The Copy Is Foggy In Vertical Direction; The Copy Has A Vertical Line (Vertical, Thick, Fuzzy) - Canon iR8500 Servise Manual

CHAPTER 6 TROUBLESHOOTING

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-
Potential control system
2) Set '0' to the following in service mode to disable potential control:
YES: The cause is in the potential control mechanisms. Make checks ac-
Primary charging assembly
3) Clean the primary charging wire, grid wire, and shielding plate. Is
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
YES: The cause is after the fixing system. Check the fixing assembly up-
Developing assembly, Drum cleaner unit
6) Is the developing cylinder coated with toner evenly?
NO:
YES: 1. Remove the drum cleaning blade, and check its edge.
6-84
ing:
1. Scanning lamp for dirt and life.
2. Reflecting plate, mirror, lens, and standard white plate for dirt.
COPIER>OPTION>BODY>P9-CNT. Is the problem corrected?
cording to the instructions for the potential control mechanism in
chapter 6 "2.7.12 Checking the surface Potential Control System".
the problem corrected?
open. Turn off the power switch while copy paper is in the feeding
assembly, and check the image. Is the copy image normal?
per/lower roller for dirt.
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.
2. Check the drum cleaner unit.
COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500 REV.0 MAR. 2001