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Garmin GNC 420 GPS Receiver User Manual

1. R558 Li S o SC a Mies jel 3 O u T T 10 _ 0 oo 2 aCe at h Cmm 8 ll 8 12001 fo iga O cg gE smEss e LS ai UE 000 77 00 oh EU Erb nme Ta Il ca bo sei non hE I eti Oy Sole B 2 Ono 0 5 8 Mo Pp aU E EOS ca ea of oL ooo 000 s oO cau mun Er ge 8 a Joo 11 82 ca 00 MO 550 55 AS amr 1 2 1 5 15 OK Ds d K 3e gt s oo c Doi s 05 o mm oes m 3 GE 8 amp ue g O we 300 2 000 O 0 1 d ucg E r oo S _ a E oll i 128 oo r H est o Tis 10
2. 5 6 1 Com Setup Page Fields 56 1 1 Com Frequency uie 56 12 Frequency Spacia em 5 6 1 4 SQ 833 SAN 5 6 1 6 MIC Gain 5 7 TEST PROCEDURES uuu xu cate Sara uctor det edt 5 7 1 aaa usss 5 7 2 Com TESTING e a 5 75 27 Power Input Chek ee NEES 5 7 2 3 Frequency Stability and Tolerance 5 7 2 4 Modulation Capability 5 7 2 5 Carrier Noise Level eee e 5 7 2 6 Demodulated Audio Distortion 5 7 2 7 Demodulated Audio 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 SECTION 5 ALIGNMENT CALIBRATION AND TESTING continued 57 28 2 awe a 5 18 5 7 2 9 MIC Intercom Test sus ahh as 5 18 5 7 2 10 Receiver Sensitivity eae Sens RO eee 5 18 70 OU 5 19 5 7 2 12 estu u uuu 5 19 5 7 213 Selectivity 25 kHz Mode u
3. TABLE 1 MOD STATUS ECO REFERENCE gm 253 00062 02 NOT USED ON 011 00280 00 2 Pics 211 65254 10 di 2 PLCS 255 00062 01 NOT USED ON 011 00280 00 011 211 63254 10 4 PLCS VIEW NAV CHASSIS OMITTED FOR CLARITY 011 00281 0X 011 00460 40 Figure 7 1 Sub Assy GNS 430 Dwg 015 00280 Rev 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 3 page 7 4 blank Rev 115 00354 00 2 PLCS NOTE 2 DETAIL B a 1 80234 11 115 00205 00 012 00296 00 115 00203 00 211 60334 08 3 PLCS 211 60254 08 2 rics NOT USED ON 011 00283 00 211 60234 06 SEE DETAIL C 012 00547 3 211 60254 06 USED 012 00214 05 amp 012 00611 00 COMM BOARDS 250 00050 01 115 00207 00 NOTES 1 NOTE REMOVED 211 60254 06 2 APPLY A THIN COATING OF THERMAL JOINT COMPOUND 290 00001 00 925 02120 00 SOLDER POWER TRANSISTOR IN PLACE AFTER ALL MECHANICAL NOTE 3 ASSEMBLY OF BOARD AND TRANSISTOR IS COMPLETE 214 00023 00 USED ON 011 00285 00 3 AFTER SOLDERING TRIM LEAD ON FAR SIDE OF BOARD TO 035 MAX 2 PLCs ONLY 312 00005 00 2 PLCS SEE DETAIL D FOR 012 00214 05 COMM BOARDS 012 00214 OR 012 00611 00 211 60234 06 6 Pies 311 00003 05 NOTE 3
4. B 11 B 13 J26 D es rmpti niS a Ea B 12 Bet J6 Descriptions B 12 B 15 J10 Descriptions B 14 B 165 J24 DOSCFHDIIOFIS ote a a a naa a B 14 B 17 J 25 Des erpt nS as s avem WS Q B 15 B 18 J13 DescriptionS B 15 Bet J25 Descriptions s B 16 B 20 J27 DescriplioFis MET QM ER B 17 B 21 ino e Ra eee ees B 17 B 22 P16 Descriptions soci oe Re bed ene top b B 18 Page xii 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev C 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 LOC receivers and Glideslope receiver are present Table 1 1 Unit Configuration GPS 400 GNC 420 GNS 430 Main Processor GPS Receiver e VHF Com Transceiver VOR ILS Localizer Receivers
5. 12 00256 00 DETAIL C 250 00047 00 334 00039 01 250 00051 00 V 3530 00070 04 1 INCLUDES WASHER REAR OF UNIT 253 00062 05 334 00039 02 Q504 REF 211 63234 10 REAR OF UNIT 2 9 9 gt 670 00018 00 or 670 10002 0X p 825610 125 00034 01 DETAILED 5 PLCS ate testicle APPLIES 012 00214 05 NOTE 2 COMM BOARD ONLY 251 10001 00 310 00009 00 2 PLCS 4 519 5 TURNS 231 10001 00 3 TURNS 2 PLCS X REAR OF UNIT REAR OF UNIT VIEW VIEW DETAIL A DETAIL A ALL EXCEPT 011 00283 00 011 00283 00 ONLY Figure 7 2 Main Chassis Assy GNS 430 A Dwg No 015 00283 00 Rev R 