Konica Minolta bizhub C360 Service Manual page 776

Field Service Ver. 2.1 Feb. 2012
23.3.17 Printer monocolor: uneven density in sub scan direction
A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 High image
density original
2 Drum unit/
developing unit
3
4 PH unit
5 Transfer roller
unit
6
7 Transfer belt
unit
8
Check item
Uneven density in sub scan direc-
tion occurs at a pitch of 40 mm to
50 mm when a multi-copy cycle is
run using an original with high
image density (50% or more).
The surface of the PC drum is
scratched.
Dirty on the outside.
The surface of the PH window is
dirty.
Image transfer roller is installed
properly.
Image transfer roller is dirty or
scratched.
Is abnormality found in the cam
gear?
The problem has been eliminated
through the checks of steps up to 7.
23. IMAGE QUALITY PROBLEM
Result Action
YES Feed 10 to 20 blank sheets of
paper with no originals placed, as
the developing unit fails to keep
up with a high demand for toner.
YES Change drum unit.
YES Clean.
YES Clean with cleaning jig.
NO Reinstall.
YES Change transfer roller unit.
YES Change transfer belt unit.
NO Change developing unit.
→ Change PH unit.
→ Change High voltage unit.
→ Printer control board.
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