Field Service Ver. 1.0 Jun. 2008
19. Image quality problem
361
T
roubleshooting
19.3.38
Printer 4-color: back marking
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C530DA
AA
Step
Section
Check item
Result
Action
1
2nd image trans-
fer roller unit
Image transfer roller is scratched or
dirty.
YES
Change transfer roller unit.
2
Paper path
There is foreign matter on paper
path.
YES
Remove foreign matter.
3
Fusing unit
Fusing entrance guide plate is
scratched or dirty.
YES
Clean or change.
4
Lower fusing roller is scratched or
dirty.
YES
Change fusing unit.
5
Transfer belt unit
Fingerprints, oil, or other foreign
matter is evident on the transfer
belt.
YES
Clean.
6
The problem has been eliminated
through the checks of steps up to 5.
NO
Change transfer belt unit.
o
Change high voltage unit.
d
-Color
M
F
201
Y109660-1 Sevice Manual