COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
CHAPTER 6 TROUBLESHOOTING
6-80
3.3.4 The copy has uneven density (darker front)
3.3.5 The copy has uneven density (lighter front)
----------
1) Perform the Image Adjustment Basic Procedure. Is the problem
corrected?
YES: End.
Developing assembly (position)
2) Are the developing members of the developing assembly in firm
contact with the photosensitive drum?
NO: Check the developing assembly locking unit.
Scanner (dirt)
3) Clean the scanning lamp, reflecting plate, side reflecting plate, mir-
ror, lens, and dust-proofing glass. Is the problem corrected?
YES: End.
Pre-exposure lamp
4) Is the pre-exposure lamp ON evenly during printing operation?
NO: 1. Replace the pre-exposure lamp.
2. Replace the DC controller PCB.
Developing assembly, Charging assembly, Paper
5) Is the developing cylinder coated evenly with toner?
NO: 1. Clean the tip f the blade of the developing assembly (dry wip-
ing).
2. Clean the surface of the developing cylinder.
3. Check to find out if the toner inside the developing assembly is
uneven.
YES: 1. Clean all the charging wires once again, and check the position
of each charging wire.
2. Try different paper.
3. Check the nip width of the fixing roller.
To Next Page
Loading...
Need help?
General
