Printing quality problems – Samsung ML-6512ND-XAA User Manual
Page 92
Troubleshooting_ 92
Printing quality problems
If the inside of the machine is dirty or paper has been loaded improperly,
there might be a reduction in print quality. See the table below to clear the
problem.
The print quality
of photos is not
good. Images are
not clear.
The resolution of
the photo is very
low.
Reduce the photo size. If
you increase the photo size
in the software application,
the resolution will be
reduced.
Before printing,
the machine
emits vapor near
the output tray.
Using damp paper
can cause vapor
during printing.
This is not a problem. Just
keep printing.
The machine
does not print
special- sized
paper, such as
billing paper.
Paper size and
paper size setting
do not match.
Set the correct paper size in
the Paper tab in the Print-
ing Preferences (See
CONDITION
SUGGESTED SOLUTIONS
Light or faded print
•
If a vertical white streak or faded area
appears on the page, the toner supply is low
or the imaging unit is worn. You may be able
to temporarily extend the toner cartridge life
(See"Redistributing toner" on page 76). If this
does not improve the print quality, install a
new toner cartridge or imaging unit.
•
The paper may not meet paper specifications;
for example, the paper may be too moist or
rough (See "Print media specifications" on
•
If the entire page is light, the print resolution
setting is too low or the toner save mode is
on. Adjust the print resolution and turn the
toner save mode off. See the help screen of
the printer driver.
•
A combination of faded or smeared defects
may indicate that the imaging unit needs
cleaning (See "Cleaning the inside" on
•
The surface of the LSU part inside the
machine may be dirty (See "Cleaning the
Toner specks
A a
B b
C c
A a
B b
C c
A a
B b
C c
A a
B b
C c
A a
B b
C c
•
The paper may not meet specifications; for
example, the paper may be too moist or rough
(See "Print media specifications" on
•
The transfer roller may be dirty. Clean the
inside of your machine. Contact a service rep-
resentative.
•
The paper path may need cleaning. Contact a
service representative.
CONDITION
POSSIBLE
CAUSE
SUGGESTED SOLU-
TIONS
Dropouts
A a B b C
A a B b C
A a B b C
A a B b C
A a B b C
If faded areas, generally rounded, occur ran-
domly 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 "Print
media specifications" on page 110).
•
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
•
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 73).
•
The paper path may need cleaning (See
"Cleaning the inside" on page 73).
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-
If white vertical streaks appear on the page:
•
The surface of the LSU part inside the
machine may be dirty (See "Cleaning the
Color or Black
background
If the amount of background shading becomes
unacceptable:
•
Change to a lighter weight paper (See "Print
media specifications" on page 110).
•
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 99). If this problem persists, contact
a service representative.
CONDITION
SUGGESTED SOLUTIONS