Garmin GMA 350H Kurulum Kılavuzu - Sayfa 26

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3.8

Post Installation Checkout

The GMA 350/350H does not provide valid outputs until the aircraft post installation

configuration procedures are completed.

3.8.1 Verify Failsafe Operation with a Mono Headset

1. Remove power to the unit by pulling the audio breaker.

2. Connect a mono headset to the pilot's headset output jack and pilot's mic jack.

Use of a true mono headset is required for this test to insure proper wiring even if a stereo

jack is provided in the installation. Wiring left channel (tip contact) and right channel

(ring contact) backwards will cause failsafe mode not to function with mono headsets.

Use of a true mono headset is required for this test (not a stereo headset with a

mono/stereo switch because headset manufactures differ on how they accomplish this

switching). This will guarantee the condition of the right channel (ring terminal) being

shorted to the return (sleeve terminal) by the mono headset's plug. This short occurs

because of the physical design of the headset plug contacts and is an inevitable

consequence of plugging a mono headset into a stereo jack. During power-on operation,

this short will not damage the audio panel.

3. Verify that the COM1 transceiver can be heard in the pilot's headset.

4. Verify that COM1 can key and transmit the pilot's mic audio by verifying received sidetone

or checking reception of the transmission with another radio tuned to receive this

transmission (verify Pilot PTT and mic operation is delivered to this transceiver).

5. Apply unit power by restoring the audio breaker to the normal operating position.

3.8.2 Verify Installed Transceivers (COMs) are able to Transmit and

Receive

1. Connect a headset to the pilot's headset output and mic input jack.

2. Verify that each installed transceiver (COM) can be heard when selected.

Depending on settings, the mic selected COM may mute audio from other

COMs.

Page 3-4

Revision B

The document reference is online, please check the correspondence between the online documentation and the printed version.

NOTE

GMA 350/350H Installation Manual

190-01134-11