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6. The copy is foggy (overall).
COPYRIGHT
©
1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
10-53
CHAPTER 10 TROUBLESHOOTING
Checks
Perform the Basic Image
Adjustment Procedure. Is the
problem corrected?
Clean the scanning lamp, reflect-
ing plate, side reflecting plate,
mirror, lens, and dust-proofing
glass. Is the problem corrected?
Does the pre-exposure lamp turn
on during copying operation?
Is the developing spacer worn?
Is the developing cylinder worn?
Is the developing cylinder
insulated from the copier GND?
Turn off the power supply, and
disconnect J908. Check the
continuity with the meter between
the developing and copier sides of
J908-2.
Is the reading for ‘No. 105’ in
service mode (primary charging
current) 10 µA or less?
Cause
Scanner
Pre-exposure
lamp, DC
controller PCB
Developing
spacer
Developing
cylinder
Developing
cylinder
Drum cartridge
Composite
power supply
PCB
Step
1
2
3
4
5
6
7
Results
YES
YES
NO
YES
YES
NO
NO
YES
Action
End.
End.
See “The pre-exposure
lamp fails to turn on.”
Replace the developing
assembly.
Replace the developing
assembly.
Check the parts around
the developing cylinder
and the developing
connector.
Replace the drum
cartridge.
Replace the composite
power supply PCB.