
P R
SW504
TAPE2
DIRECTION
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 15 –
Figure 15 SCHEMATIC DIAGRAM (5/6)
78 9101112
Q302
9014 C
MUTE
C342
470/16
Q508
9014 C
MIC AMP.
R557
1K
R558
33
C533
4.7/50 R556
150K
C532
500P
C341
4.7/50
R344
4.7K
R343
330
R346
470K
C343
500P
R552
4.7K
R555
4.7K
C345
0.0047(ML) R553
680 R554
680 R534
4.7K
C346
4.7/50
R351
1K
SW402-B
D519
1N4001
VR301
50K(B)
D507
1N4001
R341
10K
R531
1K
6
6
1
2
0
Q303
9014 C
MIC AMP.
C344
4.7/50
C414
0.0033(ML)
R416
10K
C417
0.0033(ML)
R415
10K
R349
2.2K
C347
10/16
R350
3.9K
R345
1K
D520
1N4148
SW401-C
R450
4.7K
D517
1N4148
R565
5.6K
C536
47/16
R566
100K
D402
1N4148
ON OFF
LIVE
HALL
MIC
VOLUME
SW401-B
SW402-A
ON OFF
HALL
LIVE
SW402
SURROUND
ON/OFF
SW402
SURROUND ON/OFF
SW404
FUNCTION
SELECTOR
CNS105 CNS1
SW502
TAPE1 MAIN
SW501
TAPE2 MAIN
H
–
+
M
M501
TAPE MOTOR
1 1
22
3 3
44
5 5
6 6
7 7
8 8
9 9
10 10
R568
1K
C537
10/16
C535
4.7/50
C450
2.2/50(N.P)
C459
2.2/50(N.P)
SW401-A
HALL
LIVE
SW401
SURROUND
MODE SELECT
MIC1
MIC2
MICROPHONES
MIC101
CNS109 CNH109
1 1
2 2
BUILT-IN
MICROPHONE
2
3
4
5
6
7
1
CN207
P18 1-F
1
2 1 2
SW504-C
CN2 CNS2
A
B
SW504
TAPE2 DIRECTION
FROM GRAPHIC
EQUALIZER PWB
CN4
TWL
GND
GND
R-CH
L-CH
TWR
CNH106
1
2
3
4
5
6
CNS106
1
2
3
4
5
6
SP4
SURROUND
SP2
FULL-RANGE
SP1
FULL-RANGE
SP3
SURROUND
L-CH SPEAKERS
R-CH SPEAKERS
Q510
9014 C
MUTE
R567
22K
R422
120
R423
120
4
6
7
9
8
1
14
12
13 11
10
3
2
5
IC402
LA4508
POWER AMP.
C430
100/16
C428
0.01(ML)
C427
0.01(ML)
C469
220/16
D401
1N4001 C437
470/25
C426
100/16
C425
100/16
C424
0.0015(ML)
C423
0.0015(ML)
C422
1/50
Q402
9014 C
POWER MUTE
Q401
9014 C
POWER MUTE
C421
1/50
R421
10K
R442
10K
R441
10K
R420
10K
F1
C429
100/16
C433
1000/10
C434
1000/10
C432
0.18(ML)
C431
0.18(ML) J1
HEADPHONES
C440
10/16
R440
27K
Q501
8050 C
VOLTAGE
REGULATOR
R501
4.7
D518
1N4148
FUSE
RESISTOR
FUSIBLE
D305
1N4148
D525
1N4148
Q506
2SB1370
SWITCHING
R535
330/1W
R548
100
Q507 9014 C
SWITCHING
R545
22K
R502
680
D522
1N4148
D509
1N4001
C505
10/16
C507
100/16
C508
0.1
R564
22K
D524
1N4148
D505
SW404-B
CD/LINE
RADIO
TAPE
R537
10K
CNS110
CNH110
1
2
C504
0.1
C503
0.1
D504D503
C501
0.1
C502
0.1
D501
F501
T2A L250V
1
2
T501
POWER
TRANSFORMER
AC220-240V
50/60Hz
AC110-127V
50/60Hz
SO501
AC POWER
INLET SOCKET
AC110-127V/
220-240V
50/60Hz
SW505
VOLTAGE
SELECTOR
D502
C522
3300/25
D523
1N4148
BATTERYS
DC15V[" D " ISIZE(UM/SUM-1,
R20 OR HP-2)BATTERYx10]
CNS102
R419
3.3K
R418
3.3K
CNS101
VCC
GND
LO0
RO0