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 5 page 7 6 blank Rev C 115 00214 00 115 00209 00 255 00055 01 REF FARSIDE SEE DETAIL C 211 60234 04 7 PLCS 012 00195 XX I 250 00048 00 211 60234 10 3 PLCS 012 00212 XX 571 00001 00 115 00321 00 125 00035 00 325 00063 01 1 60234 06 115 00215 00 115 00221 00 253 00053 02 SEE DETAIL B 250 00049 00 211 63234 10 2 PLCS 550 00070 05 2 PLCS 2 PLCS NO LOCKING COMPOUND SUPPLIED WITH 330 00070 03 211 00037 00 210 00045 00 212 20004 00 125 00035 00 211 00027 01 233 00009 00 125 00006 00 211 0003
6. 3 4 3 5 Processor Location Main Board 3 7 3 6 External Connector S u u uu usus 3 15 3 7 400 Series Block Diagram ta D 3 17 4 1 Nav Data Card Installation And 4 2 4 2 Memory Battery Location Main 4 7 5 1 40dB Attenuator Circuits re eee e Ua aE 5 3 5 2 Setup Pales Oe via tia ene b uqa tee acute epu ue 5 9 5537 vBB5S Comm Board a teret eer ecol 5 11 RUE 5 13 5 5 Modulation Measurement ob ehe ist 5 16 5 6 VOR LOC GS CDI Test Page iine tete nansaene 5 32 5 7 Main Lighting and Main Analog Test 5 44 5 8 GPS 5 45 5 9 Main CDI OBS Configuration Test 5 47 5 10 Main Discrete Outputs Test Page r 5 49 5 11 Main Discrete Inputs Test 5 51 5 12 Main Status Loopback Test Page 5 52 5 13 Main CDI OBS Configuration Page 5 54 7 1 Sub Assembly GNS 430 Dwg No 015 00280 XX Rev P 7 3 7 2 Main Chassis Assembly GNS 430 Dwg No 015 00283 00 Rev Q
7. a 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 17 Rev C Table 6 19 Sub Assy GNC 420A 28V Gray Unit P N 011 00837 10 Figure 7 8 Page 6 18 Rev C Part Number Part Name Qty 011 00281 05 Sub Assy CDU GNC420 Gray 011 00282 01 Sub Assy Nav Chassis w o Nav 011 00283 21 Sub Main Chassis GNC420A 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 12 Lbl S N GNC420A Gray 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat oD NO INI INI N 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 20 Main Chassis Assy GNC 420 28V Unit P N 011 00283 01 Figure 7 6 Part Number Part Name Qty 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00214 03 PCB Assy Comm 2 5ppm TCXO 012 00256 00 PCB Assy G
8. 3 10 3 7 Testing Failures COM Board 3 12 3 8 Testing Failures NAV Board on 3 13 3 9 Testing Failures Glideslope 3 13 3 10 Testing Failures NAV Receiver L 3 14 5 1 Channel ID And Frequency accetti 5 14 6 1 Sub Assy GNS 430 28V Black Unit P N 011 00280 00 Figure 7 1 6 4 6 2 Sub Assy GNS 430 14 28V Black Unit P N 011 00280 10 Figure 7 1 6 4 6 3 Sub Assy GNS 430 14 28V Gray Unit P N 011 00280 30 Figure 7 1 6 5 6 4 Sub Assy GNS 430A 28V Black Unit P N 011 00836 00 Figure 7 1 6 5 6 5 Sub Assy GNS 430A 28V Gray Unit P N 011 00836 10 Figure 7 1 6 6 6 6 Main Chassis Assy GNS 430 14 28V Unit P N 011 00283 10 Figure 7 2 6 7 6 7 Main Chassis GNS 430 14 28V Unit P N 011 00283 30 Fig 7 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 00282 00 Figure 7 3 6 11 6 11 Sub Assy CDU GNS 430 Black Unit P N 011 00281 00 Figure 7 4 6 12 6 12 Sub Assy CDU GNS 430 Gray Unit P N 011 00281 04 Figure 7 4 6 13 6 13 Sub
