Epson EPL-N2000 Reference Manual page 24

Protect the light-sensitive drum from exposure to light. Avoid
exposing the imaging cartridge to room light any longer than
necessary. Do not open the drum's protective cover.
Overexposing the drum may cause abnormally dark or light
areas to appear on the printed page and reduce the service life
of the drum.
When handling the cartridge, always set it on a clean, smooth
surface.
Do not attempt to modify or take apart the cartridge. It cannot
be refilled.
Try not to touch the toner and avoid all contact with
your eyes.
Do not use a cartridge for at least one hour after moving it
from a cool to a warm environment.
14
Getting Started