Epson EPL-N2750 Reference Manual page 182

Clean the paper path inside the printer with a clean, soft, lint-free
cloth.
Clean internal printer components by printing several pages with
only one character per page.
There may be a problem with the imaging cartridge. Remove the
cartridge, shake it from side to side, and then reinstall it. If this
does not solve the problem, replace the imaging cartridge as
described in "Replacing the Imaging Cartridge" on page 5-2.
Horizontal black or white bands appear in your printout, or the
printer prints a blank page
Install a new imaging cartridge as described in "Replacing the
Imaging Cartridge" on page 5-2.
Uneven darkness
Take out the imaging cartridge, shake it from side to side, and
reinstall it.
Your paper may be moist or damp. Printing is sensitive to
moisture absorbed by the paper. Do not store your paper in a
humid or damp environment.
Install a new imaging cartridge as described in "Replacing the
Imaging Cartridge" on page 5-2. Then print several pages to check
the print quality.
Toner smudges
Remove the imaging cartridge, shake it from side to side to
distribute the toner, and wipe the bottom of it with a clean, dry
cloth.
Clean the paper path inside the printer using a clean, soft, lint-
free cloth.
Troubleshooting
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