Samsung SCX-4720FN User Manual page 225

Condition
Toner specs
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaBbCc
Dropouts
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaBbCc
Vertical lines
AaBbCc AaBbCc
AaBbCc AaBbCc
AaBbCc AaBbCc
AaBbCc AaBbCc
AaBbCc AaBbCc
Gray background
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaBbCc
9.20 T
ROUBLESHOOTING
Suggested solutions
• The paper may not meet specifications; for example, the
paper is too moist or too rough. See "Paper Specifications"
on page D.6.
• The transfer roller may be dirty. Clean the inside of your
machine. See "Cleaning the Inside" on page 8.3.
• The paper path may need cleaning. See "Cleaning the
Drum" on page 8.10.
If faded areas, generally rounded, occur randomly on the
page:
• A single sheet of paper may be defective. Try reprinting the
job.
• The moisture content of the paper is uneven or the paper
has moist spots on its surface. Try a different brand of
paper. See "Paper Specifications" on page D.6.
• The paper lot is bad. The manufacturing processes can
cause some areas to reject toner. Try a different kind or
brand of paper.
• The toner cartridge may be defective. See "Vertical
repetitive defects" on page 9.21.
• If these steps do not correct the problem, contact a service
representative.
If black vertical streaks appear on the page:
• The drum inside the toner cartridge has probably been
scratched. Remove the toner cartridge and install a new
one. See "Replacing the Toner Cartridge" on page 8.8.
If white vertical streaks appear on the page:
• The surface of the LSU part inside the machine may be
dirty. Clean the LSU (see page 8.4).
If the amount of background shading becomes
unacceptable:
• Change to a lighter weight paper. See "Paper
Specifications" on page D.6.
• Check the machine's environment: very dry (low humidity)
or high humidity (higher than 80% RH) conditions can
increase the amount of background shading.
• Remove the old toner cartridge and install a new one. See
"Replacing the Toner Cartridge" on page 8.8.