Epson EPL-N1200 Reference Manual page 153

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" in Appendix A for information on choosing
paper.
Completely blank pages
If after checking the SelecType Toner option in the Setup
Menu, the Toner message indicates that the amount of toner is
low (E* F), read "Replacing the Imaging Cartridge" starting on
page 7-24.
Check that the imaging cartridge is installed as described in the
Getting Ready! booklet or in "Replacing the Imaging Cartridge"
later in this chapter.
The problem may be with your software program or interface
cable. Print out a status sheet. If blank pages continue to print,
the problem may be with the printer. Turn off the printer and
contact your dealer.
Printed image is light or faint
Darken the Density setting using the printer driver, Remote
Control Panel utility, or the SelecType Config Menu.
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Troubleshooting and Maintenance