NEC LT20 User Manual page 7

Warning- When the lamp reaches the end of its life, it will burn
out and may make a loud popping sound. If this
happens, the projector will not turn back on until the
lamp module has been replaced. To replace the lamp,
follow the procedures listed under "Replacing the
Lamp".
Do:
Turn off the projector before cleaning.
Use a soft cloth moistened with mild detergent to clean the
display housing.
Disconnect the power plug from AC outlet if the projector is
not being used for a long period of time.
Don't:
Block the slots and openings on the projector provided for
ventilation.
Use abrasive cleaners, waxes or solvents to clean the projector.
Use under the following conditions:
- In extremely hot, cold or humid environments.
- In areas susceptible to excessive dust and dirt.
- Near any appliance that generates a strong magnetic field.
- Place in direct sunlight.
Usage Notice
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... English