Service manual

Operating Manual SL6000 Series
Page 12 of 27
Mechanical radio operation
On/off volume
The On/Off volume is a potentiometer located on the top left-hand side of the radio.
Rotating the knob clockwise past the détente turns the radio on and increases the audio
volume up to the maximum volume level. Rotating the knob anti-clockwise decreases the
audio volume. Rotating the knob anti-clockwise past the détente will turn the unit off.
This volume knob also controls the volume to external speakers.
Accessories socket
The accessories connector (3.5mm stereo socket) allows for an external microphone
and/or external speaker. The connector also provides a means of programming via a PC
serial port.
Antenna socket
Care should be taken when removing or fitting the antenna. The socket is an SMA
connection. Do not over tighten when fitting the antenna.
Push buttons
The three buttons located on the left-hand side of the radio, are described as follows; from
top to bottom, they are: PTT (protruded dots raised profile), Monitor (raised profile).
Emergency (Orange with flush profile). They allow the following features:
PTT (Push to Talk)
PTT (Press to Talk) – This button enables the radio to transmit. Also used for enter button
when used with menu.
Monitor key (Squelch Defeat Operation)
By pressing the middle side button (monitor), the user can override the programmed
squelch operation and un-mute the speaker on the selected channel. Not only will activity
on that frequency be heard but ‘white noise’ will also be heard. When the user releases
the Monitor key, the radio will resume programmed squelch operation.
M
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