Olivetti PF-P09, Service Manual

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Field Service Ver. 1.1 May 2011 22. IMAGE QUALITY PROBLEM
359
TROUBLESHOOTING
22.2.15 Printer monocolor: uneven density in main scan direction
A. Typical faulty images
B. Troubleshooting procedure
A02EF4C521DA
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 PH unit.
Change high voltage unit.
d-Color MF2400