Garmin GNC 420 Maintenance Manual Download

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GNS 430 Shown

GARMIN International, Inc.

1200 E. 151

Street

Olathe, KS 66062 USA

190-00140-05, Revision C

October 2002

400 SERIES

MAINTENANCE MANUAL

(GNS

430, GNC

420, GPS 400)

Summary of Contents for GNC 420

Page 1: ...GNS 430 Shown GARMIN International Inc 1200 E 151st Street Olathe KS 66062 USA 190 00140 05 Revision C October 2002 400 SERIES MAINTENANCE MANUAL GNS 430 GNC 420 GPS 400...

Page 2: ...s 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 unauth...

Page 3: ...B 17 C 2 2 BLANK 5 20 C 6 20 C B 18 C F2 3 C 5 21 C 6 21 C F2 4 BLANK 5 22 C 6 22 C F2 5 C 5 23 C 6 23 C F2 6 BLANK 5 24 C 6 24 C F2 7 C 5 25 C 6 25 C F2 8 BLANK 5 26 C 6 26 C F2 9 C 5 27 C 6 27 C F2...

Page 4: ...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...

Page 5: ...3 1 2 2 GNC 420 1 3 1 2 3 GNS 430 1 3 1 3 REPAIR PLAN 1 4 1 4 SPECIFICATIONS 1 4 1 5 GENERAL DESCRIPTION 1 4 1 5 1 Main Board 1 4 1 5 2 Com Board 1 5 1 5 3 Nav Board 1 5 1 5 4 GPS Module 1 5 1 5 5 Gli...

Page 6: ...FAILURES 3 10 3 6 EXTERNAL CONNECTORS 3 15 3 7 CONNECTOR I O DESCRIPTIONS 3 15 3 8 BLOCK DIAGRAM 3 15 SECTION 4 DISASSEMBLY AND ASSEMBLY Paragraph Page 4 1 INTRODUCTION 4 1 4 2 REQUIRED TOOLS 4 1 4 3...

Page 7: ...ard Signals 5 6 5 4 4 1 Standard Test Signals 5 6 5 4 5 Localizer Standard Signals 5 7 5 4 5 1 Standard Test Signals 5 7 5 5 ALIGNMENT 5 9 5 6 CALIBRATION 5 9 5 6 1 Com Setup Page Fields 5 10 5 6 1 1...

Page 8: ...Transfer Input 5 24 5 7 3 Navigation Receiver Final Tests 5 25 5 7 3 1 Voice Ident Audio Output Level 5 25 5 7 3 2 Voice Ident Audio Frequency Response 5 25 5 7 3 3 Voice Ident Audio Distortion 5 26 5...

Page 9: ...ut Characteristic Test 5 37 5 7 5 2 Course Deviation Deflection Accuracy Test 5 37 5 7 5 3 Course Deviation Flag Test 5 37 5 7 5 4 Glideslope Superflag Output Test 5 38 5 7 5 5 Receiver Sensitivity 5...

Page 10: ...put 5 48 5 7 6 18 MAIN Lateral Super Flag Output 5 48 5 7 6 19 MAIN Vertical Super Flag Output 5 48 5 7 6 20 Annunciate Outputs 5 49 5 7 6 21 OBI Serial Interface 5 50 5 7 6 22 Discrete Switch and Alt...

Page 11: ...7 ASSEMBLY DRAWING A 2 APPENDIX B CONNECTOR I O DESCRIPTIONS B 1 I O DESCRIPTION B 1 B 2 INTERNAL AND EXTERNAL CONNECTORS B 1 B 3 MAIN BOARD CONNECTORS B 2 B 4 COM BOARD CONNECTORS B 11 B 5 NAV BOARD...

Page 12: ...t Page 5 32 5 7 Main Lighting and Main Analog Test Pages 5 44 5 8 GPS Test Page 5 45 5 9 Main CDI OBS Configuration Test Page 5 47 5 10 Main Discrete Outputs Test Page 5 49 5 11 Main Discrete Inputs T...

Page 13: ...2 6 8 6 8 Main Chassis Assy GNS 430 28V Unit P N 011 00283 00 Fig 7 2 6 9 6 9 Main Chassis Assy GNS 430A 28V Unit P N 011 00283 20 Figure 7 2 6 10 6 10 Nav Chassis Sub Assy GNS 430 430A Unit P N 011...

Page 14: ...is Sub Assy GPS 400 Unit P N 011 00281 03 Fig 7 7 6 28 6 34 Sub Assembly CDU GPS 400 Black Unit P N 011 00281 03 Fig 7 4 6 29 6 35 Sub Assembly CDU GPS 400 Gray Unit P N 011 00281 06 Fig 7 4 6 30 A 1...

Page 15: ...e which of the optional components VHF Communications Transceiver VOR LOC receivers and Glideslope receiver are present Table 1 1 Unit Configuration GPS 400 GNC 420 GNS 430 Main Processor GPS Receiver...

Page 16: ...011 00506 30 GRAY 14 or 28 V 10 W GNS 430 UNIT P N COLOR OPERATING VOLTAGE MINIMUM 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...

Page 17: ...ng signals transmitted by Global Positioning System GPS Satellites Display of the stored navigation and map database for use by the pilot flight crew Area navigation functions using the determined pos...

