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17.4. (B) Main Circuit
SCHEMATIC DIAGRAM - 3
: +B SIGNAL
MAIN CIRCUIT
: -B SIGNAL
SA-AK240P/PC MAIN CIRCUIT
1/4
C2114
C2214
0
0
R2112
R2212
3.3K
3.3K
R2111
R2211
2.2K
2.2K
W2501
0
PB_L
14
PB_R
13
GND
12
REC_IN_L
11
REC_IN_R
10
TO
+B
DECK
9
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
: MAIN SIGNAL LINE
: TAPE PLAYBACK SIGNAL LINE
C2101
1
C2112 1
C2212 1
C2122 1
C2222 1
C2132 1
C2232 1
C2152 1
C2252 1
R2102
3.3K
R2104
3.9K
R2204
3.9K
C2201 1
R2202
3.3K
+15V
C2976
16V10
MOT_12V
P_GND
REC[59]
Q2978
B1GDCFJJ0047
REC:ON/OFF CONTROL SWITCH
SW5V
Q2980
Q2980
B1GDCFJJ0047
W2553
SUPPLY CONTROL SWITCH
0
(DECK MOTOR)
MTR[58]
DECK_H
R2674
47K
R2675
R2301
15K
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
VCC
5
IN-L3
38
IC2803
6
IN-R3
R-OUT
37
C2401 0.12
C1BB00001121
7
IN-L4
POST-VM-R
36
C2402 0.22
8
IN-R4
AUDIO SOUND PROCESSOR
T-OUT-R
35
C2272 0.12
BASS-R2
9
IN-L5
34
C2271 0.15
10
IN-R5
BASS-R1
33
C2161 0.01
C2274 0.01
11
IN-L6
MID-R2
32
C2261 0.01
C2273 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
C2275
0
4.7K
100K
0.12
3900P
R2283
100K
C2509
C2283
0.047
16V33
63
Q2142
B1ABCF000176
AGC CONTROL SWITCH
Q2311,Q2411
B1ABGC000005
MUTING SWITCH
R2311
C2311
470
1
R2312
Q2311
10K
R2355
C2342
270K
1
C2442
R2455
R2401
15K
270K
1
Q2411
R2412
10K
C2411
1
R2411
470
Q2242
B1ABCF000176
AGC CONTROL SWITCH
C2583
16V100
R2273
R2271
D2583
C2588
Q2511
4.7K
15K
B0BC9R000008
0.1
B1GDCFJJ0047
MUTING CONTROL
R2510
C2585
R2585
C2584
R2509
220
220P
330K
220P
560
Q2511
R2347
1
R2512
R2511
2.2K
100K
C2511
R2586
50V2.2
R2584
1.2K
330K
N
W2546
0
W2526
0
SA-AK240P / SA-AK240PC
W2511
0
R2701
1K
C2
C2
R2702
1K
R23
56
R2145
R2146
10K
1K
R2314
C2312
0
1
4
3
2
C2704
R2313
470P
100K
IC2804
C0AABB0001
OP AMP
R2413
100K
R2414
C2412
5
6
7
0
1
C2413
47P
R2245
C2706
1K
50V1
R2706
3.3K
R2246
D2241
R2
B0ACCK000005
3.
1K
R2
3
R2247
C2245
R2248
100K
16V10
6.8K
R2342
R
W2513
W2531
33
Q2341,Q2441
0
0
B1ABGC000005
HEADPHONE MUTING
R2344
R
33
Q2341
R2346
3.3K
R2345
1.5K
R2357
100K
W2530
0
R2457
100K
R2445
R2446
1.5K
3.3K
Q2441
R2442
R
33
R2444
R
33
R2447
1
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