PS Engineering
PMA7000B Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0004 Page 2-7 Feb. 2004
NOTE: Use the low level output of any additional entertainment device to connect to
the audio panel. Maximum signal level is 2 VAC p-p.DO NOT use a speaker-level
output, this will cause internal damage in the audio panel.
2.4.15.1.1 Entertainment muting
The PMA7000B-system incorporates a "Soft Mute" system. This will mute the entertainment devices dur-
ing ICS or radio conversation.
Any signal appearing in the unswitched audio inputs will always mute the entertainment sources, even
though the passengers may not hear the audio tone itself.
Caution: Local oscillators and internal signals from entertainment equipment can cause undesired interfer-
ence 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.
2.4.15.1.2 Entertainment 2 Mute (Pin V)
The ICS button on the PMA7000B controls the muting (“Karaoke mode”) of entertainment source #1.
Connecting J2 pin V to ground through a SPST switch places the entertainment #2 music source into the
Karaoke Mode. In this mode, incoming music and intercom conversation will not mute the music for the
passengers’ intercom net. This allows uninterrupted music during casual conversation and at times when
radio communications are of lesser importance.
See section 2.4.14 for alternative connection.
2.4.16 PMA7000B Intercom expansion (J2, Pins P, S, and C)
The PMA7000B contains a 6-place intercom. In applications where more intercom positions are needed,
PS Engineering can provide intercom expansion units, such as the IntelliPAX, part number 11606,
11606R, etc. These can add up to six additional stereo intercom stations, plus independent music input.
Interface to the expansion unit is through J2, pins P (audio input from expansion unit), S (audio output to
expansion unit) and C (9 VDC expansion power).
2.5 Playback and DRAWS (Digital Recorder Aural Warning System) Options
The PMA7000B is available with optional recording capability. Option 1 (DRAWS) contains a playback
function, and aural warnings (see table below). NOTE: This should be requested at time of order; it
cannot be retrofitted.
Option 1 (DRAWS) is not compatible with the CNX80 audio active function. If compatibility is de-
sired, contact PS Engineering at (865) 988-9800 or support@ps-engineering.com. See section 2.8.2.
2.5.1 Playback button Installation (J2, Pin 19- Options 1, 7, ONLY)
To activate the Recording System playback, a momentary push button switch is required. This switch can
be located anywhere in cockpit convenient to the pilot's reach. The switch must be connected to pin 19 of
J2 of the PMA7000B, and ground
2.5.2 Audio Message Acknowledge (J2, Pin W) Option 1 Only)
The audio message installation requires inputs from an external annunciator, such as an Electronics
International engine gage system. A falling edge (input pulled low) when applied to the appropriate pin of
the connector will cause the message to be played, repeating every two seconds, until the acknowledge
(“ACK”) button is pushed.
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