19.2. (B) Main Circuit
TO
DECK CIRCUIT
(CN1305)
IN SCHEMATIC
DIAGRAM-10
A
B
C
D
E
F
G
H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
: +B SIGNAL LINE
MAIN CIRCUIT
SCHEMATIC DIAGRAM - 2
SA-
AK750PL
MAIN CIRCUIT
1/4
2/4
3/4
4/4
TO MAIN SECTION (2/4)
TO MAIN SECTION (3/4)
POST-VM-L
VCC
R-OUT
POST-VM-R
T-OUT-R
BASS-R2
BASS-R1
[42] L-OUT
[41] NC
[40] DATA
[39] CLK
[1] IN-L1
[2] IN-R1
[3] IN-L2
[12] IN-R6
[13] GND
[14] REF-IN
[32] MID-R2
[31] MID-R1
[30] TRE-R
[29] NC
T-OUT-L
BASS-L2
BASS-L1
MID-L2
MID-L1
TRE-L
SUR2
SUR1
PRE-VIN-L
REC-L
GV_OUT-L
OP-OUT
OP-IN
NC
HB-LPF-OUT
HB-LPF-IN
HB-ATT-OUT
HB-ATT-IN
HARMOUT
HARMIN
HB-FLT-OUT
HB-MIX-OUT
HB-MIX
PRE-VIN-R
REC-R
GV_OUT-R
REF-OUT
IN-R2
IN-L3
IN-R3
IN-L4
IN-R4
IN-L5
IN-R5
IN-L6
IC2803
C1BB00001121
AUDIO SOUND PROCESSOR
IC2803
53
51 50
52
55
56
54
41
39
37
36
38
40
42
46
44
45
48
49
47
43
34
32
33
35
24
21 22
20
23
27 28
25 26
30
31
29
16 17
15
19
18
13
4
3
6
5
1
2
9
7
8
10
12
11
14
C1
C2
C3
C4
C5
C6
C7
C8
C9
C18
C19
C21
C23
C24
C25
C26
C27
C28
C29
C20
C22
PL
R
L
MOTOR_H
MO_GND
DECK_AD2
PB_L
PB_R
A_GND
A_GND
REC_IN_L
REC_IN_R
REC_H
BP
DMT
DVREF
VREF-GND
DGND
+5V
PHOTO
DECK_AD1
+9V
MOTOR 9V
R2145
C2702
C2706
R2705
C2705
R2347
R2315
C2315
C2415
R2249
R2149
R2248
R2247
D2241
D2241
R2704
R2245
C2704
C2412
C2312
R2703
C2703
R2706
C2413R2415
C2414
C2314
C2313
Q2142
Q2242
C2245
R2246
R2146
R2345
R2445
C2444
C2344
R2346
Q2341
R2357
R2447
R2446
R2457
Q2441
C2441
R2444
R2341
18
R2352
18
R2353
0
R2354
18
R2441
18
R2452
18
R2453
0
R2443
18
R2454
18
R2343
18
R2344
C2341
R2455
C2302
C2195
R2195
R2196
C2275
C2509
C2271
R2507
C2507
QR3105,QR3106
R2111
SWITCH
R2212
R2112
R2211
R2204
C2182
C2181
C2175
R2183
R2181
C2183
R2281
D2191
D2191
C2281
C2191
R2182
C2581
C2582
C2282
R2282
R2501
C2503
C2283
R2283
R2503
C2132
C2232
C2122
C2222
C2112
1u
1u
1u
1u
1u
1u
1u
1u
1u
1u
C2212
C2252
C2152
R2104
C2213
C2113
R2102
R2202
IC2872
IC2872
D2871
GND
VCC
OUT
D2871-D2872
D2872
R2505
R2502
R2504
C2301
C2194
R2193
R2194
C2173
C2174
R2173
C2171
R2172
C2172
C2192
C2193
D2503
R2674
VOLTAGE REGULATOR
CN2803
R2103
R2672
C2501
R2203
C2311
C2411
R2412
R2312 R2355
270K
C2342
1u
R2508
R2510
R2271
R2511
C2585
D2583
C2583
R2584
R2586
R2587
R2585
C2584
C2588
C2273
C2274
C2402
C2401
C2272
R2273
R2509
C2511
R2512
C2701
R2411
C2442
R2413
Q2411
R2313
R2311
Q2311
R2701
R2702
C2242
C2142
1K
16V100
1u
3.3k
1u
1
56K
50V22
50V22
3.3K
3.3K
6.8k
100k
220k
1K
470P
1u
1u
220K
470P
3.3K
47P 56K
10P
10P
47P
10
1K
1K
15k
15k
0.47u
0.47u
3.3k
100k
1
3.3k
100k
1000P
0
0
1000P
270k
0
0.47u
10k
10k
3300P
0.15
100k
16V0.22u
2.2K
3.3K
3.3K
2.2K
27K
1
0
1
3300P
1k
680
0.22u
680
1u
50V4.7
16V100
16V100
1u
0
330k
1u
0.047u
