Identifying Radio Controls
English
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The main display only shows the icon of secondary feature; the 
main display does not show the icon of primary feature. 
The radio by default is set to use the primary feature. Short 
presses of MFK toggle it to work on either the secondary or 
primary feature. 
The secondary feature has an inactivity timer. This timer starts 
when the secondary feature is left idle. Your radio returns to 
primary feature when this timer expires. 
If the MFK is set to operate only one feature besides On/Off the 
radio, Volume Change should be the only feature applied to 
MFK. 
Consult your dealer or system administrator for the best options 
available for MFK. 
APX_4000_M3.book  Page 15  Thursday, March 13, 2014  10:59 AM