Lexmark C912 Service Manual - Page 134

5055-xxx Photodeveloper missing service check When you replace the photodeveloper unit, all three color units must be replaced at the same time. FRU 1 Photodeveloper 2 Sub-frame unit 3 High voltage unit 4 Printer controller board Action Check for dirt or damage to the sensing contacts on rear. Clean or replace the photodeveloper drum unit if necessary. Check the sensing contacts on the subframe assembly. Clean or replace the affected contacts or sub-frame. If the problem remains, replace the high voltage unit (HVU). If the problem remains, replace the printer controller board. 2-84 Service Manual