Samsung SCX-4520, User Manual

Page: 219 / 322

T
ROUBLESHOOTING
9.20
Toner specs • The paper may not meet specifications; for example, the
paper is too moist or too rough. See “Paper Specifications”
on page F.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 8.11.
Dropouts 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 F.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.
Vertical lines 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 8.5).
Gray background If the amount of background shading becomes
unacceptable:
• Change to a lighter weight paper. See “Paper
Specifications” on page F.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.
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