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ELECTRICAL TROUBLESHOOTING GUIDE -1/10
No 5V_D
or 5V_A .
No 5.2VA.
Is 5.2VA section working?
Is oscillation present at the
Base of Q108?
Replace Q108.
Check L103, C116.
Replace R111.
Replace BD101.
(Bridge rectifier)
Check Fuse(F101).
Is R111 1
Ω
?
Check D105.
Replace Q101, 102.
Is 5.2V applied to IC108
Pin 1?
Is there a DC voltage at the
(+) terminal of BD101?
Check R127, 128.
(SHUTDOWN CKT)
1. Power(SMPS) Circuit
No VF+
Is 5.2VA section working?
Replace D109.
Is oscillation present at the
anode of D109?
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
A.
B.
NO
NO
NO