Operating in a high altitude environment
We recommend that you activate High Altitude Mode when your environment is higher than 1500 meters (around 4920 feet) above sea level, or whenever the projector will be used for extended periods of time (>10 hours) without shutdown.
To activate High Altitude Mode:
1.Press MENU/EXIT and then press 
/ 
until the Advanced Setup menu is highlighted.
2.Press 
to highlight High Altitude Mode.
3.Press 
/ 
to select On. A confirmation message displays.
4.Highlight Yes and press MODE/ENTER.
Operation under High Altitude Mode may cause a higher decibel operating noise level because of increased fan speed necessary to improve overall system cooling and performance.
If you use this projector under other extreme conditions excluding the above, it may display auto shut- down symptoms, which is designed to protect your projector from