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Schaltpläne und Druckplattenabbildungen / Circuit Diagrams and Layout of PCBs
M 37-DC
Schaltpläne und Druckplattenabbildungen / Circuit Diagrams and Layout of PCBs
M 37-DC
GRUNDIG Service
GRUNDIG Service
4 - 25
4 - 26
11.5V
12.5V
Vref
SOURCE-SELECTOR
LOGIC-CONTROL
INPUT
A RIGHT
INPUT
INPUT
INPUT
B RIGHT
C RIGHT
D RIGHT
INPUT
INPUT
INPUT
INPUT
A LEFT
B LEFT
C LEFT
D LEFT
INPUT
MONO
VOLUME1
LOUDN.
LEFT
LEFT
LEFT
TREBLE
BASS
VOLUME1
LOUDN.
RIGHT
RIGHT
TREBLE
BASS
RIGHT
I C
2
VOLUME2
LEFT
VOLUME2
RIGHT
Vcc
Front
Front
Rear
Rear
MUTE
RIPPLE IN
LINEAR OUT R
LINEAR OUT L
INCREDIBLE SURROUND
HEADPHONE AMP.
MUTE
CD STANDBY SWITCH
STBY ON " PLOP KILLER "
FOR HEADPHONE
I2C_CLK
I2C_DATA
TO POWER
HP SOCKET
TO TUNER
TO FRONT
TO CD/3-CDC
TO POWER
-CMOS
SDA
GND-A
GND-A
K_IN_L
K_IN_R
+12V
K_OUT_R
K_OUT_L
TUNER_L
TUNER_R
TO ETF2
DP
DP
DP
TO AUX
TO DPL/FK
TO TAPE MOTOR
(Dia. 3.5mm)
+12A
SUB_OUT
SUB-WOOFER OUT
BUFFER AMP
TO CONNECTOR 1521
-0.7V
4
5
6
1
7
8
9
10
11
12
13
14
15
16
17
2
18
19
20
21
22
3
K
J
N
I
H
G
F
E
D
C
B
A
M
L
K
J
N
I
H
G
F
E
D
C
B
A
M
L
4
5
6
1
7
8
9
10
11
12
13
14
15
16
17
2
18
19
20
21
22
3
a
D
aa
aa
aa
a
a
a
a
a
a
a
a
a
a
a
a
D
D
D
a
a’
a
a
a
D
a
a
a
D
D
a
a
a
a’
a
M
M
a
a
a
a
a
a
a
a
a
a
a
aa
a
a
a
a
a
a
D
aa
aa
aa
a
D
M
a
aa
aa
D
D
D
a
a
D
M
a
a
a
a
a
a
a
a
a
a
a
a
aa
aa
D
aa
aa
aa
aa
a
a
a
aa
aa
aa
a
2n2
2641
47p
2612
47p
2611
470p
2520
470p
2519
1n
2562
1n
2561
100p
2560
100p
2538
100p
2559
100p
2537
22n
2590
680p
2596
680p
2595
3n3
2539
22n
2557
22n
2558
22n
2529
22p
2526
22p
2525
33n
2523
470p
2551
1n8
2535
100n
2591
8n2
2502
5n6
2513
220n
2507
470n
2511
470n
2512
220n
2508
5n6
2514
2581
100n
8n2
2501
470p
2531
470p
2532
100p
2609
100p
2610
100p
2603
33n
2524
1n
2617
22n
2547
4n7
2619
22n
2548
22p
2621
22p
2622
3n3
2540
470p
2552
1n8
2536
100n
2592
1n
2618
22n
2604
220p
2593
220p
2594
100p
2632
10p
2637
1n
2630
470n
2533
470n
2534
100n
2597
470n
2517
470n
2518
10k 3581
10k
3579
220k
3634
220k
3633
150k
3564
150k
3563
100R
3648
100R
3647
3k3
3506
3k3
3505
15k
3507
1k8
3646
15k
3508
4k7
3519
1k8
3645
82k
