Northern Airborne Technology AA95-766 - Manual (Page 13)

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual
2.3.4.2
Left Side panel adjustments
VOX
LEVEL
S / T
LEVEL
DIR AUD
LEVEL
The trimpots on the left side panel are used to adjust the levels of audio in the user’s
headphones. Rotating the trimpots clockwise (cw) increases the level, and counterclockwise
(ccw) reduces it.
The DIR AUD LEVEL trimpot is used to adjust the level for the Direct Audio signal.
The S/T LEVEL trimpot adjusts the internal gain of the sidetone of the selected
transceiver (from the front panel).
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 Ω).
c) P101 pins <7> <8> <9> and <10> for continuity to ground (less than 0.5 Ω) 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.
Dec 6, 2004 Page 2-3
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.