WQ-740W/WQ-780W
SERVICE MANUAL
No. S7862WQ780W//
WQ-740W
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.
WQ-780W
DIFFERENCE BETWEEN
WQ-740W AND WQ-780W
WQ-740W WQ-780W
Auto Reverse None Used
WQ-780W
CONTENTS
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
Page
AC POWER SUPPLY CORD AND PLUG
9FF24801830210
9FF24801600292 9FF26802125210
SHARP CORPORATION
9FF26802125120
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
● General
Power source: AC 110-127 V/220-240 V,
50/60 Hz
DC 15 V ["D" size (UM/SUM1, 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
VOLTAGE SELECTION
● 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
Specifications for this model are subject to change without
prior notice.
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
A
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. Turn the tuning control knob in the direction indicated by .
Set the dial pointer to point "0", and then make the rest of
the adjustments.
B
C
Dial Pointer (234)
C
B
Dial Drum (231)
Front Cabinet
A
Tuning Control
Knod (233)
Dial Pointer
(234)
"0" Point
Main PWB
Screw (608)
ø3x10mm
– 2 –
Figure 2
WQ-740W
WQ-740W/WQ-780W
NAMES OF PARTS
24
25
26
27
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:
(TAPE 2) Fast Forward Button:
10.
11.
(TAPE 2) Stop/Eject Button:
12.
(TAPE 2) Cassette Compartment
13.
Full-Range Speaker
1615
17 18 19 20 21 22 23
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
1
13 14
28
29
30
31
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
7891011
65432
32
33 34 35
36 37 38
12
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
WQ-780W
25
26
27
28
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:
/
16
17 18 19 20 2122 23 24
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
14 15
29
30
31
32
– 3 –
1
789101112
65432
33
34 35 36
37 38 39
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
13
WQ-740W/WQ-780W
Front Cabinet
(D1)x5
ø3x10mm
(E3)x1
ø2x6mm
(E2)x2
ø3x10mm
Graphic
Equalizer PWB
Volume PWB
Lug Wire
(E1)x1
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
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 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
(B1)x1
ø3x20mm
Front Cabinet
(C3)x1
(C2)x4
ø3x10mm
(B2)x1
Main
PWB
Open
Casette Holder
(Left/Right)
(B3)x6
ø3x10mm
(C3)x4
(B2)x2
(B2)x1
WQ-780W Only
Figure 4-2
Open
(B1)x1
ø3x20mm
Tape Mechanism
(C1)x1
(A2)x1
ø2.6x10mm
(A1)x1
(A3)x8
ø3x20mm
Figure 4-1
(A4)x1
Main PWB
Rear
Cabinet
Front
Cabinet
Figure 4-3
Rear Cabinet
(F2)x1
Power
PWB
Pull
(F1)x1
ø3x10mm
Power
Transformer
Figure 4-4
– 4 –
ADJUSTMENT
WQ-740W/WQ-780W
MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2412 Tape 1: Over 60 g
Specified Value
Tape 2: Over 50 g
• Torque Check (For WQ-740W)
Torque Meter
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
Specified Value
Tape 1 Tape 2
• Torque Check (For WQ-780W)
Torque Meter
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
Specified Value
Tape 1 Tape 2
• Head Azimuth
Test Tape
MTT-114 Headphones Socket
Instrument Connection
(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)
Test Tape
MTT-111 Tape 1,2:VR501 3,000 ± 60 Hz Headphones
Adjustment
Point
Specified
Value
Instrument
Connection
Socket
(Loadresistance:
32 ohms)
DECK SECTION
• Bias Oscillation
• Beat Cancel Switch: A
Adjustment Point Specified value Instrument
T301 100 kHz ± 4 kHz Pin 1 of CNS108
Connection
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
• FM IF/RF
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:
Specified Value/
Adjusting
Point
fH(108 MHz): TC201 32 ohms)
• AM IF/RF
Test Stage
IF T203
MW Band fL: L203
Coverage fH: TC203
MW Tracking fL(600 kHz): L206
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
Specified Value/
Adjusting
Point
fH(1,400 kHz):TC207
• VCO Frequency
Adjustment
Point
VR201 76 kHz ± 200 Hz Pin 13, Pin 21 and ground
Specified value Instrument Connection
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.
Instrument
Connection
Instrument
Connection
Input: Antenna
Output: Pin 9 of IC202
Input: Antenna
Output: Headphone Socket
(Load resistance
32 ohms)
of IC202
Specified Value
Beat Cancel A: 100 ± 4 kHz
B: 94 ± 4 kHz
C: 104 ± 4 kHz
Pin 13 of IC202
– 5 –
Pin 21 of IC202
D
G
10 pF
1M ohm
10K ohm
FET: 2SK212
(or Other 2SK Type FET.)
S
0.1 µF
TO FREQUENCY
COUNTER
Figure 5 VCO FREQUENCY TEST CIRCUIT
WQ-740W/WQ-780W
CNS110
T301
BIAS
OSCILLATION
CNS108
1
2
3
4
SW2
TRACKING
FM
TRACKING
FM
DETECTION
fH
fL
VCO
AM IF
VR201
TC210
L208
fH
T203
IC202
2113
fL
19
T202
TC209
FM IF
T201
IC201
L201
TC
201
TC
207
1
L202
TC
202
TC
203
L203
TC204
TC205
L205
L204
fH
FM BAND
COVERAGE
fL
fH
SW1 BAND
COVERAGE
fL
MW BAND
fL
COVERAGE
fL
SW2 BAND
COVERAGE
fH
MW BAND
fH
COVERAGE
MW
TRACKING
SW1
TRACKING
fH
fL
MW
L206
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.
fH
fL
MAIN PWB
SW1
L207
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 –
IFR-523 HD
IFR-553 PD
VIEW
FRONT
2SB1370
2SD2061
8050 C
9014 C
9015 C
9012 G
VIEW
FRONT
E B C
VOL TAGE
WQ-740W/WQ-780W
IC103 (AN6884): Sound Level Meter
PIN
RADIO
TAPE PLAY
TAPE REC
123456789
6.13V
6.16V
6V
6V
0V
6V
6V
6V
6V
6V
0V
6V
6V
6V
6V
6V
0V
6V
IC201 (LA1186N): FM Front End
PIN
FM
AM
TAPE
123456789
1V
1.8V
0V
0V
0V
5V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
IC202 (LA1805): IF Amp, & FM MPX.
