Epson AcuLaser C1900 Reference Manual page 17

Do not dispose of used developer cartridges, waste toner
collectors or photoconductor units in fire, as they can explode
and cause injury. Dispose of them according to local
regulations.
Wait at least one hour before using a developer cartridge or
a photoconductor unit after moving it from a cool to a warm
environment to prevent damage from condensation.
When removing the photoconductor unit, avoid exposing it
to light for more than 5 minutes. The unit contains a
green-colored light-sensitive drum. Exposure to light can
damage the drum, causing dark or light areas to appear on
the printed page and reducing the service life of the drum. If
you need to keep the unit out of the printer for long periods,
cover it with an opaque cloth.
Be sure not to scratch the surface of the photoconductor unit's
drum. When you remove the photoconductor unit from the
printer, always place the unit on a clean, smooth surface.
Avoid touching the drum, since oil from your skin can
permanently damage its surface and affect print quality.
To get the best print quality, do not store the photoconductor
unit in an area subject to direct sunlight, dust, salty air, or
corrosive gases (such as ammonia). Avoid locations subject to
extreme or rapid changes in temperature or humidity.
Be sure to keep all consumable components out of the reach
of children.
Do not leave jammed paper inside the printer. This can cause
the printer to overheat.
Avoid sharing outlets with other appliances.
Use only an outlet that meets the power requirements of this
printer.
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