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1S
7. TROUBLESHOOTING
FLOW CHART NO.1 POWER TROUBLESHOOTING (1)
Unplug the AC power cord.
Replug it a few minutes later.
Is the fuse good?
YES
Are AT5.5V voltage line normal?
YES
Are AT45V, AT12V, AT18, AT - 25V
and filament voltage lines normal?
YES
ts "H" level applied at pin (65) of
1€701?
YES
Check system control circuit
(1C701) and cam switch circuit.
See FLOW CHART NO.2 POWER
TROUBLE SHOOTING (2).
NO
NO
Replace fuse.
Check primary circuit.
Check each rectifier circuits and
short-circuit of secondary circuit.
Check peripheral circuit of Q923
and P-FAIL (L) signal line ete.
FLOW CHART NO.2 POWER TROUBLESHOOTING (2)
In case of Fuse (F901) blown out.
Replace F901, Q901 and Q902,
check D901 as a result of check, if
poor, replace at the same time.
Check short-circuit or leak of D921
thru to D927 and secondary circuit.
FLOW CHART NO.3 POWER TROUBLESHOOTING (3)
In case of abnormal noise (sound)
Check D922, D923, 0924, D926,
D927 and R927.
FLOW CHART NO.4 POWER TROUBLESHOOTING (4)
In case of output voltage at low level.
Check the D930, Q921 and Q922.
Replace D930, Q921 and Q922.
YES
Check C901.
Replace IC901.
YES
Check short-circuit or leak of T901.
Replace T901.
YES
Check primary circuit, Q901, Q3902,
C313 thru to C915 and C910.
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