SHAKE THE BLACK IU VERY WELL Clean Imaging Unit Contacts RUN GRADATION
UPDATE FIRMWARE
REPLACE BLACK IU
SOURCE: c2558
Error code relates to an out of range ATDC sensor level detected on the black I.U
It normally happens when customer does not replace the toner when prompted.
It can usually be cleared by opening and closing the front or right side covers thus allowing the machine to cycle and add toner until it reaches an acceptable level.
If not cleared after four or five attempts go into service mode and run tcr toner supply for black.(In Image Adjustment)
This will clear down the error
Or you may need to replace the black IU if that doesnt work.
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