Troubleshooting Image Faults; The Copy Is Too Light (Halftone Only) - Canon NP6251 Service Manual

C. Troubleshooting Image Faults

1. The copy is too light (halftone only).

Cause Step
1
Scanner 2
Developing 3
assembly
Developing 4
assembly
Lamp regulator 5
DC controller
PCB
COPYRIGHT © 1997 CANON INC.
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Checks
Perform the Image Adjustment
Basic Procedure. Is the problem
corrected?
Clean the standard white plate,
mirror, lens, and dust-proofing
glass. Is the problem corrected?
Are the rolls of the developing
assembly in firm contact with the
drum during copying?
Is the developing cylinder coated
with an even layer of toner?
Replace the lamp regulator. Is the
problem corrected?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
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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