PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100
Page 2-5
Rev. 3, Dec. 2015
The audio low for unswitched #4 (J2, pin 15) should be connected to a convenient audio low. However, this
should NOT be connected to Music Low.
Unswitched #1 is presented to the pilot headphone in fail-safe (off) mode.
NOTE
Inputs 1, 2 and 4 are fixed (1:1), and any audio level adjustments must be made at the input source.
Unswitched #3 has a variable adjustment control located on the bottom side of the unit. This control allows
you to adjust the volume level of that unswitched input. Refer to Adjustments section.
The front panel jack can be configured to act as a fifth unswitched input. When connected to an audio alert
source, the input to this jack will be presented to the pilot and copilot headsets, and not muted.
NOTE
The front-mounted utility jack is intended for portable equipment that is advisory in nature. It is NOT
INTENDED for use as a primary warning channel. Audio of importance MUST ALWAYS be hard-wired
into the unswitched inputs of the audio panel.
2.5 Intercom wiring
See Appendix C and D for intercom connection configurations. It is critical to the proper operation of this
system to have this connector wiring made in accordance with these diagrams. Use 2- and 3-conductor,
MIL-spec cable as shown. Connect the shields at the audio panel end only, and tie to the audio low inputs
as shown.
NOTE
The intercom harness can be custom made by PS Engineering, Inc. Simply call the factory or
www.ps-
engineering.com
to obtain a wire harness work sheet. The harness will be made to your specifications and
fully functionally tested. Harness can be ordered with jack, or without the intercom jacks installed, for easi-
er wire routing through the aircraft.
2.5.1
Entertainment Inputs
The PMA5000EX has two INDEPENDENT music inputs, PLUS a front mounted jack that is connected to
Entertainment 1. Entertainment input number 1 is J2 pins 23 (left channel) and 24 (right channel), with
respect to pin 25, and Entertainment number 2 is connected to 26 (left channel), 27 (right channel), with
respect to 28.
NOTE
Use the low level output of any additional entertainment device to connect to the au-
dio panel. Maximum signal level is
3 VAC
p-p.
DO NOT
use a speaker-level output,
this will cause internal damage in the audio panel.
2.5.2
Entertainment muting
The PMA5000EX-system incorporates a "Soft Mute™" system. This will mute the entertainment devices
during ICS or radio conversation. See
Section 3.7
for more information.
Any signal appearing in the hard wired unswitched audio inputs will always mute the entertainment
sources, even though the passengers may not hear the audio tone itself.
Press the
Mute
switch to activate the four Karaoke modes (disabling crew SoftMute™). This allows the
pilot to place the entertainment into the background while having the radios in the foreground. This elimi-
nates the constant interruption of the music while still having the radios a priority.
CAUTION
Local oscillators and internal signals from entertainment equipment can cause undesired interference with
other aircraft systems. Before takeoff, operate the entertainment devices to determine if there is any adverse
effect within the aircraft systems. If any unusual operation is noted in flight, immediately switch off the
entertainment devices.
All additional entertainment devices must be switched off for both takeoff and landing.