Garmin GTN 6XX User manual

190-01007-A1 March 2013 Revision 5
System Maintenance Manual
GTN 6XX/7XX Part 23 AML STC
Contains Instructions for Continued Airworthiness
for STC SA02019SE-D
Aircraft Make, Model, Registration Number, and Serial
Number along with the applicable STC configuration
information must be completed in Appendix A and
saved with aircraft permanent records.

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 5 Page A
©Copyright 2011-2013
Garmin International, Inc., or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted,
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written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual and
of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and to
print one copy of this manual or of any revision hereto, provided 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 manual or any revision hereto is strictly prohibited.
At Garmin, we value your opinion. For comments about this guide, please e-mail:
[email protected].
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Telephone: [phone]
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Web Site Address: www.garmin.com
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Telephone: [phone]
Fax: [phone]
RECORD OF REVISIONS
Revision Revision Date Description
1 03/04/2011 Initial Release
2 01/18/2012 Added instructions for NAV antenna cable splitter and diplexer.
3 11/19/12 Reorganized to add maintenance instructions.
4 12/13/12 Removed ASR material and other minor edits.
5 3/25/2013
Revised to incorporate changes associated with GTN main software
version 4.10, COM software version 2.11, and GMA software version
3.05.

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page B Rev. 5
DOCUMENT PAGINATION
Section Pagination
Table of Contents i - vi
Section 1 1-1 through 1-4
Section 2 2-1 through 2-6
Section 3 3-1 through 3-18
Section 4 4-1 through 4-8
Section 5 5-1 through 5-20
Section 6 6-1 through 6-28
Section 7 7-1 through 7-24
Section 8 8-1 through 8-2
Appendix A A-1 through A-22

190-01007-A1 GTN 6XX/7XX AML STC System Maintenance Manual
Rev. 5 Page i
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration Regulations
(“EAR”) issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and
which may not be exported, released, or disclosed to foreign nationals inside or outside of the United States
without first obtaining an export license. A violation of the EAR may be subject to a penalty of up to 10
years imprisonment and a fine of up to $1,000,000 under Section 2410 of the Export Administration Act of
1979. Include this notice with any reproduced portion of this document.
This information in this document is subject to change without notice. Visit the Garmin web site
(www.garmin.com) for current updates and supplemental information concerning the operation of Garmin
products.
DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES
WARNING
Warnings are used to bring to the installer’s immediate attention that not only
damage to the equipment but personal injury may occur if the instruction is
disregarded.
CAUTION
Cautions are used to alert the individual that damage to equipment may result
if the procedural step is not followed to the letter.
NOTE
Notes are used to expand and explain the preceding step and provide further
understanding of the reason for the particular operation.

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page ii Rev. 5
TABLE OF CONTENTS
1 INTRODUCTION..............................................................................................................................1-1
1.1 Content, Scope and Purpose.......................................................................................................1-1
1.2 Organization ...............................................................................................................................1-1
1.3 Definitions and Abbreviations ...................................................................................................1-2
1.4 Publications ................................................................................................................................1-3
1.5 Distribution.................................................................................................................................1-4
2 SYSTEM DESCRIPTION.................................................................................................................2-1
2.1 Equipment Descriptions .............................................................................................................2-1
2.2 Backplate Connectors.................................................................................................................2-2
2.3 GTN Optional Interfaces............................................................................................................2-4
2.4 GTN Block Diagram ..................................................................................................................2-5
3 GTN CONTROL AND OPERATION .............................................................................................3-1
3.1 GTN Controls.............................................................................................................................3-1
3.2 GTN Normal Mode Overview ...................................................................................................3-1
3.3 Software Loading .......................................................................................................................3-2
3.4 GTN Configuration Mode Overview .........................................................................................3-6
3.5 Database Updates .....................................................................................................................3-19
4 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS.........................................................4-1
4.1 Airworthiness Limitations..........................................................................................................4-1
4.2 Servicing Information ................................................................................................................4-1
4.3 Maintenance Intervals ................................................................................................................4-2
4.4 Visual Inspection........................................................................................................................4-3
4.5 Electrical Bonding Test..............................................................................................................4-4
4.6 Transient Voltage Suppressor (TVS) (If Installed) ....................................................................4-6
4.7 GPS/WAAS Antenna Cable Overbraid Inspection (If Installed)...............................................4-8
4.8 WXR HSDB Cable Overbraid Inspection (If Installed).............................................................4-8
5 TROUBLESHOOTING ....................................................................................................................5-1
5.1 GTN General Troubleshooting...................................................................................................5-1
5.2 GTN Failure Annunciations .......................................................................................................5-5
5.3 GTN System Messages ..............................................................................................................5-6
5.4 GMA 35 Troubleshooting ........................................................................................................5-19
5.5 GMA 35 Failure Annunciations...............................................................................................5-20
5.6 GMA 35 System Messages ......................................................................................................5-20
6 EQUIPMENT REMOVAL AND REINSTALLATION ................................................................6-1
6.1 GTN............................................................................................................................................6-1
6.2 GMA 35......................................................................................................................................6-5
6.3 SD Card ......................................................................................................................................6-7
6.4 NAV Antenna Cable Diplexer ...................................................................................................6-8
6.5 NAV Antenna Cable Splitter......................................................................................................6-9
6.6 Configuration Module (P1001 Only) .......................................................................................6-10
6.7 GTN Fan...................................................................................................................................6-13
6.8 TVS and Fuse (Nonmetallic Aircraft Only).............................................................................6-16
6.9 GPS/SBAS Antenna Cable Overbraid .....................................................................................6-20
6.10 WXR HSDB Cable Overbraid .................................................................................................6-23
7 EQUIPMENT CONFIGURATION AND TESTING.....................................................................7-1
7.1 GTN 6XX/7XX ..........................................................................................................................7-1
7.2 GMA 35......................................................................................................................................7-6
7.3 Configuration Module ..............................................................................................................7-10
7.4 Interfaced Equipment ...............................................................................................................7-10

