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Motorola ASTRO APX O2 Control Head Mobile Radio User Manual: Home Button; Dimmer Button; Multi-function Knob; The Mfk Button On Your Radio Is Programmable To The Following Features

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Home Button

button returns you to the home (default) display. In most
cases, this is the current mode.
For selected radio features, the
user-edited radio settings or information before returning you to
the Home screen.
Some features do not require you to press
the Home screen. Refer to the individual feature
sections in this manual for further details on saving
user-edited radio settings or information.
button also can revert to home channel from any other
zone and mode in the radio. Check with your dealer or system
administrator for more information.

Dimmer Button

Use this button to adjust the brightness of the display. Long
press to toggle between day and night mode.
button is also used to save
to go to

Multi-function Knob

The MFK button on your radio is programmable to the
following features :
Mode Change
- Press the MFK once and turn clockwise
to scroll the channel list.
Volume Change
-Turn the MFK clockwise or
counterclockwise to adjust the volume level of the speaker.
The volume level can be adjusted in 16 steps or 32 steps. A fast
turn of the MFK adjusts the volume level in 16 steps with large
increments in volume level. A slow turn of the MFK adjusts the
volume level in 32 steps with small increments in volume level.
The display shows the volume level and bars to indicate the
current level. The level of last selected volume when your radio
powers down remains the same when the radio powers up.
The main display shows the icon of the secondary feature.The
main display does not show the icon of primary feature.
Your radio by default is set to use the primary feature. Short
press the MFK to toggle it to work on either the secondary or
primary feature.
The concentric ring LED on the MFK will blink in green when the
knob is set to secondary feature.



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