Causes for white vertical lines
Cause
Solution
Photosensitive drum has grooves going around
the circumference.
Replace the print cartridge for the color in which
the white lines appear.
Laser is blocked by a foreign substance. Inspect the laser source for the affected color,
and remove any debris that might be blocking it.
Mirror in the laser/scanner unit is dirty. Replace the laser/scanner for the color in which
the white lines appear. Calibrate the printer after
replacing the laser/scanner. See
Calibrate now.
The fuser sleeve has vertical scars. (All colors
are affected.)
Replace the fuser.
Horizontal lines
Table 7-30. Causes for horizontal lines
Causes for horizontal lines
Cause
Solution
Photosensitive drum has scars running from end
to end.
Replace the print cartridge for the affected color.
The fuser sleeve has scars running from end to
end.
Replace the fuser.
White horizontal lines
Table 7-31. Causes for white horizontal lines
Causes for white horizontal lines
Cause Solution
Photosensitive drum has scars running from end
to end.
Replace the print cartridge for the affected color.
ETB belt has horizontal scars. Replace the ETB. Calibrate the printer after
replacing the ETB. See
Calibrate now.
Table 7-29. Causes for white vertical lines (continued)
362 Chapter 7 Troubleshooting ENWW
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