Aircraft Receivers Check; Music System Check - Garmin GMA 347 Maintenance Manual

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4. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and
squelch controls.
3.2.6 Aircraft Receivers Check
Select the audio source corresponding to each installed avionics unit and check for audio over
the headsets.
3.2.7 Music System Check
1. Set the intercom to the ALL mode [Pilot ISO LED off].
2. Connect a stereo audio source to MUSIC 1 (ensure the front panel jack is empty and the
music volume knob is not set to minimum). Verify that stereo audio is heard over all
headset positions when MUSIC 1 is selected as the music source and MUSIC LED is on.
Pull out on the right side small knob and verify that music volume adjustment is working
properly.
3. Select an audio source to COM 1 and verify that the sound is muted by active COM 1
audio when RADIO music mute is selected and by intercom audio when ICS music mute
is selected.
4. Connect a stereo music source to MUSIC 2. Verify that stereo audio is heard when
MUSIC 2 is selected as the music source and MUSIC LED is on.
5. Connect a stereo audio source to the front panel jack. Verify that stereo audio is heard
when MUSIC 1 is selected as the music source and MUSIC LED is on.
This completes basic troubleshooting.
Adjustment to the volume and squelch settings can be made to the GMA 347
through access holes in the unit's top cover. Refer to Section 2.3 of the GMA 347
Installation Manual (P/N 190‐00917‐01) for details.
Page 3‐8
Rev. A
NOTE
GMA 347 Maintenance Manual
190‐00325‐02