Printed Wiring Board - Power Board - Sony HCD-EP30 Service Manual

Q Q
3 7 6 3 1 5 1 5 0
6-10. PRINTED WIRING BOARD – POWER Board – •
1 2
A
POWER BOARD
+
E
B
MAIN
K A
BOARD
(Page 18)
A
K
A K
+
A K
A K
C
A K
K A
T E K A
L 1 3 9 4 2 2 9 6 5 1 3
D
E
• Semiconductor
Location
Ref. No. Location
D401 D-1
D402 C-1
D403 D-1
D404 C-1
D405 B-2
D406 C-2
D407 B-2
D408 B-2
D409 C-3
D411 C-3
D412 D-3
D413 C-3
D414 D-3
Q401 B-3
w w w
Q402 B-3
Q403 B-3
Q404 B-3
.
ZD401 B-3
See page 15 for Circuit Boards Location.
3 4
AC IN
+ +
B C E
B C E
K
E C B
B C E
A
K
+
A
K A
K A
A K
A K
TR402
POWER
TRANSFORMER
TR401
POWER
TRANSFORMER
x a o
y
i
http://www.xiaoyu163.com
8
• Waveforms
– MAIN Board –
5
1 IC102 w; (XOUT)
139 ns
2 IC604 qf (XO)
231 ns
Q Q
3 7 6 3
u 1 6 3
.
23 23
http://www.xiaoyu163.com
2 4
9 9 8
– CASSETTE Board –
1 Q705 (Collector)
(RECORD (ISS 2) mode)
3.1 Vp-p
47.2 Vp-p
11.8 µ s
2 Q706 (Base) (RECORD mode)
3.2 Vp-p 1.3 Vp-p
12.4 µ s
1 5 1 5 0 8 9 2 4
3 Q706 (Collector, Emitter)
(RECORD mode)
0.8 Vp-p
12.4 µ s
m
c o
HCD-EP30/EP40
2
9 9
– DISPLAY Board –
1 IC601 tl (X2)
4.4 Vp-p
167 ns
9 8 2 9 9