RI0
LI0
1
2
3
4
5
6
C407
10/16
C473
0.068
C472
0.068
C474
820P
R471
8.2K
R472
8.2K
C471
820P
VR401-B
50K(B) VR401-A
50K(B)
CNH102
VOLUME
5
1
FROM GRAPHIC EQUALIZER PWB
CN205
P18 1-C
VOLUME
A
B
SW503
TAPE2 PLAY
MAIN PWB-A
SW401
SURROUND
MODE SELECT
SW401-D
HALL
LIVE
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
SW403-A
R217
330
C529
0.022
D515
1N4148
C530
4.7/50
SW404-A
CD/LINE
RADIO
TAPE SW404
FUNCTION
SELECTOR
D526
1N4148
2
7
1
48
C232
220/16
6
2
C223
0.0015
R211
15K
O
MIC/FM MONO
AL/FM STEREO
G
H/FM STEREO
D501~D504'RL202DC
T1.25A
L250V
POWER PWB-C
VOLUME PWB-B1
1
2
3
4
5
2
3
4
5
1
SW401
SURROUND
MODE SELECT
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 16 –
A
B
C
D
E
F
G
H
1234 5 6
Figure 16 WIRING SIDE OF P.W.BOARD (4/5)
WQ-780W
D115
R611
D113
R615
D114
R614
R613
R612
C147
C148
R167
R169
IC103
R636
R638
D134
1
1234567
7
R137
R112
R111
R116
R118
R122
R117
R123
D131
Q107
Q106
C191
CN207
SOUND LEVEL
METER
R627
D127
R180
Q103
C180
R628
D132 D128
D135
R650
R642
C181
C182
C183
C184
R184
C185
R643 R629
R651
D129
D133
R644
R106
R110
R632
R631
C177
C125
C116
C118
Q101
Q102
C176 R135
C124
C105
VR102 VR101
R645
C105
C108
C110
C107
C111 C114
C109 C112
VR103
VR104
R124
C120
R136
R138
C102
C103
C126
C122
R130
R103
CN205
R101 R102
R104
R191
VR105
R134
R129
C113
R132
R131
R133
R127
C119
C121
R128
R107
R115
R114
R120
R121
R126
R125
R119
R113
R108
R109
C115
C117
C123
C106
R183
D136
R182
R181
R168
C149
R640
D126
D130
R637
R626
D111
D112
CNH102
R472
C472
C474
VR401
C471
C473
E B C
C
B
E
C
B
E
E
B
C
1
2
3
4
5
6
7
8
9
VOLUME PWB-B1
16
A
B
A
B
A
B
A
B
A
B
E C B
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
GRAPHIC EQUALIZER PWB-B2
TAPE 1
TAPE 2
M501
TAPE MOTOR
A B + -
SP2
FULL-RANGE
SP4
SURROUND
L-CH SP1
FULL-RANGE SP3
SURROUND
R-CH
CNH106
WH
RD
BK
BK
RD
WH
TAPE MECHANISM
GND
RECORD/PLAYBACK
HEAD(400-4) ERASE HEAD(400-5)
WH
WH
WH
BK
BK BK
BK
BK
RD
RD
RD
CNS1
WH
WH
GR
GR
BL
BL
RD
BK
YL
PK
SW502
TAPE1 MAIN
SW503
TAPE2 PLAY
SW501
TAPE2 MAIN
PLAYBACK
HEAD (400-6)
CNS2
GY
CNH107
RD
BK
RD
BK
RD
RD
AB
SW504
TAPE2
DIRECTION
BR
COLOR
TABLE
RD(R) OR YL GR BL VL GY WH(W) BK PK
BROWN RED ORANGE YELLOW GREEN BLUE VIOLET GRAY WHITE BLACK PINK
VOLUME
51
R471
1 2 3 4 5 6
2
1
HEAD
FLEXIBLE PWB
3
2
1
6
5
4
3
2
1
VR102~VR105
GRAPHIC EQUALIZER
10KHz 3.3KHz 1KHz 330Hz VR101
X-BASS
All manuals and user guides at all-guides.com
all-guides.com

WQ-740W/WQ-780W
– 17 –
Figure 17 WIRING SIDE OF P.W.BOARD (5/5)
