Panasonic SA-AK770PL Service Manual page 93

15 16 17
SCHEMATIC DIAGRAM - 3
MAIN CIRCUIT
: + B SIGNAL LINE
K2421 0
R2323
IC2804
68k
C2321
C0AABB000125
47p
C2341
OP AMP
10p
R2321
10k
1
4 3 2 1
IC2804
2
5 6 7 8
R2322
10k
Q2317,Q2417
3
B1ABGC000005
HEADPHONE MUTING
R2516
R2324
4.7k
68k
R2517 Q2317
10k
K2422
0
Q2417
R2417
10k
R2416
4.7k
R2331
0
C2323
0
C2324 R2328
R2332
0
0
5
IC2810
QR2317
C0ABBB000230
B1GDCFGA0018
SMT OP-AMP IC
MUTIING CONTROL
R2355
4 R2352
R2356 18
QR2317
18 18
C2357
C2358
1000p
R2365 1000p
R2358 R2357
100k
18 18
C2365
25V4.7
R2359 R2363
5.6k
1
R2361
Q2359
5.6k
R2448
22k
Q2360
R2362
5.6k
R2360
5.6k
Q2359,Q2360 R2364
1
B1ABGC000005
HEADPHONE MUTING
6
TO MAIN SECTION (1/4)
18 19 20 21
: - B SIGNAL LINE :MAIN SIGNAL LINE
R3125
K3100
0
0
C3107
C3109
6800P
0
C3105
1
R2318 R3111
100k 3.3k
R3113
10k
R3114
R2418 10k
100k
C3110
0
R3112
3.3k
C3106
1
R2327
C3108 R3126
18K
K3200
6800P 0
0
Q2371,Q2373
18K
B1ABCF000176
D2371,D2372
SW LV SWITCH
MA2J11100L
Q2372
C2371 R2370 R2373 B1ABCF000176
100P 12K
15K
SUBWOOFER LEVEL
R2386
CONTROL SWITCH
1K
R2380
R2376
5 6 7 8
3.3K
1K
Q2373
Q2371
IC2810
4 3 2 1
Q2372
R2382
R2385 R2383
10M 0
R2375
C2376 C2379 2.2K
C2374 R2371 0.1 1
0.01 47K
Q2374
Q2375
R2990
0
Q2374,Q2375
B1GDCFJJ0047
SWITCH SUPPLY SWITCH
TO MAIN SECTION (4/4)
22 23 24
Q2961
B1ACKD000006
FAN MOTOR ON/OFF SWITCH
D2940
MA2J11100L
R2966
Q2961
R2962
5.6K
R2963
10K
C2963
0.1
R2968
R2967 0
10k
D2968
B0ADCJ000020
3
1k
Q2947
2 1
R2958
100
R2969
56K
R2957
68
D2734
B0EAKM000117
Q2942
B1ACKD000006
FAN MOTOR ON/OFF SWITCH
C2944
R2944
1000p
5.6k
R2937
10k
C2942
0.1
93
25 26 27
CN5050
17
1 FRONTL
2 SIGNAL A_GND
3 FRONT R
C2561
AGND
0 4
5 SUBWOOFER
6 AGND
TO
7 SURROUND L
D-AMP CIRCUIT
8
AGND
(CN5050) IN
9 SURROUND R
SCHEMATIC
10 AGND
DIAGRAM - 16
11 CENTER
MUTE_S
12 MUTE S_C (MODE 1)
MUTE_F
MUTE F_SW (MODE 2)
13
14 FHOP
15 Fan
16 DC_DET
MOD_DA
MOD_DA
17 1
C2966
Q2962
0.1
B1ABCF000176
FAN SUPPLY CONTROL SWITCH
820k CN2820
1 POSITIVE
FAN
2 NEGATIVE
C2965
R2965
10K 16V47
Q2962
Q2947,Q2967
B1ABCF000176
DC DETECT SWITCH
R2959 68
Q2967
D2948
B0BC5R600003
C2967
220
CN2810
1
NEGATIVE FAN
2 POSITIVE
C2941
R2941 Q2943
16V47
Q2943 10k
B1ABCF000176
FAN SUPPLY CONTROL SWITCH
R2949
R2939
47k 47k
1/4 2/4
SA-AK770PL/GCP MAIN CIRCUIT
3/4 4/4
SA-AK770PL / SA-AK770GCP
28
A
B
K2003
...PL
0
K2004
...GCP
0
C
D
E
F
G
H