PIN
FM
AM
TAPE
123456789101112
1.4V
1.4V
5.6V
0.6V
1.5V
0V
1.6V
1.6V
6V
0.6V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
1.4V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
4V
0V
0V
6.5V
6.5V
6.5V
5V
0V
0V
2.3V
2.4V
0V
2.3V
2.4V
0V
TRANSISTOR
Q101
Q102
Q103
Q106
Q107
Q108
Q202
Q203
Q301
Q302
Q303
Q401
Q402
Q501
Q502
Q503
Q504
Q505
Q506
Q507
Q508
Q509
5V
1V
0.5V
1V
0V
0V
RADIO TAPE RECTAPE PLAY
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
7.36V
7.38V
7.98V
0.32V
0.32V
0.5V
7.43V
15V
15.01V
1.93V
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
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
e
b
c
e
b
c
0.63V
3.27V
0.63V
3.35V
6.52V
7.28V
0.69V
0V
6.54V
7.3V
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
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
0.05V
0.5V
15V
–
0V
0V
1.93V
–0.18V
1.18V
0V
0.7V
0.74V
2.57V
6.2V
5.53V
8.8V
0.12V
3.82V
PIN
FM
AM
TAPE
13 14 15 16 17 18 19 20 21 22 23 24
1V
1V
2V
1V
1.8V
1.5V
1.6V
1.8V
1.8V
1.8V
1.8V
1.8V
1.6V
0.6V
0V
0V
0V
0V
0V
0V
0V
IC301 (TA8189N): Record/Playback Amp.
PIN
RADIO
TAPE PLAY
TAPE REC
PIN
RADIO
TAPE PLAY
TAPE REC
123456789101112
0.98V
0.98V
2.11V
1.57V
5.7V
4.8V
0V
0.98V
0.98V
2.11V
1.6V
5.7V
4.8V
0V
0.98V
0.98V
2.11V
1.6V
5.7V
4.8V
0V
13 14 15 16 17 18 19 20 21 22 23 24
1.4V
0V
1.29V
2V
1.4V
5.8V
0V
1.4V
0V
1.29V
2V
1.4V
5.8V
0V
1.4V
0V
1.29V
2V
1.4V
5.8V
0V
IC401 (BA4558): Ope Amp.
PIN
RADIO
TAPE PLAY
TAPE REC
12345678
3.3V
3.3V
3.3V
0V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
0V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
0V
3.3V
3.3V
3.3V
IC402 (LA4558): Power Amp.
PIN
RADIO
TAPE PLAY
TAPE REC
12345678910
14.5V
0.01V
1.1V
7.6V
0.6V
13.6V
0V
14.5V
0.01V
1.1V
7.6V
0.6V
13.6V
0V
14.5V
0.01V
1.1V
7.6V
0.6V
13.6V
0V
0.4V
6.6V
0V
0V
0V
0V
5.7V
5.7V
5.7V
6.7V
6.7V
6.7V
15V
15V
15V
5.7V
6.6V
0V
2V
2V
2V
5.3V
5.3V
5.3V
13.7V
13.7V
13.7V
5.7V
1.67V
0V
1.2V
1.2V
1.2V
2V
2V
2V
0.6V
0.6V
0.6V
1.62V
1.67V
0V
0V
0V
0V
1V
1V
1V
1.62V
1.4V
0V
0V
0V
0V
1V
1V
1V
PIN
RADIO
TAPE PLAY
TAPE REC
7.6V
7.6V
7.6V
11 12 13 14
1.1V
0.01V
1.1V
0.01V
1.1V
0.01V
0V
0V
0V
Figure 7 TYPE OF TRANSISTOR AND LED
– 7 –
WQ-740W/WQ-780W
4
L
A
A
0
M
E
E
WQ-740W
FM/SW
A
B
C
RECORD/PLAYBACK
D
L-CH
R-CH
+
ERASE
HEAD
E
PLAYBACK HEAD
L-CH
F
R-CH
J2
G
CD/LINE
H
ROD ANTENNA
TAPE1
HEAD
TAPE2
L-CH
GND
R-CH
CNH108
4 4
CNH107
1 1
2 2
3 3
CNS108
1 1
2 2
3 3
CNS107
R452
47K
R451
47K
SW201
BAND SELECTOR
SW201-B
D202
1N4148
MW
TRACKING
SW201-F
FM
MW
SW1
SW2
VC203
SW201
BAND
SELECTOR
SW201-C
FM
MW
SW1
SW2
TC210
fHSW2
TRACKING
fL
SW302
RECORD/PLAYBACK
SW302-B
PR PR
LA
GA
BA
RA
SW302-E
RPRP
LB
GB
RB
C515
130P
L303
C517
22mH
150P
BEAT CANCEL
ABC
R454
2.2K
R453
2.2K
C357
120P
FM SIGNAL
MW/SW1/SW2 SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
FM
MW
SW1
SW2
fL
fH
C516
150P
SW302-C
SW302-D
SW301
C356
430P
1 2 3
FM RF
L201
FM
TRACKING
TC209
L206,L207
MW/SW1 BAR
ANTENNA
C245
12P(CH)
C301
C527
470
R321
12K
C355
1
C201
0.001
CF201
BAND PASS
FILTER
108MHz
C203
22P(CH)
C204
fHfL
0.001
TC207
C243
7P(CH)
C244
5P(CH)
SW1 ANTENNA
C321
130P
L304
22mH
0.001(ML)
C303
0.001
1 2 3 4
C302
0.001(ML)
C304
0.001
AC BIAS CIRCUIT
0.0015(ML)
T301
BIAS
OSCILLATION
IC201
LA1186N
FM FRONT END
2 3 4
C202
0.001
TC201
R201
10
L206
MW
ANTENNA
L207
L208
SW2 ANTENNA
R322
12K
C528
470P
R305
56
C307
0.033(ML)
R311
150K
C305
33/16
C365
330P
C363
330P
C364
330P
C366
330P
C306
33/16
R306
56
0.0056(ML)
0.01(ML)
6
5
FM
OSCILLATION
L202
VC201
R203
C211
0.022
BAND SELECTOR
FM
MW
SW1
SW2
C241
3P(CH)
R220
220
VR202
5K(B)
FINE TUNING
R326
33K
3.9K
R307
4.7K
R309
C309
4.7/50
R303
180K
IC301
TA8189N
RECORD/PLAYBACK AMP.
6
5
3.9K
R310
C310
4.7/50
R304
180K
C308
0.033(ML)
150K
R308
R333
27K
C353
R332
10
C354
8
9
7
C207
3P
C208
R202
C206
20P(CH)
33
TC202
VC202
22K
C210
10/16
SW201
R219
100
SW201-E
fL
SW1
TRACKINGfH
SW201-G
FM
MW
SW1
SW2
VC204
SW2 BAND
COVERAGE
DUBBING CONTROL
R559
100K
Q509
9014 C
C325
47/16
C327
1000/10
C326
R317
2.2/50
180K
8
9
7
R320
C320
4.7/50
C318
10/16
4.7K
R312
R368
10K
R324
C323
22/16
10K
R325
Q301
8050 C
BIAS OSC.
C352
100/16
C351
0.022
33P(CH)
1N4148
C238
360P
TC203
C239
0.0022
TC204
C240
0.0047
TC205
R328
C319
4.7/50
10
180K
18K
SW302-A
R330
100
R205
220K
D203
R204
100
fLfH
100
SW302-F
C212
0.022
fL
FM BAND
COVERAGE
fH
T201
FM IF
MW BAND
COVERAGE
fH fL
C235
10P(CH)
C236
5P(CH)
C237
5P(CH)
L361
2.7mH
R319
2.2K
C361
0.015(ML)
R361
270
C317
10/16
131415161718192021222324
11
12
C316
330P
R362
270
L302
2.7mH
R318
2.2K
C362
0.015(ML)
DUBBING SPEED/
R323
BUILT-IN MICROPHONE/
10K
SW403-B
P
R
P
SW302
RECORD/
PLAYBACK
R
R207
820K
FM DETECTION
C214
0.022
R206
47
L203
MW OSC.
