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190-01007-01

GTN 725/750 Maintenance Manual

Rev. 5

Page vi

GTN 725/750 SERVICE BULLETIN HISTORY

The following table identifies service bulletins for the GTN 725/750. The table is current at the time of 
publication of this manual (refer to date on front cover) and is subject to change without notice. Authorized 
Garmin Sales and Service Centers are encouraged to access the most up-to-date bulletin and advisory 
information on the Garmin Dealer Resource Page at 

www.garmin.com

 using their Garmin-provided user 

name and password.

Service Bulletin 

Number

Service Bulletin

Date

Purpose of Bulletin

1887

12/2018

GTN 6XX/7XX Notification of Mod Level 7

1879

10/26/2018

TSO GTN 6XX/7XX Software Upgrade to Main 
Software Version 6.51

1828

09/29/2018

GTN 6XX/7XX TSO Software Upgrade to Main 
Software v6.50 and COM Software v2.30

1722

01/26/2018

GTN 6XX/7XX Software Upgrade to Main Software 
Version 6.41 and NAV Software Version 6.03

1655

09/19/2016

GTN 6XX/7XX TSO Software Upgrade to Main 
Software v6.21 and GMA 35 Version 4.20A/4.21C

1625

06/19/2016

U.S. Forest Service (USFS) and U.S. Department of the 
Interior (DOI) Mod Level 6

1581

09/21/2016

GMA 35 Boot Block Software

1580

03/01/2016

GTN 6XX/7XX Software Upgrade to Main Software 
Version 6.11 and GMA 35 Audio Software Version 
4.10A/4.11C

1559

11/11/2015

GTN 650 750 Notification of Mod Level 5

1526

04/01/2015

GTN 635/650/750 Software Upgrade to COM Software 
Version 2.20

1466

01/14/2015

GTN 6XX/7XX Software Upgrade to Main software 
Version 5.13 and GMA 35 Audio Software Version 3.10

1406

02/27/2014

GTN 6XX/7XX Software Upgrade to COM Software 
Version 2.13

1404

04/03/2014

GTN 650/GTN 750 Notification of Mod Level 4

1369

10/30/2013

GTN 6XX/7XX Software Upgrade Main v4.00, COM 
v2.12, GMA 35 Audio v3.05, and Auxiliary Grammar 
2.20

1365

12/03/2013

GTN 6XX/7XX Series Unit Installations and ARINC 429 
Configuration Settings

1360

10/22/2013

GTN 6XX/7XX Software Upgrade to Main Software 
v5.00, COM Software v2.12, and GMA 35 Software 
v3.07

1356

10/02/2013

GTN 6XX/7XX Software Upgrade to COM Software 
Version 2.12 and GMA 35 ARC Database Version 3.08

Summary of Contents for GTN 725

Page 1: ...190 01007 01 March 2019 Revision 5 GTN 725 750 Maintenance Manual...

Page 2: ...d that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this man...

Page 3: ...2 08 21 2014 Document update 3 03 22 2016 Added internal datacard removal and replacement procedure 4 12 03 2018 Added instructions for installation and removal of HW Mod 7 Battery Accessory 5 03 11...

Page 4: ...ance manual These are recommended precautions personnel should understand and apply during the many phases of maintenance and repair KEEP AWAY FROM LIVE CIRCUITS Maintenance personnel shall observe al...

Page 5: ...isposed of properly Battery replacement and removal must be performed by a Garmin Authorized Repair Station WARNING Perchlorate Material special handling may apply Refer to www dtsc ca gov hazardouswa...

Page 6: ...mage can be prevented by touching an object which is of the same electrical potential as the GTN before handling the GTN itself NOTE All screen shots used in this document are current at the time of p...

Page 7: ...7XX TSO Software Upgrade to Main Software v6 21 and GMA 35 Version 4 20A 4 21C 1625 06 19 2016 U S Forest Service USFS and U S Department of the Interior DOI Mod Level 6 1581 09 21 2016 GMA 35 Boot B...

