Printer 4-Color: Colored Spots - Konica Minolta bizhub C450 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
Image Transfer
2 Belt Unit
3
Image Transfer
4
Roller Unit
Paper path
5
Paper Dust
6
Remover
7 Fusing Unit
8
416
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.
Paper dust accumulates on Paper
Dust Remover.
Fusing Belt is dirty or scratched.
The problem has been eliminated
through the checks of steps up to 7.
Field Service Ver. 1.0 Mar. 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 Image Transfer Roller
Unit.
YES Remove foreign matter.
YES Clean or change.
YES Change Fusing Unit.
NO Change Image Transfer Roller
Unit.
→ Change Image Transfer Belt
Unit.
→ Change Fusing Unit.
Action