Table of Contents
5. TROUBLESHOOTING
A. Power Supply Check
Start
Check
fuse open
Is
Q901 VDS
waveform normally?
Is 8V
in spec?
Is 15V
in spec?
Is B+voltage
correct?
Combine with
monitor check operating
frequency?
OK
Stop
Yes
Check and replace EMI Filter
and Q901, I/P Rectifer
Check and replace Q902,
No
Q903, U901, D908, R908
No
Check D940, C940, Q940,
Q941, VR901
No
Check D941, C944, Q942, Q943
No
Check D944, D945, C949, Q504,
R538, Q505
No
Check and replace ZD903, R918,
R919, R916, D911, C920
28
and filter
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