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CHAPTER 10 TROUBLESHOOTING
COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
10–32
6. The copy is foggy. (overall)
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
1
2
3
4
5
6
7
8
Perform the Image Adjustment Basic
Procedure. Is the problem corrected?
Clean the scanning lamp, reflecting
plate, side reflecting plate, mirror,
lens, and dust-proofing glass. Is the
problem corrected?
Does the pre-exposure lamp remain
on during copying?
Are the developing rolls worn?
Is the developing cylinder worn?
Replace the scanning lamp. Is the
problem corrected?
Replace the high-voltage power
supply PCB. Is the problem
corrected?
Replace the lamp regulator PCB. Is
the problem corrected?
Checks ActionsCause
YES
YES
NO
YES
YES
YES
YES
YES
NO
Yes/NoStep
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.