Samsung SCX-4321 - Manual (Page 67)

Troubleshooting
9.9
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 8.4.
If white vertical streaks appear on the page:
• The surface of the LSU part inside the machine may be
dirty. Clean the LSU (“Cleaning the Inside” on
page 8.2). Contact a service representative.
Gray
background If the amount of background shading becomes
unacceptable:
• Change to a lighter weight paper. See “Paper
Specifications” on page 10.3.
• 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 8.4.
Toner smear • Clean the inside of the machine. See “Cleaning the
Inside” on page 8.2.
• Check the paper type and quality. See “Paper
Specifications” on page 10.3.
• Remove the toner cartridge and install a new one. See
“Replacing the Toner Cartridge” on page 8.4.
Vertical
repetitive
defects If marks repeatedly appear on the printed side of the
page at even intervals:
• The toner cartridge may be damaged. If a repetitive
mark occurs on the page, print a cleaning sheet several
times to clean the cartridge; see “Cleaning the Drum”
on page 8.5. After the printout, if you still have the
same problems, remove the toner cartridge and install
a new one. See “Replacing the Toner Cartridge” on
page 8.4.
• Parts of the machine may have toner on them. If the
defects occur on the back of the page, the problem will
likely correct itself after a few more pages.
• The fusing assembly may be damaged. Contact a
service representative.
• If you use inferior quality paper; see “Cleaning the
Drum” on page 8.5.
Condition Suggested solutions
AaBbCc
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Background
scatter Background scatter results from bits of toner randomly
distributed on the printed page.
• The paper may be too damp. Try printing with a
different batch of paper. Do not open packages of
paper until necessary so that the paper does not
absorb too much moisture.
• If background scatter occurs on an envelope, change
the printing layout to avoid printing over areas that
have overlapping seams on the reverse side. Printing
on seams can cause problems.
• If background scatter covers the entire surface area of
a printed page, adjust the print resolution through your
software application or the printer properties.
Misformed
characters • If characters are improperly formed and producing
hollow images, the paper stock may be too slick. Try a
different paper. See “Paper Specifications” on
page 10.3.
• If characters are improperly formed and producing a
wavy effect, the scanner unit may need service. For
service, contact a service representative.
Page skew • Ensure that the paper is loaded properly.
• Check the paper type and quality. See “Paper
Specifications” on page 10.3.
• Ensure that the paper or other material is loaded
correctly and the guides are not too tight or too loose
against the paper stack.
Curl or wave • Ensure that the paper is loaded properly.
• Check the paper type and quality. Both high
temperature and humidity can cause paper curl. See
“Paper Specifications” on page 10.3.
• Turn over the stack of paper in the tray. Also try
rotating the paper 180° in the tray.
Wrinkles or
creases • Ensure that the paper is loaded properly.
• Check the paper type and quality. See “Paper
Specifications” on page 10.3.
• Turn over the stack of paper in the tray. Also try
rotating the paper 180° in the tray.
Condition Suggested solutions
A
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaBbCc