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Check if you have put the little pwb inproperly or, in worst case, you have loose it. This pwb is in the left side of the processor unit. You will see a black circle tape near the grey tape of the grid cleaner.
remove
the drum unit. on the part of the unit that goes first in machine is
the is waste toner container. on each side of the container there is a
screw, remove one screw and pull out the cover. slant the unit and the
waste will come out
C7980, Defective waste toner sensor or engine board. Try this, shake the process unit from side to side and turn the power switch off and then on. If the problem cannot be soved, replace the process unit. After replacing the proces sunit, turn the power switch off then on. If the problem cannot be solved, replace the waste toner sensor or the engine board.
The errorcode comes up when the waste toner is full. Unfortunately the waste toner collection is in the process unit. You will have to replace the whole cartidge.
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