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400 SERIES
MAINTENANCE MANUAL
(GNS 430, GNC 420, GPS 400)
GNS 430 Shown
GARMIN International, Inc.
st
1200 E. 151 Street
Olathe, KS 66062 USA
190-00140-05, Revision C
October 2002
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© Copyright 1999-2002 GARMIN Ltd. or its subsidiaries All Rights Reserved GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. GARMIN (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K. GARMIN Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose
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LIST OF EFFECTIVE PAGES Page Revision Page Revision Page Revision Page Revision A C 4-8 C 5-54 BLANK F7-24 BLANK i C 5-1 C 6-1 C A-1 C ii C5-2 C6-2 CA-2 C iii C5-3 C6-3 CB-1 C iv C5-4 C6-4 CB-2 C v C 5-5 C 6-5 C B-3 C vi C5-6 C6-6 CB-4 C vii C 5-7 C 6-7 C B-5 C viii C5-8 C6-8 CB-6 C ix C5-9 C6-9 CB-7 C x C 5-10 C 6-10 C B-8 C xi C 5-11 C 6-11 C B-9 C xii C 5-12 C 6-12 C B-10 C 1-1 C 5-13 C 6-13 C B-11 C 1-2 C 5-14 C 6-14 C B-12 C 1-3 C 5-15 C 6-15 C B-13 C 1-4 C 5-16 C 6-16 C B-14 C 1-5 C 5-17 C
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The following are General Safety Precautions that are not related to any specific procedure and therefore do not appear elsewhere in this maintenance manual. These are recommended precautions that personnel should understand and apply during the many phases of maintenance and repair. KEEP AWAY FROM LIVE CIRCUITS. Maintenance personnel shall observe all safety regulations at all times. Do not replace components inside the equipment when potentially lethal voltages are present. Turn off system
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TABLE OF CONTENTS SECTION 1 DESCRIPTION AND OPERATION Paragraph Page 1.1 INTRODUCTION ....................................................................................................1-1 1.1.1 Versions Covered by this Manual....................................................................1-1 1.2 FUNCTIONAL SUMMARY......................................................................................1-3 1.2.1 GPS 400............................................................................
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SECTION 3 TROUBLESHOOTING Paragraph Page 3.1 TROUBLESHOOTING EQUIPMENT .....................................................................3-1 3.2 TROUBLESHOOTING ORDER..............................................................................3-1 3.3 TROUBLESHOOTING PROCEDURES .................................................................3-2 3.3.1 Fuses...............................................................................................................3-2 3.3.2 Power Supply Chec
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SECTION 5 ALIGNMENT, CALIBRATION, AND TESTING Paragraph Page 5.1 INTRODUCTION .................................................................................................5-1 5.2 RECOMMENDED TEST EQUIPMENT ...............................................................5-1 5.3 TEST SETUP.......................................................................................................5-3 5.4 STANDARD SIGNALS AND TEST LOADS.........................................................5-3 5.4.1
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SECTION 5 ALIGNMENT, CALIBRATION, AND TESTING (continued) 5.7.2.8 Sidetone ........................................................................................................5-18 5.7.2.9 MIC Intercom Test.........................................................................................5-18 5.7.2.10 Receiver Sensitivity.......................................................................................5-18 5.7.2.11 TX Interlock ......................................................
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SECTION 5 ALIGNMENT, CALIBRATION, AND TESTING (continued) 5.7.4 Navigation Assembly I/O Tests ....................................................................5-32 5.7.4.1 Localizer Course Deviation Test ...................................................................5-32 5.7.4.2 To/From Deflection Output Characteristic Test .............................................5-32 5.7.4.3 To/From Deflection Accuracy Test ................................................................5-32 5.7.4.4
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SECTION 5 ALIGNMENT, CALIBRATION, AND TESTING (continued) 5.7.6.14 MAIN Vertical UP, DOWN Outputs................................................................5-47 5.7.6.15 MAIN To/From Output ...................................................................................5-47 5.7.6.16 MAIN Lateral Flag Output..............................................................................5-48 5.7.6.17 MAIN Vertical Flag Output...................................................................