Page 8: ...tification of Mod Level 2 1304 05 03 2013 GTN 6XX 7XX Software Upgrade to Software Version 3 01 1236 05 03 2013 GTN 6XX 7XX Software Version 3 00 1216 06 25 2012 GTN 635 650 750 Units and 16W COM Enab...

Page 9: ...1 LRU Failure Annunciations 4 1 4 2 System Messages 4 3 5 REMOVAL AND REPLACEMENT PROCEDURES 5 1 5 1 GTN 725 750 Unit Removal and Replacement 5 2 5 2 GTN Removal with Damaged Jackscrew 5 3 5 3 Fan Rem...

Page 10: ...Flag 4 3 Figure 4 3 GTN 725 750 Message Page 4 3 Figure 5 1 GTN 725 750 Unit Retention Mechanism Adjustment 5 2 Figure 5 2 Cam Head Removal 5 3 Figure 5 3 Fan Backplate Orientation 5 4 Figure 5 4 I O...

Page 11: ...e Annunciation Troubleshooting Guide 4 2 Table 4 3 GTN 7XX System Messages 4 4 Table 4 4 GPS SBAS Messages 4 6 Table 4 5 VLOC Glideslope Messages GTN 750 Only 4 7 Table 4 6 COM Messages GTN 750 Only 4...

Page 12: ...device documentation The Garmin publications listed below are available for download from the Garmin Dealer Resource Center Table 1 1 Related Publications 1 4 Warranty Information For complete warrant...

Page 13: ...chscreen used to perform most functions is supplemented by HOME and DIRECT TO hard keys as well as audio control and dual concentric control knobs GTN 725 The GTN 725 is a GPS SBAS unit which may be a...

Page 14: ...of GTN 725 750 external signal and power interfaces Note that COM and NAV boards are present only in the GTN 750 J1001 J1002 J1003 J1004 J1008 J1007 I O MAIN NAV GTN 750 only COM GTN 750 only J1006 G...

Page 15: ...SFER SWITCH COM REMOTE TUNE UP COM REMOTE TUNE SWITCHES COM REMOTE TUNE DOWN MICROPHONE COM AUDIO VLOC AUDIO POWER GROUND AIRCRAFT POWER GROUND VOR OBI NAV ARINC 429 IN NAV ARINC 429 OUT POWER GROUND...

Page 16: ...to avoid scratching the surface of the display The GTN screen can be cleaned during operation by touching the Clean Screen key on the Utilities page Press the HOME key to exit Screen Cleaning Mode 2 3...

Page 17: ...m selected course to from indications lateral and vertical flags and superflags with or without an OBS resolver connection The GTN 725 750 also supports configurable discrete inputs and outputs for an...

Page 18: ...mponent Follow instructions in section 1 2 to return the unit or component to Garmin for repair If the following troubleshooting approaches are unsuccessful visit flyGarmin com 4 1 LRU Failure Annunci...

Page 19: ...ls Perform a COM harness power ground test Refer to appendix A 3 for pinout information COM harness power ground circuit functioning normally Replace the GTN Refer to section 5 1 for details GTN 750 o...

Page 20: ...ystem Messages GTN 725 750 System messages are accessed by touching the MSG key on the Home page shown in figure 4 2 System messages are also displayed on the Message page shown in figure 4 3 Figure 4...

Page 21: ...Demo mode is active Do not use for navigation The GTN is in Demo Mode and must not be used for actual navigation Check the DIRECT TO key is not stuck or pressed while the unit is being powered up GTN...

Page 22: ...k in the pressed position The small knob push key is stuck in the pressed state Knob is located on the upper left corner of the bezel Press the knob to cycle its operation If the message persists repl...

Page 23: ...fer to section 5 1 for details GPS RECEIVER Low internal clock battery The GTN has detected a low battery Almanac data may have been lost Check GTN battery security and orientation Refer to section 5...