Page 18: ...e 3 7 for a block diagram which shows all of the external and internal connectors for each board 1 5 1 Main Board The Main Board is the functional center of the unit The Main Board communicates with a...

Page 19: ...essor controlled navigation receiver for VOR and Localizer signals from 108 00 MHz to 117 95 MHz in 50 kHz increments providing 200 channels Functionally the Nav Board performs the following 1 Tunes a...

Page 20: ...CD Keyboard Assembly and the Interface Board The display portion consists of a 3 color RGB DSTN type LCD 128 x 240 pixels The keyboard assembly consists of the snap dome keys photocell and LED s for b...

Page 21: ...Telephone 913 397 8200 Aviation Panel Mount Technical Support Line Toll Free 1 888 606 5482 Website Address www garmin com 2 2 SPECIAL TOOLS AND TEST EQUIPMENT x Test Panel See paragraph 2 3 x Test Ca...

Page 22: ...Page 2 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 This page left intentionally blank...

Page 23: ...400 SERIES MAINTENANCE MANUAL Page 2 3 Page 2 4 blank P N 190 00140 05 Rev C Figure 2 2 J1 Signal and Load Drawing Sheet 1 of 2...

Page 24: ...400 SERIES MAINTENANCE MANUAL Page 2 5 Page 2 6 blank P N 190 00140 Rev C Figure 2 3 J1 Signal and Load Drawing Sheet 2 of 2...

Page 25: ...400 SERIES MAINTENANCE MANUAL Page 2 7 Page 2 8 blank P N 190 00140 05 Rev C Figure 2 4 J2 Signal and Load Drawing...

Page 26: ...400 SERIES MAINTENANCE MANUAL Page 2 9 Page 2 10 blank P N 190 00140 05 Rev C Figure 2 5 J6 Signal and Load Drawing...

Page 27: ...ge ii 3 1 TROUBLESHOOTING EQUIPMENT The equipment used in testing a unit can be used to troubleshoot a faulty unit See Sections 2 and 5 3 2 TROUBLESHOOTING ORDER Start troubleshooting a unit by follow...

Page 28: ...3 3 1 Fuses Check for blown fuses on the Main Board Com Board and Nav Board as shown in Figures 3 1 through 3 4 If blown fuses are found try to determine the cause of the fuse failure before installin...

Page 29: ...Rev C LOCATION OF F600 7A FUSE ON 00 02 03 COM BOARDS Figure 3 2 Com Board Fuse Location F600 LOCATION OF F600 ON 04 REV C COM BOARDS TO PRESENT F600 REPLACED WITH R611 EXCEPT ON 04 REV A AND B BOARD...

Page 30: ...on cable and spread the cable wires then use a DC probe to measure the current in the appropriate wire connector pin The following external and intra board current measurements can be taken during tro...

Page 31: ...6 GNS 430A ON RX 1 17 TX 3 98 3 3 2 2 Com Board Replace the Main Board if any voltage on the Com Board is not within tolerance Replace the Com Board if excessive current is measured Table 3 2 Com Boar...

Page 32: ...0 1100 3 3 3 Processor Clock Check 3 3 3 1 Internal Clock Check Main Processor Measure the clock speed of the Main Processor located on the Main Board Figure 3 5 by placing an oscilloscope probe at I...

Page 33: ...erational status using the messages listed in Table 3 5 These messages can help in isolating a faulty assembly Table 3 5 also shows the recommended action for each message Perform the recommended acti...

Page 34: ...aragraph 4 5 5 COM needs service Replace Com Board see paragraph 4 5 4 COM transmitter power has been reduced Verify that power input to J2 11 12 has not dropped below 26 V when transmitting before re...

Page 35: ...lace Flex Cable see paragraph 4 5 2 1 Replace Key Board see paragraph 4 5 2 Replace Main Board see paragraph 4 5 5 OBS key stuck Replace NAV Receiver see paragraph 4 5 6 COM is not responding Replace...

Page 36: ...place Rotary Knob see paragraph 4 5 2 1 Replace Main Board see paragraph 4 5 5 Map I D and Data Card Test 5 7 6 3 Replace Map Board see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 Photocell...

Page 37: ...Main Vertical Flag Output 5 7 6 17 Replace Main Board see paragraph 4 5 5 Main Lateral Super Flag Output 5 7 6 18 Replace Main Board see paragraph 4 5 5 Main Vertical Super Flag Output 5 7 6 19 Replac...

Page 38: ...Sidetone 5 7 2 8 Replace Com Board see paragraph 4 5 4 Mic Intercom Test 5 7 2 9 Replace Com Board see paragraph 4 5 4 Receiver Sensitivity 5 7 2 10 Replace Com Board see paragraph 4 5 4 TX Interlock...

Page 39: ...see paragraph 4 5 6 Nav Parallel DME Outputs 5 7 4 10 Replace Nav Receiver Board see paragraph 4 5 6 Table 3 9 Testing Failures Glideslope TEST FAILURE TEST PARAGRAPH RECOMMENDED ACTION G S Course Dev...

Page 40: ...Replace Nav Receiver Board see paragraph 4 5 6 VOR Flag Sensitivity 5 7 3 9 Replace Nav Receiver Board see paragraph 4 5 6 LOC Flag Sensitivity 5 7 3 10 Replace Nav Receiver Board see paragraph 4 5 6...

Page 41: ...23 24 25 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 6...

