Samsung ML-6512ND User Manual page 90

CONDITION
Dropouts If faded areas, generally rounded, occur ran-
domly on the page:
A a B b C • A single sheet of paper may be defective.
Try reprinting the job.
A a B b C
• The moisture content of the paper is uneven
A a B b C
or the paper has moist spots on its surface.
Try a different brand of paper (See "Print
A a B b C
media specifications" on page 108).
A a B b C
• The paper lot is bad. The manufacturing pro-
cesses can cause some areas to reject
toner. Try a different kind or brand of paper.
• Change the printer option and try again. Go
to Printing Preferences, click Paper tab,
and set type to Thick (See "Opening printing
preferences" on page 50).
• If these steps do not correct the problem,
contact a service representative.
White Spots If white spots appear on the page:
• The paper is too rough and a lot of dirt from a
paper falls to the inner devices within the
machine, so the transfer roller may be dirty.
Clean the inside of your machine (See
"Cleaning the inside" on page 71).
• The paper path may need cleaning (See
"Cleaning the inside" on page 71).
Vertical lines If black vertical streaks appear on the page:
• The surface (drum part) of the imaging unit
inside the machine has probably been
scratched. Remove the imaging unit and
install a new one (See "Replacing the imag-
ing unit" on page 97).
If white vertical streaks appear on the page:
• The surface of the LSU part inside the
machine may be dirty (See "Cleaning the
inside" on page 71).
Color or Black If the amount of background shading becomes
background unacceptable:
• Change to a lighter weight paper (See "Print
media specifications" on page 108).
• Check the environmental conditions: very
dry conditions or a high level of humidity
(higher than 80% RH) can increase the
amount of background shading.
• Remove the old imaging unit and, install a
new one (See "Replacing the imaging unit"
on page 97). If this problem persists, contact
a service representative.
SUGGESTED SOLUTIONS CONDITION
Toner smear
Vertical repetitive
defects
Background scat-
ter
A
Toner particles are
around bold char-
acters or pictures
Troubleshooting_ 90
SUGGESTED SOLUTIONS
If toner smears on the page:
• Clean the inside of the machine (See "Clean-
ing the inside" on page 71).
• Check the paper type and quality (See "Print
media specifications" on page 108).
• Remove the imaging unit and then, install a
new one (See "Replacing the imaging unit"
on page 97).
If marks repeatedly appear on the printed side of
the page at even intervals:
• The imaging unit may be damaged. If you
still have the same problem, remove the
imaging unit and, install a new one (See
"Replacing the imaging unit" on page 97).
• 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. Con-
tact a service representative.
Background scatter results from bits of toner
randomly distributed on the printed page.
• The paper may be too damp. Try printing
with a fresh ream of paper. Do not open
reams 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 sur-
face area of a printed page, adjust the print
resolution through your software application
or in Printing Preferences (See "Opening
printing preferences" on page 50).
The toner might not adhere properly to this type
of paper.
• Change the printer option and try again.
Go to the Printing Preferences, click the
Paper tab, and set the paper type to Recy-
cled.