3510
4k7
3520
4k7 3612
3k9 3611
2k2 3513
1k5
3603
3k3
3577
3k3
3578
47R
3566
47R
3565
220R
3573
220R
3574
3575
2R2
5k6
3595
4k7
3585
1k
3586
5k6
3532
8k2
3560
22k
3528
8k2
3559
22k
3527
22k
3511
22k
3512
4k7
3518
4k7
3516
4k7
3517
4k7 3515
5k6
3504
100R
3502
5k6
3589
820R
3613
820R
3556
820R
3555
8k2
3551
8k2
3643
5k6
3641
8k2
3541
10k
3539
680k
3533
10k
3537
4M7
3584
2k2
3562
2k2
3561
1k
3570
1k
3569
2k7
3580
1k
3582
1k
3583
27k
3557
27k
3558
47R
3568
47R
3567
82k
3509
5k6
3503
100R
3501
8k2
3523
8k2
3524
2k2
3525
2k2
3526
5k6
3546
22k
3530
4k7
3529
10k
3547
2k2
3548
1k8
3632
1k8
3631
3601
82k
3602 82k
22R
3576
2k2
3514
1k
3553
5k6
3549
1k5
3604
8k2
3552
8k2
3644
5k6
3642
220k
3536
8k2
3542
10k
3540
680k
3534
10k
3538
1k
3554
5k6
3550
5k6
3531
220k
3535
5k6
3545
47k
3543
47k
3544
2k2
3655
100R
3658
1M
3907
2k2
3657
1k5
3652
2k2
3654
1k2
3606
1k2
3605
1k
3656
1k
3636
1k
3667
1M
3666
1k
3668
7513 BC847C
BC847C
7505
7503
BC817-40
BC847C
7516
BC847C
7512
BC847C
7517
BC847C
7519
BC847C
7518
BC847C
7520
7511 BC847C
7502
BC817-40
7510
BC847C
BC847C
7508
4u7
2601
1u
2634
2587
4u7
47u
2515
47u
2542
47u
2541
4u7
2575
2550
4u7
2549
4u7
47u
2544
47u
2543
2522
47u
2521
47u
100u
2516
100u
2584
47u
2580
47u
2582
0.22u
2506
0.22u
2505
100u
2583
2602
4u7
4u7
2615
4u7
2616
47u
2620
100u
2635
1u
2636
2588
4u7
0.47u
2504
0.47u
2503
10u
2642
+12M
+12A
+12A
HPREF
VOCAL_FADER
STANDBY
I2C_CLK
I2C_DATA
AMP_ON
PWR_DWN
CD_STBY
MUTE
F2
F1
L
R
AMP_ON
+5.6V
F2
PWR_DWN
REC_R
REC_L
TAPE_R
TAPE_L
+12
CD_L
CD_R
+CD
+12
+12A
+TR1
HPREF
HPREF
HPREF
HPREF
+CD
+12A
REF
REF
REF
CD_R
+12A
TAPE_L
CD_L
I2C_CLK
I2C_DATA
CD_STBY
MUTE
STANDBY
NTC
CLIPPING
-30V
F1
+12A
TAPE_R
NTC
HP_SENSE
HP_SENSE
+12M
+12
+TR1
+TR1
+TR1
+TR1
+12M’
+12M’
+12M
+12A
4506
4574
4576
4577
9578
4527
7
6
5
4
3
2
58
1
9
7
8
6
5
4
3
2
57
1
7
6
5
4
3
2
56
1
2
55
1
7
8
6
5
4
3
2
54
1
4
3
2
52
1
3
2
51
1
10
3
2
71
1
4
1N4002
6510
6511
1N4002
1N4148
6502
1N4148
6504
10R
3635
22R
3637
6501
BZX79C9V1
6503
BZX79C9V1
1522
T
S
MT
YKC21-3415
1
1501
2
3
4
5
6
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1510
47u
2585
50V
10u
2613
50V
