AA95-766 Single Channel Audio Controller
SM95-766 Installation and Operation Manual
June 20, 2012 Rev: 3.00
Page 2-3
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
The
VOX LEVEL
trimpot sets the sensitivity level for the front panel VOX control (the level of audio
required to activate microphones).
2.3.5
Mechanical Mounting
The AA95-766 may be mounted vertically or horizontally in standard Dzus rails.
Before the unit is mounted, make all functional tests and trimpot adjustments. Be sure the harness has
enough clearance to permit the unit to be pulled out for re-adjustment, if needed later. Make sure unit is
securely fastened to the Dzus rail, and that the connector locks are tightened
before any flight is
attempted.
2.3.6 Post-Installation
Checks
If any preset requires adjustment, be sure this is carried out before the aircraft leaves, and that the unit
and its mating connector are secured before departure.
2.3.6.1 Voltage/Resistance
Checks
Do not attach the AA9x series until the following conditions are met.
Check the following:
a) P101
pin
<17>
for +28 Vdc relative to ground.
b) P101
pin
<34>
for continuity to ground (less than 0.5
:
).
c) P101
pins
<7> <8> <9>
and
<10>
for continuity to ground (less than 0.5
:
) when the relevant
switches are keyed.
d) P102
pin
<19>
for lights bus voltage (+28 Vdc) relative to ground.
e)
Check all Mic, phone, music and key lines for shorts to ground or adjacent pins.
2.3.6.2
Power On Checks
Power up the aircraft's system with the unit installed, and turn on the radios and accessories required for
the system. Refer to Section 3 for operation and set-up information.
Start with only the pilot's headset installed (lo-z mic, hi-z phones). Check for correct ICS, radio, and
transmit operation. Do not proceed until the radios are functioning correctly. The S/T (sidetone) trimpot
accessible through the left side of the controller and the transceiver internal trimpot may have to be
adjusted for correct balance for the pilot. Adjustment of the individual radio RX levels should be set first
with the AA95-766 in Pilot ISO mode, then adjust the AA95-766 front panel RX master volume control
level in NORMAL mode.
Unusual buzzes, hums or other background audio are symptomatic of multiple grounds or noisy external
systems sharing the same wire bundle. Note that incorrect jack wiring is a common fault, especially for
passenger stations, and may cause loss of audio, a tone on the headset lines, or other problems. Failure
to key or correctly modulate a transceiver may be caused by missing grounds on the radio or audio
controller.
