How to Check IR Transmitter of Not Working Remote?

When your projector is not working, this solution could get it fixed.

Remote Control Troubleshooting

If a projector cannot be controlled with the remote control, please check the following:

Check the batteries in the remote control to ensure that they are good and that they are
installed properly.
Confirm that the Main Power Supply switch on the Projector is turned ON.
Check the IR transmitter via digital image (cell phone, digital camera, etc.):

Point the remote control IR transmitter towards a digital camera or cell phone camera (as shown in Figure 2).
Press the Power button on the remote control and you should see the light from the IR transmitter flashing as you depress the button (see arrow in figure).
If the light is observed, the IR transmitter is working properly. Continue troubleshooting with the next step.
If the light is NOT observed, the IR transmitter is NOT working properly. You must resolve the problem with the batteries or obtain a new remote control.