Back Marking - Konica Minolta magicolor 1680MF Service Manual

20. Image quality problems
20.1.16

Back marking

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Media path
2
Fuser unit
3
imaging
4
cartridge
2nd transfer
5
roller
6
274
Check item
Is there a foreign object in the
media path?
Is the fusing entrance guide plate
dirty or scratched?
Is the fusing roller scratched or
dirty?
Is the transfer belt dirty with fin-
gerprints or foreign matter?
Is the 2nd transfer roller dirty or
scratched?
Have steps 1 to 5 eliminated the
problem?
Field Service Ver. 1.0 Nov. 2008
Result Action
YES Remove the foreign object.
YES Clean or replace.
YES Replace the fuser unit.
YES Clean.
YES Replace the 2nd transfer roller.
Replace the imaging cartridge.
→ Replace the fuser unit.
NO
→ Replace the high voltage unit.
A0CRF4C518DA