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7
The copy is foggy (vertical).
8
The copy has black lines (feeding direction, fuzzy, thick).
Cause
Step
Scanner (dirt)
Potential control
system
Primary
charging
assembly
Pre-exposure
lamp
Fixing assembly
Developing rolls
Developing
assembly
Drum cleaner
unit
COPYRIGHT © 1999 CANON INC.
1
Does the problem occur in copy images
only?
2
Set the setting of the following in service
mode to '0', and turn off potential control:
COPIER>OPTION>BODY>PC-CNT. Is
the problem corrected?
3
Clean the primary charging wire, grid
wire, an shielding plate. Is the problem
corrected?
Is the light of the pre-exposure lamp even
during copying operation?
4
Clean the pre-exposure lamp. Is the
problem corrected?
5
Using the door switch actuator, press the
Copy Start key while keeping the front
cover open. Turn off the power switch
while copy paper is in the feeding
assembly, and check the image. Is the
copy image normal?
6
Is the toner on the developing cylinder in
an even coating?
CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
CHAPTER 13 TROUBLESHOOTING
Checks
Yes/No
Action
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
as in II. "Standards and
Adjustments" in
Chapter 13.
YES
End.
YES
End.
NO
The cause is after the
fixing system. Check
the fixing assembly
upper and lower rolls
for dirt.
NO
Check the edge of the
blade of the developing
assembly.
YES
1. Remove the drum
cleaner blade, and
check the edge.
2. Check the drum
cleaner unit.
13-71
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Troubleshooting
