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How do I clean my projector lens?

How should I choose a projection screen?

How to replace the projector lamp and reset the lamp timer?

How do I use a RS232 cable to power on or power off the projector?

How do I use a RS232 cable to control the volume and sound on the projector?

My remote control is not working. What can be done to fix it?

When projector is in operation, why is the power LED not lit up?

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