78 9101112
R220
C238
C241
C239
C237
C236
TC204
TC205
C242
C240
R223
L205
L204
C235
L202
C207
C201
1
2
3
4
5
6
7
8
9
CF201
1
5
10
12 13
15
20
24
C219
C224
R219 R208
C218
R401
R206
R451
R453
R454
R452
C262
R561
C B E
C B E
E B C
E B C E B C
R506
D509
D525
R423
R421
Q509
R441
R442
R420
C361
R361
R319
R315
R317
R303
D515
C528
D520
R322
R326
R368
R320
R304
R306
C302
C304
CNS107
CNS108
CNH108
L304
C321 C515
C303
C301
R305 R557
R553
R555 R344
C347
R350
R558
R316R318
R362
C362
C527
R321
R323
R403 R405
R422
CNS110
R535
C353
R333
Q506
B C E
F1
T1.25A L 250V
R330
R545
D519
R560
R247
D203
R203
R202
C208
R205
R204
C210
C211
C206 C203
C204
C202
IC201
T201
CF202
C401
R513
R512
Q505 Q504
R508
R241
Q503
Q203
C260
C259
C261
VR501
R510
CNS105
D507
L501
C512
C511
C535
C537
R568
IC502321
R563
R567
R564
CNS102
CNS101
R419
C407
C417
C413
C416
R415
R406
R411
R407
R409
IC401
R404
R410
R408
R412
C412
C404
C414 R416
R418
C410
R413
SW402
VR301
C521
R533
R355
R354
R532
R250
C520
R554
R555
R531
Q302 R341
L302
R314
C312
C327
C325
R327
R367
R249
R440
C440
D521
D524
D523
C338
C314 R325
C318
C316
C320 C310
C533
C341 R534
C344
R552
C343
Q303
R343
SW302
E
B
C
E
B
C
L303
C517
R346
C345
C346
CNS109
R349
R556
Q508
C342
R312
R310
R308
C308
C306
C532
R364
C326
C313
C317
IC301
1
5
10
12
13
20
24
15
C315
L361
R559
D305
D402
C311
R313
R324
C323
R450
C415 C408
C411
C409
SW401
C469
C422
C432 C431
C429
C437
C433
C355
Q501
E
B
C
C508
C505
C507
C530
C319
C309
C305
C307 C516
R311
R307
R309
R336
C363
C365
C364 C366
D505
CN4
R345 CN2
R548
D518
D522
R501
R502
C352
C351
C354
Q301
T301
C356
C357
SW301
R332
C522
C430
D401
C427
C424
Q402 Q401
C421
C425
C428
C426
C423
C434
IC402
R562
C459
C450
CNS106
C263 C258
C529
D201
D526
C229
T203
C228
C227
C225
CF203
IC202
C221
R211
R209
TC210
TC209
T202
C244
C245
C213
C231 C230
C214
Q202
R245 R201
R246 R240
R243
L201
R222
L203
R221
SW403
VR202
C233
C243
D202
SW201
SW404
R218
L208
C212
C222
C220
C534 D517
D516
R210
VR201
C223
C256
C232
C226
R214
R216
R213
R215
R217
R212
R207
R566
R328
E
B
C
8
123
65 74
E
B
C
C
B
E
C
B
E
E B C
R351
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Q507
R537
E
B
C
A
B
C
1
2
Q510
E B C 1
2
3
4
56
5
4
3
2
1
1 2 3 4 5 6 7 8 9 10
6
5
4
3
2
1
1 2 3 4
1 2 3
MAIN PWB -A
CNH110
FROM
POWER PWB
RD
BK
BK
WH
FM/SW ROD ANTENNA(277)
L206
MW
L207
SW1
MW/SW1
BAR ANTENNA
(281)
CNH109
RD RD
BK BK
MIC101
BUILT-IN
MICROPHONE
2 1
1
2
3
4
5
6
7
J1
HEADPHONE
SW302
RECORD/
PLAYBACK
PALY REC.
