Printed Wiring Board - Hi Amp Board (Ec78); Schematic Diagram - Hi Amp Board (Ec78) - Sony HCD-EC68 Service Manual

HCD-EC68/EC78
Q Q
3 7 6 3 1 5 1 5 0
7-9.

SCHEMATIC DIAGRAM - HI AMP Board (EC78) -

T E
L 1 3 9 4 2 2 9 6 5 1 3
A
B
C
w w w
D
MAIN
BOARD
CN632
(Page 28)
HCD-EC68/EC78
7-8.

PRINTED WIRING BOARD - HI AMP Board (EC78) -

A
E
MAIN
BOARD
CN632
(Page 27)
B
1 2 3
HI AMP BOARD
Q151,152
OVER LOAD DETECT
D151
MC2838-T112-1
R185
2.2k
0
Q151
2SA2026
R186
2.2k
0
Q152
2SA2026
CN151
D152
6P MA2J1110GLS0
TP151
OUT-L
6
TP152
E
-VH
5
x a o
TP153
y
+VH
4
TP154
OUT-R
3
. i
(1/2)
NC
2
TP155
PA-GND
1
http://www.xiaoyu163.com
1 2
HI AMP BOARD
JW157
JW151
JW154
C170
Q152
CN151
B E
R185 R186
Q151
R183
R184
B
E
C176
D151 C173
C175
R175
JW152 JW155
R181
R177
R179
R180
R176
JW156
R178
R171
C174
1
IC151
Q Q
3 7 6
4 5
IC151
STK433-070
+PRE
1 2 3 4 5 6 7 8
R183 R181
22k 1.2k
0
R179
0.22
2W
C175
0.1
0
C174 C173
0.1
0.1
R182 1.2k
R184
22k
0
R180
0.22
2W
C176
0.1
0
u 1 6 3
∗C169, 170
100 50V (EC78: E2, E3, E51, MX, AR)
.
100 63V (EC78: AEP, RU)
30 30
• See page 23 for Circuit Boards Location. •
3
2 4
8 9 9
R164
C160
C159
R163
C157 D152
R162
C169
R161
C158
R159
R151
R160
JR151
R153 C161
JW153
C151
C166
R172
CN152
C152
R154
R152
C162
R155
R195
R156
C153
C154
C178
C155 C156
R173
R196
12, 13
15
(12, 13)
1-875-496-
3 1 5 1 5 0 8 9 2
6 7
IC151
POWER AMP
9 10 11 12 13 14 15
R171 R196 470
C155
0
100p
C156 100p
R195 470
C153 C154
470p 470p
R155 R156
47k 47k
C151 C152
1 1
50V
50V
R153
R154
22k
22k
C178
R151
0.1
1.8k
C161 C162
m
0.01 0.01
c o
R172 C166
100 4700p
: Uses unleaded solder.
4
2
8 9 9
F
MAIN
BOARD
CN602
(Page 27)
4 9 8 2 9 9
8 9
R173 CN152
1k
5P
TP156
PROTECT
1
F
TP157
AMP-ON
2
TP158
IN-L
3
MAIN
TP159
BOARD
A-GND
4
TP160 (1/2)
IN-R
5 CN602
(Page 28)