Optoma TW675UST-3D User Manual page 75

If the Interactive pen does not work
Check the input source is PC (VGA, HDMI, Wireless and LAN

source)
Check the Interactive function is turned On.

When using Wireless or LAN connection, and the Pen does not

work, check if the Wireless/Network function is turned On.
If more than one Pen point toward the screen at the same time,

none can function.
Check the Nib, If the Nib is worn out, replace with a new Nib.

Make sure the batteries are inserted correctly.

Replace batteries if they are exhausted.

Make sure there are not any obstructions between the Interactive

pen and the projector. Move to within 10m (0°) / 8m (20°) / 5m
(45°) of the projector.
Appendices
75
English