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©
2000 CANON INC. 2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000
CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
4-9 T
3.7 The print if foggy vertically
3.8 The print has black lines (vertical, blurred, thick)
Reader unit
1) Does the problem occur on copy images only?
YES: The cause is in the reader unit. Check the following:
1. Scanning lamp for dirt and life
2. Reflecting plate, mirrors, lens, and glass for dirt
3. Standard white plate (back of copyboard glass) for dirt
Fixing assembly
2) During printing, turn off the main power switch while paper is in the
feeding assembly; then, check the image on the paper. Is it normal?
YES: The cause is in a process after the fixing system. Check the follow-
ing:
1. Fixing assembly upper roller for dirt
2. Web for dirt
Potential control system
3) Set ‘0’ to the following in service mode to turn off potential control:
COPIER>OPTION>BODY>PC-CNT. Is the problem corrected?
YES: The problem is in the potential control system. Make checks for
the potential control system in Chapter 3 “Standards and Adjust-
ments.”
Primary charging assembly
4) Clean the primary charging wire, grid wire, and shielding plate. Is the
problem corrected?
YES: End.
Pre-exposure lamp
5) Clean the pre-exposure lamp. Is the problem corrected?
YES: End.
Developing assembly, Photosensitive drum cleaner unit
6) Is the surface of the developing cylinder coated with an even layer of
toner?
NO:
1. Check the edge of the blade of the developing assembly.
2. Check the surface of the developing cylinder.
YES:
1. Check the edge of the cleaning blade of the photosensitive drum.
2. Check the photosensitive drum cleaner unit.
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