Page 24: ...efer to appendix A 4 for details Replace the GTN Refer to section 5 1 for details GLIDESLOPE Glideslope receiver needs service Replace the GTN Refer to section 5 1 for details VLOC RECEIVER Navigation...

Page 25: ...perative The COM radio has detected an internal failure in its COM radio and may not be receiving power Cycle the GTN COM Circuit Breaker Check power and ground wiring to the COM board Refer to append...

Page 26: ...ect GTN unit Check that the GTN system ID was entered correctly when creating the datacard Re load these databases on the external SD card from flyGarmin com DATACARD ERROR SD card is invalid or faile...

Page 27: ...more of the following Touchscreen Audio volume knob HOME key DIRECT TO key Dual concentric knobs Display head circuitry malfunctioning Replace the GTN Refer to section 5 1 for details OBS indication...

Page 28: ...arm Refer to section 5 1 for details Install arm is detached from jackscrew Replace GTN bottom cover Refer to section 5 6 for details Install arm jackscrew spins freely for more than 18 revolutions wh...

Page 29: ...oduct warranty For complete information regarding Garmin aviation warranty policies and procedures refer to Garmin Aviation Warranty Policies and Procedures P N M02 60069 00 CAUTION Removal and replac...

Page 30: ...rn the hex tool counterclockwise until the unit is forced out approximately 3 8 and the hex drive tool completely stops This takes approximately 17 5 turns of the hex tool 3 Slide the GTN unit out of...

Page 31: ...figure 5 2 for details 3 Remove the countersunk screw connecting the cam head to the retention arm 4 Remove the cam head CAUTION Removing the cam head screw will allow the retention arm linkage to sw...

Page 32: ...4 40 x 0 25 panhead screws at each corner of the inside rear wall of the rack 4 While depressing the metal spring at the lower left hand corner of the rack s rear face slide the connector backplate t...

Page 33: ...le performing the following procedure Removal 1 Remove the single 4 40 x 0 25 panhead screw from the display head side of the head chassis top brace 2 Remove the four 4 40 x 1 375 panhead screws from...

Page 34: ...ip 3 With a GENTLE prying motion toward the battery disengage the battery cover clip tooth from the battery holder 4 Repeat steps 2 and 3 in the slot next to the battery holder negative contact 5 Lift...

Page 35: ...the slot between the battery holder positive contact and the battery assembly clip 3 With a GENTLE prying motion toward the battery disengage the battery assembly clip tooth from the battery holder 4...

Page 36: ...ve the single 4 40 x 0 25 countersunk screw and four 4 40 x 0 25 panhead screws securing the bottom cover to the COM NAV chassis 2 Remove the bottom cover Replacement 1 Place the bottom cover on the C...

Page 37: ...by placing the knob on the end of the shaft and rotating the knob while applying a light pressure until the features align 3 Once aligned apply more pressure and continue pressing until the knob stop...

Page 38: ...ing the datacard slot 2 Take the tip of a demagnetized 1 flat tip screwdriver or equivalent tool and use it to lightly press on the datacard This releases the card To replace the datacard 1 Insert the...

Page 39: ...ng and reinstalling the GTN 725 750 according to the instructions in section 5 1 power up the GTN in normal mode Check all software against current versions Verify there are no GTN red Xs and no GTN r...

Page 40: ...y Replacement Kit K00 00569 00 GTN Fan Cable Assembly Replacement Kit K00 00575 00 GTN 6XX 7XX Bottom Cover Subassembly S11 02308 00 GTN Replacement Knob Set K00 00578 00 GTN Internal Datacard Replace...

Page 41: ...The connector diagrams show pin orientation for the GTN J connectors Connections are shown in figure A 1 J1001 J1002 J1003 J1004 J1008 J1007 I O MAIN NAV GTN 750 only COM GTN 750 only J1006 GPS J1005...

