Samsung ML-4551ND - Manual (Page 57)

9.11
<Troubleshooting>
Solving print quality problems
Dirt inside of the printer or improper paper loading may reduce print
quality. See the table below to troubleshoot problems.
Condition Suggested solutions
Light or faded
print If a vertical white streak or faded area appears
on the page:
• The toner supply is low. You may be able to
temporarily extend the toner cartridge life. See
page 8.4. If this does not improve print quality,
install a new toner cartridge.
• The paper may not meet paper specifications
(for example, the paper is too moist or too
rough). See page 5.3.
• If the entire page is light, the print resolution
setting is too light or toner save mode is on.
Adjust the print resolution and toner save
mode in the printer properties. See the
Software Section.
• If the entire page is faded with "Toner Low
Replace Toner" message on LCD,
set "CLR Empty Msg." to "On" referring to
page 8.7. In this case, you can keep printing
but the quality cannot be guaranteed, and the
product support is no longer provided.
• A combination of faded or smeared defects
may indicate that the printer needs cleaning.
See page 8.1.
• The surface of LSU may be dirty. Clean the
LSU. See page 8.2.
Toner spots • The paper may not meet specifications (for
example, the paper is too moist or too rough).
See page 5.3.
• The transfer roller or paper path may be dirty.
See page 8.1.
Aa Aa B b B b C c C c
Aa Aa B b B b C c C c
Aa Aa B b B b C c C c
Aa Aa B b B b C c C c
Aa Aa B b B b C c C c
Aa Bb Cc
Aa Bb Cc
Aa Bb Cc
Aa Bb Cc
Aa Bb Cc
Dropouts If generally rounded, faded areas 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 page 5.3.
• 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 the next page.
• If these steps do not correct the problems,
contact a service representative.
Vertical lines If black vertical streaks appear on the page:
• The drum inside the toner cartridge has
probably been scratched. Install a new toner
cartridge. See page 8.5.
If white vertical streaks appear on the page:
• The surface of the LSU part inside the printer
may be dirty. Clean the LSU. See page 8.2.
Gray
background If the amount of background shading becomes
unacceptable, the procedures below may fix the
problem.
• Change to lighter weight pages. See page 5.3.
• Check the printer’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 page 8.5.
Toner smear • Clean the inside of the printer. See page 8.1.
• Check the type and quality. See page 5.2.
• Remove the toner cartridge and install a new
one. See page 8.5.
Condition Suggested solutions
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaB bC c AaB bC c
AaB bC c
AaB bC c
AaB bC c
AaB bC c
AaB bC c AaB bC c
AaB bC c
AaB bC c
AaBbCc
AaBbCc
AaBbCc
AaBbCc
AaBbCc