PS Engineering PMA7000CAP Installation Manual - Manual (Page 9)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Civil Air Patrol Version Installation and Operator’s Manual
200-072-0004 Page 2-2 Rev. 4, Sept. 2000
Avoid installing the audio panel close to high current devices or systems with high-voltage pulse
type outputs, such as DME or transponders.
2.3.3 Mounting Rack Installation
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is in the
center of the unit. Use caution to avoid hitting the photo-detector lens. Carefully slide the unit
free of the tray. Set the unit aside in a safe location until needed. Install the tray using six FHP
6-32 x ½" screws. The audio selector panel must be supported at front and rear of the mounting
tray.
NOTE: The mounting hole configuration for the PMA7000M-S is identical to the
PMA6000 series and KMA-24 Audio Selector Panels.
2.3.4 Connector Assembly
The unit connectors mate directly with the circuit boards in the PMA7000M-S. The connectors
are a Molex crimp-type, and require the use of a Molex hand crimp tool, EDP P/N 11-01-
0203, CR6115B (or equiv.). The connectors are mounted to the unit tray with #4-40 screws,
from the inside of the tray. Ensure that proper strain relief and chafing precautions are made
during wiring and installation.
2.4 Tray Assembly
Attach the connectors to the tray from the inside, using the #4x40 screws provided. The bottom
connector is keyed at pin 8, and top connector at pin 5. The lettered row of pins faces the top
of the unit.
2.5 Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the
installation. All wires must be MIL-SPEC in accordance with current regulations. Two- and
three-conductor with shield wire must be used where indicated, and be MIL-C-27500 or
equivalent specification. Proper stripping, shielding and soldering technique must be used at all
times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct
techniques may result in improper operation, electrical noise or unit failure. Damage caused by
improper installation will void the PS Engineering warranty.
2.5.1 Noise
Due to the variety and the high power of radio equipment often found in today's general aviation
aircraft, there is a potential for both radiated and conducted noise interference.
The PMA7000M-S power supply is specifically designed to reduce conducted electrical noise
on the aircraft power bus by at least 50dB. Although this is a large amount of attenuation, it may