Page 42: ...Page 3 16 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 This page left intentionally blank...

Page 43: ...400 SERIES MAINTENANCE MANUAL Page 3 17 Page 3 18 blank P N 190 00140 05 Rev C Figure 3 7 400 Series Block Diagarm...

Page 44: ...2 Item 012 00256 00 Under normal operating conditions the voltages range up to 2500 V ac peak to peak Under open circuit conditions voltages can range over 8000 V ac peak to peak Remove all power to t...

Page 45: ...the unit Grasp the top and bottom surfaces of the swing arm handle between your thumb and forefinger and pull directly away from the face of the unit to unseat the connector and remove the NavData car...

Page 46: ...DISASSEMBLY PROCEDURE Because each unit is very similar in design only the GNS 430 disassembly procedure is given in this section The disassembly procedures are provided in modular sequence to enable...

Page 47: ...olding the Rotary Pots 3 and 4 to the Interface Board 5 and slide the Interface Board off the Pot Shafts x Remove the LCD Assembly Figure 7 4 Remove the four screws 2 holding the LCD Assembly 9 to the...

Page 48: ...0234 06 securing the Com Board 012 00214 XX to the Main Chassis 125 00034 01 5 Remove screw 211 60234 06 attaching the Posistor 925 D2120 00 to the Hex Standoff 214 00023 00 on one side of the transis...

Page 49: ...25 00034 01 5 Remove the five screws 211 60234 06 attaching the Main Board 012 00347 XX to the Main Chassis 125 00034 01 4 5 6 Remove Faulty Boards from the Nav Chassis x Nav Receiver Board Figure 7 3...

Page 50: ...attery to maintain user waypoints settings stored in RAM This battery has an operational life of up to 5 years Should the battery require replacement as indicated by the Memory Battery Low message par...

Page 51: ...Carefully remove the battery by pulling it out from the topside of the Main Board The battery leads are welded to the battery and cannot be removed 5 Install a new battery and solder the leads from th...

Page 52: ...nt damage to this equipment from Electro Static Discharge ESD Testing should only be accomplished in an approved ESD workstation by properly trained and grounded personnel Hazardous voltages exist on...

Page 53: ...ion ppm accuracy and the phase noise must be at least 104 5 dBc Hz 7 37 KHz offset for measuring the 8 33 kHz receiver selectivity The following equipment or suitable substitutes can be used in place...

Page 54: ...he repair station Load and signal information given in Section 2 and Appendix B can aid in the test setup 5 4 STANDARD SIGNAL AND TEST LOADS The following section describes the standard signal and loa...

Page 55: ...oad shall be 200 ohms 5 4 2 2 Standard Signals All RF input levels for the Glideslope receiver requirements are specified in dBm and do not require a 6 dB attenuator on the output of the signal genera...

Page 56: ...5 4 3 1 Standard Loads NAV Receiver Antenna The NAV receiver antenna J5 shall operate in a 50 ohm load NAV Course Deviation Deflection Load NAV LEFT One standard CDI deflection load shall be 1000 ohms...

Page 57: ...ll be 500 ohms connected between NAV AUDIO HI J6 16 and NAV AUDIO LO J6 17 5 4 4 VOR Standard Signals All RF input levels for the NAV receiver requirements are specified in dBm and do not require a 6...

Page 58: ...Standard Signals All RF input levels for the NAV receiver requirements are specified in dBm and do not require a 6 dB attenuator on the output of the signal generator provided the signal generator is...

Page 59: ...nal Standard localizer deviation test signal is a standard localizer test signal in which the difference in depth of modulation ddm of the 90 and 150 Hz signals is 0 093 0 002 A NAV LEFT output voltag...

Page 60: ...only For earlier versions of the board the mic gain is adjusted via potentiometer R558 Figure 5 3 Figure 5 2 Com Setup Page Follow these steps to put the unit in configuration mode 1 With power applie...

Page 61: ...nel spacing which is required in certain areas of the world 5 6 1 3 SQ 250 For GNS 430 units with serial number 96300200 or lower the operation of the SQ 250 setting is reversed The higher the SQ 250...

Page 62: ...sidetone audio output level The sidetone can be set to any value between zero and 63 The higher the number the greater the sidetone volume SIDETN ___________ OK 5 6 1 6 MIC Gain The MIC field sets the...

Page 63: ...specific test pages can be selected by ensuring the cursor is off and turning the small right knob Do not make changes on the test pages other than those required to perform the tests listed in this m...

Page 64: ...400 SERIES MAINTENANCE MANUAL Page 5 13 P N 190 00140 05 Rev C Figure 5 4 Test Pages...

Page 65: ...rwise specified set the receive channel to 127 000 MHz for 25 kHz channel mode and 127 005 MHz for 8 33 kHz channel mode Where no channel mode is specified perform the test at 127 000 MHz 25 kHz chann...

Page 66: ...3 75 VDC 10 W 14 28V units only in TX mode at Pins J2 11 and 12 4 Connect a wattmeter to the antenna output and record the following unmodulated values 118 50 MHz _________ 10 Watts Min 0 dB 127 50 MH...

Page 67: ...in 0 0005 5 PPM 136 50 MHz _________ Hz error 683 Hz 5 7 2 4 Modulation Capability Test 1 Apply a standard modulated test signal to the MIC audio input 2 Measure and verify the modulation is not less...

