Getting Started
 19
Press and hold the Rotary knob to lock it, press and hold it again to 
unlock. Powering Off also unlocks a locked Rotary knob.
Emergency Button
Press and hold this button to enter Emergency Operation.
When the MTH800 is powered down, press and hold this button to 
power On in Emergency Operation (if configured by your Service 
Provider).
See “Emergency Operation” on page 54.
Function Keys 
Side Keys
The Rotary knob and Side key programming are paired:
When the Rotary knob is programmed to Volume Control or 
Dual Control, the Side keys support the one-touch feature 
that allows you to select or activate commonly used features 
by pressing and holding a single key. By default, the upper 
side key is set to “Backlight On/Off” and the lower side key is 
set to “Screen Saver On”. Please check with your Service 
Provider.
For information on the function assigned to each Side or Numeric key, 
please refer to your Service Provider.
The required time you need to press the Side or Numeric keys to activate a 
one-touch function is set as default to 1 second. This time may be set, how-
ever, by your Service Provider.
Rotary Knob Programming Side Key Programming
Dual Control Programmed to a one-touch function
List Control
: Volume Up
: Volume Down
Volume Control Programmed to a one-touch function
6802972C35.book  Page 19  Monday, August 16, 2004  9:22 PM