1 2 3
1
2
3
3 2 1
D507
TC207
TC201
VC203
VC201
VC204
VC202
TC203
TC202
AB
ED
D
D
F
G
H
C
C
C
B
B
B
B
BCDEFA
A
A
A
A
1
2
C536
TAPE SPEED
L-CH
R-CH
J2
CD/LINE
J2
SW301
BEAT CANCEL
A
B
C
1 2 3 4 1 2
MIC1MIC2
MICROPHONES
VR301
MIC VOLUME
MIN
MAX
SW402
SURROUND
ON/OFF
ON OFF
SW401
SURROUND
MODE SELECT
HALL LIVE
SW404
FUNCTION
SELECTOR
CD/LINE RADIO TAPE
ON STAND-BY
SW201
BAND SELECTOR
SW2 SW1 MW FM
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/FM MODE
HIGH
NORMAL
MIC
FM STEREO FM MONO
FINE TUNING
VCO
P13 6-C
All manuals and user guides at all-guides.com

WQ-740W/WQ-780W
– 18 –
A
B
C
D
E
F
G
H
1234 5 6
Figure 18 SCHEMATIC DIAGRAM (6/6)
WQ-780W
R191
100
R180
2.2
R181
680
15V
GND
LIVE
A-SIDE
B-SIDE
STEREO
R135
3.9K
Q101
9014 C
VOLTAGE
REGULATOR
R182
33
R650
330
D135
LIVE
C182
100/16
C181
0.1
C180
100/16
D131
1
6
FUSIBLE
D126~D129
D132,D133
D135,D136
D130:IFR-523HD
IFR-553PD
+B
HALL
1
7
FM SIGNAL
X-BASS
VR101-A
VR101B
VR102-A
VR102-B VR103-A
VR103-B VR104-A VR104-B VR105-A VR105-B
330Hz 1kHz 3.3kHz 10kHz
GRAPHIC EQUALIZER
C103
470/16
C102
0.1
C106
0.022
R644
68K
VR101-A
50K(B)
R106
12K
R110
18K C108
0.01(ML)
R112
8.2K
VR102-A
100K(B)
R114
8.2K R116
5.6K R120
4.7K
C110
0.0068(ML)
R118
4.7K
VR103-A 100K
R122
2.2K
C112
0.0022(ML)
R124
3.3K
VR104-A
100K(B)
R126
3.3K R128
1.5K R132
820
C114
100P
R134
1K
VR105-A
100K(B)
R130
820
C124
1/50
C118
0.022(ML) C120
0.012(ML) C122 0.0068(ML)
R101
1K
R103
560
R104
560
R105
12K
C105
0.022
VR101-B
50K(B)
R645
68K
R109
18K
R113
8.2K
C107
0.01
R111
8.2K
VR102-B
100K(B)
R115
5.6K
C109
0.0068(ML)
R117
4.7K
VR103-B
100K(B)
R119
4.7K R121
2.2K
C111
0.0022(ML)
VR104-B 100K
R123
3.3K
R125
3.3K R127 1.5K
R129
820
C113
100P
VR105-B
100K(B)
R131
820 R133
1K
(ML)
(B)
R137
680K
C125
1/50
C177
500P
R107
12K C115
0.022(ML) C123
1/50
C117
0.022(ML) C119 0.012(ML) C121
0.0068(ML)
R138
3.9K
C176
500P
R136
680K
Q102
9014 C
C126
1/50
R108
12K C116
0.022(ML)
(B)
R102
1K
R628
330
D128
LIVE
R642
330
D132
LIVE
R629
330
D129
HALL
R643
330
D133
HALL
R627
330
D127
A-SIDE
R626
330
D126
B-SIDE
D130
STEREO
R651
330
D136
HALL
+B
+B
R631
56K
R632
56K
R183
5.6K
R184
47K C185
10/16
C184
10/16
C183
0.1
+B
+B
+B
D134
1N4148
+BR169
100
C149
1/50
R168
470K C148
10/16
C147
10/16 R167
82K
D115 R615
47
R614
47
D114 D113
D112 D111 R611
47
R612
47
R613
47
1234
5
6
7
8
9
D111~D113'IFR-553PD D114,D115'IFR-523HD
+B
+B
1
2
3
4
6
5
CN205
1
2
3
4
6
5
7
CN207
P15 12-C CNS101
TO MAIN PWB
TO MAIN PWB
CN4 P15 10-G
GRAPHIC EQUALIZER PWB-B2
Q107
9012 G
R636
1K
SOUND LEVEL METER
LED CONTROL
R638
56K
R640
33K
C191
22/16
R637
56K
IC103 AN6884
SOUND LEVEL METER
GRAPHIC
EQUALIZER
AMP.
GRAPHIC
EQUALIZER
AMP.
SOUND LEVEL METER
LED CONTROL
Q106
9014 C
Q103
2SD2061
All manuals and user guides at all-guides.com

All manuals and user guides at all-guides.com

All manuals and user guides at all-guides.com