Epson 1500 - Manual (Page 62)

Uneven darkness
Take out the imaging cartridge, shake it from side to side, and
then 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.
If this does not solve the problem, install a new imaging
cartridge as described at the end of this chapter. 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, dry
cloth.
Clean internal printer components by printing three pages with
only one character per page.
If the problem remains, replace the imaging cartridge as
described at the end of this chapter.
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.
3-10 Troubleshooting