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There is no filter to clean according to the manual. They suck clean air into the keep the electronics cool, channel it into the cooking cavity, pick up steam and smells and vent it out untreated.
The Optoma HD20P doesn't have an air filter.
If you remove the covers you will find 2 cooling fans that get a build up of dust on the leading edges of the fan blades.
These can easily be cleaned with a small paint brush and a drinking straw to blow out the excess dust.
If you are having overheating problems, please view my post on replacing the heat sink compound on the image processor.
if your projector often make overtemperature protection, you have to inspect the air filter,whether it is still clean, otherwise, you need to replace it.
if the lamp, lamp driver,power supply,Scaler Board and Formatter Board were good.
perhaps it is over temperature protection.
whether you checked with the air filter( dust filter) is clean or dirty?
The replacement of the filter is something that needs to be done at a service center by a trained technician. If you are interested, feel free to send us a message: Projector Repair Bulb Replacement
Try cleaning the filter. If the area where it is installed is enclosed this will also cause over heating.. Make sure you have adequate air flow in the place where it is located and clean the filter.
Possible filter problem since its overheating. clean up filters and make sure that you use projector in an open area so air can cool it off while running.
ALSO CHECK YOUR FAN. IF THE FAN OR A HEAT SINK IS NOT WORKING PROPERLY (I.E. THE FAN MAY JUST NEED TO BE CLEANED OR REPLACED, THERE SHOULD BE A SMALL HEAT SINK. IF CLOUDED W/DUST, IT WILL KEEP THE OPERATION SHORT). ALSO CHECK IF YOU HAVE SET ANY TEMPERATURE SHUTDOWN PARAMETERS. IF YOUR LAMP HEATS UP FOR SO LONG AND REACHES A TEMPERATURE THAT WILL AFFECT THE CIRCUITS, THIS OF COURSE WILL SHUT DOWN YOUR UNIT UNEXPECTEDLY. HOPE THIS HELPS...JGUAM
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