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Mono/stereo headsets, Power on/off, Transceivers – Garmin GMA 240 User Manual

Page 7

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190-00917-00 Rev. A

Garmin GMA 240 Pilot’s Guide

7

GMA 240 Audio Panel

MONO/sTereO heAdseTs

The unit can accommodate up to four (4) headsets (Pilot, Copilot and up

to two (2) passengers). The use of stereo headsets is highly recommended.
If monaural headsets are plugged into stereo jacks, power supply fuses may
be damaged.

When wired correctly, the use of a monaural headset in a stereo jack

shorts the right headset channel to ground. Anyone listening on a monaural
headset hears only the left channel in both ears. If a monaural headset is
used at one of the passenger positions, anyone else listening on a stereo
headset hears audio in the left ear only, unless their headset has a mono/
stereo switch set to mono.

POwer ON/OFF

The GMA 240 may be powered ON and OFF with the avionics master

switch. The unit may also be turned ON and OFF with the Pilot ICS Volume
Knob. Rotate the knob clockwise out of the detent to turn ON. Rotate the
knob counterclockwise into the detent to turn OFF.

During power-up, the unit undergoes a self-test, illuminating all panel

annunciator lights for about two (2) seconds. Once the self-test is complete,
the unit is ready for use with the same keys selected as when the system was
last powered OFF.

TrANsCeIvers

Pressing

COM1 MIC

or

COM2 MIC

Key selects the transmitter and receiver

audio for the selected transceiver source. The active COM audio is always
heard on the Pilot headphones. Audio level is controlled by the selected
COM radio volume control.

Either audio source can be selected independently by pressing the

COM1

or

COM2

receiver keys. When selected this way, they remain active as audio

sources regardless of which transceiver has been selected for microphone
use.