Low Image Density - Konica Minolta bizhub c20 Service Manual

Field Service Ver. 1.0 Sep. 2008
20.1.5

Low image density

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Imaging unit
2 PH unit
3
Transfer belt unit
4
5 Paper
IDC sensor
6
board/R, /F
7
Check item
Is the outside dirty?
Is the window surface dirty?
Is the contact on the rail of the
transfer belt in good contact with
the mating part?
Is the terminal dirty?
Is the paper damp?
Is the sensor dirty?
Has the problem been eliminated
through the checks of steps up to
6?
20. Image quality problems
Result Action
YES Clean.
YES Clean.
NO Check or correct contact.
YES Clean.
Change the paper with paper that
YES
has just been unwrapped.
YES Clean.
Change the imaging unit.
Change the transfer belt unit.
Change the PH unit.
NO Change the IDC sensor board.
Change the print control board.
Change the high voltage unit/1.
Change the high voltage unit/2.
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