Konica Minolta Bizhub-C31P, Service Manual, Page: 259 / 370

16. Image quality problems Field Service V er. 1.0 Apr. 200 8
222
bizhub C31P
T
roubleshooting
16.1.2 White lines/bands, colored lines/bands in main scan direction
A. Typical faulty images
B. Troubleshooting procedure
A0EAF4C502DA
white lines in
main scan direction
white bands in
main scan direction
colored lines in
main scan direction
colored bands in
main scan direction
Step Section Check item Result Action
1
Imaging unit
Are there scratches or lines evi-
dent on photo conductor surface?
YES Change the imaging unit.
2 Is the outside dirty? YES Clean.
3
Is the connector or contact termi-
nal between each imaging unit
and PH unit connected properly?
NO
Clean the contact terminal or
reconnect the connector.
4
Is the developing bias contact ter-
minal in good contact?
NO
Clean the contact terminal or
check the terminal position.
5
Transfer belt
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.
6
Is the transfer roller dirty or
scratched?
YES Change the transfer roller.
7 Media path
Is there a foreign matter on the
media path?
YES Remove the foreign matter.
8
Fuser unit
Is the fusing entrance guide plate
dirty or scratched?
YES Clean.
9 Is the separator fingers dirty? YES Change the fuser unit.
10
Has the problem been eliminated
through the checks of steps up to
9?
NO
Change the DC power supply.
Change the transfer belt.