Epson EPL-N2000 User Manual page 20

Avoid touching the glass in front of the laser beam;
otherwise, print quality may decline.
glass
To get the best print quality, do not store the imaging
cartridge in an area subject to direct sunlight, dust, salty air,
or corrosive gasses (such as ammonia). Avoid locations
subject to high temperatures or humidity, or abrupt changes
in temperature or humidity. Also, be sure to keep the
cartridge out of the reach of children.
14 Introduction