Circuit Diagram - Philips MC-M250 Service Manual

CIRCUIT DIAGRAM - ETF8 SD
1 2 3
EH-B 1703
+MOTOR
11.9V
+MOTOR
2
GND_M
1
A
M
FE-BT-VK-N 1706
STROBE
STROBE
7
DATA
DATA
6
CLK
CLK
5
GND_P
P
4
+5V
+5V
3
B AD1
2
CR_IN
1
TO / FROM
FRONT BOARD
C
D
2749
1u
A
Rch
Lch 2750
E
1u
A
FE-ST-VK-N
REC/PB
1710
F GND_A 1
Erase 2 A
3
Rch
4 Common
0.0V
5
Lch
7786
J111
2732 A
G PB_Lin
1K2 3781
-C
4M7 3779
6773
0.0V
2786 3780 330K
6774
100p 1M
1N4148 18.7V
1N4148
A
A
+12V A
3762
820R
H
11.6V
BC557B P
7782
11.0V
P 7783
BC847B
7 8
MT1 MT2
3770 3771
6 3.3V 1.6V
3
P
1K5 1K2
5
2 3.1V
2782
I 1 4 0.7V
P
3777
7781
4n7
CLNS-2A833 YEZ BC817-25
150R
3776
5703
0.3V
6K8
2743
ERASE
22n OSCILLATOR
A P
A A P P P
1 2 3
10 - 1
4 5 6
P
P
SHIFT REGISTER
8
7
VSS 0.0V
CR_BIAS
O3
Os'
10
11 5.0V
MOT
O7
9 Os
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
5.0V
REC
O1
5
0.0V
BIAS_OFF
O2
6
VDD E0
16 15
2625
P
100n
+5V
AD1
DATA
CR_IN
CR_SEL
PB_Rin
3723 3717
12K 1K2
2727 2717
3n3 15n
3724 3718
12K 1K2
2728 2718
REC EQ
3n3 15n *
+12V
3794
BC847B
7794
1K
7792
3795
BC847B BC847B
7793
1K 3792
47K
A A A A
BIAS_OFF
CR_BIAS
REC_Lout
BIAS
6778
LEVEL
3769
10K
+12V 1N4148
6776
11.7V
1N4148
0.0V 3786
7780 BIAS_OFF
BC847B
22K
P P
4 5 6
7 8 9 10
+MOTOR 7612
BC807-25
11.8V
11.9V +MOTOR
7614
BC807-25
11.0V
(11.0V )
1.1V
0.7V
3678
7618
BC847B
47K
M
(1.1V)
(0.7V)
3680
7620
BC847B
47K
M
REC
MUTE_OFF
3790
22K
2721
REC_Rout
2715
1u 3709
33R
100u A
2713
PB_Rout
A
A
100n
A
REC_Rin
2791
2709
1n5
1n
A
3711
100R
+12V
A
AN17150A
PRE_AMP_VCC
7720
TAPE PRE-AMP IC
REJECTION
RIPPLE
A
3712
100R
2790
2710
1n 1n5
A A
A
2722
1u
A
A A
7 8 9 10
10 - 1
11 12 13
sol_supply (11.8V)
+5V
M
+5V
BC847B
7624
(0.3~1.5V )
(0.8~2.1V )
3686
(0.3~1.5V)
100K
-C
MUTE_OFF
REC A
3745
TAPE_L
3746 1K2
TAPE_R
1K2
11.9V
+12V
2788
*
A
22n 3735
REC_Lin
3736
REC_Rin
A A A A A A A A
TAPE_R
TAPE_L
0.0V
0.6V +12V
3737
A BC847B
7789
1K
A
3800
0.0V
22K 0.6V
0.8V
3738
BC847B
7790
1K
REC_Lin
A A
DC Voltages measured with Fe Recording.
(xxV) Voltages during Solenoid On.
: Provision part.
*
Note : Some values may varies, see respective
parts list for correct value.
3139 118 54890...for 90140...3455 pt2 dd wk0125
11 12 13
14 1701 D14 3768 D13
1703 A1 3769 H5
1706 A1 3770 I2
1710 F1 3771 I3
1760 A14 3772 I3
2621 A3 3774 H3
2622 A3 3775 I3
2623 A2 3776 I2
2625 C5 3777 I2
TO / FROM
A 2701 D2 3778 H1
2702 E3 3779 G3
MECHANISM
2703 E13 3780 G2
FE-ST-VK-N
2704 F12 3781 G2
1760
2709 E7 3786 I5
1
Vcc12V 2710 G7 3789 I4
2
2711 D9 3790 D9
PHOTO
2712 I8 3791 G9
3
GND_M
2713 D9 3792 F6
4
2714 I8 3793 F5
MODE
2715 D8 3794 F5
5
sol_supply
2716 H8 3795 F5
6 B
2717 D5 3796 E10
CR_IN
7 2718 E5 3797 C11
REC_FWD
2719 F4 3800 G11
8
2720 F4 5701 G2
REC_RVS
2721 D7 5703 I1
2722 H7 6612 A10
2723 D7 6770 H2
2724 H7 6771 H2
2725 D10 6772 H1
2727 D3 6773 G2
C 2728 E3 6774 G3
2729 E8 6776 I4
2730 H8 6777 H3
2
2731 E9 6778 H5
2732 G2 7610 B5
1 2743 I1 7612 A9
TO / FROM
2747 D13 7614 A10
AF BOARD
2749 D2 7618 B9
2750 E2 7620 B9
1701
FE-BT-VK-N 2761 F10 7624 C11
2768 H13 7720 F8
3768 -9.0V
D
7 -CMOS 2769 E12 7780 I4
10K
2770 F11 7781 I3
TAPE_R
6
2780 I3 7782 H2
+12V
5
2781 I3 7783 I2
2782 I2 7784 G3
4 TAPE_L
2784 I1 7786 G2
3 GND_A
2785 I2 7788 G13
A
22K
2786 G1 7789 G12
REC_R
2
REC_L
2787 H3 7790 G12
1 REC_L
2788 E13 7792 F6
REC_R
22K
E
2789 E8 7793 F4
2790 G8 7794 F4
2791 E8
2793 F7
4
2794 G8
2795 G5
3
2796 G9
2797 G9
2798 E9
2799 F10
3607 A11
F
3608 B10
MUTING CIRCUIT
3609 A11
3610 B11
MUTE_OFF 3611 A10
3612 B11
3614 C11
3624 A9
3626 A10
3628 A9
3630 A9
G
3678 B8
3680 B9
3686 C11
7788
3709 D8
BC847B
3710 I8
3740
3711 E7
47K 3712 G7
0.0V
3717 D5
3718 E5
A
3719 E4
H 3720 E5
3721 E4
3722 E4
3723 D3
3724 E3
3733 E13
3734 F13
3735 E13
3736 E13
3737 G13
3738 G12
I
3739 G13
3740 G14
3743 E12
3744 F11
3745 D12
3746 D11
3762 H2
3764 F10
14