ViewSonic PJL7201 User Manual page 58

Troubleshooting
Error For Machine Defects
Symptom
No audio
Remote control is
not working.
ViewSonic
The projector is not connected correctly.
Check audio cable if connect correctly.
The volume is set to minimum.
Adjust the volume.
Mute is turned on.
Press the MUTE button.
No battery.
Before using the remote control, please check the battery of remote
control.
Remote signal is obstructed.
Remove the obstacle between projector and remote control.
Cause / Remedy
 PJL7200/PJL7201/PJL7202