Page 68: ...Apply a standard mic input signal 2 Verify the combined total of distortion and noise in the demodulated output does not exceed 10 of the total demodulated output at modulation frequencies of 350 100...

Page 69: ...ressor 3 Apply a 125 mVrms 1 kHz audio signal to the intercom mic audio input Audio Level ________ 7 07 Vrms 4 Remove intercom audio input signal 5 7 2 10 Receiver Sensitivity 1 Disable the compressor...

Page 70: ...the unit to 127 000 MHz Vary the signal from 5 PV to 450mV 3 Set the volume for rated audio a7 07 Vrms 4 Verify the audio output does not vary by more than 6 dB 5 PV to 450mV ________dB 5 7 2 13 Selec...

Page 71: ...___VDC NGT AGC Reference Voltage 5 7 2 14 Selectivity 8 33 kHz Mode 1 Put unit in the 8 33 kHz mode 2 Tune to 127 000 MHz 3 Turn the modulation OFF on the RF Signal Generator 4 Turn the power volume c...

Page 72: ...7 2 2 Apply a 100 V 118 5 MHz 1 KHz tone modulated 30 signal to the unit 3 Select 118 500 MHz 4 Monitor the audio output 5 Turn the volume control fully clockwise 6 Verify a minimum of 7 07 Vrms at 5...

Page 73: ...sure the audio output in the 25 kHz channel mode 350 Hz ______ dB 1000 Hz ______ dB 1500 Hz ______ dB 2500 Hz ______ dB 5 Measure the audio output in the 8 33 kHz channel mode 350 Hz ______ dB 1000 Hz...

Page 74: ...LY increase the RF level until the squelch just breaks open and audio can be heard 6 Verify the RF signal generator level is between 1 and 4 V 1 5 6 V for 8 33 kHz 7 SLOWLY decrease the RF level until...

Page 75: ...is to be divided by 0 707 to yield the mathematical peak deviation 1 Modulate the transmitter with a standard modulator input signal 2 Verify the FM deviation does not exceed r1 kHz 118 005 MHz _____...

Page 76: ...into a 500 Ohm load that is not more than 63 mVpp 22 mVrms Audio Output Level_________ NGT 63 mVpp 5 7 3 2 Voice Ident Audio Frequency Response 1 Turn the ident filter off 2 With an RF input level of...

Page 77: ...d VOR audio test signal between the limits of 99 dBm and 13 dBm 2 Measure 500 VOR ILS AUDIO HI J6 16 with respect to 500 VOR ILS AUDIO LO GND J6 17 must be in IDENT mode to pass 1000 Hz tone set to a7...

Page 78: ...VOR ILS AUDIO LO J6 17 outputs set to a7 07 Vrms 4 Toggle between IDENT mode and VOICE mode and verify the ident voice ratio is greater than 20 dB Ident Voice Ratio __________ 20 dB 5 Apply a Standard...

Page 79: ...10 MHz at 103 5 dBM 2 Measure at the VOR LOC FLAG J6 3 and VOR LOC FLAG VOR LOC COMMON J6 4 outputs 3 Verify the VOR LOC FLAG output is not less than 260 mV VOR LOC FLAG Output ______ NLT 260 mV 4 Ap...

Page 80: ...J6 5 and VOR LOC RIGHT VOR LOC COMMON J6 6 outputs 3 Verify the magnitude of the course deviation output is greater than 50 45 mV of the nominal output 90 mV Course Deviation Output ________ 45 mV 5...

Page 81: ...e using the SELECTED COURSE field and calibrate the unit using the Calibrate to 150 field do this after the bearing is selected to 150 degrees Note that the angle displayed is rounded to one tenth of...

Page 82: ...gnal level of an undesired image frequency of 77 15 MHz required to produce a detector carrier AGC level obtained at the VOR LOC IF AGC J6 7 output with a 93 dBm Standard VOR Audio Test Signal is not...

Page 83: ...T J6 4 Full Right ___________ 150 15 mV Standard Right ___________ 90 9 mV Centered ___________ 0 4 5 mV Standard Left ___________ 90 9 mV Full Left________ 150 15 mV 5 7 4 2 To From Deflection Output...

Page 84: ...isplay Flag HIDE 2 Measure VOR LOC FLAG J6 3 with respect to VOR LOC FLAG J6 4 3 Verify the following output VOR LOC FLAG ______ 375 r80 mV 4 Display Flag IN VIEW 5 Measure VOR LOC FLAG J6 3 with resp...

Page 85: ...ates causes the appropriate status box to change states Remote Transfer _______ OK DME Common _______ OK DME Request _______ OK DME RNAV _______ OK 5 7 4 8 NAV OBI Outputs Monitor the VOR DISCRETE OUT...

Page 86: ...puts Monitor the VOR DISCRETE OUTPUTS Test Page and verify that toggling the below listed outputs between their active and inactive states causes the output voltage on the appropriate line to switch b...

Page 87: ...NANCE MANUAL Rev C P N 190 00140 05 PAR DME 2 MHz Low____ High ____ Input Switch must not be grounded for this test PAR DME 4 MHz Low____ High ____ Input Switch must not be grounded for this test PAR...

