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Trouble Shooting Chart
Startpoint symptom:
Dead
Y
Check voltage B5(+15V) on pin 1
(IV
b
of IC351
I
15V
Short circuit on B5 line
IC351 , D354, C364, R360
T
Check voltage B6(+12V) on pin 3
Ov
Short circuit on B6 line
*
IC351, C371, IC181, A101,
of IC351
IC801, IC1103, C101, C114,
4
12V
C117, C180, C190, C733, C801,
v
I C1172
Check voltage B7(+8V) on pin 3 of
IC352
,1
8V
Check waveform on pin 37 of IC101
Yes
v
Check waveform on Q431 -
collector
w
Ov
Shori circuit on B7 line
IC352, IC101 , IC280, R368,
C372, C407, C406, Cl 37, Cl 36,
D215, C283, C282
L1
m
Iv
Horiz.
':
ICIO1 , D214, R408, R409,
X201 , X202
n
1
N
50"
Horiz.
')
Q431 , R431, C431 , C432,
C434, R434, T431
v
Check voltage on both ends of
Ov
*
Check horizontal output circuit
C421
Q432, L431 , C420, R422, DY,
1
C421 , D432, R449
I
5V or more
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