Optoma TH7500 User Manual page 56

Appendices
56
English
On Screen Messages
Temperature warning:

Fan failed:

Lamp warning:

Out of display range:

If the remote control does not work
Check the operating angle of the remote control is within ±15°

both horizontally and vertically of one of the IR receivers on the
projector.
Make sure there are not any obstructions between the remote

control and the projector. Move to within 7 m (±0°) of the projector.
Make sure the batteries are inserted correctly.

Replace batteries if they are exhausted.

Ensure that you have set your remote to the correct IR code set

(see page 47).