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7. TROUBLESHOOTING
FLOW CHART NO.1 POWER TROUBLESHOOTING (1)
NO
Is the fuse good?
YES
NO
Are AT5.5V voltage line normal?
Are AT46V, AT1 2V, AT - 25V and
NO
filament voltage lines normal?
Check system control circuit
No power.
Replace fuse.
Check primary circuit, D921, D925,
Check each rectifier circuits and
short-circuit of secondary circuit.
Check peripheral circuit of 4923
and P-FAIL(L) signal line etc.
FLOW CHART NO.2 POWER TROUBLESHOOTTNG (2)
In case of Fuse (FQOl) blown out.
check D901 asa result of check, if
FLOW CHART NO.3 POWER TROUBLESHOOTING (3)
In case of abnormal noise (sound).
I
FLOW CHART NO.4 POWER TROUBLESHOOTING (4)
In case of output voltage at low level.
Check the D930,Q921 and Q922.
Check ICQOl.
Check pnmarycrrcurt, Q901,Q902,
C913 thru to C915. CQlO and D925.
I
Check short-circuit or leak of D921
I
I
Replace D930, Q921 and 9922.
NO
Replace IC901.
NO
Replace T901.
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Table of Contents
Troubleshooting
