WQ-740W/WQ-780W
– 14 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 6.
A
B
C
D
E
F
G
H
1
2
3
4
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
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
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
P
R
P
R
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
P
R
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
1
1
2
2
3
3
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
A B C
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
47
µ
H
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
RA
TA
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 ST
HIGH/FM ST
HIGH/
FM STEREO
NORMAL/FM STEREO
MIC/
Q509 9014 C
DUBBING CONTROL
P R
SW504
TAPE2
DIRECTION
