The Copy Is Foggy. (Overall) - Canon NP7160 Service Manual

CHAPTER 10 TROUBLESHOOTING

6. The copy is foggy. (overall)

Cause Step
Scanner
Pre-exposure lamp
(LA2),
DC controller PCB
Developing roll
Developing cylinder
Scanner lamp (LA1)
High-voltage power
supply PCB
Lamp regulator PCB
DC controller PCB
10–32
COPYRIGHT © 1998 CANON INC.
Checks
1 Perform the Image Adjustment Basic
Procedure. Is the problem corrected?
2 Clean the scanning lamp, reflecting
plate, side reflecting plate, mirror,
lens, and dust-proofing glass. Is the
problem corrected?
3 Does the pre-exposure lamp remain
on during copying?
4 Are the developing rolls worn?
5 Is the developing cylinder worn?
6 Replace the scanning lamp. Is the
problem corrected?
7 Replace the high-voltage power
supply PCB. Is the problem
corrected?
8 Replace the lamp regulator PCB. Is
the problem corrected?
Yes/No
YES
YES
NO
YES
YES
YES
YES
YES
NO
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Actions
End.
End.
1. Replace the pre-exposure lamp.
2. Replace the DC controller PCB.
Replace the developing rolls.
Replace the developing cylinder.
End.
End.
End.
Replace the DC controller PCB.