On/Off Knob / Volume Control; Keypad Lock: Apx 6000 Only - Motorola APX 4000 Manual

ON / OFF & VOLUME CONTROL:

KEYPAD LOCK: APX 6000 only

The large knob located on top of the radio opposite of the antenna is used to turn the
radio on or off. A "click" will be felt when the knob has been rotated far enough to
either power the radio up or turn it off. Continuing to turn the knob clockwise once the
radio has powered up will adjust the volume; the further the knob is turned clockwise, the
louder the speaker output will be.
Once the radio has been powered up, the display will read "SELFTEST" and it will
automatically affiliate with a tower. The radio will remember the talk-group it was last
tuned to prior to being powered down and will attempt to affiliate with this talk-group.
Adjacent to the on/off/volume knob is a small three-position
switch labeled A B C. This switch can do different things
depending on how the radio is programmed. On the Franklin
County/CoMIRS radios, this switch has been programmed as a
Keypad Lock switch. When placed in the "C" position the keypad
is locked. When the switch is in the "A" or "B" position the
Keypad is unlocked.