Konica Minolta Magicolor 8650 Service Manual page 412

Field Service Ver. 2.0 Nov. 2007
16.3.24 Printer 4-color: back marking
A. Typical faulty images
B. Troubleshooting procedure
Step Section
2nd image trans-
1
fer roller unit
Paper path
2
Fusing unit
3
4
Transfer belt unit
5
6
Confidential – for internal use only, do not distribute
Check item
Image transfer roller is scratched or
dirty.
There is foreign matter on paper
path.
Fusing entrance guide plate is
scratched or dirty.
Lower fusing roller is scratched or
dirty.
Fingerprints, oil, or other foreign
matter is evident on the transfer
belt.
The problem has been eliminated
through the checks of steps up to 5.
16. Image quality problem
AA AA
A02EF4C530DA
Result Action
YES Change transfer roller unit.
YES Remove foreign matter.
YES Clean or change.
YES Change fusing unit.
YES Clean.
NO Change transfer belt unit.
→ Change high voltage unit.
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