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Garmin G1000 Cockpit Reference Guide for Mooney M20M & M20R

SECTION 3 – AUDIO PANEL

3.2 UNIT OPERATION

Power-up Settings

Upon power-up, the unit undergoes a self-test during

which all panel annunciator lights illuminate for approxi

mately two (2) seconds. Once the self-test is completed,

the settings are restored to the settings that were current

before the unit was last powered off. For example, if the

COM1 MIC, COM1, COM2, SPKR, NAV1, NAV2,

MKR/MUTE, HI SENS, and MAN SQ keys were selected

when the unit was last powered off, these keys will be

automatically re-selected when the unit is powered back

on.

Fail-safe Mode

In the event of an audio panel failure, the unit switches

to fail-safe mode. In fail-safe mode, fail-safe audio is di-

rected to the pilot’s headset (left channel only). Fail-safe

mode bypasses the GMA 1347 circuits, with the exception

of the relay that switches the pilot’s MIC and the pilot’s

headset directly to COM1.

Selecting Keys

For all keys with the exception of the MKR/MUTE

and PLAY keys, pressing a key activates the correspond-

ing channel and illuminates the associated triangular an-

nunciator light.

Deselecting Keys

For all keys with the exception of the COM MIC,

MKR/MUTE and PLAY keys, pressing the key again de-

activates the corresponding channel and turns off the as-

sociated annunciator light.

NOTE: Operational details on the COM MIC,

MKR/MUTE and PLAY keys as well as the DIS-

PLAY BACKUP button are provided later in this

manual.

Lighting

LED key backlighting is controlled automatically by

the MFD (the PFD assumes control should the MFD fail).

NOTE: When a key is active during normal opera-

tions, its corresponding annunciator LED is lit.

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Garmin Software Version 0424.01 Guide de l'utilisateur Page 48