BURY AC 5120 User manual

AC 5120
Audio Switchbox

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1. Scope of supply
2. Installation instructions
With the AC 5120 speaker switchbox, you get the possibility of being able to mute the feedback of your
car radio / CD player etc. and to transfer the voice output of your conversation partner during a tele-
phone call to your vehicle’s speakers. This means that the installation of additional speakers isn‘t re-
quired. If your radio has a mute function, then the vehicle speakers are turned onto mute using the
radio. If your car radio doesn‘t have this function, then the signals will be suppressed by the speaker
switchbox. You can use the AC 5120 through the connections that your BURY hands free car kit offers,
which guarantee voltage supply via molex plugs and also have a speaker output.
If you want to make a telephone call in the hands-free mode, your car radio will be automatically swit-
ched on to mute (for the exact operation of your hands free car kit, please read your HFCK user ma-
nual). The Audio switchbox now uses one or two loudspeakers in your car for the telephone conversa-
tion, even if your radio is switched off. This function will be automatically activated after the installati-
on of the unit, there are no subsequent manual settings required.
Some mobile phones do not support a radio mute function. Please read your telephone user manual
for more details. You can find out more detailed information at your specialist retailer, in the internet
under www.bury.com, or over our telephone hotline.

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After checking that all the cable lengths are sufficient, decide where you are able to attach the Audio
switchbox. Now secure the Audio switchbox so that it isn’t able to flap about and/or rattle against other
parts of your vehicle.
Now connect the audio switchbox plug (1) to the hands-free car kit. (The other, smaller box is used by
the audio switchbox plug for the microphone.) Now connect the white power out cable connector (2)
of your Audio switchbox to the power supply socket of your hands-free kit.
Now disconnect the (a) and/or the (b) loudspeaker connector from the speaker socket on the radio at
the back. Connect this connector with the suitable socket (3) on the AC 5120. Now connect the plug
(4) with the radio.
Depending on the switcher position (5), the voice of your conversation partner will be fed back through
either the front right speaker, the front left speaker, or through both of the front loudspeakers. The
‘OFF’ position is to be selected if you connect the switchbox to the radio using the ‘Phone-IN’ cable
(6).

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The two ‘Phone-In’ cables are marked accordingly and must be plugged into the appropriate con-
nections on the radio (blue, green or yellow). In this regard, please refer to the instructions
concerning the connection configuration of your car radio in your car radio handbook. In lots of
radios, the volume level (feedback of your conversation partner) can be controlled via the phone
input and the selection of the loudspeaker.
Different connections of the ISO plug on the radio
The layout of the pins on the ISO plug used in a car depends on the type of car. Before using the
switchbox, you should make sure that the connections are correct in order to prevent possible
damage to the device.
Configuration I
If the assignment of pin 7 of the ISO plug is connected to the DC Power Supply, and pin 4 is
connected to the ignition, you should check if the connection looks like the connection presented
on the drawing below.
Switchbox Vehicle
red 7 (red)
blue 4 (blue)

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Configuration II
If the assignment of pin 7 of the ISO plug is connected to the ignition, and pin 4 is connected to the
DC power supply, the connection of the cables should look like the connection presented on the dra-
wing below.
In the operating manual of the radio device, you can find the pin assignment for the “mute” signal. This
signal can occur on one of three cables marked with “mute1”, “mute2”, or “mute3”.
Connect the yellow “mute” cable to the switchbox using the correct cable from the car radio: “mute 1”,
“mute 2” or “mute3”.
ATTENTION:
The positive wires and ignition wires are protected in the casing of the switchbox with
3A fuses.

red 7 (red)
blue 4 (blue)
Switchbox
red 7 (red)
blue 4 (blue)
Switchbox
Vehicle
Vehicle
mute 1
radio device Switchbox
mute 2
mute 3
mute (yellow)