Printer 4-Color: Colored Spots - Konica Minolta bizhub C650 Service Manual

18. Image quality problem
18.3.35

Printer 4-color: colored spots

A. Typical faulty images
B. Troubleshooting procedure
Step Section
Imaging unit
1
Transfer belt unit Fingerprints, oil, or other foreign
2
3
Transfer roller
4
unit
Paper path
5
6 Fusing unit
7
730
AA AA
Check item
The surface of the PC drum is
scratched.
matter is evident on the image
transfer belt.
Transfer belt is dirty or scratched.
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. 8.0 Jun. 2008
4036fs4052c0
Result
YES Change imaging unit.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change transfer belt unit if belt is
damaged.
YES Change transfer roller unit.
YES Remove foreign matter.
YES Change fusing unit.
NO Change transfer belt unit.
Action