The Backlight can be disabled to reduce battery usage.
From the READY screen or the TERMINAL SETUP REQUIRED prompt:
To navigate through the menus:
- Scroll down: press the 
 
 
 key 
 to move the highlight bar down.
- Scroll up: press the 
 
 
 key 
 to move the highlight bar up.
- Select a highlighted item: press the 
 
  key.
For 
 information about the keys...
1. Press the 
 
  key.
The MAIN MENU appears.
2. Scroll to ADMIN, and press the 
 
  key.
The ADMIN FUNCS menu appears.
3. Scroll to BACKLIGHT, and press the 
 
  key.
The BACKLIGHT menu appears.
4. Scroll to DISABLE, and press the 
 
  key 
 to turn the backlight off permanently.
The ADMIN FUNCS menu appears (and the backlight turns off).
5. Press the 
 
 
 key twice to return to the READY screen or the TERMINAL 
 SETUP REQUIRED prompt.