PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0006
Page 2-5
Rev. 6, Nov 98
craft avionics dimmer. Connect the dimmer control line to J1 pin D for 14 volt systems,
and to J1 pin F for 28 volt systems. Pin E is light ground.
If an external dimmer control is not used, a constant low level back light illumination can
be established for nighttime viewing. Pin D or F (depending on system voltage) must be
tied to power (J1, pin 20) for the back lighting system to work. The photocell mounted in
the unit face will automatically adjust the intensity of the push-button annunciator LEDs.
2.4.9 Unswitched inputs
J1, pin T is the unswitched input number 1 and J1 pin 17 is unswitched input 2. These in-
puts are presented to the pilot and copilot regardless of the audio configuration, and will
always mute the entertainment inputs. These 510Ù inputs can be used for altimeter DH
audio, GPS waypoint audio, autopilot disconnect tones, air-to-ground (Flitefone) tele-
phone ringer or any other critical audio signal. This input is not related to the cellular tele-
phone interface.
2.4.10 Intercom wiring
The top connector (J2) is for the intercom and additional functions. See Appendix for in-
tercom 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 top connector harness can be custom made by PS Engineering, Inc. Simply
call the factory and obtain a wire harness work-sheet. The harness will be made to your
specifications and fully functionally tested. All hardware is included.
2.4.10.1 Entertainment Input
NOTE
: Use the low level output of any entertainment device to connect to
the audio panel. Maximum signal level is
1 VAC
p-p.
DO NOT
use a speaker-level output, this will cause internal damage in the
audio panel
2.4.10.1.1 Stereo entertainment (7000S, 7000MS)
Two stereo entertainment devices (CD player, cassette player, etc.) can be connected to
the unit. Install two
1
/
8
-inch stereo jacks in a convenient location so that the pilot can plug
in the entertainment devices into the system. The audio signal at the entertainment input
must be a minimum of 500 mV P-P per channel for optimum music performance.
All entertainment devices must be switched
off
for both takeoff and landing.
2.4.10.1.2 Entertainment distribution
Entertainment source #1 provides music for the pilot and copilot positions, while enter-
tainment source #2 provides music for the four passenger positions. The PMA7000M-S-