Hint If a defect is not depicted, record the probable cause along with the conditions in the printing environment and save a copy of the defect for future reference. Black Lines (vertical) Black Page Blank Page C4170-90959 Image Formation Troubleshooting 113 Possible Cause Action Defective Toner Cartridge. Inspect the Toner Cartridge for a scratched photosensitive drum or toner leaking through worn seals. Replace the Cartridge as necessary. Fuser is contaminated or damaged. Inspect the Fuser for toner build-up or scratches on the fuser rollers. Try cleaning with alcohol. Replace the Fuser if damaged. Broken lens in scanner. Replace laser scanner.
Possible Cause Action Poor contact between the primary bias contact on the Engine Controller Assembly and the cartridge. Inspect the contacts. If the parts are deformed or damaged, replace them. Defective Toner Cartridge. Replace the Toner Cartridge. Engine Controller Assembly is defective. If the Engine Controller turns on the laser beam continuously, the entire surface of the Photosensitive drum is neutralized causing a completely black page. Replace the Engine Controller Assembly and the Intermediate PCB. Possible Cause Action Software Configuration. Make sure the application is not sending incorrect page length requests, or extra page eject commands.
Print a self-test/configuration page to verify configuration. Multiple Feeds. The printer may be feeding two or more pages at once because the paper is difficult to separate. Remove the paper from the paper cassette and break the ream (do not fan the pages). See “Media Troubleshooting” (page 129)).