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Table 7-25. Causes for dirt on the front of the paper
Cause Solution
A Defective cartridge (deteriorated toner or
scratches on the developing cylinder,
photosensitive drum, or primary charging roller).
Replace the cartridge of the color that matches
the defect.
B Repetitive dirt (dirty registration sub roller, fuser
sleeve, feed sub roller, or face down delivery
roller).
Refer to the Table 7-39. Repetitive defect cause
table, later in this chapter, identify the roller with
which the problem is associated. Clean the dirty
roller. Replace the roller if the dirt does not come
off.
C Dirty multi-purpose tray pickup roller. Clean dirty places on the roller. Replace the roller
if the dirt does not come off.
Defective transfer unit. Check the transfer unit surface. If scratched or
dented, replace the transfer unit.
Defective transfer unit cleaning blade Replace the transfer unit.
Vertical lines
Table 7-26. Causes for vertical lines
Cause Solution
Photosensitive drum has grooves going around the
circumference.
Replace the cartridge for the color of the vertical
lines.
Fuser sleeve has grooves around the circumference. Replace the fuser.
White vertical lines
If the lines appear in a particular color, go to step A. If they appear in full-color print, go to
step B.
Table 7-27. Causes for white vertical lines
Cause Solution
A Circumferential scratches on the developing
cylinder (print cartridge).
Replace the print cartridge.
Circumferential scratches on the photosensitive
drum.
Replace the print cartridge.
B Vertical scratches on the transfer unit. Replace the transfer unit.
Vertical scratches on the fuser sleeve. Replace the fuser.
ENWW Image defects 395