9. Figure 4 2 Memory Battery Location Main Board 4 7 1 Remove the Memory Battery 400 SERIES MAINTENANCE MANUAL Page 4 7 P N 190 00140 05 Rev C 1 Remove the Main Board paragraph 4 5 5 2 Remove all electrical grounds from the unit so if using a grounded tip soldering iron the battery will not be shorted upon removal 3 Unsolder the battery leads from the bottom side of the Main Board 4 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 the bottom side of the Main Board 6 Reinstall the Main Board 7 Turn the unit on 8 Verify the Memory Battery Low message does not appear 9 Turn the unit off and carefully turn the unit over 10 Verify the memory battery voltage measure from positive side of the battery to ground is at least 2 9 VDC OK Page 4 8 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 SECTION 5 ALIGNMENT CALIBRATION AND TESTING 5 1 INTRODUCTION This section provides unit level alignment calibration and testing information for the 400 Series units The procedures in this section can be performed before troubleshooting begins to help identify a faulty board or as a return to service test after repair has been completed All tests can be performed without accessing the inside of the unit A CAUTION ELECTROSTATIC S
10. 5 51 5 7 6 23 ARINC 429 Transmitters and Receivers 5 52 5 7 0 24 Moose ep 5 53 5 70 29 OBS RAC Reet ner a Ca d dde bu tus Re c 5 54 SECTION 6 PARTS AND ASSEMBLIES Paragraph Page 6 1 INTRODUCTION u u 6 1 ES aD 6 1 SECTION 7 ASSEMBLY DRAWINGS fa INTRODUCTION S u peni Eae 7 1 Q aS at 7 1 Page viii 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev C APPENDIX A GNC 420A AND GNS 430A Ad DESGRIPTION cocci A2 A VERSION PART NUMBERS cette eee eerte AS TROUBLESHOOTING A 4 DISASSEMBLY AND A 5 ALIGNMENT CALIBRATION AND TESTING A 6 REPLACEABLE PARTS AND ASSEMBLIES A 7 ASSEMBLY DBRAWINOG ei et xe n ees APPENDIX B CONNECTOR DESCRIPTIONS Bet SDONDESGBIPTEON Sites B 2 INTERNAL AND EXTERNAL CONNECTORS MAIN BOARD 5 B 4 BOARD
11. B 5 NAV BOARD CONNECTORS ince GLIDESLOPE BOARD 5 B 7 KEYBOARD CONNECTORS ei aa dei INVERTER BOARD CONNECTORS B 9 GPS MODULE CONNECTORS vinci ete tete edades B 10 INTERFACE BOARD B 11 DISPLAY MODULE CONNECTORS ite epit ORE Renten 12 DATA BASE CARD B 13 MAPBOARD GONNEGTORS 5 triente ie Ree tee epa 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page ix Rev C LIST OF FIGURES Figure Page 2 NUM te oh Se g 2 1 2 2 Signal And Load Drawing J1 Sheet 1 of 2 2 3 2 5 Signal And Load Drawing J1 Sheet 2 of 2 2 5 2 4 Signal And Load Drawing J2 e ERR ak esL dn RR 2 7 2 5 Signal And 2 9 3 1 Main Board Fuse Locations Pede 9 2 3 2 Com Board Fuse Location F600 eae 3 3 3 3 Com Board Fuse Location F600 Replaced by R611 3 3 3 4 Nav Board Fuse Locations
12. 96 00000 0010 00 Figure 3 4 Board Fuse Locations 3 3 2 Power Supply Checks 3 3 2 1 Current Measurements Taking intra board and external current measurements is one way of determining a faulty board To measure the currents use a spare ribbon 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 troubleshooting the intra board currents are given as reference e Com Board Tables 3 2 and 3 3 J26 Intra board Main Board to Com Board J2 External Connector Glideslope Board Table 3 4 125 Intra board Nav Board to Glideslope Board e Nav Board Table 3 4 J10 Intra board Main Board to Nav Board J6 External Connector Page 3 4 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 The values listed in Table 3 1 are with the display backlight at maximum brightness Table 3 1 Unit Board Power Supply Max Current Allowed Unit Main Board Unit Max Current A Max Current A Status 27 5 V 13 8 V Optional GNC 420 ON RX 0 99 RX 1 98 TX 3 36 TX 7 32 GNS 430 ON RX 1 17 RX 2 34 TX 3 98 TX 7 96 FF ALL UNITS 0 014 0 011 16 Watt Units Unit Status Max Current A 27 5 V GNC 420A ON RX 0 99 TX 3 36 GNS 430A ON RX 1 17 TX 3 98 3 3 2 2 Com Board Replace the M
