Garmin GMA 245 Installation Manual page 50

3.7.4 Intercom System (ICS) Check
NOTE
Stereo headsets are recommended if stereo jacks are installed. If a monaural headset is
used in a stereo jack, the audio panel's right channel output is shorted to ground by the
mono headset's plug (the audio panel automatically detects the short and turns off the
right channel). In the case of passenger positions wired in parallel, any stereo listener
will lose right channel audio when another passenger plugs in a mono headset.
1. Set the intercom to the ALL mode [Pilot and Crew LED off.]
2. Plug in headsets at each ICS position.
3. Check Pilot and Copilot ICS positions for isolation and proper operation of volume controls.
3.7.5 Aircraft Receivers Check
1. Select the audio source corresponding to each installed avionics unit and check for audio over the
headsets.
3.7.6 Music System Check
1. Set GMA to ALL mode with Pilot and Crew button off.
2. Connect a stereo audio source to MUSIC 1. Verify that stereo audio is heard over all headset
positions when MUSIC 1 is selected as the music source and MUSIC LED is on. Verify that music
volume adjustment is working properly for Pilot and Copilot/Passengers (if passenger headsets are
wired).
3. Select an audio source to COM 1 and verify that the sound is muted by active COM 1 audio when
Radio Mute Music is selected and by intercom audio when ICS Mute Music 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.
3.7.7 Bluetooth Music System Check
1. Pressing and Holding the TEL (pair) button, Pair and wirelessly connect a Bluetooth phone or
tablet to the GMA. Refer to Pilots Guide for specific instructions.
2. Play music on a device using the Bluetooth connection and adjust the device volume near
maximum.
3. With the MUSIC button on and the Bluetooth music selected, verify music is heard in the
connected headsets and that the music volume on the GMA adjusts the volume in the headset.
NOTE
To ensure the music audio is not being muted by ICS or by COM audio, deselect the
RADIO MUTE and ICS MUTE buttons. Also, deselect the PILOT or CREW buttons so
that there is no ICS Isolation.
3.7.8 USB Charge test
1. Connect your device to the USB charge port and verify your device charges.
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Rev. 6
GMA 245/245R Installation Manual
Page 3-20