Printer Monocolor: Gradation Reproduction Failure - Konica Minolta bizhub C25 Service Manual

Field Service Ver. 1.1 May 2011
22.2.17

Printer monocolor: gradation reproduction failure

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Photo/density
2 PH unit
3 IDC sensor
4
Check item
Original type and screen pattern are
selected properly.
The surface of the PH window is
dirty.
The surface of the IDC sensor is
dirty.
The problem has been eliminated
through the checks of steps up to 3.
22. IMAGE QUALITY PROBLEM
Result Action
NO Change screen pattern.
YES Clean with cleaning jig.
YES Clean.
NO Change imaging unit.
 Change printer control board
 Change PH unit.
 Change high voltage unit.
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