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APPENDIX A GNC 420A AND GNS 430A A.1 DESCRIPTION ....................................................................................................A-1 A.2 ‘A’ VERSION PART NUMBERS ..........................................................................A-1 A.3 TROUBLESHOOTING.........................................................................................A-1 A.4 DISASSEMBLY AND ASSEMBLY.......................................................................A-2 A.5 ALIGNMENT, CALIBRATIO
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LIST OF FIGURES Figure Page 2-1 Com Chassis Nut.................................................................................................2-1 2-2 Signal And Load Drawing-J1 (Sheet 1 of 2) ........................................................2-3 2-3 Signal And Load Drawing-J1 (Sheet 2 of 2) ........................................................2-5 2-4 Signal And Load Drawing-J2 ...............................................................................2-7 2-5 Signal And Load Drawin
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LIST OF TABLES Table Page 1-1 Unit Configuration ................................................................................................1-1 3-1 Unit Board Power Supply Max Current Allowed ..................................................3-5 3-2 Com Board Power Supply Tolerances.................................................................3-5 3-3 Glideslope Board Power Supply Tolerances .......................................................3-6 3-4 Nav Board Power Supply Tolerances..
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LIST OF TABLES (con’t.) Table Page 6-25 Sub-Assy, CDU, GNC 420, Black (Unit P/N 011-00281-01, Figure 7-4) ...........6-23 6-26 Sub-Assy, CDU, GNC 420, Gray (Unit P/N 011-00281-05, Figure 7-4) ............6-24 6-27 Sub-Assy, CDU GNC 420A, Black (Unit P/N 011-00281-01, Figure 7-4).........6-25 6-28 Sub-Assy, CDU, GNC 420A, Gray (Unit P/N 011-00281-05, Figure 7-4)..........6-26 6-29 Sub-Assy, GPS 400, 14/28V Black (Unit P/N 011-00504-00, Figure 7-1) .........6-27 6-30 Sub-Assy, GPS 400, 14/28V Gr
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SECTION 1 DESCRIPTION AND OPERATION 1.1 INTRODUCTION References made to the GNS 430 and the GNC 420 throughout this manual equally apply to the GNS 430A and the GNC 420A except where specifically noted. This manual provides board-level maintenance information for the GARMIN 400 Series of products. Table 1-1 shows each unit in the 400 series and their configurations. The system allows the Main Processor software to recognize which of the optional components (VHF Communications Transceiver, VOR/L
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GPS 400: UNIT P/N COLOR 011-00504-00 Black 011-00504-10 Gray GNC 420: UNIT P/N COLOR OPERATING MINIMUM VOLTAGE XMIT PWR 011-00506-00 BLACK 28 V 10 W 011-00506-10 BLACK 14 or 28 V 10 W 011-00506-30 GRAY 14 or 28 V 10 W GNS 430: UNIT P/N COLOR OPERATING MINIMUM VOLTAGE XMIT PWR 011-00280-00 BLACK 28 V 10 W 011-00280-10 BLACK 14 or 28 V 10 W 011-00280-30 GRAY 14 or 28 V 10 W GNC 420A: UNIT P/N COLOR OPERATING MINIMUM VOLTAGE XMIT PWR 011-00837-00 BLACK 28 V only 16 W 011-00837-10 GRAY 28 V only
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Each of the configurations includes a color display providing graphical moving map capability. Navigation, communication, and mapping functions are supported by a navigation database provided by a removable database card. The mapping function has additional support provided by a built-in ground features base map which may be supplemented by a detailed map provided on a second removable database card. Information relative to the installation and operation of the 400 Series is found in the 400 Se
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1.3 REPAIR PLAN This manual is designed to allow the user to perform board-level repair. If necessary, the unit can be returned to GARMIN for complete service work. Contact GARMIN at the address given on Page A (inside cover) for further service information. 1.4 SPECIFICATIONS Technical specifications for each unit are given in the 400 Series Installation Manual, P/N 190-00140-02. 1.5 GENERAL DESCRIPTION To help understand the general description, Appendix B lists all external and internal I/O
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1.5.2 Com Board The Com Board contains the VHF COM Transceiver that provides voice communication in the 118.000 to 136.992 MHz general aviation band. The transceiver consists of a 10 or 16 watt (“A” versions) amplitude modulated transmitter (see the unit matrix tables on page 1-1), and a single conversion superhetrodyne AM receiver. The 10 watt transmitters are Class 4 and 6 devices as described in RTCA DO-186A, indicating that they have channel spacing modes of 25 kHz and 8.33 kHz, and are i
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1.5.5 Glideslope Board The Glideslope Board contains a processor controlled Glideslope Receiver which operates from 329.15 MHz to 335.00 MHz in 150 kHz increments for 40 Glideslope channels. 1.5.6 Inverter Board The Inverter Board supplies high voltage for display operation. 1.5.7 CDU Assembly The main components of the CDU Assembly are the Liquid Crystal Display (LCD), Keyboard Assembly, and the Interface Board. The display portion consists of a 3-color RGB DSTN type LCD, 128 x 240 pixels. The
