PS Engineering
PMA450B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0600
Page 2-15
Rev. 5, August 2020
Wiring Checkout
After wiring is complete, verify power is ONLY on pins 8 and 9 of the J2 and airframe ground on connector
pins 10 and 11. Failure to do so will cause serious internal damage and void PS Engineering's warranty.
Unit Installation
To install the PMA450B, gently slide the unit into the mounting rack until the hold-down screw is engaged.
While applying gentle pressure to the face of the unit, tighten the 3/32" hex-head in the center of the unit
until it is secure. DO NOT OVER TIGHTEN.
CAUTION
Apply steady pressure to the bezel while screwing the unit into the tray to ensure even seating of the unit and
connectors.
WARNING
Do not over-tighten the lock down screw while installing the unit in tray.
Internal
damage will result.
Operational Checkout
2.12.1 Required Test Equipment
In order to return an aircraft to service after installation of the PMA450B, the installer must have access to a
Marker Beacon signal generator:
a.
IFR NAV401L, NAV402AP, IFR4000
b.
TIC T-30D, T-36C
Equivalent test equipment is acceptable as long as the testing requirements can be met.
2.12.2 Audio Panel Test
NOTE
The
IntelliVox
® is designed for ambient noise levels of 80 dB or above. Therefore, some clipping may occur
in a quiet cabin, such as without the engine running, in a hangar. This is normal
.
Use of a Stereo headset is
required
to obtain full effect of IntelliAudio processing in the crew positions.
1.
Apply power to the aircraft and avionics.
2.
Plug
stereo
headsets into the pilot, copilot, and occupied passenger positions.
3.
Verify fail-safe operation by receiving and transmitting on com 1 from the pilot position, with the audio
panel power off. The Com audio will be present in one ear cup only.
4.
Switch on the unit by pressing the volume (VOL) knob.
5.
Check intercom operation.
6.
Push the C1 Xmt select button (lower row).
7.
Verify that both of the
C1
indicators light. Verify that transmit button LED (Light Emitting Diode) near
the mic selector is not blinking. If the LED is blinking, stop testing and troubleshoot the microphone
PTT installation.
8.
Verify proper transmit and receive operation from the copilot position, noting that the copilot PTT switch
allows proper transmission on the selected transceiver. Verify that the C1 Xmt button blinks when trans-
mitting.
9.
Verify that pushing the
C2
button causes the button to illuminate, and the Com 2 receiver to be heard.
Verify operation on Com 1 from the pilot position.
10.
Repeat for Com 2
11.
Press and hold the C1 Xmt button. While holding the C1 button, press the C2 Xmt button. This places
the unit in “Split Mode;” Verify that the pilot can transmit and receive on Com 1, while the copilot
transmits and receives on Com 2.
12.
Verify proper operation of all receiver sources by selecting them using the appropriate button or menu.
13.
Activate the cockpit speaker by holding the lower line select for 1 second SPR should appear on the
OLED display. Verify that all selected audio is heard in the cockpit speaker. Verify that the audio mutes
when the mic is keyed.
14.
Verify that the appropriate LED in the lower button row blinks when either push to talk is keyed.