Page 88: ..._ mV 150 15 mV Greater than Full Scale Deflection 0 4 ddM input signal ________ mV 300 30 mV 5 7 5 2 Course Deviation Deflection Accuracy Test 1 With a standard deflection FLY DOWN condition 90 Hz dom...

Page 89: ...input level of a Standard Glideslope Deflection test signal which results in a maximum deviation of 60 of standard deflection 78 mV x 60 46 8 mV 1 Apply a glideslope standard deviation test signal to...

Page 90: ...33 dBm 4 Verify the course deviation is 0 r7 8 mV Course Deviation _________mV 5 Apply a glideslope deviation test signal to the unit 6 Measure GLIDESLOPE UP with respect to GLIDESLOPE DOWN GLIDESLOP...

Page 91: ...ge and use as a reference 3 Increase signal level to 33 dBm 4 Vary selected frequency r132 kHz 5 Verify the AGC voltage is less than the reference AGC voltage from step 2 AGC Reference Voltage______ d...

Page 92: ...____OK GLIDESLOPE EEPROM _____OK GLIDESLOPE Synthesizer Lock__________OK 2 The following status bits shall be good when a standard glideslope test signal is applied to the RF input of the glideslope r...

Page 93: ...sponse Turn the unit on in normal mode and push each button to verify appropriate unit response _____OK 5 7 6 2 Rotary Knobs Turn each rotary knob at least three turns in the same direction and verify...

Page 94: ...0 volts with an accuracy of 5 or 0 5 volts whichever is greater and a differential voltage of 5 Vrms at 400 Hz with and an accuracy of 5 or 0 5 volts whichever is greater For LIGHTING BUS HI J1 39 LIG...

Page 95: ...Inputs Test Page 4 To convert the displayed value to volts V value x 0 09299 Measured Value______ VDC 5 Verify measured value is 12 0 r5 VDC 6 Vary the input amplitude 14 V max and verify the display...

Page 96: ...ated when unit is off _____OK 2 Verify fan blade is moving and air is being blown out not sucked in by the fan when unit is on _____OK 5 7 6 9 Unit Configuration Test Apply power to the unit and verif...

Page 97: ...rn on the unit in Normal Mode Go to the Satellite Data Page see Pilot s Guide for instructions 4 Allow the unit to lock on to the satellites If the unit has current almanac data it will list the visib...

Page 98: ...__ 300 r15 mV CENTER ______ 0 r4 5 mV MAX RIGHT ______ 300 r15 mV 5 7 6 14 MAIN Vertical UP DOWN Outputs 1 Measure J1 27 output relative to J1 28 output Load 333 ohms three 1000 ohm loads across J1 27...

Page 99: ...sink 500 mA when attached to AIRCRAFT POWER J1 19 or 20 Note applicable output will source this current when active Note if the load is sized for 13 8 V 28 ohms 7W operation then this test should not...

Page 100: ...the Test Page For ANNUCIATOR PIN NAV VLOC J1 1 GPS J1 2 WAYPOINT J1 3 TERMINAL A J1 4 APPROACH B J1 5 MESSAGE J1 6 OBS J1 7 AUTO J1 8 INTEGRITY C J1 9 D J1 10 E J1 11 ALTITUDE ALARM J1 12 F J1 13 ILS...

Page 101: ...3 VDC max INACTIVE ______ NLT pull up voltage at minus 0 2V 5 7 6 21 OBI Serial Interface For SIGNAL NAME PIN GPS OBI CLOCK J1 43 GPS OBI DATA J1 44 GPS OBI SYNC J1 45 1 Use the Main Discrete Outputs...

Page 102: ...D4 J1 70 OBS MODE SELECT J1 71 CDI SOURCE SELECT J1 73 DEMO MODE SELECT J1 75 TEST MODE SELECT J1 76 1 Apply alternating loads levels to inputs 2 Monitor the test results via the Main Discrete Inputs...

Page 103: ...48 GPS ARINC 429 IN 1B J1 49 GPS ARINC 429 IN 2A J1 50 GPS ARINC 429 IN 2B J1 51 A 429 RX 1 LOWSPEED and HIGHSPEED 429 RX 2 LOWSPEED and HIGHSPEED 1 Test both 429 receivers and 429 transmitter 2 Conn...

Page 104: ...smitter to the receiver 3 Verify GPS RS232 1 OK via the test page _____OK B GPS RS232 2 1 Test both receiver and transmitter 2 Connect the transmitter to the receiver 3 Verify GPS RS232 2 OK via the u...

Page 105: ...ion page On this page monitor the current measured angle using the SELECTED COURSE field and calibrate the unit using the Calibrate to 150 field do this after the bearing is selected to 150 degrees No...

Page 106: ...trations in Section 7 for ease of identification GNS 430 430A Table Part Description Unit P N Figure 6 1 Sub Assy GNS430 28V Black 011 00280 00 7 1 6 2 Sub Assy GNS430 14 28V Black 011 00280 10 7 1 6...

Page 107: ...3 31 7 6 6 23 Main Chassis Assy GNC420A 28V 011 00283 21 7 6 6 24 Nav Chassis Sub Assy GNC420 420A 011 00282 01 7 7 6 25 Sub Assy CDU GNC420 Black 011 00281 01 7 4 6 26 Sub Assy CDU GNC420 Gray 011 00...

