PS Engineering PMA4000 Installation Manual - Manual (Page 13)

PS Engineering
PMA4000 Series Audio Selector Panel and IntelliVox™ Intercom System
Installation Manual
200-041-0002 Page 3-1 Rev 5, March 2007
Section III OPERATION
GENERAL INFORMATION
3.1 SCOPE
This section provides detailed operating instructions for the PS Engineering PMA4000
TSO Audio Selector Panel/Intercom Systems. Please read it carefully before using the
equipment so that you can take full advantage of its capabilities.
This section is divided into three sections covering the basic operating areas of the
PMA4000 systems. They are: Audio Selector, Transceiver Selection and Intercom.
3.2 Audio Selector
Through the use of four latched, push-button, back-
lit switches, it is possible to select any or all re-
ceiver audio.
When selected, an internal backlight will illuminate
indicating which audio source is selected. The Com
toggle switch controls what transceiver is being
heard by the pilot and copilot. "C1" (Com 1) and
"C2" (Com 2) push-buttons select the receiver, and
are used to monitor a com that is not selected for
transmit. You will always hear the audio from the
transceiver that is selected by the 2-position mic selector toggle switch.
The users can identify which receivers are selected by noting which push-button switches
are illuminated. Push buttons labeled N1 (Nav 1), N2 (Nav 2) are "latched" type
switches. When one of these buttons is pressed, it will stay in the "in" position. Press the
switch again and it be in the "out" position and remove that receiver from the audio.
While selected, the switch will also be annunciated by an internal lamp.
3.2.1 Intercom Mode Selector Switch
Unit power is turned on and off by the mode selector switch. In
the
OFF or " FAIL - SAFE " position, the pilot is connected directly to
Com 1 allowing transmit and receive capability regardless of unit
condition. Any time power is removed or turned
OFF
, the audio
selector will be placed in the fail-safe mode. The switch is a 3-
position mode switch that allows the pilot to tailor the intercom
function to best meet the situation.
I
SO
: (Up Position): The pilot is isolated from the intercom and is connected only to the
aircraft radio. He will hear the aircraft radio reception (and sidetone during radio trans-
missions if provided by the transceiver). Copilot and passengers will hear the intercom
and music on Entertainment input, but not the aircraft radio receptions or pilot transmis-
sions.
Figure 3-1 PMA4000