Cause

Colour regustration sensor (C-4641 - Yellow, C-4642 Magenta, C-4643 - Cyan, C-4644 Black)

Resolution

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( On the 1060 and above please make sure toner reduction on the paper tray is turned off)

1    Power the machine OFF from the main switch leaving the sub switch ON.
2    Turn main power switch ON while pressing the Utility/Counter key. Keep holding it till the comes up in Service mode.
3    Press 02 Process Adjustment
4    Press 02 Drum Peculiarity
5    Select 04 Toner Density Revert, Select "All On" button, then hit the Start Button on the keypad, the machine should start to make a noise.

(if the readings are very high on any of the colours perform as below for that colour
Values for toner should be in around 6.4, you might have to run a few times to get it near 6.4)

6    Select 02 and run the Gamma Automatic Adjustment, a message "Completed" will appear in the top left when finished.
7    Exit Service mode to return to normal operation