Printed Wiring Board - Low Amp Board; Schematic Diagram - Low Amp Board - Sony HCD-EC68 Service Manual

7-10. PRINTED WIRING BOARD - LOW AMP Board -

1
LOW AMP BOARD
A
G
CN104
MAIN
BOARD
CN633
(Page 27)
B

7-11. SCHEMATIC DIAGRAM - LOW AMP Board -

1 2
LOW AMP BOARD
A
MC2838-T112-1
B
C
CN104
5P
OUT-L
5
G
-VH
4
+VH
D 3
MAIN
BOARD OUT-R
2
(1/2)
PA-GND
CN633 1
(Page 28)
HCD-EC68/EC78
• See page 23 for Circuit Boards Location.
2
JW132 JW131
JW133
C120
Q102
R135 R136
B
Q101
E
R133
R134
B
E
D101
C123
C126
C125
R125
JW136
R131 JW135
R127
R129 R130
JW134
R126
R128
R142
C124
1
IC101
3 4
IC101
STK433-060 (EC68)
STK433-070 (EC78)
1 2 3
Q101,102
OVER LOAD DETECT
R133 R131
D101
22k 1.2k
R135
2.2k
0 0
R129
0.22
2W
C125
Q101
0.1
2SA2026 0
C124 C123
0.1 0.1
R132 1.2k
R134
22k
R136
2.2k 0 0
R130
0.22
2W
C126
Q102
0.1
2SA2026 0
D103
MA2J1110GLS0
TP105
TP104 ∗C119, 120
100 50V
TP103
(EC68/EC78: E2, E3, E51, MX, AR)
100 63V
TP102
(EC78: AEP, RU)
TP101
• : Uses unleaded solder.
3 4
CN102
D103
C109
R113
C110
C108
C107
R111 R112
C119
R114
R109
R110
R103
JW137
JR132
R105
R122
R101
C102
C101
C116
R104
R102
R107
R106
C103
R108
C104
R145
C128
C105
C106
R123
R146
15
1-875-495-
5 6
+PRE
4 5 6 7 8 9 10 11 12 13 14 15
R142
R146
C105
0
100p
C106 100p
R145 470
R122
C116
100
4700p
31 31
H
MAIN
BOARD
CN603
(Page 27)
12, 13
(12, 13)
7 8 9
IC101
POWER AMP
470
C103 C104
470p 470p
R107 R108
47k 47k
C101 C102
1 1
50V 50V
∗R105, 106
R105 R106
4.7k (EC68)
∗ ∗
22k (EC78)
C128
0.1
∗R103, 104
R103 R104 1.8k (EC78)
∗
∗
3.3k (EC68)
R123 CN102
1k 5P
R101
TP111
0
IN-R
5
TP110
A-GND
4
TP109
IN-L
3
TP108
AMP-ON
2
TP107
PROTECT
1
HCD-EC68/EC78
H
MAIN
BOARD
(1/2)
CN603
(Page 28)