Optoma HD90 - Manual (Page 51)

51
English
Appendices
Other Problems
The projector stops responding to all controls
If possible, turn off the projector, then unplug the power cord `
and wait at least 20 seconds before reconnecting power.
Remote Control Problems
If the remote control does not work
Check the operating angle of the remote control is within ±25° `
both horizontally and vertically of on of the IR receivers on the
projector.
Make sure there are not any obstructions between the remote `
control and the projector. Move to within 6 m (20 ft) of the
projector.
Make sure batteries are inserted correctly. `
Replace batteries if they are exhausted. `