Field Service Ver. 1.0 Jun. 2008
19. Image quality problem
339
T
roubleshooting
19.3.18
Printer monocolor: uneven density in main scan direction
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C520DA
Step
Section
Check item
Result
Action
1
Imaging unit
The surface of the PC drum is
scratched.
YES
Change imaging unit.
2
Dirty on the outside.
YES
Clean.
3
PH unit
The surface of the PH window is
dirty.
YES
Clean with cleaning jig.
4
Transfer roller
Check that the spring does not
come off during the pressure oper-
ation of the transfer roller.
NO
Correct.
Change transfer roller unit.
5
Transfer belt unit Transfer belt unit makes positive
contact with plates on rails.
NO
Check and correct contacts.
6
Is abnormality found in the cam
gear?
YES
Change transfer belt unit.
7
The problem has been eliminated
through the checks of steps up to 6.
NO
Change imaging unit.
o
Change PH unit.
o
Change high voltage unit.
d
-Color
M
F
201
Y109660-1 Sevice Manual