Samsung SF-755P - Manual (Page 191)

T ROUBLESHOOTING 9.16
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 8.8.
Gray background If the amount of background shading becomes unacceptable:
• Change to a lighter weight pages. See “Paper Specifications”
on page A.9.
• 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 8.8.
Toner smear • Clean the inside of the machine. See page 8.4.
• Check the paper type and quality. See “Paper Specifications”
on page A.9.
• Remove the toner cartridge and install a new one. See
“Replacing the Toner Cartridge” on page 8.8.
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 8.9.
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 8.8.
• 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.
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