Colored Spots - Konica Minolta magicolor 4690MF Service Manual

19. Image quality problems
19.1.10

Colored spots

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1
Imaging unit
2
3
Transfer belt unit
4
5
6 Paper path
7 Fuser unit
8
306
colored spots
Check item
Are the spots in a single color?
Are there scratches or lines evi-
dent on photo conductor surface?
Is the transfer belt dirty with fin-
gerprints, oil, or other foreign mat-
ter?
Is the transfer belt dirty or
scratched?
Is the transfer roller dirty or
scratched?
Is there a foreign matter on the
paper path?
Is the fusing roller dirty or
scratched?
Has the problem been eliminated
through the checks of steps up to
7?
Field Service Ver. 1.0 May 2008
Result Action
YES Change the imaging unit.
YES Change the imaging unit.
YES Clean.
Wipe the surface clean of dirt with
a soft cloth.
YES
Change a scratched transfer belt
for a transfer belt.
YES Change the transfer roller.
YES Remove foreign matter.
YES Change the fuser unit.
NO Change the transfer belt unit.
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