Philips MC-77/22 Service Manual page 37

CIRCUIT DIAGRAM
1701 D14 2621 A3 2702 E3 2711 D9 2716 H8 2721 D7 2727 D3
1703 A1 2622 A3 2703 E13 2712 I8 2717 D5 2722 H7 2728 E3
1706 A1 2623 A2 2704 F12 2713 D9 2718 E5 2723 D7 2729 E8
1710 F1 2625 C5 2709 E7 2714 H8 2719 F4 2724 H7 2730 H8
1760 A14 2701 D2 2710 G7 2715 D8 2720 F4 2725 D10 2731 E9
1 2 3
EH-B 1703
+MOTOR
11.9V
+MOTOR 2
GND_M 1
A
M
1706
FE-BT-VK-N
STROBE
7
DATA
6
CLK
5
GND_P
P
4
+5V
+5V
3
AD1
2
B
CR_IN
1
TO / FROM
FRONT BOARD
C
D 3749
120R
A
Rch
3750
Lch
E
120R
A
FE-ST-VK-N
REC/PB
1710
GND_A 1
F
Erase 2 A
3
Rch
Common
4
0.0V
5
Lch
7786
J111
2732 A
PB_Lin
G 3781
1u
-C
4M7
6773
0.0V
2786 3780
100p 1M
1N4148 18.7V
A A
+12V A
3762
820R
H
11.6V
P
BC557B
7782
P 11.0V
7783
BC847B
7 8
MT1 MT2
6 3.3V 3770 1.6V 3771
3
P
5 1K5 1K2
2 3.1V
2782
1 4 0.7V
I 3777
7781
4n7
CLNS-2A833 YEZ BC817-25
150R 3776
5703
6K8
2743
ERASE
22n OSCILLATOR
A P
P P
A A P
1 2 3
9-5
2732 G2 2769 E12 2784 I1 2789 E8 2795 G5 3607 A11 3612 B11
2743 I1 2770 F11 2785 I2 2790 G8 2796 G9 3608 B10 3614 C11
2747 D13 2780 I3 2786 G1 2791 E8 2797 G9 3609 A11 3624 A9
2761 F10 2781 I3 2787 G3 2793 F7 2798 E9 3610 B11 3626 A10
2768 G13 2782 I2 2788 D13 2794 G8 2799 F10 3611 A10 3628 A9
4 5 6
P
P
SHIFT REGISTER
8
7
VSS 0.0V
STROBE CR_BIAS
O3
10 Os
DATA
11 5.0V
MOT
O7
CLK Os
9
0.0V
SOL
STR 7610 O5
1 13
HEF4094BT
0.0V
MUTE_OFF
O6
12
D
2
O4
14
0.0V
CR_SEL
CP O0
3 4
REC 5.0V
O1
5
0.0V
BIAS_OFF
O2
6
VDD E0
16 15
2625
P
100n
+5V
AD1
DATA
CR_IN
* 4737 (NAR) CR_SEL
PB_Rin
* *
3723 3717 (AR)
18K 1K2
*
2727 2717
2n2 15n
* 4736 (NAR)
* *
3724 3718 (AR)
18K 1K2
*
2728 2718
* *
REC EQ
2n2 15n
+12V
3794
BC847B
7794
1K
7792
3795
BC847B
BC847B
7793
1K 3792
47K
A A A A
3779
330K BIAS_OFF
6774
1N4148
CR_BIAS
BIAS
6778
LEVEL *
3769
22K
+12V 1N4148
6776
11.7V
* 1N4148
0.0V
3786
P BIAS_OFF
7780
BC847B
22K
0.3V
P P
4 5 6
3630 A9 3710 I8 3719 E4 3724 E3 3737 G13 3744 F11 3762 H2 3771 I3
3678 B8 3711 E7 3720 E4 3733 E13 3738 G12 3745 D12 3764 F9 3772 I3
3680 B9 3712 G7 3721 E4 3734 F13 3739 G13 3746 D11 3768 D13 3774 H3
3686 C11 3717 D5 3722 E4 3735 E13 3740 G14 3749 D2 3769 H5 3775 I3
3709 D8 3718 E5 3723 D3 3736 E13 3743 E12 3750 E2 3770 I2 3776 I2
7 8 9
+MOTOR 7612
PMBT 2907
11.8V
11.9V +MOTOR
11.0V
1.1V
0.7V
3678
7618
BC847B
47K
M
(0.7V)
3680
BC847B
47K
M
REC
MUTE_OFF
3790
22K
2721
REC_Rout
2715 3709
1u
33R
100u A
2713
PB_Rout
A
A
100n
A
2791
2709
1n5
1n
3711
0.56V 0V
100R
A
AN17150A
7720
TAPE PRE-AMP IC
REJECTION
RIPPLE
7.9V
A
3712
100R
2710 2790
1n 1n5
A A
A
2722
REC_Lout
1u
A
A A
7 8 9
9-5
3777 I2 3786 I5 3793 F5 3800 G11 6612 A10 6774 G3 7612 A9
3778 H1 3789 I4 3794 F5 4736 D5 6770 H2 6776 I4 7614 A10
3779 G3 3790 D9 3795 F5 4737 D5 6771 H2 6777 H3 7618 B9
3780 G2 3791 G9 3796 E10 5701 G2 6772 G1 6778 H5 7620 B9
3781 G2 3792 F6 3797 C11 5703 I1 6773 G2 7610 B5 7624 C11
10 11 12
7614
PMBT 2907 sol_supply
(11.8V)
+5V
(11.0V)
(1.1V)
7620
+5V
BC847B
7624
(0.3~1.5V)
(0.8~2.1V)
3686
(0.3~1.5V)
100K
-C
MUTE_OFF
REC
3745
TAPE_L
3746 1K2
TAPE_R
1K2
+12V
A
REC_Rin REC_Lin
REC_Rin
A
+12V
A A A A A
PRE_AMP_VCC
TAPE_R
TAPE_L
0.0V
0.6V
3737
A BC847B
7789
1K
A
3800
0.0V
22K
0.6V
3738
BC847B
7790
1K
REC_Lin
A
** - Provision Part
DC Voltages measured with Fe Recording.
xxV - Voltages during Solenoid On.
* - Variant Parts between AR and NAR versions : please refer to table below;
Item Autoreverse Non-Autoreverse
2717 15n
2718 15n
3717 1K2 Jumper (4737)
3718 1K2 Jumper (4736)
3723 18K
3724 18K
3769 22K
3772 12K
10 11 12
7720 F8 7784 G3 7792 F6
7780 I4 7786 G2 7793 F4
7781 I3 7788 G13 7794 F4
7782 H2 7789 G12
7783 H2 7790 G12
13 14
TO / FROM
A
MECHANISM
FE-ST-VK-N
1760
1
Vcc12V
2
PHOTO
3
GND_M
M
4
MODE
5
sol_supply
6
CR_IN B
7
REC_FWD
8
REC_RVS
C
2
1
TO / FROM
AF BOARD
1701
FE-BT-VK-N
3768 -9.0V
A
D
7 -CMOS
10K
TAPE_R
6
+12V
5
11.9V
TAPE_L
4
2788
3 GND_A
A
3735
22n 22K
2 REC_R
REC_L
3736
REC_L
1
REC_R
22K
E
4
3
A A A
F
MUTING CIRCUIT
MUTE_OFF
+12V
G
0.8V
7788
BC847B
3740
47K
0.0V
A A
H
Open
Open
I
22K
22K
18K
15K
13 14