L204
SW1 OSC.
L205
SW2 OSC.
R327
100K
0.0033(ML)
C311
0.0082(ML)
R367
18K
R313
R315
330K
C313
4.7/50
C315
330P
C338
47/16
R364
1M
C314
4.7/50
R314
22K
330K
R316
C312
0.0033(ML)
SW403
FM MODE
HIGH/FM STEREO
NORMAL/FM STEREO
MIC/FM MONO
R513
10K
R336
100
T202
FM IF
CF202
10.7MHz
1 2 3
R222
47
fL
SW1 BAND
COVERAGE
fH
R223
C242
0.022
C520
22K
SW404-C
SW404
FUNCTION
SELECTOR
C259
1/50
C261
1/50
18K
R250
TAPE
CD/LINE
RADIO
0.0082(ML)
C521
R510
10K
R512
10K
Q505
9014 C
TAPE
SPEED
CONTROL
C213
10/16
R208
3.9K
2
1
C231
0.022
C229
0.022
R221
47
SW201-H
BAND SELECTOR
FM
MW
SW1
TAPE
C260
1/50
1/50
Q203 9014 C
LINE AMP.
R241
150K
VR501
470(B)
SW2
CD/LINE
RADIO
Q202
9014 C
LINE AMP.
SW404
R355
18K
CONTROL
MW
SW1
SW2
R240
150K
R245
100
R247
1K
TAPE SPEED
R561
Q503
9015 C
TAPE
SPEED
CONTROL
R508
10K
Q504
9014 C
TAPE
TAPE
SPEED
FM
47
R532
47K
R249
18K
C258
SW404-D
FUNCTION SELECTOR
R533
47K
C218
0.0047(ML)
R209
12K
IC202
LA1805
IF AMP.& FM MPX.
4
3
6
5
C230
22/16
T203
3
1
AM IF
2
CF203
460kHz
AM IF
C228
SW201
1/50
R214
SW201-A
12K
C233
0.022
D521
1N4148
R401
47
R506
3.9K
R354
18K
R246
R243
100
100
1K
C262
1/50
C401
470/16
C263
1/50
R560
56K
R562
2.7K
R216
R563
C219
7
2.2K
D201
2.7K
R403
10K
C220
470P
0.0082(ML)
C221
3.3/50
8
9
C226
C227
1/50
R215
2.2K
1N4148
OPE AMP.
10K
R404
R407
2.7K
OPE AMP.
C512
0.1
C222
3.3/50
15 14 1318 17 1621 20 1924 23 22
10 11 12
C225
0.012(ML)
0.012(ML)
R213
12K
IC401
BA4558
R408
2.7K
C408
0.0033(ML)
C409
0.0033(ML)
IC401
BA4558
C404
10/16
REGULATOR
C511
220/16
C224
1/50
R212
10
SW201-D
FM
MW
SW1
SW2
R218
C534
4.7/50
D516
1N4148
R406
330
8
3
+
(1/2)
2
–
R412
12K
R410
R405
12K
10K
C410
4.7/50
C411
4.7/50
R413
10K
R409
12K
R411
12K
6
–
(2/2)
+
5
4
IC502
KA7809
VOLTAGE
1
2
R210
150K
100
1
C416
220/16
3
7
MIC/FM
NORMAL/FM ST
HIGH/FM ST
R211
15K
VR201
10K(B)
VCO
C232
220/16
C256
0.022
D527
1N4148
C412
1/50
C415
100/16
C413
1/50
L501
47µH
C529
0.022
CD/
R
T
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
1
2
34 5
Figure 8 SCHEMATIC DIAGRAM (1/6)
– 8 –
6
WQ-740W/WQ-780W
6
2
L
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
IC/FM MONO
/FM STEREO
/FM STEREO
C529
0.022
8
0.0015
CD/LINE
RADIO
TAPE
C223
C530
4.7/50
R416
R415
C407
10/16
R217
10K
SW403-A
330
D526
1N4148
SW404-A
SW404
FUNCTION
SELECTOR
D515
1N4148
10K
C414
0.0033(ML)
C417
0.0033(ML)
D520
R345
1N4148
1K
R341
10K
Q302
9014 C
MUTE
R531
1K
C347
10/16
HALL
2
3
14
12
13 11
D401
1N4001
SWITCHING
Q507 9014 C
CNS110
1
2
CNS102
5
4
3
2
1
1
2
3
4
5
6
1 1
3 3
5 5
6 6
7 7
8 8
9 9
R552
4.7K
R555
4.7K
R553
680
R349
2.2K
LIVE
5
1
220/16
C459
2.2/50(N.P)
IC402
LA4508
C469
10
8
SW401
SURROUND
MODE SELECT
SW401-A
LIVE
C428
0.01(ML)
4
6
C430
100/16
7
C429
100/16
9
POWER AMP.
C437
470/25
POWER PWB-C
C504
0.1
CNH110
1
2
0.1
C503
5
5
4
3
2
1
1
CNH102
FROM GRAPHIC EQUALIZER PWB
CN205
P12 1-C
SW502
TAPE1 MAIN
2 2
SW501
TAPE2 MAIN
4 4
SW503
TAPE2 PLAY
+
–
B
M
TAPE MOTOR
A
1010
CNS1
R554
680
HALL
C427
0.01(ML)
C502
0.1
D504
C501
0.1
D503
D501~D504'RL202DC
C471
820P
M501
C346
4.7/50
C434
1000/10
C432
0.18(ML)
C431
0.18(ML)
C433
1000/10
VR401-B
50K(B)
VOLUME
F501
T2A L250V
D501
D502
R471
8.2K
R534
4.7K
C450
2.2/50(N.P)
TRANSFORMER
BATTERYS
DC15V['' D '' SIZE(UM/SUM-1,
R20 OR HP-2)BATTERYx10]
C473
R472
0.068
8.2K
C472
0.068
CNS109 CNH109
TWL
L-CH
GND
GND
R-CH
TWR
R422
120
R423
120
T501
POWER
AC220-240V
50/60Hz
AC110-127V
50/60Hz
C474
820P
VR401-A
50K(B)
VOLUME
VOLUME PWB-B1
1 1
2 2
1
2
3
4
5
6
7
CN4
CNS106
1
2
3
4
5
6
MIC2
MIC1
EQUALIZER PWB
CNH106
1
2
3
4
5
6
HEADPHONES
SW505
VOLTAGE
SELECTOR
MICROPHONES
MIC101
BUILT-IN
MICROPHONE
FROM GRAPHIC
CN207
P12 1-F
J1
INLET SOCKET
SP4
SURROUND
L-CH SPEAKERS
SP2
FULL-RANGE
SP1
FULL-RANGE
R-CH SPEAKERS
SP3
SURROUND
SO501
AC POWER
AC110-127V/
220-240V
50/60Hz
R566
100K
R440
D305
C342
470/16
27K
1N4148
R564
22K
C440
R567
22K
10/16
D525
D524
C535
4.7/50
C533
4.7/50
VR301
50K(B)
MIC
VOLUME
1N4148
1N4148
D523
1N4148
9014 C
MUTE
0.1
C508
Q510
R557
1K
Q508
9014 C
MIC AMP.
