Printer 4-Color: Incorrect Color Image Registration - Konica Minolta bizhub C25 Service Manual

22. IMAGE QUALITY PROBLEM
22.2.30

Printer 4-color: incorrect color image registration

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Machine
condition
2 Transfer belt
unit
3
4
5 Imaging unit
6 Transfer roller
unit
7
8
374
AA
AA AA
Check item
Vibration is given to the machine
after main power switch has been
turned ON.
Fingerprints, oil, or other foreign
matter is evident on the transfer belt.
Transfer belt is dirty or scratched.
Drive coupling to the machine is
dirty.
The surface of the PC drum is
scratched.
Transfer roller is installed properly.
Transfer roller is dirty or scratched.
The problem has been eliminated
through the checks of steps up to 7.
Field Service Ver. 1.1 May 2011
Result Action
YES Turn off the main power switch
and turn it on again more than 10
seconds after.
YES Clean it with the tender cloth or
paper which is dusted with the
toner.
YES Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
YES Clean.
YES Change imaging unit.
NO Reinstall.
YES Change transfer roller unit.
NO Change transfer belt unit.
Change printer control board.
Change MFP board/2.
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