Page 42: ...S 232 OUT 3 Out 7 RS 232 OUT 2 Out 8 RS 232 OUT 1 Out 9 ARINC 429 OUT 2A Out 10 ARINC 429 OUT 1A Out 11 MAIN TO OUT Out 12 MAIN VERTICAL UP OUT Out 13 MAIN LATERAL SUPERFLAG OUT Out 14 OBS ANNUNCIATE...

Page 43: ...1 Out 54 MESSAGE ANNUNCIATE 1 Out 55 APPROACH ANNUNCIATE 1 Out 56 ILS GPS APPROACH Out 57 TAWS INHIBIT ANNUNCIATE 1 Out 58 FAN TACH IN In 59 FAN POWER OUT 12 VDC Out 60 MAIN OBS STATOR G GND 61 LIGHT...

Page 44: ...denotes the signal is an Active Low requiring a ground to activate If there is no asterisk the signal is an Active High 1 This discrete may be configured to perform another function Refer to GTN 725...

Page 45: ...ter the SYSTEM ID PROGRAM pin is no longer used Instead the System ID is set through the System ID settings Refer to GTN 725 750 TSO Installation Manual P N 190 01007 02 for more details Pin Pin Name...

Page 46: ...ERVED 2 RESERVED 3 RESERVED 4 RESERVED 5 COM MIC 1 AUDIO IN HI In 6 RESERVED 7 500 COM AUDIO HI Out 8 RESERVED 9 RESERVED 10 RESERVED 11 COM MIC 1 KEY In 12 RESERVED 13 RESERVED 14 RESERVED 15 RESERVE...

Page 47: ...ame denotes the signal is an Active Low requiring a ground to activate If there is no asterisk the signal is an Active High 35 RESERVED 36 RESERVED 37 AIRCRAFT GND 38 AIRCRAFT GND 39 RESERVED 40 AIRCR...

Page 48: ...7 RESERVED 8 VOR LOC COMPOSITE OUT Out 9 VOR OBS ROTOR C Out 10 VOR OBS ROTOR H GND 11 VOR OBS STATOR E GND 12 VOR OBS STATOR F In 13 VOR OBS STATOR D In 14 VOR OBS STATOR G GND 15 VOR LOC SUPERFLAG O...

Page 49: ...PERFLAG Out 39 PAR DME 100KHZ B Out 40 PAR DME 100KHZ C Out 41 DME COMMON In 42 PAR DME 100KHZ D Out 43 PAR DME 50KHZ Out 44 SERIAL DME DME REQUEST In Out 45 PAR DME 1MHZ A Out 46 PAR DME 1MHZ B Out 4...

Page 50: ...5 I O Connector View looking at rear of unit Pin 1 is on bottom left Pin Pin Name IO 1 RESERVED 2 RESERVED 3 RESERVED 4 RESERVED 5 RESERVED 6 RESERVED 7 ARINC 429 OUT 3B Out 8 RS 232 OUT 5 Out 9 RS 23...

Page 51: ...NCHRO REF HIGH In 37 ARINC 429 IN 3A In 38 ARINC 429 IN 4A In 39 RESERVED 40 ARINC 453 708 TERM 1A 41 RESERVED 42 ARINC 453 708 TERM 2A 43 RESERVED 44 RESERVED 45 RESERVED 46 RESERVED 47 RESERVED 48 R...

Page 52: ...190 01007 01 GTN 725 750 Maintenance Manual Rev 5 Page A 12 61 RESERVED 62 ARINC 453 708 IN 2B In Pin Pin Name IO...

Page 53: ...01007 01 GTN 725 750 Maintenance Manual Rev 5 Page B 1 APPENDIX B AFM AFMS POH CONSIDERATIONS Refer to GTN 725 750 TSO Installation Manual P N 190 01007 02 for information on AFM AFMS POH considerati...

Page 54: ......

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