Printer 4-Color: Void Areas, White Spots - Konica Minolta bizhub C25 Service Manual

Field Service Ver. 1.1 May 2011
22.2.31

Printer 4-color: void areas, white spots

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Image check
2
3 Transfer belt unit Fingerprints, oil, or other foreign
4
5 Transfer roller
unit
6
7 Paper path
8
9
Void areas
Check item
There are void areas at the front
side or high density section.
There are void areas in the trailing
edge.
matter is evident on the transfer
belt.
Transfer belt is dirty or scratched.
Transfer roller is dirty or scratched.
Charge neutralizing needle is not
separated and ground terminal is
connected properly.
There is foreign matter on paper
path.
Pre-image transfer guide plate is
damaged or dirty.
The problem has been eliminated
through the checks of steps up to 8.
22. IMAGE QUALITY PROBLEM
White spots
Result Action
YES See P.373
YES Perform [TRANSFER POWER]
of [ADJUST] under SERVICE
MODE.
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 Change transfer roller unit.
NO Correct or change.
YES Remove foreign matter.
YES Clean or change.
NO Change transfer belt unit.
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