Troubleshooting Of Image Faults - Canon NP6317 Service Manual

C.

Troubleshooting of Image Faults

1. Light image (halftone areas only)
Cause/Problem
Procedure
area
1
AE adjust- 2
ment
Black devel- 3
oping assem-
bly
Lens, dust- 4
proofing glass
Photosensitive
drum
COPYRIGHT © 1999 CANON INC.
Check
Does the image quality improve after the
basic adjustment procedure is followed?
Is the image lighter is when a copy is
made using AE?
Is the image lighter when a copy is made
using a black developing assembly?
Is the image quality improved after the
lens, dust proofing glass, and mirror are
cleaned?
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Result
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.
Action
10-25