R558
33
R351
SW402
SURROUND
ON/OFF
D402
1N4148
C507
C505
10/16
100/16
C537
10/16
R568
1K
R565
5.6K
R556
150K
C532
500P
1K
SW401
SURROUND
MODE SELECT
SW402-B
ON
OFF
D517
1N4148
FUSE
RESISTOR
REGULATOR
R548
R502
SW404-B
SW401-C
Q501
8050 C
VOLTAGE
100
D522
1N4148
680
D505
R344
4.7K
C341
4.7/50
C536
47/16
LIVE
R421
10K
R442
10K
R441
10K
R420
10K
4.7
R501
RADIO
CD/LINE
FUNCTION
SELECTOR
R343
330
R350
3.9K
HALL
D518
FUSIBLE
D509
TAPE
SW404
Q303
9014 C
MIC AMP.
C343
500P
R450
4.7K
D519
1N4001
Q402
9014 C
POWER MUTE
Q401
9014 C
POWER MUTE
1N4148
Q506
2SB1370
SWITCHING
R545
22K
1N4001
C522
3300/25
D507
1N4001
R346
C344
470K
4.7/50
0.0047(ML)
SW402
SURROUND ON/OFF
SW402-A
ON
OFF
SW401
SURROUND
MODE SELECT
SW401-D
HALL
LIVE
C424
C422
0.0015(ML)
1/50
C426
100/16
C425
100/16
C421
C423
1/50
0.0015(ML)
F1
T1.25A
L250V
R535
330/1W
R537
10K
R419
3.3K
R418
3.3K
VCC
GND
LO0
RO0
CNS101
CNS105
C345
SW401-B
RI0
LI0
MAIN PWB-A
78 9101112
Figure 9 SCHEMATIC DIAGRAM (2/6)
– 9 –
WQ-740W/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
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
1
6
ABABABABA
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)
WQ-740W
A
B
C
D
E
F
G
H
1
2
34 5
Figure 10 WIRING SIDE OF P.W.BOARD (1/5)
6
– 10 –
C
B
SW301
A
BEAT CANCEL
FROM
POWER PWB
CNH110
P13 6-C
L-CH
J2
CD/LINE
R-CH
SW301
J1
HEADPHONE
2 1
CNS110
C522
6
5
4
3
2
1
J2
R422
C
B
A
R423
CNS106
Q507
C450
C353
C357
C459
R333
R452
R453
R451
C356
E
B
C
R535
R454
E
Q301
B
C
C354
T301
F1
T1.25A L 250V
C355
R537
B C E
Q506
C437
C433
C429
C431
C430
C432
C434
IC502
321
R568
C537
D507
CNS105
1 2 3 4 5 6 7 8 9 10
TAPE SPEED
Q504
Q505
R332
C511
E B C
E B C
D401
R510
R513
L501
14
13
12
11
10
C535
C351
R545
9
8
7
6
5
4
3
2
1
C352
IC402
C512
D509
R506
VR501
E B C
R508
R560
R561
R512
R330
Q503
D518
R501
D523
C428
C427
C469
D524
Q203
R241
D522
Q501
C426
R567
C263
R247
C
B
E
C425
Q510
E B C
R564
C B E
R502
C423
C424
C262
C401
R548
C421
C
B
E
R563
D519
E
B
C
C422
R243
C261
Q401
C259
CN4
C507
R562
1
2
3
4
5
6
7
Q402
D525
R246
R401
D505
R421
R441
R442
R420
C B E
R245
C505
R240
C508
C260
D526
D515
Q202
D305
C258
C530
R440
R345
D402
E B C
C440
D201
R559
Q509
D520
T201
RECORD/
PLAYBACK
PALY REC.
R322
C528
C319
L361
D521
R215
R217
C529
C229
C231
CF202
1 2 3
R206
R203
D203
R204
R205
SW302
R317
1
2
3
4
5
C211
C210
R315
R319
R249
R213
R336
R361
C361
R367
CNS102
CNS101
R216
T203
R309
R307
C309
R303
C317
C311
R327
6
5
4
3
2
1
C227
R214
C228
R201
1
2
3
4
5
6
7
8
9
IC201
C201
L304
C305
R326
C208
R202
BK
BK
WH
RD
1 2 3 4 1 2
CNH108
L303
1 2 3 4
C321
C202
R311
C313
R328
C207
R419
C224
C204
C315
CF203
1
2
3
L201
L202
C307
R313
C226
CF201
3 2 1
R221
C230
C516
BCDEFA
C325
C407
R212
R305
C363
R418
C232
C225
C326
R364
C338
12
C235
L203
CNS108
CNS107
1 2 3
C303
C301
24
C365
20
15
13
C327
R416
C404
C414
C416
C417
R415
15
10
20
5
IC202
1
C214
C213
TC201
C203
VC201
VC202
TC202
C206
TC204
C304
C302
5
IC301
10
C413
C223
C256
13
24
R222
R306
1
12
C412
R211
TC207
VC203
VC204
TC203
L204
C314
1
8
R406
VCO
C221
C236
C364
R325
R412
R410
2
VR201
TC205
C308
C366
C316
R409
R411
R219
T202
C312
R250
R408
3
657
C318
R404
C517
R308
4
C219
C218
C306
R314
R403
R210
R209
R304
R407
R208
L205
C515
R320
R316
R310
R362
C362
D516
C222
C237
WQ-740W/WQ-780W
BK
RD
C310
C320
C410
IC401
C411
C220
R223
R312
R318
C243
R555
D517
R207
R351
L302
C520
R405
R218
C534
TC210
TC209
C244
C239
SW302
C342
R321
C408
C415
R413
C409
C212
C245
R344
R532
Q508
C527
R324
R450
C241
R350
R557
CNH109
R343
C536
E
B
Q303
C
R558
E
B
C
R368
R323
R341
E
B
C
Q302
R355
R354
C
D
R566
L208
C238
C242
C347
C343
R346
C532
C533
C323
R533
SW401
SW404
R220
C240
R556
R531
C521
B
A
R349
1
2
R534
C341
SW402
C
D
E
F
G
H
A
C346
C344
VR301
MIC101
BUILT-IN
MICROPHONE
CNS109
C345
R553
R552
R555
B
A
B
A
D507
D
C
B
A
SW403
B
RD
D202
C233
BK
R554
MIC VOLUME
SW201
VR202
FINE TUNING
MIC1MIC2
MICROPHONES
VR301
MIN
MAX
SW402
SURROUND
ON/OFF
ON OFF
SW401
SURROUND
MODE SELECT
HALL
LIVE
STAND-BY
SW404
FUNCTION
SELECTOR
CD/LINE RADIO TAPE
ON
SW201
BAND SELECTOR
SW2 SW1 MW FM
MIC
SW403
NORMAL
DUBBING SPEED/
HIGH
FM STEREO FM MONO
BUILT-IN MICROPHONE/FM MODE
MAIN PWB -A
(281)
FM/SW ROD ANTENNA(277)
L206
MW
MW/SW1
BAR ANTENNA
L207
SW1
78 9101112
Figure 11 WIRING SIDE OF P.W.BOARD (2/5)
– 11 –
WQ-740W/WQ-780W
WQ-740W
A
B
C
D
CN205
P9 10-G
CNS101
TO MAIN PWB
FM SIGNAL
VR102-A
