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21. The copy is blank.
22. The copy is solid black.
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-62
CHAPTER 10 TROUBLESHOOTING
Checks
Is the drum cartridge securely
inserted?
Is the drum cartridge rotating
during copying operation?
Is the transfer charging roller
securely inserted?
Is electrical leakage noted on
the transfer charging roller?
Is the reading in ‘No. 105’ of
service mode (primary charg-
ing current) 10 µA or less?
Cause
Drum cartridge
Drum drive
assembly
Transfer charg-
ing assembly
Composite
power supply
PCB
Step
1
2
3
4
5
Results
NO
NO
NO
YES
YES
Action
Insert the drum
cartridge.
1. Check if the
photosensitive drum
rotates smoothly.
2. Check the drum drive
assembly.
Re-insert the transfer
roller.
Check the transfer
charging roller.
Replace the composite
power supply PCB.
Checks
Does the scanning lamp remain
on during copying operation?
Does the pre-exposure lamp turn
on during copying operation?
Is the reading in ‘No. 105’ of
service mode (primary charging
current) 10 µA or less?
Cause
Composite
power supply
PCB
Step
1
2
3
Results
NO
NO
YES
Action
Make checks according
to the descriptions under
“The scanning lamp fails
to turn on.”
Make checks according
to the descriptions under
“The pre-exposure lamp
fails to turn on.”
Replace the composite
power supply PCB.