100k
2.7k
27K
6800P
6800P
3.3K
3.3K
0
82k
100
1
0.1
4.7k
100k
0.01u
0.01u
4.7K
0.1u
8.2K
0.068u
0.1u
1u
47k
2.2k
10k
1u
2.2k
1u
1u
10k
10k
1k
220
6.8k
2.2k
220p
16V100
330k
1.2k
1.2k
330k
220p
0.1u
0.01u
0.01u
1
0.22u
0.082
4.7k
560
22u
100k
0.01u
470
1u
100k
100k
470
1k
1k
+15V
MUTE_A
AGND
A_GND
PB_R
PB_L
REC_IN_L
REC_L
REC_R
REF_R
REF_L
+15V
REC_IN_L
+9V
DECK_AD2
P_GND
MTR[58]
AGND
PL
DECK_AD1
REC_IN_R
DMT A_GND
DVREF+
U_GND
REC[59]
REC_IN_R
REC_L
REC_R
+3.3V
+5V
PHOTO
LM_1
ASP_CLK
+3.3V
ASP_DA
+15V
HP_R
HP_L
-9V
A_GND
B0ACCK000005
KRC101STA
B0ACCK000005
C0CBAHG00011
B0EAKM000117
B0ADCC000002
B0BC9R000008
50V33
7
9
10
15
18
19
16
17
12
11
14
13
8
4
1
3
2
6
5
21
20
6
7
5
8
2
4
3
1
3
1
2
2
1
3
Q2501
B1ABCF000176
LEVEL METER
CONTROL SWITCH
Q2311,Q2411
B1ABGC000005
MUTING SWITCH
Q2511
B1GDCFJJ0047
MUTING CONTROL
IC2804
C0AABB000125
OP AMP
IC2804
Q2142,Q2242
B1ABCF000176
AGC CONTROL SWITCH
Q2341,Q2441
B1ABGC000005
HEADPHONE MUTING
: CD SIGNAL
: AUX SIGNAL LINE
R2301
15K
R2401
15K
MIC_MIX
MIC
R2161
10K
16V1u
C2263
MIC_MIX
MIC
: TAPE PLAYBACK SIGNAL LINE
: FM/AM SIGNAL LINE
: MAIN SIGNAL LINE
: TAPE RECORD SIGNAL LINE
: MIC SIGNAL LINE
R2163
56K
W581
0
W619
0
W582
0
W579
0
W580
0
W575
0
W661
0
W656
0
W592
0
W675
0
W667
0
W677
0
C3720
0
C3721
0
W596
0
W671
0
W641
0
W678
0
W670
0
W669
0
W651
0
W583
0
W597
0
W588
0
W600
0
W584
0
W589
0
W591
0
W590
0
W674
0
SA-AK750PL
68
Summary of Contents for SA-AK750PL
Page 8: ...8 SA AK750PL ...
Page 11: ...6 Accessories Remote Control FM Antenna Wire AC Cord AM Loop Antenna 11 SA AK750PL ...
Page 13: ...13 SA AK750PL ...
Page 15: ...With reference to page 15 of the operating instruction manual 15 SA AK750PL ...
Page 16: ...With reference to page 16 of the operating instruction manual 16 SA AK750PL ...
Page 27: ...10 3 Main Parts Location 27 SA AK750PL ...
Page 39: ...10 17 1 Replacement of Pinch Roller and Head Block 39 SA AK750PL ...
Page 40: ...10 17 2 Replacement of Motor Capstan Belt A Capstan Belt B and Winding Belt 40 SA AK750PL ...
Page 46: ...12 4 Checking and Repairing of Power P C B 46 SA AK750PL ...
Page 48: ...48 SA AK750PL ...
Page 52: ...15 3 Power P C B Transformer P C B 15 4 Panel P C B 52 SA AK750PL ...
Page 53: ...15 5 Main P C B 53 SA AK750PL ...
Page 54: ...15 6 Deck P C B 15 7 Waveform Chart 54 SA AK750PL ...
Page 56: ...56 SA AK750PL ...
Page 64: ...SA AK750PL 64 ...
Page 66: ...66 SA AK750PL ...
Page 86: ...SA AK750PL 86 ...
Page 91: ...23 Exploded Views 23 1 Cabinet Parts Location SA AK750PL 91 ...
Page 92: ...SA AK750PL 92 ...
Page 93: ...23 2 Deck Mechanism Parts Location RAA4403 S SA AK750PL 93 ...
Page 94: ...23 3 Packaging SA AK750PL 94 ...