COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
CHAPTER 6 TROUBLESHOOTING
6-82
3.3.7 The copy is foggy in vertical direction
3.3.8 The copy has a vertical line (vertical, thick, fuzzy)
Scanner (dirt)
1) Does the problem occur only in copy images?
YES: The cause is between the scanner and the CCD. Check the follow-
ing:
1. Scanning lamp for dirt and life.
2. Reflecting plate, mirror, lens, and standard white plate for dirt.
Potential control system
2) Set ‘0’ to the following in service mode to disable potential control:
COPIER>OPTION>BODY>P9-CNT. Is the problem corrected?
YES: The cause is in the potential control mechanisms. Make checks ac-
cording to the instructions for the potential control mechanism in
“2.7.11 Checking the Surface Potential Control System”.
Primary charging assembly
3) Clean the primary charging wire, grid wire, and shielding plate. Is
the problem corrected?
YES: End.
Pre-exposure lamp
4) Clean the pre-exposure lamp. Is the problem corrected?
YES: End.
Fixing assembly
5) Using the door switch actuator, make copies with the front cover
open. Turn off the power switch while paper is in the feeding assem-
bly, and check the image. Is the image normal?
YES: The cause is after the fixing system. Check the fixing assembly up-
per/lower roller for dirt.
Developing assembly, Drum cleaner unit
6) Is the developing cylinder coated with toner evenly?
NO: 1. Check the edge of the blade of the developing assembly.
2. Check to make sure that the front fixing plate of the developing
magnet is secured in place.
YES: 1. Remove the drum cleaning blade, and check its edge.
2. Check the drum cleaner unit.
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