Instruction/ maintenance manual of the product GTX 320 ATC Garmin
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GTX 320 A TC TRANSPONDER MAINTENANCE MANUAL 190-00133-02 (Rev B) GARMIN 1200 E. 151st Street Olathe, KS 66062 USA 16 March 1999 ®.
190-00133-02 Rev B A ® This publication is the property of GARMIN. It may not be reproduced or transmitted in any form whether printed or electronic, without the expressed written consent of GARMIN International. GARMIN 1200 E. 151st Street Olathe, KS 66062 USA T elephone: 913-397-8200 or 1-800-800-1020 www .
190-00133-02 Rev B i T ABLE OF CONTENTS SECTION 1 DESCRIPTION AND OPERA TION P ARAGRAPH PA G E 1.1 INTRODUCTION ............................................................................................................... 1 -1 1.2 GENERAL DESCRIPTION .
190-00133-02 Rev B 1-1 SECTION 1 DESCRIPTION AND OPERA TION 1.1 INTRODUCTION This manual provides all of the procedures, principles of operation, and information necessary to repair and maintain the GARMIN GTX 320 A TC T ransponder . Refer to GARMIN Installation Manual P/N 190-00133-01 for installation and operating information.
190-00133-02 Rev B 1-2 Figure 1-1. A TCRBS System 1.4 EQUIPMENT DESCRIPTION The GTX 320 consists of two major assemblies, the Main PCB Assembly and the Front Subassembly .
190-00133-02 Rev B 1-3 1.5 SCOPE OF MAINTENANCE Due to the overall complexity of the unit, GARMIN recommends limiting field maintenance to the following: Removal and Replacement of the Front Subas.
190-00133-02 Rev B 2-1 SECTION 2 SPECIAL TEST EQUIPMENT 2.1 INTRODUCTION This section identifies the special tools and test equipment essential to repair the GTX 320. S tandard equipment is not listed. For any questions regarding special tools and test equipment contact the GARMIN Customer Service Department at the address listed on Page A.
190-00133-02 Rev B 2-2 2.3.3 Antenna T est Cable Connector The antenna test cable incorporates a BNC connector at the test fixture antenna and a male BNC blindmate connec- tor (GARMIN P/N 330-00198-00) at the transponder . Figure 2-2 shows the connector .
190-00133-02 Rev B 2-3 Figure 2-3. T est Setup/T est Harness—J102.
190-00133-02 Rev B 3-1 SECTION 3 ALIGNMENT AND TESTING 3.1 INTRODUCTION This section of the manual consists of alignment and test procedures. Perform the following procedures to iden- tify failed units (troubleshooting) and after completing any repairs.
190-00133-02 Rev B 3-2 1. Carefully dislodge the thin metal piece that covers the access holes to the transmitter section (figure 3-1) by prying one end with a small, thin screwdriver .
190-00133-02 Rev B 3-3 Figure 3-1. C620 and C635 Location.
190-00133-02 Rev B 3-4 CAUTION Do not allow the transmitter to oscillate below 1080 MHz as indicated on the A TC-1400A T est Set or else damage may occur to the mixer . PARAMETER SPECIFIC ATION Frequen c y 1089.0 to 1090.0 MHz XMTR PWR 125 Watts Minimum through a –1.
190-00133-02 Rev B 3-5 3.3 TESTING Perform testing after completing transmitter frequency adjustment. 3.3.1 T est Equipment See paragraph 3.2.1. 3.3.2 T est Setup See figure 2-3. 3.3.3 T est Procedure 3.3.3.1 T urn-On Delay NOTE The test setup will not work if any toggle switch on the A TC-1400A is placed in the incorrect position.
190-00133-02 Rev B 3-6 3.3.3.4 Minimum T rigger Level Adjustment (MTL) 1. Set the PRF thumb wheel switches to 500 Hz. 2. Set the A TC -1400A XPDR MODE switch to position A . 3. Reduce the RF level on the A TC -1400A test set until the nominal reply rate is 90%.
190-00133-02 Rev B 3-7 PARAMETER SPECIFICATION Rise T ime: 50-100 nS Fall T ime: 50-200 nS Pulse Wid th: 350-550 nS Figure 3-2. Example Of Acceptable Reply Pulse 3.3.3.6 Dynamic Range 1. Set the GTX 320 mode select switch to the ON position. 2. Set the A TC 1400A SLS/ECHO thumb wheel switch to -9.
190-00133-02 Rev B 3-8 3.3.3.8 Side Lobe Suppression 1. Set the SLS / ECHO toggle switch to the OFF position. 2. Adjust the RF level on A TC -1400A to MTL so that the XPDR%REPL Y is 90%. 3. Raise the RF level to 3 dB above the MTL. 4. Set the SLS / ECHO thumb wheel switch to 0dB.
190-00133-02 Rev B 3-9 5. Successively turn-on each altitude toggle switch on the test panel. ______ OK 6. Altitude coded pulses shall appear between the P1 and P3 pulses as viewed on the oscilloscope and shown in F igure 3-4.
190-00133-02 Rev B 3-10 3.3.3.1 1 IDENT T est 1. Set the A TC -1400A to Mode A . 2. T urn the GTX 320 mode select knob to the ON position. 3. Set the RF level on the A TC -1400A for a 100% reply rate. 4. Press the IDENT button on the transponder . The unit shall cause the A TC -1400A XPDR Code display to read 1d0000 for approximately 20 seconds.
190-00133-02 Rev B 3-11 3.3.3.13 SBY (Stand By) Set the transponder mode select switch to the SBY position. The “SBY” nomenclature and the four reply code digits shall be illuminated with a higher intensity than the “OFF”, “ON”, “AL T” and “TST” nomenclature.
190-00133-02 Rev B 3-12 3.3.3.17 Front Panel T est - Reply Light 1. Rotate the Mode Select Switch from TST to AL T and with the unit not replying. Increase the RF level on the A TC-1400A above MTL so that the transponder has a reply rate above 90%. The triangle-shaped reply light shall turn on.
190-00133-02 Rev B 3-13 Figure 3-6. A TC 1400A T est Settings.
190-00133-02 Rev B 4-1 SECTION 4 DISASSEMBL Y AND REASSEMBL Y 4.1 INTRODUCTION This section covers only the disassembly that is necessary to remove a faulty Front Subassembly . Reverse the steps for assembly . 4.2 INSPECTION Perform the following inspection and cleaning before disassembly: 1.
190-00133-02 Rev B 4-2 Figure 4-1. Front Subassembly Installation 4.4 CLEANING After reassembly , clean the external surface of the transponder when inspection shows dirt, smudges, etc.
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