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Microphone Gain Adjustment
The microphone gain has been factory-adjusted to the nominal level required for aviation
use. It should normally not require readjustment. Readjustment by a qualified avionics
technician is recommended if adjustment is needed. To access the gain trimmer,
insert a small flat-blade screwdriver through the access hole in the mic assembly.
Clockwise rotation of the trimmer increases gain.
MIC GAIN
ADJUSTMENT
ACCESS
Figure 4
Page 4
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