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17.4. (B) Main Circuit
SCHEMATIC DIAGRAM - 3
: +B SIGNAL
MAIN CIRCUIT
: -B SIGNAL
SA-AK640PL MAIN CIRCUIT
1/4
R2113
12K
R2213
12K
R2153
8.2K
R2253
8.2K
C2114
C2214
1
1
R2143
12K
R2243
12K
C2144
R2111
C2244
1
2.2K
1
W2501
0
PB_L
14
PB_R
13
GND
12
REC_IN_L
11
REC_IN_R
10
TO
+B
9
DECK
REC_H
CIRCUIT
8
(CN1001) ON
MO+B
7
SCHEMATIC
MO_GND
DIAGRAM-7
6
NC
5
DECK1_H
4
NC
3
MOTOR
2
NC
1
CN2803
R2122
C2121
3.3K
3300P
R2222
C2221
3.3K
3300P
R2121
R2221
3.3K
3.3K
TUNER RCH
: FM/AM SIGNAL LINE
: TAPE RECORD SIGNAL LINE
: CD SIGNAL LINE
: TAPE PLAYBACK SIGNAL LINE
: MIC SIGNAL LINE
: MAIN SIGNAL LINE
C2101
1
C2112 1
C2212 1
C2122 1
C2222 1
C2132 1
C2232 1
C2152 1
C2252 1
R2211
2.2K
R2102
3.3K
R2104
27K
R2103
2.2K
R2204
27K
C2201 1
R2202
R2203
3.3K
2.2K
+15V
MIC
C2976
16V10
MOT_12V
P_GND
REC[59]
Q2978
B1GDCFJJ0047
REC:ON/OFF CONTROL SWITCH
SW5V
A_GND
Q2980
B1GDCFJJ0047
W2553
SUPPLY CONTROL SWITCH
0
MTR[58]
DECK_H
R2674
47K
R2675
C2263
R2161
R2261
50V1
4.7K
4.7K
R2163
56K
56
55
54
53
52
51
50
49
48
47
46
45
44
43
IN-L1
1
L-OUT
42
2
IN-R1
NC
41
3
IN-L2
DATA
40
4
IN-R2
CLK
39
5
IN-L3
VCC
38
IC2803
6
IN-R3
R-OUT
37
C1BB00001121
7
IN-L4
POST-VM-R
36
AUDIO SOUND PROCESSOR
T-OUT-R
35
8
IN-R4
9
IN-L5
BASS-R2
34
10
IN-R5
BASS-R1
33
C2161 0.01
11
IN-L6
32
MID-R2
C2261 0.01
12
IN-R6
MID-R1
31
TRE-R
13
GND
30
C2581 16V100
14
REF-IN
NC
29
W2506
0
15 16 17 18 19 20 21 22 23
24
25
26
27
28
C2582
16V100
W2503
0
W2520
0
W2577
R2193
R2194
C2194
0
4.7K
100K
0.1
R2283
100K
C2283
0.047
C2501
R2501
R2503
D2503
1
330K
2.7K
B0ADCC000002
C2503
1
Q2501
B1ABCF000176
R2507
LEVEL METER
100K
CONTROL SWITCH
R2504
100
R2502
82K
R2505
0
Q2980
(DECK MOTOR)
63
B1ABGC000005
R2311
C2311
1
470
R2312
10K
R2355
270K
C2401
0
R2455
C2402 1
270K
C2272 0.082
C2271 0.15
R2412
10K
C2274 0.01
C2411
1
C2273 0.01
R2411
470
C2583
16V100
R2273
R2271
C2275
D2583
C2588
4.7K
6.8K
3300P
B0BC9R000008
0.1
B1GDCFJJ0047
MUTING CONTROL
C2509
C2585
R2585
C2584
R2510
16V33
220P
330K
220P
R2509
220
560
Q2511
C2507
R2508
0.22
1K
R2511
R2512
100K
2.2K
C2511
50V2.2
R2584
R2586
330K
1.2K
N
W2546
0
W2526
0
SA-AK640PL
W2511
0
R2701
1K
C2
C2
Q2142
B1ABCF000176
R2702
AGC CONTROL SWITCH
1K
R23
56
R2145
R2146
Q2311,Q2411
1K
1K
MUTING SWITCH
R2314
C2312
0
1
Q2311
4
3
2
C2704
R2313
470P
100K
C2342
IC2804
10
C0AABB0001
C2442
OP AMP
1
R2413
Q2411
100K
R2414
C2412
5
6
7
0
1
C2413
47P
R2245
C2706
1K
50V1
R2706
3.3K
D2241
R2
R2246
Q2242
B0ACCK000005
3.
1K
B1ABCF000176
AGC CONTROL SWITCH
R2
3.
R2247
C2245
R2248
100K
Q2511
16V10
6.8K
R2342
R
W2513
W2531
0
Q2341,Q2441
0
0
B1ABGC000005
HEADPHONE MUTING
R2344
R
0
Q2341
R2347
R2346
1
3.3K
R2345
1.5K
R2357
100K
W2530
0
R2457
100K
R2445
R2446
1.5K
3.3K
Q2441
R2442
R
0
R2444
R
0
R2447
1
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