Epson EPL-N2000 User Manual page 19

Do not turn the cartridge upside down or stand it on its side.
Do not attempt to modify or take apart the cartridge; it
cannot be refilled.
Protect the cartridge's light-sensitive drum from exposure to
light any longer than necessary. Overexposing the drum
may cause abnormally dark or light areas to appear on the
printed page and reduce the service life of the drum. Also,
do not open the drum's protective cover.
Try not to touch the toner; if you accidentally touch the
toner, avoid contact with your eyes.
Do not use a cartridge for at least one hour after moving it
from a cool to a warm environment.
Introduction 13