Philco STC-9630 - Page 71

5
DETAILED CIRCUIT EXPLANATIONS
STC-9630 SERVICE MANUAL
SCHEMATIC DIAGRAM OF THE MAIN POWER AMPLIFYING BOARD
Vin
1
GND
2
Vout
3
N401 7809
VD401~VD404
RL254
C438 2.2u/16V
R450 22k
A+18V
A-18V
R452
22k
R451 1.5k
C439
22u/25V
C440 104
R453 10
C414 47u/16V
R454
22k
A+18V
A-18V
R456 22k
R455 1.5k
C441 22u/25V
C442 104
R457 10
R458 22k
R403
180
1 2
53
4
-
+
N408 LM1875
1 2
53
4
-
+
N407
LM1875
1 2
53
4
-
+
N409
TDA2003
C444 470u/25V
R460 47
R461
220
R462
2.2
C459
33p
C446
220u/25V
C434 2.2u/16V
C456 104
R463
10 C445
104
OUT1
1
OUT2
2
OUT3
15
OUT4
14
IN1
4
IN2
5
IN3
12
IN4
11
SVR
6
PG
8
SG
9
C.D
10
S-B
7
Vcc
13
Vcc
3
N410
TDA7370B
C451 47u/16V
C455
220u/25V
C454
220u/25V
C453
220u/25V
C452
220u/25V
FL402
T4AL250V
FL401
T4AL250V
1 2 3
XS1 3PIN
C403
4700u/25V
C404
4700u/25V
C411
4700u/25V
A+18V B+18V
A-18V
B+18V
A+18V
C458 104
C405 104
C406
104
C412
220u/16V
C407
470u/16V
C408
470u/16V
C413 104
VD411
5.1V
+5V+9V
VD410
12V
VD409
12V
R401
220/0.5W
R402
220/0.5W
+12V
-12V
C401 224 C402 224
R415
4.7k
R416
22k
R422
22k
R424
4.7k
R425
4.7k
R426
22k
C417 20p
C418
20p
C415 10u/16V
C432
10u/16V
C426 2.2/16V
C431 2.2u/16V
1 2 3 4 5 6 7
XS5
7PIN
IN1
1
IN2
2
IN3
3
CODE2
4
DGND
5
SCL
6
SDA
7
IN4
8
IN5
9
IN6
10
OUT1
20
OUT2
19
OUT3
18
CODE1
17
Vcc
16
REF
15
GND
14
OUT4
13
OUT5
12
OUT6
11
N403
PT2258D
REMOTE
G401
4M
1 2 3 4 5 6 7 8 9 10 11 12
XS3
11PIN
R406
1.5k
R405 680
R407
1.5k
R408 1.5k
R409
1.5k
R410
1.5k
R411
1.5k
R412
1.5k
Vs
C416
104
R404 10k
R464 100k
C457
10u/16V
C449 224 C447 224
C448 224 C450 224
+9V
R459
22k
R421
4.7k
R419
4.7k
R418
22k
R423
22k
R428 4.7k
R427
22k
R429 150k
R417
150k R420 150k
C420
2.2u/16V C419
2.2u/16V
C421
2.2u/16V C422
2.2u/16V
C423
2.2u/16V
R435
12k
R438
12k
R437
10k
3 2
1
8 4
N404A 4558
5 6
7
N404B 4558
C437
182
C425 182
C424 103
+12V -12V
R448
100k
R444
22k
R430 150k
R447
100k
R434
10k
C436 103
R436
100k
R446
47k
C435 2.2u/16V
3 2
1
84
N405A 4558
5 6
7
N405B
4558
3 2
1
8 4
N406A
4558
5 6
7
N406B
4558
-12V
-12V +12V
R443 10k
R440 10k
C427
2.2u/16V
C429 2.2u/16V
+12V
R439
100k
R433 100k
R445 100k
R442
100k
R449 220
C433 2.2u/16V
+5V
RESET
R465
22k
R432
100k
R441
22k
R431
150k
C443
2.2u/16V
R413 10
R414
10
C409
104
C410 104
Vs g1 REMOTE b1+c1 a2 b2 c2 d2 e2 f2 g2 GND
L
R
SL
SR
SR SL L R C GNDGND
VD405
RL254
VD406 RL254
C430 151
C428
151
C461
151
C460
151
RST/Vpp
1
P3.0
2
P3.1
3
XTAL2
4
XTAL1
5
P3.2
6
P3.3
7
P3.4
8
P3.5
9
GND
10
Vcc
20
P1.7
19
P1.6
18
P1.5
17
P1.4
16
P1.3
15
P1.2
14
P1.1
13
P1.0
12
P3.7
11
N402 AT89C2051
R466
10k
+5V
R467
47k
C462
151
Vs
Vs
R470
1.5k
VD412 1N4004 VD413 1N4004
From Trans.
To Display Board
1 2 3 4 5 6 7
XS2 7PIN
GG L R C SL SR SW
1 2 3 4
XP7
4PIN
Vs GND
From Input Board
To Sub-AMP Board
To Sub-AMP Board