HP Color LaserJet Enterprise MFP M680 series - Service mode functions

Table 2-64 Image defects table (continued)
Problem Sample Cause Solution
Vertical white lines appear in a
particular color.
A unknown substance has
adhered to the laser beam
window
Remove any unknown substances.
Scratches are present on the
circumference of the
developing roller or
photosensitive drum.
Remove the affected toner cartridge
and re-install it. The PGCs will clean
the glass.
If the problem persists, replace the
affected toner cartridge.
M680 product only: White
scratch down the page could
mean the scanner glass needs
to be cleaned.
Clean the glass.
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 477