Konica Minolta Bizhub-C31P, Service Manual, Page: 267 / 370

16. Image quality problems Field Service V er. 1.0 Apr. 200 8
230
bizhub C31P
T
roubleshooting
16.1.10 Colored spots
A. Typical faulty images
B. Troubleshooting procedure
A0EAF4C510DA
colored spots
Step Section Check item Result Action
1
Imaging unit
Are the spots in a single color? YES Change the imaging unit.
2
Are there scratches or lines evi-
dent on photo conductor surface?
YES Change the imaging unit.
3
Transfer belt
Is the transfer belt dirty with fin-
gerprints, oil, or other foreign mat-
ter?
YES Clean.
4
Is the transfer belt dirty or
scratched?
YES
Wipe the surface clean of dirt with
a soft cloth.
Change a scratched transfer belt
for a transfer belt.
5
Is the transfer roller dirty or
scratched?
YES Change the transfer roller.
6 Media path
Is there a foreign matter on the
media path?
YES Remove foreign matter.
7 Fuser unit
Is the fusing roller dirty or
scratched?
YES Change the fuser unit.
8
Has the problem been eliminated
through the checks of steps up to
7?
NO Change the transfer belt.