Northern Airborne Technology AA20-431 - Manual (Page 12)

SM22 Rev. 4.10 AA20-431 Cabin PA System Manual
2.3.6
Fuses and Breakers
Power to this unit must be supplied from a separate 3A breaker or 3A fast blow fuse.
2.3.7
Adjustments
Refer to Mechanical Installation drawing AA20\431\922-0 for the positions of the
adjustments.
The unit ships 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. The internal adjustments, which can be
accessed through holes located on the top of the unit, are as follows:
2.3.7.1 Headset
Level
The volume level of the headset audio can be adjusted by potentiometer HEADSET
LEVEL. The cw rotation of this control will increase headset volume level.
2.3.7.2 Speaker
Level
The volume level of the speaker audio can be adjusted by potentiometer SPEAKER
LEVEL. The cw rotation of this control will increase speaker volume level.
Note: The Headset and Speaker level controls will affect the levels set by the other
trimpots. If they must be adjusted they should be done first
2.3.7.3 Music
Level
The volume level of the music can be adjusted by potentiometer MUSIC LEVEL. The
cw rotation of this control will increase music volume level.
2.3.7.4 Sidetone
Level
The volume level of the sidetone can be adjusted by potentiometer S/T LEVEL. The cw
rotation of this control will increase S/T volume level.
2.3.7.5 Microphone
Level
The volume level of the microphone audio can be adjusted by potentiometer MIC
LEVEL. The cw rotation of this control will increase microphone volume level.
2.3.7.6 Chime
Level
The volume level of the chime can be adjusted by potentiometer CHIME LEVEL. The
cw rotation of this control will increase chime volume level.
Apr 21, 2004 Page 2-3
ENG-FORM: 805-0106.DOT
Amendment #1 Jan 1 8, 2005
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.