7. TROUBLESHOOTING
FLOW CHART NO.2 POWER
TROUBLESHOOTTNG
(2)
FLOW CHART NO.1 POWER TROUBLESHOOTING (1)
I
No power.
I
Is the fuse good?
NO
I
Replace fuse.
I
I
I
I
YES
NO
Are AT5.5V voltage line normal?
1
YES
Check primary circuit, D921, D925,
D926,
and D927.
+
Are AT46V,
AT1
2V,
AT
-
25V and
NO
Check each rectifier circuits and
filament voltage lines normal?
short-circuit of secondary circuit.
I
)
YES
I
I
Check peripheral circuit of 4923
and
P-FAIL(L)
signal line etc.
Check system control circuit
(IC701)
and cam switch circuit.
In case of Fuse
(FQOl)
blown out.
I
check
D901
asa result of check, if
Check short-circuit or leak of D921
FLOW CHART NO.3 POWER TROUBLESHOOTING (3)
In case of abnormal noise (sound).
I
I
~Ch&cD92i.D923,D924,DQ26,and
/
FLOW CHART NO.4 POWER TROUBLESHOOTING
(4)
In case of output voltage at low level.
I
Check the D930,Q921
and
Q922.
Replace D930,
Q921
and
9922.
Check
ICQOl.
NO
Replace
IC901.
NO
Checkshort-circuit or
leakof
T901.
t
Replace
T901.
1
YES
r--+--l
Check pnmarycrrcurt,
Q901,Q902,
C913 thru to
C915.
CQlO
and D925.
To Next Page
Loading...
