Lexmark C912 Service Manual - Page 145

Black line Possible cause Photodeveloper drum • Fuser detach pawl • Fuser roller surface • Fuser thermistor surface LED printhead Black print Possible cause High voltage unit (HVU) Sub-frame Photodeveloper drum set 5055-xxx Action Clean any dirt from the drum surface. Replace it if it is scratched. Remove any toner buildup. Replace the fuser. Clean the LED printhead. Print a blank document. Replace the LED printhead if a black line appears on the paper. Action The printed paper has black print. Be sure the high voltage unit is properly connected. If the problem remains, replace the high voltage unit. If the problem remains, replace the right sub-frame contacts. If the problem remains after replacing the sub-frame, be sure the photodeveloper has clean contacts. If necessary, replace the photodeveloper. Diagnostic information 2-95