Konica Minolta Magicolor 8650 Service Manual page 409

16. Image quality problem
16.3.21 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
368
Confidential – for internal use only, do not distribute
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. 2.0 Nov. 2007
Result Action
YES Change imaging unit.
YES Clean.
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.
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