Acer H6800 User Manual page 9

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Do not use lens cap when projector is in operation.
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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, contact your local dealer or Acer
service center.
Cleaning the lens
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Before cleaning the lens, be sure to turn off the projector and unplug the
power cord to allow the projector to cool down for at least 30 minutes.
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Use a compressed air tank to remove the dust.
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Use a special cloth for cleaning lens and gently wipe the lens. Do not touch
the lens with your fingers.
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Do not use alkaline/acid detergents or volatile solvents such as alcohol for
cleaning lens. If the lens is damaged due to the cleaning process, it is not
covered by the warranty.
Warning:
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Do not use a spray containing flammable gases to remove dust or dirt from the lens.
This may cause a fire due to excessive heat inside the projector.
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Do not clean the lens if the projector is warming up as this may cause the lens' surface
film to peel off.
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Do not wipe or tap the lens with a hard object.
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