B) Main Circuit - Panasonic SA-AK450GCP Service Manual

SA-AK450GCP

19.2. (B) Main Circuit

1 2 3
SCHEMATIC DIAGRAM - 2
A
MAIN CIRCUIT
B
C
QR3105,QR3106
B1GBCFGG0030
SWITCH
D
QR3106
QR3105
PL 1
MOTOR_H 2
MO_GND 3
R2111
DECK_AD2 4
2.2K
MOTOR 9V 5
DECK_AD1
6
R2211
+9V
7
PB_L 2.2K
PB_L 8
PB_R R2112
TO
PB_R 9
E 5.6K
A_GND
DECK CIRCUIT
A_GND 10
(CN1305)
A_GND 11
IN SCHEMATIC
REC_IN_L 12
DIAGRAM-10
REC_IN_R 13
REC_H 14
BP 15
DMT 16
DVREF 17
VREF-GND 18
DGND 19
+5V 20
PHOTO 21
CN2803
F
G
H
4 5 6
: +B SIGNAL LINE : CD SIGNAL : TAPE RECORD SIGNAL LINE
W581
0
MIC
R2161 C2263
C2182
15K 50V1
1
R2163
56K
MIC_MIX
56 55 54 53
C2112 1u
1
C2212 1u
2
C2122 1u
3
C2222 1u
4 IN-R2
[1] IN-L1
C2132 1u
5 IN-L3 [2] IN-R1
C2232 1u
[3] IN-L2
IN-R3
6
C2152 1u
7 IN-L4
1u
C2252
IN-R4
8
[12] IN-R6
9 IN-L5
[13] GND
10 IN-R5
[14] REF-IN
C2142 1u
11 IN-L6
C2242 1u
12
W582
W619 13
0 C2581
0
16V100 14
C2213
6800P
15 16 17 18
C2582
16V100
R2102
2.2K
W579 W677
R2204 C3720
0 0 W675
27K 1
0
R2104
27K C3721
1
W667
0
W674
0
REC_L
PL
MTR[58]
REC_R
W580
OUT 3 0
REF_L
2 GND
D2871 D2872
+15V
1
VCC
D2871-D2872
IC2872
REF_R
R2503
B0EAKM000117
+9V
2.7k
C2503
AGND
1u
R2501
P_GND
330k
DECK_AD2
Q2501
DECK_AD1
W575
R2504
REC_IN_L
0 100
R2502
REC_IN_R
82k
R2505
DMT A_GND 0
DVREF+
U_GND
REC[59]
C2501
1u
+5V B1ABCF000176
W661 W656 +3.3V
0 0
PHOTO
W592
0
R2203
IC2872
2.2k
REC_L
C0CBAHG00011
R2103
VOLTAGE REGULATOR
REC_R 2.2k
TO MAIN SECTION (3/4)
7 8 9
: TAPE PLAYBACK SIGNAL LINE : FM/AM SIGNAL LINE : MAIN SIGNAL LINE
R2173
4.7K
R2172
6.8K
C2181 R2301
Q2311,Q2411
15K
1
B1ABGC000005
MUTING SWITCH
C2302
0.22
C2311
R2311
1u 470
52 51 50 49 48 47 46 45 44 43
IC2803
R2312 R2355
C2342
42 C1BB00001121
10k 270K 1u
41
AUDIO SOUND PROCESSOR
40
A_GND
[42] L-OUT
39
[41] NC
R2412
VCC 38
[40] DATA 10k
[39] CLK
R-OUT 37
R2401
IC2803 C2401 0.22u
R2455 C2442
POST-VM-R 36 C2411
270k 1u
1
C2402 15K
1u
[32] MID-R2 T-OUT-R 35
C2272
[31] MID-R1 0.15
BASS-R2 34
[30] TRE-R R2411
C2271 0.15
BASS-R1 33 470
[29] NC
32
31
W583
30
0
29 Q2142,Q2242
B1ABCF000176
19 20 21 22 23 24 25 26 27 28
C2195
AGC CONTROL SWITCH
R2195 0.47u
10k
R2196
10k
C2194
0.15 W651 W597
0 0
R2283
R2194
100k
100k
C2283
R2510
0.047u
220
C2509
D2191
50V33 Q2511
B0ACCK000005
B1GDCFJJ0047
R2509
MUTING CONTROL
560
D2503
R2511
B0ADCC000002 560 R2512
100k
2
C2507
0.22
3
C2511
1 50V22
W641
R2507
0
100k
R2508
1k
Q2501
W596 W671
LEVEL METER
0 0
CONTROL SWITCH
66
10 11 12
: AUX SIGNAL LINE : MIC SIGNAL LINE
IC2804
C0AABB000125
C2705
OP AMP
1u
C2315
R2703 C2313 R2315
R2705
220K 47P 56K 50V22
3.3k
C2314
C2703
W584 10P
Q2311 470P
0
C2312
4 3 2 1
R2313 1u
100k
IC2804
R2413
100k C2412 5 6 7 8
1u
C2414 W589
Q2411 0
R2704
10P
220k
C2413 R2415 C2415
47P 56K 50V22
C2704
C2706 R2706
470P
D2241
1u 3.3K
R2249
R2245 B0ACCK000005
R2145
1K 3.3K
1K R2146
1K
Q2142
W591 R2149
R2246
D2241 3.3K
1K 0
Q2242
C2245
16V10
R2247 R2248
W588
W600 100k 6.8k
0
0
W590
0
R2701
1k
W669
0
Q2341,Q2441
B1ABGC000005
W670
0
HEADPHONE MUTING
R2347 R2341 R2352
Q2341
1 18 18
R2345
15k
R2346 L
R2344 R2343 R2354 R2353
3.3k
0
18 18 0
C2341
1000P
C2441
1000P
R2446 R2452
3.3k R
18
R2453
R2447
Q2441 R2445 R2441
0
1
15k 18
R2443
R2444 R2454
0 18
18
1/4
3/4
13 14
C1
TO MAIN SECTION (2/4)
C2
C9
2/4
SA-AK450GCP MAIN CIRCUIT
4/4