Lexmark C912 Service Manual - Page 146

5055-xxx Missing colors Possible cause Toner cartridge unit Photodeveloper High voltage unit LED printhead unit LED printhead controller board High voltage unit (HVU) Transfer belt unit Action Be sure the toner cartridge and the PC drum unit are properly seated. Be sure the contacts on the print unit are clean. Be sure the print unit is installed in the correct position. Run a print test. If the problem remains, switch the toner cartridge with another color and run a test print. If the new color prints, replace the failing toner cartridge. If the problem remains, check the connector on the high voltage unit. Replace the high voltage unit If the problem remains. If the problem remains, replace the printhead and EPROM. If the problem remains, replace the printhead controller board. If the problem remains, replace the high voltage unit. If the problem remains, replace the transfer belt unit. 2-96 Service Manual