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 5 Page iii
7.5 Enabled Features ......................................................................................................................7-23
8 SYSTEM RETURN TO SERVICE PROCEDURE........................................................................8-1
8.1 Maintenance Records .................................................................................................................8-1
APPENDIX A AIRCRAFT SPECIFIC INFORMATION .................................................................A-1
A.1 General Information ..................................................................................................................A-1
A.2 Configuration Log .....................................................................................................................A-2
A.3 Wire Routing .............................................................................................................................A-9
A.4 Aircraft Wiring Diagrams .......................................................................................................A-11
A.5 Equipment Location ................................................................................................................A-11
A.6 Equipment Interfaced to the GTN 6XX/7XX .........................................................................A-12
A.7 Equipment Interfaced to the GMA 35.....................................................................................A-17

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page iv Rev. 5
LIST OF FIGURES
Figure 2-1. GMA 35 Connector Layout Detail - Rear View .....................................................................2-2
Figure 2-2. GTN 650 Connector Layout Detail - Rear View ....................................................................2-2
Figure 2-3. GTN 750 Connector Layout Detail - Rear View ....................................................................2-3
Figure 2-4. GTN System Interface Diagram .............................................................................................2-5
Figure 3-1. GTN 6XX Normal Mode Screen ............................................................................................3-1
Figure 3-2. GTN 7XX Normal Mode Screen ............................................................................................3-1
Figure 3-3. GTN Software Updater ...........................................................................................................3-2
Figure 3-4. System and Software Version .................................................................................................3-3
Figure 3-5. GTN Software Loader Card Formatting .................................................................................3-3
Figure 3-6. Update Progress Window .......................................................................................................3-4
Figure 3-7. Update Completion .................................................................................................................3-4
Figure 3-8. GTN 6XX and GTN 7XX Configuration Mode Pages ...........................................................3-6
Figure 3-9. GTN 7XX Updates Page .........................................................................................................3-7
Figure 3-10. System Information Page ......................................................................................................3-8
Figure 3-11. GTN 7XX Setup Pages .........................................................................................................3-9
Figure 3-12. GTN 7XX Options Pages ....................................................................................................3-11
Figure 3-13. GTN 7XX TAWS Configuration Page ...............................................................................3-12
Figure 3-14. Chart Configuration Page ...................................................................................................3-13
Figure 3-15. COM Transmit Power Configuration Page .........................................................................3-14
Figure 3-16. Weather Radar Page ............................................................................................................3-15
Figure 3-17. GTN 6XX and 7XX Diagnostics Pages ..............................................................................3-17
Figure 4-1. TVS Assembly Check .............................................................................................................4-8
Figure 5-1. Failure Screen .........................................................................................................................5-5
Figure 5-2. GMA 35 Failure Annunciation .............................................................................................5-20
Figure 6-1. GTN 7XX Mounting Rack Assembly .....................................................................................6-2
Figure 6-2. GTN 6XX Mounting Rack Assembly .....................................................................................6-3
Figure 6-3. GMA 35 Mounting Rack Assembly Overview ......................................................................6-6
Figure 6-4. Backshell Assembly (Potted Configuration Module) ...........................................................6-11
Figure 6-5. Backshell Assembly (Configuration Module with Spacer) ..................................................6-12
Figure 6-6. Fan/Backplate Orientation (GTN 7XX) ...............................................................................6-13
Figure 6-7. Fan Wiring Replacement ......................................................................................................6-15
Figure 6-8. TVS/Fuse Replacement (TVS1/F1) ......................................................................................6-17
Figure 6-9. Detail of TVS Pin Assembly .................................................................................................6-18
Figure 6-10. TVS2 Assembly ..................................................................................................................6-19
Figure 6-11. GPS/SBAS Antenna Cable Overbraid ..............................................................................6-21
Figure 6-12. WXR HSDB Cable Overbraid Details ................................................................................6-25
Figure 7-1. Audio Panel Page ....................................................................................................................7-6
Figure 7-2. Main Indicator (Analog) Configuration Page .......................................................................7-10
Figure 7-3. VOR/LOC/GS Configuration Page .......................................................................................7-11
Figure 7-4. XPDR1 Configuration Page ..................................................................................................7-18
Figure 7-5. Audio Configuration Page ....................................................................................................7-23
Figure 7-6. TAWS Configuration Page ...................................................................................................7-23

