The Print Has Uneven Density (Darker At Front); The Print Has Uneven Density (Lighter At Front) - Canon iR5000 Service Manual

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

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.
2.
Developing assembly
2) Are the rolls of the developing assembly in firm contact with the photo-
sensitive drum?
NO:
3) Is the surface of the developing cylinder coated with an even layer of
toner?
NO:
1.
2.
3.
YES: Check the nip of the fixing roller.
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Replace the pre-exposure lamp.
Replace the DC controller PCB.
Check to see if the developing assembly locking unit is mounted
correctly.
Clean the edge of the blade of the developing assembly. (dry wip-
ing)
Clean the surface of the developing cylinder.
Check to see if the toner inside the developing assembly is thicker
on one side.
2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000
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