Troubleshooting Of Image Faults - Canon NP6320 Service Manual

C.

Troubleshooting of Image Faults

1. Light image (halftone areas only)
Cause Step
AE adjust-
ment
Black devel-
oping assem-
bly
Lens, Dust-
proofing glass
Photosensitive
drum
COPYRIGHT © 1999 CANON INC.
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1 Does the image quality improve after the
Basic Adjustment Procedure is followed?
2 Is the image lighter when a copy is made
using AE?
3 Is the image lighter when a copy is made
using a black developing assembly?
4 Is the image quality improved after the
lens, dust proofing glass, and mirror are
cleaned?
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Checks
YES/
Action
NO
YES End.
YES Perform AE adjustment.
YES Check that J39-1 and
J39-4 of the black devel-
oping assembly are con-
nected by a jumper wire.
If they are not, connect
them.
YES End.
NO Replace the drum unit.
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