Canon iR5000 - The Print Has Uneven Density (Darker at Front); The Print Has Uneven Density (Lighter at Front)

COPYRIGHT © 2000 CANON INC. 2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000
CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
4-7 T
3.4 The print has uneven density (darker at front)
3.5 The print has uneven density (lighter at front)
Pre-exposure lamp
1) Does the pre-exposure lamp turn on at an even intensity across its length
during printing?
NO:
1. Replace the pre-exposure lamp.
2. Replace the DC controller PCB.
Developing assembly
2) Are the rolls of the developing assembly in firm contact with the photo-
sensitive drum?
NO: Check to see if the developing assembly locking unit is mounted
correctly.
3) Is the surface of the developing cylinder coated with an even layer of
toner?
NO:
1. Clean the edge of the blade of the developing assembly. (dry wip-
ing)
2. Clean the surface of the developing cylinder.
3. Check to see if the toner inside the developing assembly is thicker
on one side.
YES: Check the nip of the fixing roller.
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