Lexmark 4049LMO Service Manual - Page 59

4049-XXX Regularly Spaced Marks This is caused by a defect on one of the rolls or gears in the print process. The damaged part can be determined by the spacing of the marks according to the following table. Find and replace the damaged part. Component PC Drum (part of print cartridge) Transfer Roll Fuser Hot Roll Fuser Backup Roll Charge Roll (part of print cartridge) Developer Roll (part of print cartridge) Prealigner Feed Roller Auxiliary Feed Roller Print Defect Spacing on Page 125.7 mm 53.1 mm 78.9-79.2 mm 69.1 mm 37.1-37.7 mm 40.0mm 68.5 mm 68.5 mm Spacings other than the ones listed could be caused by damage or a bind in the gear train. Residual Image Residual image--the "walking" of a leftover image down the page--is probably the result of failed erase lamps not discharging the photoconductor, or of a failed cleaner inside the print cartridge. It can also be caused by a failed fuser hot roll retaining toner and redepositing it on the page. Check that the erase lamp voltage at engine board J91 is +24 VDC and that the cable has continuity. To test the erase lamps, jumper engine board J9-2 to ground. Random Marks Random marks are nearly always due to a mechanical problem or due to foreign matter loose in the printer or in the print cartridge. Diagnostic Information 2-32