Gradation Reproduction Failure - Konica Minolta magicolor 2490MF Service Manual

17. Miscellaneous errors
17.2.13

Gradation reproduction failure

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Drum cartridge
2 PH unit
3 IDC sensor
4 -
262
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Check Item
Is the outside dirty?
Is the window surface dirty?
Is the sensor dirty?
The problem has been eliminated
after performing step 3.
Field Service Ver. 1.0 Jul. 2006
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Result Action
YES Clean.
YES Clean.
YES Clean.
Replace the toner cartridge.
→ Replace the PH unit.
NO
→ Replace the IDC sensor.
→ Replace the hight voltage unit.