Nortel Networks 822p 用户手册

Clean the lens whenever you notice dirt or dust on the surface. 

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Use a canister of compressed air to remove dust. 

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To remove dirt or smears on the lens, use lens-cleaning paper. If 
necessary, moisten a soft cloth with lens cleaner and gently wipe 
the lens surface.

Before you clean the case, first turn off the projector and unplug the 
power cord. 

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To remove dirt or dust, wipe the case with a soft, dry, lint-free 
cloth. 

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To remove stubborn dirt or stains, moisten a soft cloth with water 
and a mild detergent. Then wipe the case. 

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Do not use wax, alcohol, benzene, paint thinner, or other 
chemical detergents. These can damage the case.

Your projector includes an air filter to ensure the best performance. If 
dust collects on the air filter or vent on the bottom of the projector, 
clean them as described below. Dust clogs prevent proper ventilation 
and can cause overheating and damage the projector.

When the filter and vent are clogged, the projector displays the 
message 

The projector is overheating. Make sure nothing is 

blocking the air vent, and clean or replace the air filter.