Foggy Background - Konica Minolta magicolor 4690MF Service Manual

Field Service Ver. 1.0 May 2008
19.1.7

Foggy background

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1
2
Imaging unit
3
4
5 PH unit
IDC sensor
6
board/Re, /Fr
7
Check item
Are there scratches or lines evi-
dent on photo conductor surface?
Is the outside dirty?
Is the connector or contact termi-
nal between each imaging unit
and PH unit connected properly?
Is the developing bias contact ter-
minal in good contact?
Is the window surface dirty?
Is the sensor dirty?
Has the problem been eliminated
through the checks of steps up to
6?
19. Image quality problems
Result Action
YES Change the imaging unit.
YES Clean.
Clean the contact terminal or
NO
reconnect the connector.
Clean the contact terminal or
NO
check the terminal position.
YES Clean.
YES Clean.
Change the PH unit.
NO
Change the IDC sensor board.
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