Table 2-20 Image defects table (continued)
Problem Sample Cause Solution
Vertical streaks or bands appear
on the page.
Scratches are present on the
circumference of the
photosensitive drum.
Replace the toner cartridge of the
color that matches the defect.
Scratches are present on the
circumference of the fuser
roller.
Replace the fuser.
Scratches are present on the
circumference of the ITB.
Replace the ITB.
The ITB drive roller is deformed
or has deteriorated.
The ITB cleaning mechanism is
malfunctioning.
Vertical white lines appear in a
particular color.
The laser beam window is dirty. Clean the window and remove any
foreign substances.
Scratches are present on the
circumference of the
developing cylinder or
photosensitive drum.
White scratch down the page
could mean the scanner glass
needs to be cleaned.
Remove the affected toner cartridge
and re-install it. The PGCs will clean
the glass.
If the problem persists, replace the
affected toner cartridge.
The laser/scanner-unit mirror is
dirty.
Replace the laser/scanner assembly.
Vertical white lines appear in all
colors.
Horizontal scratches on the
fuser roller.
Replace the fuser.
Scratches are present on the
circumference of the ITB.
White scratch down the page
could mean the scanner glass
needs to be cleaned.
Remove the affected toner cartridge
and re-install it. The PGCs will clean
the glass.
Replace the ITB.
Horizontal lines appear on the
page.
Repetitive horizontal lines
appear.
Use the repetitive defects ruler to
identify the dirty roller. Clean the
roller. If the roller cannot be cleaned,
replace the fuser.
Horizontal scratches are
present on the photosensitive
drum.
Replace the toner cartridge of the
color that matches the defect.
Horizontal scratches are
present on the fuser roller.
Replace the fuser.
ENWW Solve image-quality problems 109
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