Technics SA-EH790E, Service Manual

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SH-EH790(E) MAIN CIRCUIT DIAGRAM
SCHEMATIC DIAGRAM-4
IC301
M5218AP
BUFFER AMP
A
B
1 2 3 4
5 6 7 8
IC302
NJM4558MTE1
BUFFER AMP
C
D
1 2 3 4
5 6 7 8
Q313,314
2SD2144STA
ATTENUATOR
F
C305
100P R315
270K
C307
10P
C303
50V4.7
C310
0.01
C306
100P R316
270K
C308
10P
C309
0.01
C304
50V4.7
R314
3.9K
R310
560
R308
1K
R307
1K
R309
560
R313
3.9K
R306
1K
R305
1K
R304
22K
R303
22K
C301
50V4.7
C302
50V4.7
Q301,302
2SD2144STA
MUTING
Q301
Q302
Q303
Q304
Q303,304
2SD2144STA
ATTENUATOR
R349
12K
R352
10K
D301
MA700ATA
R353 220K
C329
16V22
R348
2.2K
R325
1K
R327
560
C313
16V10
C315
100P
C317
5600P
R329
560K
R335
1K
R336
1K
R338
470
R322
8.2K
R334
56K
R323
12
R324
12
R326
1K
C328
16V22
R328
560
C314
16V10
C316
100P R330
100K
C318
47P
R332
2.2K
C320
16V10
R350
10K C327 0.033
D302
MA165TA
R351 220K
C323
0.01
C324
0.01
R319
150K
C312
16V22
R318
100
Q306
UN411FTA
ATTENUATOR CONT.
Q305
UN411FTA
MUTING CONT.
C31
1
16V10
R317
22K
R312
1.8K
Q309
Q310
Q307
Q308
Q307,308
2SD2144STA
ATTENUATOR
A
B
R354
3.3K
R347
1K
R345
1K
R346
1K
Q313
Q314
Q309,310
2SD2144STA
ATTENUATOR
L301
3.3 H
R311
22K
MAIN CIRCUIT
B
R331
2.2K
C319
16V10
R337
390
L302
3.3 H
E
C321
16V10
R372
0
R333
56K
C322
16V10
R374
0
O
R866
22K
N
A
B
C
IC303
NJM4558MTE1
BUFFER AMP
C345
100P R365
180K
C347
22P
C343
16V10
R361
6.8K
R359
820
R360
820
R363
1K
R364
1K
C346
100P R366
180K
C348
22P
C352
0.01
C344
16V10
R362
6.8K
Q315
Q316
Q315,316
2SD2144STA
ATTENUATOR
1 2 3 4
5 6 7 8
R368
470
R367
470
R357
22K
R358
22K
R504
120K
C502
330P
R503
1.2K
1 2 3 4
5 6 7 8
C503
100P
Q502
UN411FTA
ATTENUATOR CONT.
R502
1K
R509
2.2K
R514
100
C510
16V22
Q501
UN411FTA
MUTING CONT.
IC501
NJM4558MTE1
BUFFER AMP
C
D
G
R517
820
R513
1K
R515
22K
C511
16V10
C504 100P
R508 100K
R506
2.7K
C508
16V10
C501
0.01
C506
16V33
R505
1K
R510 100K
R511
1M
C507
50V0.47
R512
150K
C512
16V33
Q505
2SD2144STA
ATTENUATOR
Q503,504
2SD2144STA
MUTING
Q503
Q504
F
E
C505
0.01
C351
0.01
R773
1K
Q764
2SB621ARSTA
REGULATOR
C765
0.01
D763
MA165TA
R769
1.2K
D764
MA165TA
C771
0.01
C766
16V10
Q765,767
2SC3311ATA
STABILIZER
Q765
R767
1K
D767
MA4051MT
A
C768
16V10
Q767
R768
1.2K
D765
MA165TA
D766
MA165TA
C772
0.01
C767
0.01
D762
RL1N4003N02
C753
0.01
R761
2.2
R762
2.2
C761
0.01
Q761,762
2SD2137PQTA
REGULATOR
C763
0.01
R765
220
C764
10V220
R764
820
D761
MA4082LTA
C762
0.01
Q763
2SD592AQRSTA
REGULATOR
R766
1.8K
D304
MA719TA
C354
16V10
D305
MA719TA
C349
16V10
C350
16V10
R507
1M
C509
16V22
D771
MA4051L
T
A
Q506
UN411FTA
ATTENUATOR CONT.
R518
2.2K
Q507
2SD2144STA
ATTENUATOR
D
T
D772
MA165T
A
R774
220
C774
16V220
R716
820
C773
10V220
Q761
Q762
Q766
2SA1309ATA
REGULATOR
C356
16V10
R772
1.2K
R501
1.5K
R520
1.2K
L502
E
D203
MA165TA
D204
MA719TA
I
J
R519
150K
A
B
C
Y
X
:NEGATIVE VOLTAGE LINE :POSITIVE VOLTAGE LINE :CD PLAYBACK SIGNAL LINE
0V
0.6V
0V
0.6V
0V
0V
0.6V
0.6V
0V
0V
0V
0V
0V
0V
0V 0V
0V 0V 9.4V
-10.4V
0V 0V
0V 0V 9.4V
-10.4V
0V
0V
0.6V
0.6V
0.6V
0.6V
0V
0V
1.2V 1.3V
0V
1.1V 0.9V
-
10.4V
9.4V
5.1V
9.4V
-10.4V
0V
0V
0.7V
0.7V 1.8V 1.8V
0V
0V 0V 0V
0V 0V 9.4V
0V 0V -10.4V
0V 0V 9.4V
10.2V
10.2V
9.4V
7.2V
10V
7.8V
7.2V 10.2V
7.8V
5.1V
5.4V
4.4V
6V
5.4V
5V
6V
5V
5.1V
5.4V
5.4V
4.4V
0.6V
0V
0.6V
0V
0.6V
0V
1.1V 0.9V
0V
-6.5V
-7.3V 5V
-10.4V