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
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LIST OF TABLES
Table 3-1. GTN Database Summary .......................................................................................................3-19
Table 4-1. Periodic Maintenance ...............................................................................................................4-2
Table 5-1. GTN Troubleshooting Guide ...................................................................................................5-1
Table 5-2. Alert Text Troubleshooting Guide ...........................................................................................5-6
Table 5-3. COM Alert Troubleshooting Guide .........................................................................................5-9
Table 5-4. GPS/SBAS Alert Troubleshooting Guide ..............................................................................5-11
Table 5-5. VLOC/GS Alert Troubleshooting Guide ...............................................................................5-12
Table 5-6. Remote Transponder Alert Troubleshooting Guide ...............................................................5-13
Table 5-7. GAD 42 Alert Troubleshooting Guide ...................................................................................5-14
Table 5-8. Traffic Alert Troubleshooting Guide .....................................................................................5-14
Table 5-9. Database Alert Troubleshooting Guide ..................................................................................5-15
Table 5-10. Weather Radar Alert Troubleshooting Guide ......................................................................5-16
Table 5-11. TAWS Alert Troubleshooting Guide ...................................................................................5-17
Table 5-12. Third-Party Sensor Alert Troubleshooting Guide ................................................................5-18
Table 5-13. GMA 35 Troubleshooting ....................................................................................................5-19
Table 5-14. Remote Audio Panel Alert Troubleshooting Guide .............................................................5-20
Table 6-1. Self Test Values .......................................................................................................................6-4
Table 6-2. Configuration Module Wire Color Reference Chart ..............................................................6-10
Table 6-3. Configuration Module Kit 011-00979-03 (P1001) ................................................................6-11
Table 6-4. Configuration Module Kit 011-00979-00 (P1001) ................................................................6-12
Table 6-5. Fan Kit ....................................................................................................................................6-14
Table 6-6. Fan Cable Wire Color Reference Chart .................................................................................6-14
Table 7-1. Configuration and Checkout Procedures ..................................................................................7-2
Table A-1. General Information about Installation ..................................................................................A-1
Table A-2. Equipment Locations ............................................................................................................A-11
Table A-3. GTN #1 Interfaced Equipment .............................................................................................A-13
Table A-4. GTN #2 Interfaced Equipment .............................................................................................A-15
Table A-5. Equipment Interfaced to the GMA 35 Audio Panel .............................................................A-17

