Lexmark Optra 4049 Series, Service Manual

Page: 59 / 194

Diagnostic Information 2-32
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 dam-
aged part.
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 photo-
conductor, 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 J9-
1 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.
Component Print Defect Spacing on Page
PC Drum (part of print cartridge) 125.7 mm
Transfer Roll 53.1 mm
Fuser Hot Roll 78.9-79.2 mm
Fuser Backup Roll 69.1 mm
Charge Roll (part of print car-
tridge) 37.1-37.7 mm
Developer Roll (part of print car-
tridge) 40.0mm
Prealigner Feed Roller 68.5 mm
Auxiliary Feed Roller 68.5 mm