Epson ActionLaser 1400 Reference Manual page 12

The toner cartridge is the part of the printer mechanism that
forms the image and transfers it onto the paper. Keep the
following guidelines in mind whenever you handle the toner
cartridge:
When removing the toner cartridge, avoid exposing it to
room light any longer than necessary. Exposure to light can
damage the drum, causing dark or light areas to appear on
the printed page and reducing the life of the drum. If you
need to keep the cartridge out of the printer for long
periods, keep it in a dark, dry place.
Do not turn the cartridge upside down or stand it on its
sides.
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.
To get the best print quality from your toner cartridge, do not
store it in locations that are subject to direct sunlight, dust, salty
air, or corrosive gasses (such as ammonia). Also avoid locations
subject to high temperatures or humidity or abrupt changes in
temperature or humidity.
6 Getting Started