Volume Adjustment, Microphone Gain Adjustment

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.

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

Figure 5

Mic Gain Adjustment

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.

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.

RELEASE CATCH

MIC ELEMENT

Figure 6

Mic Element Removal for

Replacement

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