Optoma DS550 User Manual page 3

8. Replacement parts
When replacement parts are required, be sure that the replacement
parts are specified by the manufacture. Unauthorized substitutions may
result in fire, electric shock or other hazards.
9. Moisture Condensation
Never operate this projector immediately after moving it from a cold
location to a warm one. When the projector is exposed to such a
change in temperature, moisture may condense on the lens and the
crucial internal parts. To prevent the unit from possible damage, do not
use the projector for at least 2 hours when there is an extreme or
sudden change in temperature.
EN-3