PS Engineering PMA7000CAP Installation Manual - Manual (Page 12)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Civil Air Patrol Version Installation and Operator’s Manual
200-072-0004 Page 2-5 Rev. 4, Sept. 2000
copilot/observer on Com 1. Any combination shown on the mic selector switch can be reversed
in this manner.
When the swap switch is active, the green “SWAP” LED illuminates on the PMA7000MS.
This indicates that the mic selector position is no longer correct. Changing the mic selector will
cancel the swap mode.
2.5.8 Backlighting
The PMA7000M-S has an automatic dimming of the pushbutton annunciator LEDs and marker
lamps controlled by a photocell. Control of the unit backlighting is through the aircraft 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.
2.5.9 Unswitched inputs
J1, pin T is the unswitched input number 1 and J1 pin 17 is unswitched input 2. These inputs are
presented to the cockpit speaker 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) telephone ringer or
any other critical audio signal. This input is not related to the cellular telephone interface.
2.5.10 Intercom wiring
The top connector (J2) is for the intercom and additional functions. See Appendix 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 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.
2.5.10.1 Entertainment Input
NOTE: Use the low- level output of any 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.