Page 108: ...0 00003 15 3 2 F850 Fuse SMT Fast 5 Amp 350 B0500 01 3 1 F853 Fuse 1206 0 75 Amp 350 B1075 00 3 1 F852 Fuse 1206 2 Amp 350 B1200 00 3 1 F851 Fuse 1206 3 Amp 350 B1300 00 3 1 R611 Resistor 1W 01 ohm 1...

Page 109: ...w NYL 2 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 6 325 00063 00 Ca Asy Rbn Ca Stp 2mm Ctrs 2x5 1 Table 6 2 Sub Assy GNS 430 14 28V Black Unit P N 011 00280 10 Figure 7 1 Part Number Part Name Qty 0...

Page 110: ...LHP100 SS P Nyl 6 253 00062 01 High Permb Shd 4 x6 Flat 1 253 00062 02 High Permb Shd 4 x2 25 Flat 1 325 00063 00 Rbn Ca Stp 2mm Ctrs 2x5 1 Table 6 4 Sub Assy GNS 430A 28V Black Unit P N 011 00836 00...

Page 111: ...has GNC400 1 115 00246 00 SMP Hinge GNC400 Front 1 115 00246 01 SMP Hinge GNC400 Rear 1 145 00480 02 PMP Bezel Cover GNS430 1 161 00201 11 Lbl S N GNS430A Gray 1 161 00422 00 Lbl Prot Bezel Cover Warn...

Page 112: ...ter Cvr GPS GNC500 1 125 00034 01 Main Chs s w o Stud GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 2 211 60234 11 Screw 4 40x 437 PHP SS P w N...

Page 113: ...ter Cvr GPS GNC500 1 125 00034 01 Main Chas s w o Stud GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 2 211 60234 11 Screw 4 40x 437 PHP SS P w...

Page 114: ...00034 01 Main Chs s w o Stud GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 1 211 60334 08 Screw 4 40x 250 PHP SS BO 3 211 63234 10 Scr 4 40x 3...

Page 115: ...uter Cvr GPS GNC500 1 125 00034 01 Main Chas w o Studs GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 2 211 60234 11 Screw 4 40x 437 PHP SS P w...

Page 116: ...S150 1 125 00035 00 DCP Nav Chassis GNC400 1 210 00043 00 Nut Special M4x0 7 1 211 00027 01 Screw Insert Extract w Flat 1 211 00037 00 Set Screw M3x0 5x2 6 2 211 60234 04 Screw 4 40x 125 PHP SS P w NY...

Page 117: ...L 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 4 410 00013 01 Rtry Pot w Mom Push Sw w hole 1 5 012 00258 00 PCB Assy GNC400 Interface Bd 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 00267 0...

Page 118: ...NYL 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 4 410 00013 01 Rtry Pot w Mom Push Sw w hole 1 5 012 00258 00 PCB Assy GNC400 Interface Bd 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 0026...

Page 119: ...L 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 4 410 00013 01 Rtry Pot w Mom Push Sw w hole 1 5 012 00258 00 PCB Assy GNC400 Interface Bd 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 00267 0...

Page 120: ...w NYL 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 4 410 00013 01 Rtry Pot w Mom Push Sw w hole 1 5 012 00258 00 PCB Assy GNC400 Interface Bd 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 002...

Page 121: ...NYL 2 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 2 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 6 Table 6 16 Sub Assy GNC 420 14 28V Black Unit P N 011 00506 10 Figure 7 5 Part Number Part Name Qty 01...

Page 122: ...P w NYL 2 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 6 253 00062 01 High Permb Shd 4 x6 Flat 1 253 00062 02 High Permb Shd 4 x2 25 Flat 1 Table 6 18 Sub Assy GNC 420A 28V Black Unit P N 011 00837 00...

Page 123: ...8 00 SMP Cover Top Main Chas GNC400 1 115 00246 00 SMP Hinge GNC400 Front 1 115 00246 01 SMP Hinge GNC400 Rear 1 145 00480 02 PMP Bezel Cover GNS430 1 161 00201 12 Lbl S N GNC420A Gray 1 161 00422 00...

Page 124: ...125 00034 01 Main Chs s w o Stud GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 1 211 60334 08 Screw 4 40x 250 PHP SS BO 3 211 63234 10 Scr 4 40...

Page 125: ...er Cvr GPS GNC500 1 125 00034 01 Main Chs s w o Stud GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 2 211 60234 11 Screw 4 40x 437 PHP SS P w NY...

Page 126: ...r Cvr GPS GNC500 1 125 00034 01 Main Chs s w o Stud GNC400 500 1 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 9 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 2 211 60234 11 Screw 4 40x 437 PHP SS P w NYL...

Page 127: ...31 10001 00 Cable Tie 4 0 2 250 00047 00 Insulator Comm Bd GNC400 1 250 00050 01 Insulator w Boss Main GNC400 1 250 00051 00 Insulator Inverter GNC400 1 253 00061 00 Seal EMI GNC400 500 1 253 00062 03...

Page 128: ...00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 00267 00 PMP Data Card Slots 1 12 211 14400 05 Screw TCM 1 7x5 0 FLHP...

Page 129: ...11 00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 00267 00 PMP Data Card Slots 1 12 211 14400 05 Screw TCM 1 7x5 0 FL...

Page 130: ...00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 00267 00 PMP Data Card Slots 1 12 211 14400 05 Screw TCM 1 7x5 0 FLHP...

