Printer 4-Color: Colored Spots - Konica Minolta bizhub C250 Service Manual

18. Image quality problem
18.3.34

Printer 4-Color: colored spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Imaging Unit
1
Image Transfer
2 Belt Unit
3
2nd Image
4 Transfer Roller
Unit
Paper path
5
6 Fusing Unit
7
422
AA AA
Check Item
The surface of the PC Drum is
scratched.
Fingerprints, oil, or other foreign
matter is evident on the Image
Transfer Belt.
Image Transfer Belt is dirty or
scratched.
Image Transfer Roller is dirty or
scratched.
There is foreign matter on paper
path.
Fusing Belt is dirty or scratched.
The problem has been eliminated
through the checks of steps up to 6.
Field Service Ver. 1.0 Jul. 2005
4036fs4052c0
Result
YES Change Imaging Unit.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change Image Transfer Belt Unit
if belt is damaged.
YES Change 2nd Image Transfer
Roller Unit.
YES Remove foreign matter.
YES Change Fusing Unit.
NO Change Image Transfer Belt Unit.
Action