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Figure 5
Mic Gain Adjustment
Microphone Gain Adjustment
The microphone gain has been
factory-adjusted to the nominal
level required for aircraft use
and should normally not require
readjustment. Readjustment by
a qualified avionics technician is
recommended. To access the
gain trimmer, insert a small flat-
blade screwdriver through the
access hole in the mic element
(Figure 5). Clockwise rotation of
the trimmer increases gain.
MIC GAIN
ADJUSTMENT
ACCESS
Ear Cushion Replacement
To remove an old ear cushion, simply grasp it and pull it off the earcup.
To install a new ear cushion, start at the top of the earcup. Place the flap
on the back of the ear cushion over the lip along the top of the earcup.
Then pull the bottom of the ear cushion down over the lip at the bottom
of the earcup.
RELEASE CATCH
MIC ELEMENT
Figure 6
Mic Element Removal for
Replacement
Mic Element Removal
Press the release catch on the
microphone element, and
carefully pull out the element.
Avoid pulling the microphone
wires. Pull on the plastic
connector housing to unplug the
microphone element.
Volume Adjustment
When the microphone is worn on the left side, volume is increased by
rotating the top of the volume controls clockwise. Control operation is
reversed when the microphone is worn on the right side.