Page 131: ...11 00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 9 440 00016 03 LCD Module DSTN Color W Lens 1 11 145 00267 00 PMP Data Card Slots 1 12 211 14400 05 Screw TCM 1 7x5 0 FL...

Page 132: ...211 60234 06 Screw 4 40x 187 PHP SS P w NYL 2 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 2 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 6 Table 6 30 Sub Assy GPS400 14 28V Gray Unit P N 011 00504 10...

Page 133: ...C400 1 334 00039 02 Header Bd to Bd 2x6 1 Table 6 32 Main Chassis Assy GPS 400 14 28V DO Unit P N 011 00283 33 Figure 7 9 Part Number Part Name Qty 011 00474 01 Sub Assy GPS Module GNC TSOII 1 012 002...

Page 134: ...45 00267 00 PMP Data Card Slots 1 12 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 5 13 125 00041 04 DCP Bezel Painted w Blk Trim 1 14 211 63232 08 Screw 2 56x 250 FLHP100 SS P 3 15 012 00257 00 PCB Assy GN...

Page 135: ...1 145 00267 00 PMP Data Card Slots 1 12 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 5 13 125 00041 05 DCP Bezel Painted Gray 1 14 211 63232 08 Screw 2 56x 250 FLHP100 SS P 3 15 012 00257 00 PCB Assy GNC40...

Page 136: ...assis Assembly GNS 430 A Dwg No 015 00283 00 Rev R x Figure 7 3 Nav Chassis Assembly GNC 400 Dwg No 015 00282 00 Rev K x Figure 7 4 GNC 4XX CDU Assembly Sheet 1 of 2 Dwg No 015 00281 XX Rev F x Figure...

Page 137: ...90 00140 05 GPS 400 x GPS 400 Assy Drawing Dwg No 015 00504 XX Rev G Figure 7 10 x Figure 7 9 Main Chassis Assembly GPS 400 Dwg No 015 00283 03 Rev J x GPS 400 Sub Assy Nav Chassis W O Nav Use Figure...

Page 138: ...400 SERIES MAINTENANCE MANUAL Page 7 3 page 7 4 blank P N 190 00140 05 Rev C Figure 7 1 Sub Assy GNS 430 Dwg No 015 00280 XX Rev P...

Page 139: ...400 SERIES MAINTENANCE MANUAL Page 7 5 page 7 6 blank P N 190 00140 05 Rev C Figure 7 2 Main Chassis Assy GNS 430 A Dwg No 015 00283 00 Rev R...

Page 140: ...400 SERIES MAINTENANCE MANUAL Page 7 7 page 7 8 blank P N 190 00140 05 Rev C Figure 7 3 Nav Chassis Assy GNC 400 Dwg No 015 00282 00 Rev K...

Page 141: ...400 SERIES MAINTENANCE MANUAL Page 7 9 Page 7 10 blank P N 190 00140 05 Rev C Figure 7 4 GNC 4XX CDU Assy Sheet 1 of 2 Dwg No 015 00281 XX Rev F...

Page 142: ...400 SERIES MAINTENANCE MANUAL Page 7 11 Page 7 12 blank P N 190 00140 05 Rev C Figure 7 4 GNC 4XX CDU Assy Sheet 2 of 2 Dwg No 015 00281 XX Rev F...

Page 143: ...400 SERIES MAINTENANCE MANUAL Page 7 13 page 7 14 blank P N 190 00140 05 Rev C Figure 7 5 Sub Assy GNC 420 Dwg No 015 00506 XX Rev N...

Page 144: ...400 SERIES MAINTENANCE MANUAL Page 7 15 page 7 16 blank P N 190 00140 05 Rev C Figure 7 6 Main Chassis Assy GNC 420 A Dwg No 015 00283 01 Rev K...

Page 145: ...400 SERIES MAINTENANCE MANUAL Page 7 17 page 7 18 blank P N 190 00140 05 Rev C Figure 7 7 Nav Chassis Assy W O Nav Dwg No 015 00282 01 Rev E...

Page 146: ...400 SERIES MAINTENANCE MANUAL Page 7 19 page 7 20 blank P N 190 00140 05 Rev C Figure 7 8 Sub Assy GNC 420A Dwg No 015 00837 XX Rev A...

Page 147: ...400 SERIES MAINTENANCE MANUAL Page 7 21 page 7 22 blank P N 190 00140 05 Rev C Figure 7 9 Main Chassis Assy GPS 400 Dwg No 015 00283 03 Rev J...

Page 148: ...400 SERIES MAINTENANCE MANUAL Page 7 23 Page 7 24 blank P N 190 00140 05 Rev C Figure 7 10 Assy Dwg GPS 400 Dwg No 015 00504 XX Rev G...

Page 149: ...ERSION UNIT PART NUMBERS GNC 420A UNIT P N COLOR OPERATING VOLTAGE MINIMUM XMIT PWR 011 00837 00 BLACK 28 V Only 16 W 011 00837 10 GRAY 28 V Only 16 W GNS 430A UNIT P N COLOR OPERATING VOLTAGE MINIMUM...

Page 150: ...erance V Max Current DC Conditions J2 Pins 11 12 27 5 r 4 3 0 A Transmit Mode A 4 DISASSEMBLY AND ASSEMBLY Disassemble the GNS 430A according to the procedures given in Section 4 A 5 ALIGNMENT CALIBRA...

