19. Image quality problems
19.1.16
Back marking
A. Typical faulty images
B. Troubleshooting procedure
Step
Section
1
Paper path
2
Fuser unit
3
4
Transfer belt unit
5
6
312
Check item
Is there a foreign matter on the
paper 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, oil, or other foreign mat-
ter?
Is the transfer roller dirty or
scratched?
Has the problem been eliminated
through the checks of steps up to
5?
Field Service Ver. 1.0 May 2008
Result
Action
YES
Remove the foreign matter.
YES
Clean or change.
YES
Change the fuser unit.
YES
Clean.
YES
Change the transfer roller.
Change the transfer belt unit.
Change the fuser unit.
NO
Change the high voltage unit/1.
Change the high voltage unit/2.
A0CRF4C518DA