C-2557= ATDC Sensor abnormality to reset go to service mode, to enter service mode perform these steps, 1-press utility/counter button from the panel, 2-press check details, and press "STOP" 0,0, STOP 0,1 3-now you are in service mode, 4-click on tech rep mode,or Adjustment 5-now click on "Printer" 6-here increase the value, suppose you have 150, make it 170, press the clear button to clear it and enter new value which should be more than the previous one. press enter and exit from the service mode.
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