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
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1 INTRODUCTION
1.1 Content, Scope and Purpose
This document provides Instructions for Continued Airworthiness (ICA) for the GTN 6XX/7XX and
GMA 35 as installed under STC SA02019SE-D. This document satisfies the requirements for continued
airworthiness as defined by 14 CFR Part 23.1529 and 14 CFR Part 23 Appendix G. Information in this
document is required to maintain the continued airworthiness of the GTN 6XX/7XX and GMA 35.
1.2 Organization
The following outline briefly describes the organization of this manual:
Section 2: System Description
Provides a description of the equipment installed by STC SA02019SE-D. An overview of the GTN and
GMA 35 system interface is also provided.
Section 3: GTN Control and Operation
Presents basic control and operation information specifically tailored to maintenance practices. Basic GTN
Configuration Mode operation is also described as well as loading of software.
Section 4: Instructions for Continued Airworthiness
This section provides maintenance instructions for continued airworthiness of the GTN and GMA 35
systems.
Section 5: Troubleshooting
This section provides troubleshooting information to aid in diagnosing and resolving potential problems
with the GTN and GMA 35 equipment.
Section 6: Equipment Removal & Replacement
This section provides instructions for the removal and replacement of the GTN and GMA 35 equipment.
Section 7: Equipment Configuration & Testing
This section provides instructions for the configuration and testing of the GTN and GMA 35 equipment.
Section 8: System Return to Service Procedure
This section specifies return-to-service procedures to be performed upon completion of maintenance of the
GTN and GMA 35 equipment.

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page 1-2 Rev. 5
1.3 Definitions and Abbreviations
The following terminology is used within this document:
AC: Alternating Current
ADS-B: Automatic Dependent Surveillance Broadcast
AGC: Automatic Gain Control
AGCS: Automatic Ground Clutter Suppression
AHRS: Altitude and Heading Reference System
AML: Approved Model List
BIT: Built-In Test
CDI: Course Deviation Indicator
CFR: Code of Federal Regulations
COM: Communications
CRG: Cockpit Reference Guide
CSA: Conflict Situational Awareness
DME: Distance Measuring Equipment
EFIS: Electronic Flight Instrument System
EHSI: Electronic Horizontal Situation Indicator
FIS-B: Flight Information Services Broadcast
FPGA: Field-Programmable Gate Array
G/S: Glideslope
GAD: Garmin Interface Adapter
GDL: Garmin Datalink
GMA: Garmin Audio Panel
GNS: Garmin Navigation System
GPS: Global Position System
GSR: Garmin Services
GTN: Garmin Touch Navigator
GWX: Garmin Weather Radar
HSDB: High-Speed Data Bus
ICA: Instructions for Continued Airworthiness
ICS: Intercom System
IFR: Instrument Flight Rules
ILS: Instrument Landing System
IRU: Inertial Reference Unit
LED: Light Emitting Diode
LOC: Localizer
LOI: Loss of Integrity
LRU: Line Replaceable Unit
MHz: Mega-Hertz
NAV: Navigation
OBS: Selected Course
PA: Passenger Address

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
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PTC: Push-to-Command
PTT: Push-to-Talk
R/T: Radar Transceiver
RF: Radio Frequency
RMI: Bearing to Waypoint
RX: Receive
SBAS: Satellite Based Augmentation System
SDI: Source/Destination Identifiers
SSM: Sign/Status Matrix
STC: Supplemental Type Certificate
TAS: Traffic Advisory System
TCAS: Traffic Collision Avoidance System
TAWS: Terrain Awareness System
TCAD: Traffic Collision Avoidance Device
TIS: Traffic Information Service
TSO: Technical Standard Order
TVS: Transient Voltage Suppressors
TX: Transmit
UTC: Coordinated Universal Time
VDC: Volts Direct Current
VFR: Visual Flight Rules
VHF: Very High Frequency
VOR: VHF Omni-directional Range
WAAS: Wide Area Augmentation System
WXR: Weather Radar
XPDR: Transponder
1.4 Publications
Part Number Garmin Document
005-00533-C0 Master Drawing List, GTN 6XX/7XX
005-00533-C1 GTN 6XX/7XX Equipment List
190-01007-A2 Supplemental Airplane Flight Manual for the Garmin GTN 6XX/7XX
GPS/SBAS Navigation System
190-01007-A5
Supplemental Airplane Flight Manual for Garmin GTN 6XX/7XX GPS/
SBAS Navigation System (GPS Functions Not Approved for IFR
Navigation)
190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
190-01007-E1 GTN 6XX/7XX Installation Checklist

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page 1-4 Rev. 5
1.5 Distribution
This document is required for maintaining the continued airworthiness of the aircraft. When this document
is revised, every page will be revised to indicate the current revision level. Garmin Dealers may obtain the
latest revision of this document on the Garmin Dealer Resource Center website.
Owner/operators may obtain the latest revision of this document from www.flyGarmin.com or by
contacting a Garmin dealer. Other contacts include Garmin Product Support at 913-397-8200 (toll free
866-739-5687) or using around the world contact information on www.flyGarmin.com.
A Garmin Service Bulletin describing the revision to this document will be sent to Garmin dealers if the
revision is determined to be significant.

