Garmin GMA 340 Manual de instalación - Página 19

Navegue en línea o descargue pdf Manual de instalación para Pantalla de aviónica Garmin GMA 340. Garmin GMA 340 43 páginas. Audio panel
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2.6.2

Failsafe Operation Check

1. Turn the unit off by rotating the pilot intercom knob (5) counter clockwise.

2. Check the failsafe operation by exercising the COM 1 microphone, microphone key and audio over the

headphones.

For units without Mod 4 incorporated, if a monaural headset is plugged into a stereo

jack the ring conductor will be shorted to the barrel conductor when the headset is

plugged in preventing proper failsafe operation. No audio will be heard. In this type of

installation, either a stereo/mono switch must be installed for proper operation or Mod

4 must be incorporated. If Mod 4 is incorporated, the audio will be heard only in the

left channel of a stereo installation. See note 13 in figures B5 and B7 and refer to

Garmin Service Bulletin 0209.

3. Turn the unit back on to continue testing.

2.6.3

1. Perform a ramp test radio check by exercising the installed transceivers, microphone, microphone key and

audio over the headphones and speaker.

2. Verify that communications are loud and clear and PTT operation is correct.

2.6.4

If a monaural headset is used in one position, no damage will occur if plugging

into a stereo jack. In the case of passenger positions, any stereo listener will lose

one channel when another passenger plugs in a mono headset.

1. Set the intercom to the ALL mode [Crew (9) and Pilot (10) LEDs off.]

2. Plug in headsets at each ICS position.

For helicopter operation using a two-stage Intercom/PTT switch, prior to using

the keyed-intercom mode, the VOX level should be set by adjusting the VOX

knob while the first detent is actuated and held.

3. Adjust squelch (8) and volume (7) for each position and verify that the ICS is working properly.

4. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch controls

(5, 6, 7 and 8).

5. Press the PA button (11). Verify that microphone audio is heard over the speaker.

GMA 340 Installation Manual

190-00149-01

NOTE

Page 2-7

Rev. L