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COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10–53
21.DC power supply is absent.
AC power supply
Fuse (power supply
PCB)
Wiring, DC load
Power supply PCB
1
2
3
NO
YES
YES
NO
Is the rated voltage present between J204-1
and J204-3 on the DC power supply PCB?
Is the fuse (FU1, FU2, FU3, FU4, FU5) on
the power supply blown?
Turn off the power switch, and disconnect
the power plug. Disconnect J208, J209, J210
on the power supply PCB. Connect the
power plug, and turn on the power switch. At
this time, is the voltage between the
following terminals normal?
+ – Output voltage
J208-1 J208-2 +24V
J208-3 J208-5 +5VU
J208-4 J208-5 +5VR
J209-4 J209-3 +24V
J210-1 J210-2 +24V
J210-8 J210-2 +5VU
J211-7 J211-1 +24V
J211-5 J211-1 +5VU
See “AC power is absent.”
Remove the cause, and replace
the fuse.
Check the wiring and the
connectors of the DC power
supply line.
Replace the power supply
PCB.
Actions
ChecksStep
Cause
Yes/No