Samsung ML-4551N - Manual (Page 57)

9.12
<Troubleshooting>
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 page 8.3. After the printout, if
you still have the same problems, install a new
toner cartridge. See page 8.5.
• Parts of the printer 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.
Background
scatter Background scatter results from bits of toner
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
via the printer properties window.
Misformed
characters • If characters are improperly formed and
producing hollowed images, the paper stock
may be too slick. Try a different paper. See
page 5.3.
• If characters are improperly formed and
producing a wavy effect, the scanner unit may
need service. Verify that it also occurs on a
demo page (see page 2.8). For service,
contact a service representative.
Page skew • Ensure that the paper is loaded properly.
• Check the paper type and quality. See page
5.2.
• Ensure that the paper or other media is loaded
correctly and the guides are not too tight or
too loose against the paper stack.
Condition Suggested solutions
AaB bC c
AaB bC c
AaB bC c
AaB bC c
AaB bC c
A
AaBbCc
AaBbC
c
AaBbCc
AaBbCc
AaBbCc
Curl or wave • Ensure that the paper is loaded properly.
• Check the type and quality. Both high
temperature and humidity can cause paper
curl. See page 5.2.
• Turn over the stack of paper in the tray. Also
try rotating the paper 180° in the tray.
• Try printing to the rear cover (face-up).
Wrinkles or
creases • Ensure that the paper is loaded properly.
• Check the paper type and quality. See page
5.2.
• Open the rear cover and try printing to the rear
cover (face-up).
• Turn over the stack of paper in the tray. Also
try rotating the paper 180° in the tray.
Back of
printouts are
dirty • The transfer roller may be dirty. See page 8.1.
• Check for leaking toner. Clean the inside of
the printer.
Solid color or
Black pages • The toner cartridge may not be installed
properly. Remove the cartridge and reinsert.
• The toner cartridge may be defective and
need replacing. Install a new toner cartridge.
• The printer may require repair. Contact a
service representative.
Loose toner • Clean the inside of the printer.
• Check the paper type and quality. See page
5.2.
• Install a new toner cartridge. See page 8.5.
• If the problem persists, the printer may require
repair. Contact a service representative.
Condition Suggested solutions
A