R112
8.2K
C108
0.01(ML)
R114
8.2K
R108
12K
0.022(ML)
0.01(ML)
C115
0.022(ML)
VR102-B
330Hz 1kHz 3.3kHz 10kHz
VR102-A
R116
5.6K
C116
(B)
VR102-B
100K
R115
5.6K
X-BASS
VR101-A
VR101-B
R106
12K
C102
C103
470/16
R191
100
1
1
2
3
4
5
6
6
0.1
R101
1K
R102
1K
R103
560
C105
0.022
R105
12K
C106
R104
560
0.022
R645
R644
68K
68K
50K(B)
VR101-A
R110
R111
50K(B)
VR101-B
C107
18K
R109
R113
R107
18K
8.2K
8.2K
12K
R118
4.7K
100K(B)
C110
0.0068(ML)
R120
4.7K
0.022(ML)
R117
4.7K
C109
0.0068(ML)
R119
4.7K
C117
0.022(ML)
C118
R121
2.2K
GRAPHIC EQUALIZER
(B)
VR103-A
100K
C112
R126
3.3K
0.012(ML)
R123
3.3K
C111
0.0022(ML)
R125
3.3K
C119
0.012(ML)
VR104-A
VR104-B
0.0022(ML)
R128
1.5K
C120
VR104-B
R127
1.5K
100K(B)
VR103-A
VR103-B
R122
2.2K
100K(B)
VR103-B
R130
820
100K(B)
VR104-A
C114
R132
820
0.0068(ML)
R129
820
C113
100P
C121
0.0068(ML)
VR105-A
VR105-B
100P
C122
GRAPHIC
EQUALIZER
R131
820
100K(B)
VR105-A
R134
1K
AMP.
100K(B)
VR105-B
1K
R133
R138
3.9K
C176
500P
R136
680K
C124
1/50
Q101
9014 C
R137
680K
C123
1/50
C177
500P
Q102
9014 C
GRAPHIC
EQUALIZER
AMP.
R135
3.9K
C125
1/50
C126
1/50
E
F
G
CN207
CN4
P9 12-C
TO MAIN PWB
R182
C182
100/16
C183
R643
330
D133
HALL
IFR-553PD
0.1
33
R626
330
C184
10/16
D126
POWER
R183
5.6K
R184
47K
D130
STEREO
R651
330
D136
HALL
C185
10/16
+B
+B
IC103 AN6884
SOUND LEVEL METER
8
9
R169
100
+B
C149
1/50
R168
C148
470K
10/16
C147
10/16
R638
56K
D134
1N4148
R637
56K
+B
C191
22/16
R640
33K
6
5
7
47
R614
R615
D115
R167
82K
Q107
9012 G
SOUND LEVEL METER
LED CONTROL
R636
1K
Q106
9014 C
SOUND LEVEL METER
LED CONTROL
47
D114
R613
47
D113
47
R612
D112
1234
47
R611
D111
D111~D113:IFR-553PD
D114,D115:IFR-523HD
+B
+B
R180
2.2
FUSIBLE
R181
680
1
1
2
3
4
5
6
7
7
15V
GND
HALL
LIVE
POWER
STEREO
+B
R650
330
D135
LIVE
Q103
2SD2061
VOLTAGE
REGULATOR
D131
C180
100/16
R628
R642
330
330
D128
D132
LIVE
LIVE
+B
D126,D128,D129
D132,D133
D135,D136
D130:IFR-523HD
0.1
C181
+B
R631
56K
R632
56K
R629
330
D129
HALL
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
1
2
34 5
Figure 12 SCHEMATIC DIAGRAM (3/6)
GRAPHIC EQUALIZER PWB-B2
6
– 12 –
SO501
AC POWER INLET SOCKET
AC110V-127V
50/60Hz
AC220V-240V
50/60Hz
RD
RD
WQ-740W/WQ-780W
RD
POWER PWB-C
RD
T501
POWER
TRANSFORMER
BK
BL
RD
WH
WH
C504
D501
C501
D502
C502
D503
C503
D504
BK
F501
T2A L 250V
CNH110
RD
11
BK
22
TO MAIN PWB
CNS110
P11 7-C (WQ-740W)
P17 7-C (WQ-780W)
COLOR TABLE
BR
BROWN
RD(R)
OR
YL
GR
BL
VL
GY
WH(W)
BK
PK
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
AC220-240V
(280)
BATTERYS
AC110-127V
DC15V
[ "D" SIZE (UM / SUM-1,
SW505
VOLTAGE
SELECTOR
(281)
78 9101112
Figure 13 WIRING SIDE OF P.W.BOARD (3/5)
– 13 –
R20 or HP2) battery X10 ]
(279)
WQ-740W/WQ-780W
L
A
A
0
M
T
WQ-780W
A
B
C
D
RECORD/PLAYBACK
E
PLAYBACK HEAD
SIDE-A
L-CH
SIDE-B
SIDE-A
R-CH
F
SIDE-B
G
CD/LINE
H
ROD ANTENNA
TAPE1
HEAD
L-CH
R-CH
+
ERASE
HEAD
TAPE2
DIRECTION
J2
FM/SW
SW504-A
B
A
SW504-B
SW504
TAPE2
1N4148
CNH108
CNS108
LA
1 1
GA
2 2
BA
3 3
RA
4 4
A
B
CNH107
CNS107
LB
1 1
GB
2 2
RB
3 3
R452
47K
L-CH
R454
2.2K
GND
R-CH
R453
2.2K
R451
47K
SW201
BAND SELECTOR
SW201-B
D202
SW201
BAND SELECTOR
MW
TRACKING
SW201-F
FM
MW
SW1
SW2
VC203
SW201-C
FM
MW
SW1
SW2
TC210
fH
SW2
TRACKING
fL
RECORD/PLAYBACK
SW302-B
PR PR
SW302-E
P R
C517
150P
BEAT CANCEL
C357
120P
C201
0.001
FM
MW
1 2 3
SW1
BAND PASS
SW2
FM RF
L201
C203
22P(CH)
fH
fL
FM
TRACKING
fL
fH
TC207
TC209
L206,L207
MW/SW1 BAR
ANTENNA
C245
12P(CH)
C321
C516
130P
150P
SW302-C
SW302-D
C356
430P
L304
22mH
C301
0.001(ML)
C302
0.001(ML)
C527
470P
R321
12K
AC BIAS CIRCUIT
C355
0.0015(ML)
OSCILLATION
SW302
C515
130P
L303
22mH
SW301
ABC
P R
FM SIGNAL
MW/SW1/SW2 SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
CF201
FILTER
108MHz
C204
0.001
C244
5P(CH)
C303
470P
T301
BIAS
C243
7P(CH)
C304
1
TC201
SW1 ANTENNA
SW2 ANTENNA
C307
0.033(ML)
C365
330P
24
1 2 3 4
C366
330P
470P
IC201
LA1186N
FM FRONT END
2 3 4
C202
R201
10
L206
MW
ANTENNA
L207
L208
R322
12K
C528
470P
R305
56
R311
150K
C305
33/16
C363
330P
23
C364
330P
C306
33/16
R306
56
0.0056(ML)
0.01(ML)
6
5
7
0.001
C206
20P(CH)
FM
OSCILLATION
L202
VC201
R203
22K
C211
0.022
SW201-E
FM
MW
SW1
SW2
SW201
BAND SELECTOR
fL
SW1
TRACKING
fH
SW201-G
C241
3P(CH)
R220
220
VR202
5K(B)
FINE TUNING
Q509 9014 C
DUBBING CONTROL
R326
33K
C325
47/16
3.9K
R307
4.7K
R309
C309
4.7/50
R303
180K
20
22
21
19
18
IC301
TA8189N
RECORD/PLAYBACK AMP.
6
5
7
3.9K
R310
C310
4.7/50
R304
C353
C354
R333
180K
27K
C308
0.033(ML)
R308
R332
150K
10
4.7K
R312
10K
R325
8050 C
BIAS OSC.
C352
100/16
C207
R559
100K
Q301
8
3P
C210
10/16
R219
100
VC204
C327
1000/10
C326
2.2/50
17
8
R324
C323
22/16
TC202
FM
MW
SW1
SW2
C320
10K
C351
R202
16
4.7/50
9
C208
33
VC202
R317
180K
9
R320
180K
10/16
0.022
R205
220K
33P(CH)
fL
fH
D203
1N4148
R204
100
C238
360P
TC203
C239
0.0022
TC204
C240
0.0047
TC205
fH
SW2 BAND
COVERAGE
L361
2.7mH
R319
2.2K
100
R328
C319
4.7/50
14
15
11
10
C318
R368
18K
R318
2.2K
R323
SW302-A
100
R330
FM BAND
COVERAGE
T201
MW BAND
COVERAGE
fH
fL
C361
0.015(ML)
R361
270
C317
10/16
C316
330P
R362
270
L302
2.7mH
0.015(ML)
10K
SW302-F
PR
P
R
FM IF
C235
10P(CH)
C236
5P(CH)
C237
5P(CH)
13
12
C362
SW403-B
PLAYBACK
RECORD/
R207
820K
C212
0.022
FM DETECTION
C214
0.022
FM IF
R206
47
10.7MHz
fL
L203
SW201-H
MW OSC.
L204
SW1 OSC.
C242
L205
0.022
SW2 OSC.
R327
100K
C311
0.0082(ML)
R367
18K
R313
22K
R315
330K
C313
4.7/50
C315
330P
C338
47/16
R364
1M
R250
C314
4.7/50
TAPE
R314
22K
330K
R316
C312
0.0082(ML)
C521
0.0033(ML)
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
HIGH/
FM STEREO
NORMAL/FM STEREO
MIC/
FM
MONO
SW302
10K
R513
CONTROL
R336
100
T202
C213
10/16
CF202
1 2 3
FM
MW
SW1
R222
47
SW1 BAND
fL
COVERAGE
fH
R223
47
R532
47K
C520
0.0033(ML)
SW404-C
C260
1/50
R249
18K
C258
1/50
C259
1/50
R241
150K
C261
1/50
18K
SW404-D
FUNCTION SELECTOR
CD/LINE
RADIO
R533
VR501
47K
470(B)
R510
10K
R512
10K
Q505
9014 C
TAPE
SPEED
R208
3.9K
1
C231
0.022
SW2
RADIO
TAPE
9014 C
LINE AMP
SW404
R355
18K
24
R221
Q202
23
3
2
C229
0.022
47
FM
MW
SW1
SW2
BAND SELECTOR
FUNCTION
SELECTOR
CD/LINE
R240
150K
R245
100
R247
1K
TAPE SPEED
R561
47
R506
3.9K
Q503
9015 C
TAPE
SPEED
CONTROL
R508
10K
Q504
9014 C
TAPE
SPEED
CONTROL
0.0047(ML)
22
C230
22/16
T203
AM IF
SW201
D521
1N4148
SW404
R354
18K
R246
1K
R243
100
Q203
9014 C
LINE AMP
C263
C220
R209
12K
19
18
IC202
LA1805
6
7
3
C228
1/50
R214
12K
R216
R401
100
D201
1N4148
R562
2.7K
R563
R404
2.2K
2.7K
10K
R403
10K
C219
470P
0.0082(ML)
C221
17
8
C226
C227
1/50
R407
2.7K
C512
0.1
C218
21
20
IF AMP.& FM MPX.
4
5
1
2
CF203
460kHz
AM IF
SW201-A
C233
0.022
C262
1/50
C401
470/16
1/50
R560
56K
C222
3.3/50
3.3/50
14
16
15
11
10
9
R212
C225
0.012(ML)
0.012(ML)
SW1
SW2
R213
12K
R215
2.2K
IC401
BA4558
OPE AMP.
3
2
R410
2.7K
12K
R408
C408
C410
0.0033(ML)
4.7/50
C411
4.7/50
C409
R409
0.0033(ML)
12K
IC401
BA4558
OPE AMP.
C404
10/16
KA7809
VOLTAGE
REGULATOR
1
C511
220/16
13
12
10
SW201-D
FM
MW
8
+
(1/2)
–
R412
12K
R411
12K
6
–
+
5
IC502
C224
1/50
D516
1N4148
R406
330
R405
R413
(2/2)
2
R210
150K
R218
100
10K
10K
4
1
7
3
NORMAL/FM S
VR201
10K(B)
C256
0.022
D527
1N4148
C534
4.7/50
C412
C416
220/16
C415
C413
1/50
L501
47µH
MIC/FM
HIGH/FM ST
R211
15K
VCO
C529
0.022
C232
220/16
CD/
1/50
100/16
R
R416
R415
T
10K
10K
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
1
2
34 5
Figure 14 SCHEMATIC DIAGRAM (4/6)
– 14 –
6
WQ-740W/WQ-780W
6
SW403
DUBBING SPEED/
BUILT-IN MICROPHONE/
FM MODE
MIC/FM MONO
AL/FM STEREO
H/FM STEREO
R211
15K
O
C529
0.022
C232
220/16
2
7
48
2
0
6
0.0015
CD/LINE
RADIO
TAPE
10K
R416
10K
R415
C223
C407
10/16
R217
330
1N4148
FUNCTION
SELECTOR
C530
4.7/50
SW403-A
D526
SW404-A
SW404
C414
0.0033(ML)
C417
0.0033(ML)
D515
1N4148
D520
1N4148
R345
1K
R341
10K
Q302
9014 C
MUTE
R531
1K
R566
100K
D305
470/16
27K
R440
1N4148
R564
C342
22K
C440
R567
22K
10/16
D525
D524
C535
4.7/50
VR301
50K(B)
1N4148
1N4148
C533
4.7/50
9014 C
MIC AMP.
