Hitachi CP-TW2505 User Manual page 157

Phenomena that may be easy to be mistaken for machine defects (continued)
Phenomenon Cases not involving a machine defect
There may be obstacles in between the interactive pen
and sensors (Camera) on the projector.
The way of you hold the pen or your position may affect
the system.
The LiveViewer may not display the annotations that
are made by Starboard Software.
IN HDMI
Is ambient light falling on the screen?
Other than the above
Troubleshooting
Reference
COMPUTER
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