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C-2557 ATDC sensor malfunction.Enter in the service mode press following keys: Utility-Metercount-Details-STOP-0-0-Stop-0-1-press 00000000 press Enter in Tech. mode select Printer than select ATDC gain and read the ATDC current value.If the value is situate 150-160 increase the value to 164-174 (to change the value press C and entering the new value)return in the copy mode turn OFF the copier open the rigy door than close and turn ON the copier and make a few copies.If the error persist discrease the ATDC value and make some copies.If the code persist change the developer .Before change the developer reset the special parts counter I/U counter,developer.After change the developer perform F8 and verify the new value to ATDC gain and notice.
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