MIC
VOLUME
D523
1N4148
Q508
SW402
SURROUND
ON/OFF
D402
1N4148
Q510
9014 C
MUTE
0.1
C508
C507
C537
10/16
R568
R557
1K
R556
150K
C532
500P
R558
33
R351
1K
SW401
SURROUND
MODE SELECT
ON
C505
10/16
100/16
1K
R565
5.6K
SW402-B
D517
1N4148
FUSE
RESISTOR
C341
4.7/50
C536
47/16
LIVE
SW401-C
OFF
R421
10K
R442
10K
R441
10K
R420
10K
R501
Q501
8050 C
VOLTAGE
REGULATOR
R548
100
D522
1N4148
R502
680
D505
CD/LINE
FUNCTION
SELECTOR
R344
4.7K
R343
330
R350
3.9K
HALL
4.7
FUSIBLE
RADIO
SW404
R450
4.7K
POWER MUTE
POWER MUTE
D518
1N4148
SWITCHING
D509
1N4001
SW404-B
TAPE
Q303
9014 C
MIC AMP.
C343
500P
D519
1N4001
Q402
9014 C
Q401
9014 C
Q506
2SB1370
R545
22K
C522
3300/25
D507
1N4001
C422
1/50
C421
1/50
R346
C344
470K
4.7/50
C345
0.0047(ML)
SW402
SURROUND ON/OFF
SW402-A
ON OFF
SW401-B
SURROUND
MODE SELECT
SW401-D
LIVE
HALL
C424
0.0015(ML)
C426
100/16
C425
100/16
C423
0.0015(ML)
F1
T1.25A
L250V
R535
330/1W
R537
10K
R419
3.3K
R418
3.3K
VCC
GND
LO0
RO0
RI0
LI0
CNS101
CNS105
HALL
R552
4.7K
R555
4.7K
C347
10/16
LIVE
SW401
5
2
3
14
IC402
LA4508
12
13 11
1
D401
1N4001
C469
220/16
SWITCHING
Q507 9014 C
CNH110
CNS110
1
1
2
2
CNS102
5
5
4
4
3
3
2
2
1
1
CNH102
1
2
3
4
5
6
FROM GRAPHIC EQUALIZER PWB
1 1
2 2
3 3
4 4
5 5
6 6
+
7 7
–
8 8
B
9 9
A
10 10
CNS1
R554
R553
680
680
R349
2.2K
SW401
SURROUND
MODE SELECT
SW401-A
LIVE
HALL
C459
2.2/50(N.P)
C427
0.01(ML)
C428
0.01(ML)
10
4
6
C430
100/16
7
C429
100/16
9
POWER AMP.
8
C437
470/25
POWER PWB-C
C502
0.1
D504D503
C504
0.1
C503
D501~D504'RL202DC
5
C471
820P
1
CN205
P18 1-C
SW502
TAPE1 MAIN
SW501
TAPE2 MAIN
SW503
TAPE2 PLAY
M501
M
TAPE MOTOR
C434
1000/10
0.18(ML)
0.18(ML)
C433
1000/10
0.1
0.1
C501
VR401-B
C346
4.7/50
C432
C431
T2A L250V
D501
D502
R471
8.2K
50K(B)
VOLUME
C450
2.2/50(N.P)
F501
C473
0.068
R534
4.7K
R422
120
R423
120
T501
POWER
TRANSFORMER
BATTERYS
DC15V[" D " ISIZE(UM/SUM-1,
R20 OR HP-2)BATTERYx10]
R472
8.2K
C472
0.068
VR401-A
VOLUME
MIC2
MIC1
1 1
2 2
CNS109 CNH109
CN2 CNS2
1 2 1
2
1
2
FROM GRAPHIC
EQUALIZER PWB
3
4
5
6
7
CN4
CNS106
CNH106
TWL
1
1
L-CH
2
2
GND
3
3
GND
4
4
R-CH
5
5
TWR
6
6
J1
HEADPHONES
SW505
VOLTAGE
SELECTOR
AC220-240V
50/60Hz
AC110-127V
50/60Hz
C474
820P
50K(B)
VOLUME PWB-B1
MICROPHONES
BUILT-IN
MICROPHONE
MIC101
SW504-C
B
A
SW504
TAPE2 DIRECTION
CN207
P18 1-F
SP4
SURROUND
L-CH SPEAKERS
SP2
FULL-RANGE
SP1
FULL-RANGE
R-CH SPEAKERS
SP3
SURROUND
SO501
AC POWER
INLET SOCKET
AC110-127V/
220-240V
50/60Hz
MAIN PWB-A
78 9101112
Figure 15 SCHEMATIC DIAGRAM (5/6)
– 15 –
WQ-740W/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
1
6
ABABABABA
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
5
1
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
WQ-780W
A
B
C
D
E
F
G
H
1
2
34 5
Figure 16 WIRING SIDE OF P.W.BOARD (4/5)
6
– 16 –
C
SW301
BEAT CANCEL
FROM
POWER PWB
CNH110
P13 6-C
L-CH
J2
CD/LINE
R-CH
B
A
J1
HEADPHONE
SW301
CNS110
2 1
J2
C522
6
5
4
3
2
1
R422
C
B
A
R423
CNS106
Q507
C450
C353
C357
C459
R333
R452
R454
R453
R451
C356
E
B
C
R535
E
Q301
B
C
C354
T301
F1
T1.25A L 250V
C355
R537
B C E
Q506
C437
C433
C429
C431
C430
C432
C434
IC502
321
R568
C537
D507
CNS105
1 2 3 4 5 6 7 8 9 10
TAPE SPEED
Q504
Q505
C511
E B C
E B C
R332
D401
R510
R513
L501
C351
14
13
12
11
10
C535
C352
R545
9
8
7
6
5
4
3
2
1
IC402
C512
D509
R560
R506
VR501
E B C
R508
R561
R512
R330
Q503
D518
R501
D523
C428
C427
C469
D524
Q203
R241
R567
D522
Q501
C426
C263
R247
C
B
E
C425
Q510
E B C
R564
C B E
R502
C262
C423
C424
C401
R548
C421
R563
C
B
E
D519
E
B
C
C422
R243
C261
C259
Q401
CN4
C507
R562
1
2
3
4
5
6
7
Q402
D525
R246
R401
D505
R421
R441
R442
R420
C B E
R245
C505
C508
R240
C260
1
2
D526
D515
Q202
D305
C258
WQ-740W/WQ-780W
BK
RD
BK
R532
C409
R344
Q508
R324
R350
R557
C527
R450
C241
CNH109
R343
C536
E
B
Q303
C
R558
E
B
C
R368
R323
R341
E
B
C
Q302
R355
R354
C
D
R566
L208
C238
C242
C347
C343
R346
C532
C533
C323
R533
SW401
SW404
R220
C240
RD
R556
R531
C521
B
A
R349
1
2
R534
C341
SW402
C
D
E
F
G
H
A
C344
MIC101
BUILT-IN
MICROPHONE
CNS109
C345
C346
R553
R552
R555
VR301
B
A
B
A
D507
D
C
B
D202
A
C233
VR202
SW403
B
MIC1MIC2
MICROPHONES
R554
VR301
MIC VOLUME
MIN
MAX
SW402
SURROUND
ON/OFF
ON OFF
SW401
SURROUND
MODE SELECT
HALL
LIVE
SW404
FUNCTION
SELECTOR
CD/LINE RADIO TAPE
SW201
SW201
BAND SELECTOR
SW2 SW1 MW FM
FINE TUNING
MIC
SW403
NORMAL
DUBBING SPEED/
HIGH
BUILT-IN MICROPHONE/FM MODE
STAND-BY
ON
FM STEREO FM MONO
BK
BK
WH
RD
1 2 3 4 1 2
CNH108
R351
5
TC207
VC203
VC204
TC203
12
R306
1
C412
L204
R211
C314
1
8
R406
VCO
VR201
C221
C236
C364
R325
R412
R410
TC205
C308
2
C366
C316
R409
R411
R219
C312
R250
R408
3
T202
657
C318
R404
C517
R308
C219
C218
4
C306
R314
R403
R210
R209
L303
R304
R316
R407
R208
L205
C515
R310
R320
R362
C362
D516
C237
C320
IC401
C222
C410
C310
C411
C220
R223
R312
C243
R318
R555
D517
R207
L302
C520
R405
R218
C534
TC210
TC209
C239
C342
R413
C212
C244
SW302
R321
C408
C415
C245
RECORD/
PLAYBACK
E B C
C440
D201
R559
Q509
D520
T201
PALY REC.
