Schematic Diagram - Low-Amp Board (Ec77/Gx99) - Sony HCD-EC55 Service Manual
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HCD-EC55/EC77/GX99
Ver. 1.2
7-16. SCHEMATIC DIAGRAM — LOW-AMP BOARD (EC77/GX99) —
1
2
EC77/GX99
A
B
C
D
E
F
G
OUT-L
-VH
+VH
OUT-R
D
PA-GND
PROTECT
MAIN BOARD(2/2)
AMP-ON
CN603
H
IN-L
(Page 37)
A-GND
IN-R
I
HCD-EC55/EC77/GX99
• See page 50 for IC Block diagram.
3
4
5
LOW-AMP BOARD
R159
R155
10k
220
R167
2.2k
0
0
R161
10k
C151
Q151
4700p
R165
2SA2026
0
10k
OVER LOARD
DET-L
R160
R156
10k
220
R152
0.22
R168
2W
2.2k
0
0
Q152
C152
R162
2SA2026
0
4700p
10k
OVER LOARD
D152
DET-R
MA111-TX
R166
10k
CN101
10P
1
2
3
4
5
6
7
8
9
10
6
7
IC101
IC102
POWER AMP
POWER AMP
1
2
3
4
5
6
7
8
9
10
11
R151
0.22
2W
R121
R119
220
220
R122
R120
220
220
C105
100p
C113
C111
*
*
*
C111,C113
100uF/ 50V : EC77 : AEP,RU,E2,E3,E51,MX
100uF/ 63V : EC77 : US,CND/GX99
R107
1k
D121
R123
R124
MAZ8051GMLS0
47k
47k
C118
R125
5
C107
100k
4700p
47
5.4
25V
Q101
2SA1235TP-1EF
AMP
0
PROTECT-2
R126
R127
4.7k
10k
5.5
0
Q102
C116
2SC3052EF-T1-LEF
4700p
AMP
PROTECT-1
C115
R128
0.01
10k
EXCEPT
AEP,RU
JW120
5
44
44
8
9
10
*
IC101
IC B/D
IC101
*
STK433-070 EC77 : EXCEPT US,CND
IC102
*
*
IC102
STK433-090-E EC77 : US,CND/GX99
12
13
14
15
*
R101,R102
EC77 : US,CND/GX99
1.5K
EC77 : E2,E3,E51,MX
1.8K
EC77 : AEP,RU
2.2K
R103,R104
*
EC77 : AEP,RU
12K
EC77 : E2,E3,E51,MX
15K
C106
100p
C103
C104
470p
470p
R105
R106
R111
C109
R108
R112
C110
47k
47k
47k
3p
1k
47k
3p
C101
C102
1
1
50V
50V
R103
R104
R109
R110
*
*
0
0
R101
R10 2
C108
*
*
47
25V
C119
C120
0
0
AEP,RU
R130
100
11
12
C15 3
0.1
R129
1k
No mark : CD STOP
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