The Copy Is Foggy (Entire Area) - Canon ImageRunner 600 Service Manual

CHAPTER 13 TROUBLESHOOTING
6

The copy is foggy (entire area).

Cause Step
Scanner
Potential control
system
Cleaner
assembly
Pre-exposure
lamp, DC
controller PCB
Developing rolls
Developing
cylinder
13-70
COPYRIGHT © 1999 CANON INC.
1 Perform the Image Adjustment Basic
Procedure. Is the problem corrected?
2 Does the problem occur in copy images
only?
3 Set the following to '0' in service mode,
and turn off the potential control:
COPIER>OPTION>BODY>PC-CNT. Is
the problem corrected?
4 Is the cleaning blade mounted correctly?
5 Is the pre-exposure lamp on during
copying operation?
6 Are the developing rolls worn?
Checks
CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
Yes/No Action
YES End.
YES The cause is between
the scanner and the
CCD; check the
following:
1. scanning lamp for
dirt and end of life.
2. reflecting plate,
mirror, lens, and
standard white plate
for dirt.
YES The cause is in the
potential control
system. Make checks
according to II.
"Standards and
Adjustments" in
Chapter 13.
NO Mount the cleaning
blade correctly.
NO 1. Replace the pre-
exposure lamp.
2. Replace the DC
controller PCB.
YES Replace the developing
rolls.
NO Replace the developing
cylinder.