PS Engineering PMA5000EX Installation Manual - Manual (Page 11)

PS Engineering
PMA5000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-550-0100 Page 2-5 Rev. 1 Jan. 2011
waypoint audio, autopilot disconnect tones, or any other critical audio signal. Unswitched #1 is always
presented to the to the crew headphones, and is available to the pilot in fail -safe (off) mode. Unswitched 3
and 4 inputs are always presented to the crew headphones.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
Gain
1 Yes Yes 1:1(fixed)
2 No Yes 1:1(fixed)
3 No Yes Adjustable
4 No Yes 1:1(fixed)
5 (jack) No Yes 1:1(fixed)
Table 2-2 Unswitched input table
Unswitched #2, J1 pin 44 is unswitched is always connected to the Pilot’s headphone.
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 a l-
lows 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 headset s, 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
easier 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 2 3 (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.
NO T E
Use t h e l ow l evel ou t p u t of a n y a d d i t i on a l en t er t a i n m en t d evi ce t o con n ect t o t h e a u -
d i o p a n el . Ma x i m u m si g n a l l evel i s 3 VAC p - p . DO NO T u se a sp ea k er - l evel ou t p u t ,
t h i s wi l l ca u se i n t er n a l d a m a g e i n t h e a u d i o p a n el .