Troubleshooting Image Faults; The Copy Is Too Light; Troubleshooting - Canon NP7160 Service Manual

C. Troubleshooting Image Faults
1. The copy is too light. (halftone area only)
Cause Step
Scanner
Developing
assembly
Developing
assembly
Lamp regulator PCB
DC controller PCB
COPYRIGHT © 1998 CANON INC.
Checks
1 Perform the Image Adjustment Basic
Procedure. Is the problem corrected?
2 Clean the mirror, lens, and dust-
proofing glass. Is the problem
corrected?
3 Are the rollers of the developing
assembly in firm contact with the
drum during copying operation?
4 Is the coating of toner on the
developing cylinder even?
5 Replace the lamp regulator PCB. Is
the problem corrected?
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Yes/No Actions
YES End.
YES End.
NO Check the developing assembly
locking lever.
NO Check the developing assembly.
YES End.
NO Replace the DC controller PCB.
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