Epson EPL-5700 Reference Manual page 68

Clean the paper path inside the printer using a clean, soft, dry,
lint-free cloth.
Clean internal printer components by printing three pages with
only one character per page.
If the problem remains, replace the developer cartridge. For more
information, see "Replacing the developer 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 coarse, printed characters may
appear distorted or broken. Smooth, high-quality copier paper is
recommended for best results. See "Specifications" on page A-2
for information on choosing paper.
Completely blank pages
If, after checking the toner status in the EPSON Status Monitor 3,
the Toner LOW message indicates that the amount of toner is low,
see "Replacing the developer cartridge" on page 5-2.
To check that the photoconductor unit and the developer
cartridge are correctly installed, see "Replacing the developer
cartridge" on page 5-2.
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Troubleshooting