10u
2614
1516
8
6
5
7
7501
NJM4556AM
8
6
5
7
7507
NJM4560M
4
2
3
1
7507
NJM4560M
4
2
3
1
7501
NJM4556AM
5502
2u2
5503
2u2
5504
2u2
5501
2u2
7514
BC857B
BC327-40
7515
BC817-40
7504
2
1
9
8
7
6
5
4
3
1508
25
26
27
28
29
30
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
31
32
TEA6321
7553
TO AF3
AUX
L
R
AUX SOCKET
a
a
a
a
a
a
a
470p
2546
470p
2545
22n
2589
82k
3571
82k
3572
1k
3593
1k
3594
2574
4u7
2573
4u7
3
2
1
1505
4
3
2
1
1507
T
MUTE
TO CONNECTOR 71
aa
+12A
1
1521
2
3
4
6V
6V
6V
6V
6V
6V
6V
5V
+5.6V
10V
-30V
+5.6V
+5.6V
+5.4V
+4.7V
+4.7V
+4.0V
9.3V
1.1V
0.6V
0.6V
4.8V
4.8V
9.3V
1.1V
0.6V
0.6V
3V
3.6V
8.5V
+5.6V
11.3V
11.5V
5.5V
0.3V
0.9V
-0.4V
0V
4.2V
4.2V
4.2V
4.2V
+8.5V
+11.5V
+9.1V
4.2V
4.2V
4.2V
4.2V
8.5V
4.2V
4.2V
4.2V
-8.2V
4.5V
-25V
-25V
+5.6V
-30V
-30V
NF-Teil / AF Part
Spannungen / Voltages
+CD
5V
CD_STBY
0V (CD stop)
2.3V (CD play)
REF
4.2V
HPREF
6V
HP_SENSE
4.5V
+12, +12A, +12M
12V
to 1124 Tuner
page 4 - 4
to 1873 CDC Interface
page 4 - 20
to 1703 Tape Deck
page 4 - 15
to 1701 Tape Deck
page 4 - 14
to 1401 Front
page 4 - 7
to 1211 Amp
page 4 - 35
to 1215 Amp
page 4 - 35
3592
N 4
3593
B 1
3594
B 1
3595
C21
3596
C20
3597
M 4
3598
N 4
3599
M 4
3600
N 4
3601
B 4
3602
C 3
3603
D16
3604
G16
3605
A 9
3606
I 9
3611
A18
3612
A18
3613
A17
3614
L 4
3615
K 4
3616
L 5
3617
K 5
3631
H21
3632
H20
3633
H21
3634
H20
3635
E18
3636
L15
3637
J16
3641
D14
3642
G14
3643
D14
3644
G14
3645
A 8
3646
I 8
3647
C17
3648
E17
3652
K14
3654
L13
3655
L17
3656
K15
3657
J16
3658
K16
3661
A 7
3662
I 7
3663
G 4
3664
H 5
3666
K15
3667
J15
3668
L15
3671
M19
3672
M19
3673
M19
3674
M18
3675
M18
3676
M18
3677
M18
3678
N18
3679
N18
3680
N19
3681
N19
3682
N19
3907
K17
4501
A 8
4502
H 8
4505
J19
4506
L 8
4507
K19
4527
L 8
4529
A19
4543
B 6
4544
G 6
4545
B 5
4546
I 8
4563
L18
4574
K 8
4576
M 5
4577
N 5
4593
J16
4594
J17
5501
E18
5502
D21
5503
F20
5504
F20
6501
I 3
6502
D18
6503
H10
6504
I19
6510
K 8
6511
K 9
7501
C18
7501
F18
7502
K14
7503
D19
7504
E19
7505
G10
7507
B 6
7507
H 7
7508
K10
7510
J17
7511
K16
7512
C20
7513
D21
7514
C20
7515
A20
7516
B20
7517
C14
7518
F14
7519
D15
7520
G15
7553
