Table Of Contents - Garmin GMA 347 Maintenance Manual

_________________________________________________________________
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
CONTENTS
iii