Problem Cause Solution
Vertical streaks or bands appear on the
page.
The ADF small glass might be dirty. Clean the ADF small glass.
Scratches are present on the
circumference of the photosensitive
drum.
Replace the print cartridge of the color that
matches the defect.
Scratches are present on the
circumference of the fuser roller.
Replace the fuser. See Fuser on page 200.
Scratches are present on the
circumference of the ITB.
Replace the ITB. See Intermediate transfer
belt (ITB) on page 209.
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.
Replace the print cartridge of the color that
matches the defect.
The laser/scanner-unit mirror is dirty. Replace the laser/scanner assembly. See
Laser/scanner assembly (Y/M) on page 325
or
Laser/scanner assembly (C/Bk)
on page 332.
Vertical white lines appear in all colors. Horizontal scratches on the fuser
roller.
Replace the fuser. See Fuser on page 200.
Scratches are present on the
circumference of the ITB.
Replace the ITB. See Intermediate transfer
belt (ITB) on page 209.
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 roller.
Horizontal scratches are present on
the photosensitive drum.
Replace the print cartridge of the color that
matches the defect.
Horizontal scratches are present on
the fuser roller.
Replace the fuser. See Fuser on page 200.
A horizontal white line appears on the
page.
Repetitive horizontal white lines
appear.
Use the repetitive defects ruler to identify the
dirty roller. Clean the roller. If the roller
cannot be cleaned, replace the roller.
Horizontal scratches are present on
the photosensitive drum.
Replace the print cartridge of the color that
matches the defect.
Scratches are present on the
circumference of the ITB.
Replace the ITB. See Intermediate transfer
belt (ITB) on page 209.
496 Chapter 7 Solve problems ENWW
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