C12
9513
J12
9514
J11
9578
K 3
9590
D18
9591
D21
1501
D 2
1502
I 1
1505
B 3
1507
B 1
1508
E21
1510
K 2
1512
A 3
1513
L 1
1516
E21
1520
G 4
1521
K18
1522
J13
2501
A 8
2502
G 8
2503
B 8
2504
F 8
2505
B 8
2506
F 8
2507
B 9
2508
G 9
2511
B 9
2512
G 9
2513
B10
2514
G 9
2515
A18
2516
A17
2517
B 9
2518
H 9
2519
D16
2520
G16
2521
I 4
2522
I 5
2523
F13
2524
E12
2525
A 7
2526
G 7
2527
D17
2528
E17
2529
E18
2531
C17
2532
F17
2533
D13
2534
H13
2535
D14
2536
H14
2537
C 5
2538
G 5
2539
C14
2540
F14
2541
C16
2542
E16
2543
C19
2544
F19
2545
B 2
2546
B 2
2547
D21
2548
E21
2549
C 3
2550
C 3
2551
C14
2552
G14
2553
H19
2554
H19
2557
E20
2558
D20
2559
B 6
2560
G 6
2561
B10
2562
G10
2573
B 2
2574
B 2
2575
D20
2580
F 6
2581
C 7
2582
F 7
2583
H10
2584
H11
2585
I 4
2587
C 4
2588
F 4
2589
B 1
2590
F 7
2591
B14
2592
F14
2593
C15
2594
G15
2595
B 7
2596
H 7
2597
C 6
2601
C 6
2602
F 5
2603
G18
2604
K13
2605
K 4
2606
L 4
2609
D19
2610
E19
2611
C18
2612
F18
2613
M 4
2614
N 4
2615
C16
2616
H16
2617
E15
2618
H15
2619
H11
2620
E18
2621
B 4
2622
F 7
2623
H10
2624
L18
2625
N 3
2630
K17
2632
L14
2634
K17
2635
J14
2636
K16
2637
J17
2641
H10
2642
K14
3501
C 3
3502
F 3
3503
C 3
3504
F 4
3505
C 4
3506
F 4
3507
B 7
3508
H 7
3509
A 7
3510
H 7
3511
B 8
3512
G 8
3513
B 9
3514
G 9
3515
B 9
3516
H 9
3517
B 9
3518
H 9
3519
B 6
3520
G 5
3521
B 6
3522
H 8
3523
J 4
3524
J 5
3525
K 4
3526
K 5
3527
B 8
3528
G 8
3529
G18
3530
G18
3531
F12
3532
E13
3533
C13
3534
F13
3535
C13
3536
G13
3537
B14
3538
E14
3539
C14
3540
G14
3541
C15
3542
F15
3543
C15
3544
F15
3545
A20
3546
B20
3547
B20
3548
B21
3549
D14
3550
H14
3551
E15
3552
H15
3553
B15
3554
F15
3555
B16
3556
H16
3557
C17
3558
F17
3559
C 4
3560
G 5
3561
D17
3562
E17
3563
B18
3564
F18
3565
C18
3566
F18
3567
C19
3568
F19
3569
D19
3570
E19
3571
B 2
3572
B 2
3573
A11
3574
G10
3575
A19
3576
K 10
3577
B12
3578
F12
3579
D22
3580
G10
3581
D21
3582
H11
3583
H12
3584
C18
3585
D20
3586
C21
3587
K 3
3588
K 3
3589
I 4
3591
M 4
to 1502 DPL
page 4 - 29
0051
A 3
0052
C 2
0053
D 2
0054
F 2
0055
H 2
0056
I 2
0057
J21
0058
L21
0059
M21
0060
A 2
0061
F 1
0062
E 1
0065
H 3
0070
H 2
0071
J18