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SM69 Rev. 4.00 AA12S Series Compact Audio Controller Manual
2.3.5.1 Voltage/Resistance Checks
Check the following:
a) P101 pin <1> for avionics buss voltage.
b) P101 pin <16> for continuity to ground.
c) P101 pins <9> <10> <11> and <12> for continuity to ground when the relevant
switch is closed. (Also check pins <13> and <14> if switches are installed in
these positions.)
d) P301 pin <5> for avionics lighting bus voltage relative to ground (with lighting on).
e) P301 pin <17> for continuity to ground.
2.3.5.2 Power On Checks
a) Install the AA12S and power up the ship’s systems. Turn on the radios and
accessories required for the system.
b) Check for correct radio audio and adjust for acceptable level.
c) Run through all installed functions, and check the ICS and TX functions for all
users. Refer to Section 3 for specific operation details.
Note: Significantly different headsets may have different mic characteristics.
d) 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.
Make all required log book entries, electrical load, weight and balance
amendments and other paperwork as required by your local regulatory agency.
2.3.6 Adjustments
The internal adjustments that can be varied are located along the sides of the unit and
are accessed through necessary switches and trimpots.
Note: The unit is shipped from the factory with all internal adjustments set to the normal
test levels. Once installed in the aircraft, it may be desirable to change some of
these settings to best suit the local operating environment.
2.3.6.1 Left Side Adjustments
MUTE
MUSIC
BASS
ICSICS
BAL
RL
The adjustments found on the left side of the unit are:
ICS BAL R L, which controls the ICS Balance;
ICS BASS, which controls the ICS bass level;
and MUSIC MUTE, which controls the Music mute level.
Oct 13, 2005 Page 2-3
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.