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Replace the print head the device that houses the machine LASER, or the J or A printed circuit boards. Go with the LASER first if you can find one the Di520/620 are legacy machines from Minolta now Konica Minolta. Reset is Power off the Power on.
Please pres UTILITY key ,after touch Neter count to touch panel display,press in that order Stop - 0 -Stop -0 - 0 - 1; select COUNTER,select Consumables,select waste toner: SET : 320000 Counter:press C to cleared the value. After press exit etc.
You have to know what caused the problem first and make sure it dose not happen again. then there is a small access door held by one screw behind the toner door. turn on the copier wait 1 min then press the "trouble" switch, close the toner door and wait to see if it runs. DO NOT PRESS THE SERVICE SWITCH.
C10XX - C14XX these malfunctions code are concerned with faulty simptoms as they relate to software,hardware and communications.For remedial action change the board,check the cable connections and turn OFF and ON the power.80% you have be change a PWB-B board(in the right side, up by pass cover),20% touch the PWB-B reset switch.