Gradation Reproduction Failure - Konica Minolta magicolor 4690MF Service Manual

19. Image quality problems
19.1.6

Gradation reproduction failure

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Imaging unit
2 PH unit
IDC sensor
3
board/Re, /Fr
4
302
Check item
Is the outside dirty?
Is the window surface dirty?
Is the sensor dirty?
Has the problem been eliminated
through the checks of steps up to
3?
Field Service Ver. 1.0 May 2008
Result Action
YES Clean.
YES Clean.
YES Clean.
Change the imaging unit.
Change the PH unit.
NO Change the IDC sensor board.
Change the high voltage unit/1.
Change the high voltage unit/2.
A0CRF4C508DA