Printer Monocolor: Uneven Density In Main Scan Direction - Konica Minolta bizhub C25 Service Manual

Field Service Ver. 1.1 May 2011
22.2.15

Printer monocolor: uneven density in main scan direction

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Imaging unit
2
3 PH unit
4 Transfer roller
5 Transfer belt unit Transfer belt unit makes positive
6
7
Check item
The surface of the PC drum is
scratched.
Dirty on the outside.
The surface of the PH window is
dirty.
Check that the spring does not
come off during the pressure oper-
ation of the transfer roller.
contact with plates on rails.
Is abnormality found in the cam
gear?
The problem has been eliminated
through the checks of steps up to 6.
22. IMAGE QUALITY PROBLEM
Result Action
YES Change imaging unit.
YES Clean.
YES Clean with cleaning jig.
NO Correct.
Change transfer roller unit.
NO Check and correct contacts.
YES Change transfer belt unit.
NO Change PH unit.
Change high voltage unit.
A02EF4C521DA
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