Garmin GMA 347 Maintenance Manual - page 5
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CONTENTS
SECTION 1—INTRODUCTION
1.1
Model Designation ......................................................................................... 1‐1
1.2
Maintenance Concept .................................................................................... 1‐2
1.3
Factory Repair ................................................................................................ 1‐2
1.4
Service Bulletins ............................................................................................. 1‐3
SECTION 2—AUDIO PANEL DESCRIPTION
2.1
Unit Features .................................................................................................. 2‐1
2.1.1
Intercom System ............................................................................................ 2‐1
2.1.2
Digital Voice Recorder ................................................................................... 2‐1
2.1.3
Marker Beacon Receiver ................................................................................ 2‐1
2.1.4
Smart Mute .................................................................................................... 2‐1
2.1.5
MUSIC 1 and MUSIC 2 Controls ..................................................................... 2‐2
2.1.6
Fail Safe Operation ......................................................................................... 2‐2
2.2
Audio Panel Controls...................................................................................... 2‐3
2.3
Theory of Operation....................................................................................... 2‐5
SECTION 3—TROUBLESHOOTING
3.1
Test Conditions .............................................................................................. 3‐1
3.1.1
Test Setup ...................................................................................................... 3‐1
3.1.2
Rear Chassis Connectors ................................................................................ 3‐1
3.2
Test Procedures ............................................................................................. 3‐6
3.2.1
Power Checks ................................................................................................. 3‐6
3.2.2
Front Panel Assembly Tests ........................................................................... 3‐6
3.2.3
Failsafe Operation .......................................................................................... 3‐7
3.2.4
Transceiver Operational Check ...................................................................... 3‐7
3.2.5
Intercom System (ICS) Check ......................................................................... 3‐7
3.2.6
Aircraft Receivers Check ................................................................................ 3‐8
3.2.7
Music System Check ...................................................................................... 3‐8