Installation manual

AMX240 Audio Panel Installation Manual
200-890-0240 Rev. 02
Cellular telephones installed in or carried aboard airplanes, balloons or any other type of aircraft must not be operat-
ed while such aircraft are airborne (not touching the ground). When any aircraft leaves the ground, all cellular tele-
phones on board that aircraft must be turned off.
Avidyne Corporation. does not endorse using unapproved cellular telephone equipment in flight, and takes no re-
sponsibility for the user’s action.
2.4.9 Public Address Mode
By holding SPKR pushbutton for more than 2 seconds, the AMX240 will be placed into public address (PA) mode.
In this mode, the pilot will be talking over the cockpit speaker when he presses his PTT switch. Copilot will still
continue on the selected COM radio. The SPKR label will blink green when the PA is on.
To deselect the PA, either press the SPKR for more than 2 seconds or just simply cycle power on the audio panel.
When the discrete Output is enabled, J2 Pin 19 will go low when in PA mode, providing a logic level that can be
used to incorporate a speaker-switching scheme. This 50 mA circuit (10Ω Z) can control a switching means such as
a relay that would transfer the speaker output amplifier from the cockpit speaker to drive another cabin speaker. If
the PA mode is used with a microphone in proximity to an active cockpit speaker, feedback might result.
To enable the PA discrete Output located at the rear connector, the internal configuration jumper, J4, MUST be
placed across both pins in the header. This jumper is shipped as open from the factory.
2.4.9.1 Public Address Output Jumper
1. Remove qty. 4 Phillip head screws from the unit. NOTE: THE SCREW IN THE REAR OF THE
PANEL IS A DIFFERENT LENGTH THAN THE OTHER FOUR. YOU MUST PUT THE
SHORTER LENGTH SCREW BACK IN THE SAME LOCATION OR DAMAGE WILL OCCUR.
See Figure #1.
Figure 2-2 Screw Locations
2. Move the blue jumper located in the back corner near the sub-D connectors on both pins of J4. See Figure
#2-3.
Long shaft screws