Page 151: ...TORS Table B 2 Internal and External Connections Board Connector Designation Interface MAIN BOARD J1 Aircraft Mounting Rack J8 GPS Module J9 Nav and Glideslope J11 Com Board J12 LCD Flex J14 Data Base...

Page 152: ...L UNITS J15 RIGHT Data Card Flex MOMENTARY PUSH BD GNS 430 ONLY J15 LEFT Data Card Flex B 3 MAIN BOARD CONNECTORS B 3 1 J1 Table B 3 J1 Descriptions Pin Name Pin I O VLOC ANNUNCIATE 1 O GPS ANNUNCIATE...

Page 153: ...ROTOR C 31 O MAIN OBS ROTOR H Ground 32 O MAIN OBS STATOR D 33 I MAIN OBS STATOR E 2 5V Common OBS 34 O MAIN OBS STATOR F 35 I MAIN OBS STATOR G 2 5V Common OBS 36 O ALTITUDE ALARM AUDIO HI 37 O ALTI...

Page 154: ...C4 61 I ALTITUDE C2 62 I ALTITUDE C1 63 I ALTITUDE B4 64 I ALTITUDE B2 65 I ALTITUDE B1 66 I ALTITUDE A4 67 I ALTITUDE A2 68 I ALTITUDE A1 69 I ALTITUDE D4 70 I OBS MODE SELECT 71 I SPARE INPUT B 72...

Page 155: ...te with the processor on G S board NAV_VOL_CONTROL 9 O This is a dc output that is connected to the center tap of a pot See J14 41 POT_BOT_WPR VLOC_SERIAL_OUT 10 I Serial input used to communicate wit...

Page 156: ...ing edge of a CLK_ROW pulse FLM 8 O First Line Marker that pulses high for 33 236 us 30 088 kHz at period of 2 19359 ms 455 873 Hz The rising edge of FLM is about 1 1 us after the rising edge of a CLK...

Page 157: ...7 O NOT USED 58 O NOT USED 59 O LED_COMMON 60 O Led common is a 4 kHz PWM output that controls bezel key and nomenclature backlighting The longer this signal is low the brighter the LEDs will be B 3 6...

Page 158: ...ARD_CSR2N CARD_CSR1N CARD_CSR0N O Card chips select right 3 0 not Outputs pulses low typically for 200 or 260 depending on wait states when cards are accessed Only one should be low at a time 51 CARD_...

Page 159: ...E 8 10 54 RESETN 9 O Reset Not output Low when resetting D00 to D15 11 26 B1 Data I O A01 A13 27 39 O Address 01 13 output CMA14 CMA23 40 49 O Card and Map Address output Used for both addressing map...

Page 160: ...to an AC resistance of 10 Kohm The AC resistance mode is used to sample when the CCFT is on and is used to sample the current level The impedance level toggles at a rate of 71 13 Hz and the duty cycle...

Page 161: ...COM MIC KEY I 5 INTERCOM MIC HI I 6 COM MIC AUDIO HI I 7 500 COM AUDIO HI O 8 RESERVED I 9 RESERVED I 10 RESERVED I 11 AIRCRAFT POWER I 12 AIRCRAFT POWER I 13 RESERVED O 14 TRANSMIT INTERLOCK I 15 COM...

Page 162: ...of a 20K pot connected between 5V and Gnd 7 SPARE Spare 8 SPARE Spare 9 GND I Ground 10 GND I Ground B 5 NAV BOARD CONNECTORS B 5 1 J6 Table B 14 J6 Descriptions Pin Pin Name I O 1 VOR LOC TO O 2 VOR...

Page 163: ...R ILS 429 OUTB O 24 VOR ILS 429 OUTA O 25 VOR OBI CLOCK O 26 VOR OBI SYNC O 27 VOR OBI DATA O 28 VLOC REMOTE TRANSFER I 29 ILS ENERGIZE O 30 GLIDESLOPE FLAG O 31 GLIDESLOPE FLAG DOWN GLIDESLOPE COMMON...

Page 164: ...ezel 10 VLOC SERIAL OUT O This is a asynchronous serial output to the Main CPU board from the NAV Board B 5 3 J24 Table B 16 J24 Descriptions Pin Pin Name I O Description 1 12VDC O 2 5VDC O 3 GND O Gr...

Page 165: ...IAL_OUT O Serial output from G S Board to Main Board 9 G S FLAG O This output indicates whether course deviation is valid or not 10 G S UP O This is the vertical course deviation output for the G S 11...

Page 166: ...rce with a 1 k ohm in parallel 5 HEATER_ON I Heater On Input that when high enables the heater Heater is capacitor coupled 6 VCC I 7 GND I Ground 8 INVTR_ON I Inverter On input that when high enables...

Page 167: ...I O DESCRIPTION TRAP 1 I 0 to 12 V dc 4 Khz PWM output used to position the GPS notch RSSI 2 O Relative Signal Strength Indicator input used to position GPS notch via the TRAP output Input impedance...

Page 168: ...3 Signal used for both card chips only 1 should be low at a time and selecting map SPARE 8 10 54 RESETN 9 O Reset Not output Low when resetting D00 to D15 11 26 B1 Data I O A01 A13 27 39 O Address 01...

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Garmin GNC 420, Maintenance Manual

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