R322
C528
C319
L361
D521
1
2
3
4
5
R215
R217
C529
C229
C231
CF202
1 2 3
R206
R203
D203
C211
C210
R204
R205
R317
R315
R319
R249
R213
R336
R361
C361
R367
CNS102
R216
T203
R309
C309
R327
6
5
4
3
CNS101
2
1
R214
C228
R201
1
2
3
4
5
6
7
8
9
R307
C305
R303
C317
C311
R326
C227
C201
C208
R202
IC201
CN2
R345
C530
D402
R440
C321
C202
R311
C313
C207
R328
R419
C224
C204
C315
C226
CF203
1
2
3
L201
L202
C307
R313
C230
CF201
3 2 1
R221
C516
C325
C407
R212
BCDEFA
R305
C363
R418
C232
C225
C326
R364
12
C235
C338
10
L203
1 2 3 4
C303
C301
24
C365
15
13
C414
C417
5
1
C203
C206
CNS108
CNS107
1 2 3
20
C327
R416
C416
R415
TC201
VC201
VC202
TC202
TC204
C304
C302
IC301
10
C404
C413
C223
C256
13
15
20
IC202
24
C214
C213
R222
L304
SW302
MAIN PWB -A
(281)
FM/SW ROD ANTENNA(277)
L206
MW
MW/SW1
BAR ANTENNA
L207
SW1
78 9101112
Figure 17 WIRING SIDE OF P.W.BOARD (5/5)
– 17 –
WQ-740W/WQ-780W
WQ-780W
A
B
TO MAIN PWB
C
D
CNS101
P15 10-G
CN205
1
2
3
4
5
6
FM SIGNAL
R112
8.2K
C108
0.01(ML)
R114
8.2K
R108
12K
(ML)
0.01
0.022(ML)
VR102-A
VR102-B
330Hz 1kHz 3.3kHz 10kHz
VR102-A
R116
5.6K
C116
0.022(ML)
100K(B)
VR102-B
R115
5.6K
C115
X-BASS
VR101-A
VR101B
R106
12K
C102
0.1
C103
470/16
R101
1K
R191
100
1
R102
1K
6
R103
560
C105
0.022
R104
R105
12K
C106
560
0.022
68K
R645
68K
R644
50K(B)
VR101-A
18K
R110
R111
8.2K
50K(B)
VR101-B
C107
18K
R109
R113
8.2K
R107
12K
R118
4.7K
100K(B)
C110
0.0068(ML)
R120
4.7K
0.022(ML)
R117
4.7K
C109
0.0068(ML)
R119
4.7K
C117
0.022(ML)
C118
R121
2.2K
GRAPHIC EQUALIZER
VR103-A
VR103-B
R122
2.2K
100K(B)
VR103-B
R124
3.3K
(B)
VR103-A
100K
C112
R126
3.3K
C111
0.0022(ML)
R125
3.3K
C119
0.012(ML)
VR104-A
VR104-B
0.0022(ML)
R128
1.5K
C120
0.012(ML)
R123
3.3K
VR104-B
R127
1.5K
VR104-A
(B)
100K
VR105-A
VR105-B
R130
820
C114
100K(B)
100P
R132
820
C122
0.0068(ML)
R129
820
100P
C113
R131
820
C121
0.0068(ML)
100K(B)
VR105-A
R134
1K
GRAPHIC
EQUALIZER
AMP.
100K(B)
VR105-B
R133
1K
C176
500P
Q101
9014 C
R137
680K
C123
1/50
R138
3.9K
R136
680K
C124
1/50
C177
500P
Q102
9014 C
GRAPHIC
EQUALIZER
R135
3.9K
C125
1/50
AMP.
C126
1/50
E
F
TO MAIN PWB
G
H
CN4
P15 12-C
CN207
1
2
3
4
5
6
7
1
7
15V
GND
HALL
LIVE
A-SIDE
B-SIDE
STEREO
R650
D135
330
LIVE
+B
+B
R180
2.2
FUSIBLE
R181
680
D131
R628
R642
330
D132
D128
LIVE
D126~D129
D132,D133
D135,D136
D130:IFR-523HD
330
LIVE
Q103
2SD2061
VOLTAGE
REGULATOR
C180
100/16
+B
R629
R643
330
D133
D129
HALL
HALL
IFR-553PD
330
0.1
C181
R631
56K
R632
56K
C182
100/16
R627
330
D127
A-SIDE
R182
33
0.1
C183
R626
330
D126
B-SIDE
C184
10/16
D130
STEREO
C185
10/16
+B
IC103 AN6884
SOUND LEVEL METER
8
9
R169
100
+B
C149
1/50
R168
C148
470K
10/16
C147
10/16
+B
R638
D134
1N4148
+B
R637
C191
22/16
56K
56K
R640
33K
6
5
7
47
R615
D115
R167
82K
Q107
9012 G
SOUND LEVEL METER
LED CONTROL
R636
1K
Q106
9014 C
SOUND LEVEL METER
LED CONTROL
R614
R183
5.6K
R184
47K
R651
330
D136
HALL
GRAPHIC EQUALIZER PWB-B2
47
D114
47
R613
D113
47
R612
D112
1234
47
R611
D111
D111~D113'IFR-553PD
D114,D115'IFR-523HD
+B
+B
1
2
34 5
6
Figure 18 SCHEMATIC DIAGRAM (6/6)
– 18 –
Loading...