Epson EPL-N2750 Reference Manual page 183

Clean internal printer components by printing several pages with
only one character per page.
If the problem remains, replace the imaging cartridge as described
in "Replacing the Imaging Cartridge" on page 5-2.
Missing areas on printed image
Your paper may be moist or damp. Printing is sensitive to
moisture absorbed by the paper. The higher the moisture content
in the paper, the lighter the printed output. Do not store your
paper in a humid or damp environment.
You may not be using the correct type of paper for your printer.
If the surface of your paper is too rough, printed characters appear
distorted or broken. Smooth, high-quality copier paper is
recommended for best results. See "Paper Specifications" on page
A-2 for information on choosing paper.
Completely blank pages
Check the Toner function in the SelecType Setup Menu. If the
Toner message indicates that the amount of toner is low (E* F),
replace the imaging cartridge as described in "Replacing the
Imaging Cartridge" on page 5-2.
Check that the imaging cartridge is installed as described in
"Replacing the Imaging Cartridge" on page 5-2.
The problem may be with your application software or interface
cable. Print out a status sheet by pushing the Enter button on the
control panel twice while the printer is online. If the status sheet
is also blank, the problem may be with the printer. Turn off the
printer and contact your dealer or a qualified service
representative.
6-16
Troubleshooting