Hiding The Image; Locking Control Keys; Operating In A High Altitude Environment - BenQ MX819ST User Manual

Hiding the image

In order to draw the audience's full attention to the presenter, you can use ECO BLANK
on the projector or remote control to hide the screen image. When this function is
activated with an audio input connected, the audio can still be sheard.
You can set the blank time in the SYSTEM SETUP: Basic > Operation Settings >
Blank Timer menu to let the projector return the image automatically after a period of
time when there is no action taken on the blank screen.
If the preset time spans are not suitable for your presentation, select Disable.
No matter Blank Timer is activated or not, you can press most of the keys on the
projector or remote control to restore the picture.

Locking control keys

With the control keys on the projector locked, you can prevent your projector settings
from being changed accidentally (by children, for example). When the Panel Key Lock is
on, no control keys on the projector will operate except
1. Go to the SYSTEM SETUP: Basic > Panel Key Lock menu, and select On by
pressing
displays.
2. Highlight Yes and press MODE/ENTER to confirm.
To release panel key lock, use the remote control to enter the SYSTEM SETUP: Basic
>
Panel Key Lock menu and press
• Keys on the remote control are still active when panel key lock is enabled.
• If you turn off the projector without disabling panel key lock, the projector will still be in locked status the
next time it is turned on.

Operating in a high altitude environment

We recommend you use the High Altitude Mode when your environment is between
1500 m –3000 m above sea level, and ambient temperature is between 0°C–30°C.
Do not use the High Altitude Mode if your altitude is between 0 m and 1500 m and ambient temperature is
between 0°C and 35°C. The projector will be over cooled, if you turn the mode on under such a condition.
To activate the High Altitude Mode:
1. Press MENU/EXIT and then press
menu is highlighted.
2. Press
confirmation message displays.
3. 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 over-
heating. In cases like this, you should switch to High Altitude mode to solve these
symptoms. However, this is not to state that this projector can operate under any and all
harsh or extreme conditions.
/ on the projector or remote control. A confirmation message
to highlight High Altitude Mode and press
Off
/ to select .
/ until the SYSTEM SETUP: Advanced
POWER.
/ select On. A
Operation 33