4-Color: Colored Spots - Konica Minolta magicolor 7450 Service Manual

16. Image quality problem
16.3.21

4-Color: colored spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Imaging Unit
1
Transfer Belt
2
3
4 Transfer Roller
Paper path
5
6 Fusing Unit
7
236
AA AA
Check Item
The surface of the PC Drum is
scratched.
Fingerprints, oil, or other foreign
matter is evident on the Transfer
Belt.
Transfer Belt is dirty or scratched.
Transfer Roller is dirty or scratched. YES Change Transfer Roller Unit.
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 May 2006
4036fs4052c0
Result
YES Change Imaging Unit.
YES Clean with specified solvent.
(See Maintenance.)
YES Clean dirty belt with a soft cloth.
Change Transfer Belt if belt is
damaged.
YES Remove foreign matter.
YES Change Fusing Unit.
NO Change Transfer Belt.
Action