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 5 Page 2-1
2 SYSTEM DESCRIPTION
2.1 Equipment Descriptions
2.1.1 GTN 6XX/7XX Navigators and GMA 35
The GTN (Garmin Touch Navigation) WAAS navigators are a family of aviation panel mounted retro-fit
products. The following sections will describe the available functions for each unit in the GTN 6XX/7XX
navigators.
2.1.1.1 GTN 6XX
The GTN 6XX WAAS navigators are a family of panel-mounted GPS/NAV/COM navigators.
The GTN 6XX units include the GTN 625, GTN 635, and GTN 650. They are 6.25 inches wide and 2.65
inches tall. The GTN 6XX features a 600 by 266 pixel color LCD touchscreen. The GTN 625 is a GPS/
SBAS unit that meets the requirements of Technical Standard Order TSO-C146c and may be approved for
IFR en route, terminal, oceanic, non-precision, and precision approach operations when installed in
accordance with the instructions in the manuals referenced in the GTN AML STC. The
GTN 635 includes all of the features of the GTN 625 in addition to an airborne VHF communications
transceiver. The GTN 650 includes all of the features of the GTN 625 in addition to an airborne VHF
communications transceiver and airborne VOR/localizer (LOC) and glideslope (G/S) receivers.
2.1.1.2 GTN 7XX
The GTN 7XX WAAS navigators are a family of GPS/NAV/COM aviation panel-mounted products. The
GTN 7XX units include the GTN 725 and GTN 750. The GTN 7XX units are 6.25 inches wide and 6.00
inches tall. They feature a 600 by 708 pixel color LCD touchscreen. The GTN 725 is a GPS/SBAS unit
that meets the requirements of Technical Standard Order TSO-C146c and may be approved for IFR en
route, terminal, oceanic, non-precision, and precision approach operations when installed in accordance
with the instructions in the manuals referenced in the GTN AML STC. The GTN 750 includes all of the
features of the GTN 725 in addition to an airborne VHF communications transceiver and airborne VOR/
localizer (LOC) and glideslope (G/S) receivers. The GTN 725 and 750 also have the ability to remotely
control GMA 35 audio panel functions.
2.1.1.3 GMA 35 Audio Panel
The GMA 35 audio panel is both a marker beacon receiver and an audio panel with 6-place intercom that
interfaces to the communications and navigation radios, headsets, microphones, and speakers. The
GMA 35 is remote-mounted and relies upon the GTN 725 or GTN 750 to control and display the audio
functions.
The GMA 35 interfaces to the GTN 7XX via RS-232 for control and display of audio panel functions.
Additionally, the GMA 35 includes a six-position intercom system (ICS) with electronic cabin noise de-
emphasis, two stereo music inputs, and independent pilot, copilot, and passenger volume controls. The
intercom provides three selectable isolation modes. A pilot-selectable cabin speaker output can be used to
listen to the selected aircraft radios or to broadcast PA announcements.
2.1.2 NAV Antenna Cable Splitter
The navigation antenna cable splitter (Garmin P/N 013-00112-00) is used for installations involving dual
VHF navigation capable GTNs or a single VHF navigation capable GTN installation with a second
non-Garmin aviation unit.
2.1.3 NAV Antenna Cable Diplexer
The GTN 650/750 navigation units have a single navigation antenna port and thus require a composite
signal for those installations which include separate VOR/LOC and G/S antennas. The navigation diplexer
(Comant diplexer VOR/GS, Model CI-507) is used for these installations.

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page 2-2 Rev. 5
2.2 Backplate Connectors
Figure 2-1. GMA 35 Connector Layout Detail - Rear View
Figure 2-2. GTN 650 Connector Layout Detail - Rear View

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 5 Page 2-3
Figure 2-3. GTN 750 Connector Layout Detail - Rear View

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page 2-4 Rev. 5
2.3 GTN Optional Interfaces
Optional equipment interfaces include:
Audio Panel
Air Data Computer
Altitude Serializer or Fuel/Air Data Computers
Autopilot
EFIS Displays
EHSI Displays
IRU/AHRS
Navigation Indicators
Weather, Traffic, Terrain Systems
DME
CDI/HSI Source Selection Annunciators
TAWS Annunciator Panels
Multifunction Displays
Interface Adapters
Synchro Heading Sources
Weather Radar
Iridium Transceiver
ADS-B Traffic and FIS-B Weather Sources

190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 5 Page 2-5
2.4 GTN Block Diagram
Figure 2-4. GTN System Interface Diagram
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1
Page 2-6 Rev. 5
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