Table of Contents
TROUBLE SHOOTING
(1) TROUBLE SHOOTING for POWER CIRCUIT
No raster and no power (How to check LED's Diagnosis)
No
Raster
Is Voltage
at D949(K) 5V?
YES
Is click sound
of Relay heard?
YES
Is Voltage at
D945（K）
+115V
NO
Has Fuse F903
blown?
YES
Check
I902,T902
I906 etc.
NO
Is Voltage
at pin(6) of PDS2
NO
3V or more?
YES
Check
E947,Q777
YES
QH01,Q701
I907,I908
1.Turn OFF
the power SW.
2.Wait for 3 seconds.
3.Turn ON again after
NO
several seconds, and
observe green LEDs
carefully.
Check
Q980,Q981,
etc
Check
PDT2 pin(6)
-H out,
PDT2 pin(10
)
-DEF 10.5V
etc.
Check
T702, R748,
R730，etc
.
Check
F901,I901,I904,
F
902,D901,T901
Check
Ucom（I002）
NO
Power control
Check
Q944，
S903
Is Green LED
turned OFF after
several seconds?
YES
Does raster
appear with (8) and (11)
NO
of PDT2 shorted?
YES
Is base Voltage
NO
of Q709 normal?
YES
Are Voltages
At both ends of T702
NO
(primary side)
normal?
YES
Check
Q777, QH01,
T701, TH01
etc.
15
NO
Check
E941,E943,E944
D954,D943,D941
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