Garmin GTN 725 Installation Manual page 7

2.7 Air Circulation and Cooling ...................................................................................................2-11
2.8 Compass Safe Distance ..........................................................................................................2-11
3. INSTALLATION PROCEDURES..................................................................................................3-1
3.1 Unit and Accessories ................................................................................................................3-1
3.2 Optional Accessories ................................................................................................................3-2
3.2.1 GPS Antenna Options ..........................................................................................................3-2
3.3 Database Options......................................................................................................................3-3
3.4 Miscellaneous Options .............................................................................................................3-3
3.5 Optional Reference Material ....................................................................................................3-3
3.6 Installation Materials Required but Not Provided ....................................................................3-4
3.6.1 Optional Accessories Not Supplied......................................................................................3-4
3.6.2 Materials Required But Not Supplied (New Installations Only)..........................................3-4
3.7 Special Tools Required.............................................................................................................3-4
3.8 Cable Installation......................................................................................................................3-5
3.9 Equipment Mounting................................................................................................................3-7
3.9.1 Rack Installation...................................................................................................................3-7
3.9.2 GTN Unit Insertion and Removal ........................................................................................3-7
3.9.3 Unit Replacement.................................................................................................................3-7
3.10 Antenna Installation and Connections ......................................................................................3-8
3.10.1 GPS Antenna........................................................................................................................3-8
3.10.2 COM Antenna ......................................................................................................................3-9
3.10.3 NAV Antenna.......................................................................................................................3-9
4. SYSTEM INTERCONNECTS ........................................................................................................4-1
4.1 Pin Function List ......................................................................................................................4-1
4.1.1 P1001 Main Connector - Main Board .................................................................................4-1
4.1.2 P1002 Connector..................................................................................................................4-3
4.1.3 P1003 COM Connector........................................................................................................4-4
4.1.4 P1004 NAV Connector ........................................................................................................4-5
4.2 I/O Board ..................................................................................................................................4-7
4.2.1 P1005 Connector..................................................................................................................4-7
4.3 Power, Lighting, And Antennas ...............................................................................................4-9
4.3.1 Power....................................................................................................................................4-9
4.3.2 Lighting Bus.........................................................................................................................4-9
4.3.3 Antennas...............................................................................................................................4-9
4.3.4 Serial Data..........................................................................................................................4-10
4.3.5 Ethernet (HSDB) ................................................................................................................4-15
4.3.6 Main Audio Output ............................................................................................................4-15
4.3.7 Main Indicator....................................................................................................................4-16
4.3.8 OBS ....................................................................................................................................4-17
4.3.9 Discrete Inputs ...................................................................................................................4-17
4.3.10 Discrete Outputs.................................................................................................................4-19
4.3.11 Heading Synchro................................................................................................................4-21
4.3.12 Composite Video (function not currently implemented) ...................................................4-22
4.3.13 COM Audio (GTN 750 only).............................................................................................4-23
4.3.14 COM Discrete Inputs .........................................................................................................4-24
4.3.15 VOR/ILS Indicator (GTN 750 only)..................................................................................4-25
4.3.16 RMI/OBI (GTN 750 only) .................................................................................................4-27
4.3.17 DME Tuning (GTN 750 only) ...........................................................................................4-28
GTN 725/750 TSO Installation Manual
190-01007-02
Page iii
Rev. A