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using OEM DEVELOPER ??
how old a DEV UNITS ???
May be that
M Sub Hopper is adding too much toner /over toning
any e020 codes ?
execute auto gradation correction (full correction) before and after performing shading correction ?
COPIER>ADJUST>DENS>SGNL-Y/C/M/K arethe Initialization settings that the copier maintains and are located on the door sheet.
If the Initialization setting is not the same as the door sheet, be sure to enter the correct value and replace the Developer Unit.
If the ATR Sensor reading is over +/-50 of the Initialization setting; the ATR Sensor, Patch Detection Sensors, Drum Unit and DC Controller are suspect.
Check the status of the Drum Unit under
COPIER>COUNTER>DRBL-1>PT-DRM. The Patch Detection Sensors looks at patches of toner that are generated on the drum for each color and determines the amount of toner that is in each patch by the amount of reflected light. If the drum is not creating these patches correctly, the patch readings will be affected. Replace the Drum Unit if it is close to or over 100% of its rated life.
If the Drum Unit is not close to or over its rated life, replace the ATR Sensor and Patch Detection Sensors. If the error continues replace the DC Controller.
If over toning continues to occur the Developing Clutch (CL1) may be sticking and need to be replaced.
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