13. d AN 874 m Abt NA oo B k Old 0 S Ol 0 ent i 00000000 00000000 00000000 pr 00000006 00000000 00000000 88 0000000 00000000 Lnd E 0 a l 0000000 00000000 5 sooo Too 2 B lie 8 E 5 E D s uu SS Djs L El 414 22 DL a 05 i 0 a n n as 0000 5 BO 5 0900000000 00 Sire s oss D do oc a o E 1 E a assai he E C3 nn 5 A 2 O O9 WW r O_O n 002200 0052005 1 2 E nnn 5 52 H m0 Q 0g E Ono o PM e 0000200 00500 me A 0 D oo O af 3 s 1 000700 000200 i Coo a 4 ooOoo Figure 3 5 Processor Location Main Board 3 4 STATIC MESSAGES The unit informs the user of operational 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 actions in the order listed If the unit fails any of the power up integrity checks a Fatal Error Page will be displayed Replace the Main Board if this message is displayed 400 SERIES MAINTENANCE MANUAL Page 3 7 P N 190 00140 05 Rev C Tabl
14. 7 5 7 3 Nav Chassis Assembly GNC 400 Dwg No 015 00282 00 Rev K 7 7 7 4 GNC 4XX CDU Assembly Sheet 1 of 2 Dwg No 015 00281 Rev 7 9 7 4 GNC 4XX CDU Assembly Sheet 2 of 2 Dwg No 015 00281 XX Rev 7 11 7 5 Sub Assembly GNC 420 Dwg 015 00506 XX Rev N 7 13 7 6 Main Chassis Assembly GNC 420 Dwg 015 00283 01 Rev J 7 15 7 7 Sub Assy GNC 420 Nav Chas W O Nav Dwg 015 00282 01 Rev E 7 17 7 8 Sub Assy GNC 420A Dwg 015 00837 Rev A 7 19 7 9 Main Chassis Assembly GPS 400 Dwg No 015 00283 03 Rev J 7 21 7 10 Assy Dwg GPS 400 Dwg 015 00504 XX Rev G 7 23 Page x 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev C LIST OF TABLES Table Page Tet Unit os u kus thle dads 1 1 3 1 Unit Board Power Supply Max Current Allowed 3 5 3 2 Board Power Supply Tolerances 3 5 3 3 Glideslope Board Power Supply Tolerances 3 6 3 4 Nav Board Power Supply Tolerances 3 6 3 5 Static MESSAGES Maayan kiasa asas 3 8 3 6 Testing Failures Main Board
15. C C C j 0 I I I I E NAV BOARD CONNECTORS J6 Table B 14 J6 Descriptions io VOR LOC RIGHT COMMON VOR LOC IF AGC VOR OBS ROTOR C 8 VOR LOCCOMPOSITE OUT VOR OBS ROTOR H GND Page B 12 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Table B 14 J6 Descriptions continued 500 VOR ILS AUDIO HI 500 VOR ILS AUDIO LO GND SERIAL DME CLOCK SERIAL DME DATA SER DME CHAN REQ DME 4MHZ SER DME RNAV MODE PAR DME 2MHZ VOR ILS DME COMMON VOR ILS 429 OUTB VOR ILS 429 OUTA VOR OBI CLOCK VOR OBI SYNC VOR OBI DATA VLOC REMOTE TRANSFER ILS ENERGIZE GLIDESLOPE FLAG GLIDESLOPE FLAG DOWN GLIDESLOPE COMMON IO IO PARALLEL DME IMHZ GLIDESLOPE IF AGC VOR ILS 429 INB VOR ILS 429 INA PARALLEL DME 800KHZ GLIDESLOPE SUPER FLAG OUT PARALLEL DME 400KHZ PARALLEL DME 200K HZ AIRCRAFT GROUND PARALLEL DME 100K HZ PARALLEL DME 50KHZ AIRCRAFT POWER 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page B 13 Rev C B 5 2 J10 Table B 15 J10 Descriptions a 2 3 C ES S s x _ 2 G S SERIAL OUT This is an asynchronous serial output from the G S board to the Main CPU board NAV VOL I This is a dc input in the range between 0 and 5 volts coming through the CONTROL Main CPU board from the NAV volume control pot mounted on t
16. ILS Glideslope Receiver 1 1 1 Versions Covered by this Manual This manual applies to the GPS 400 GNC 420 and the GNS 430 It also applies to the GNC 420A and the GNS 430A The A identifies the 16 watt VHF COM transmitter as opposed to the 10 watt version Appendix A describes the GNC 420A and the GNS 430A For ease of identification the following tables contain part number information relative to the different versions of the 400 Series 400 SERIES MAINTENANCE MANUAL Page 1 1 P N 190 00140 05 Rev C 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 10W 011 00506 30 GRAY 14 or 28 V 10W GNS 430 UNIT P N COLOR OPERATING MINIMUM VOLTAGE XMIT PWR 011 00280 00 BLACK 28 V 10 W 011 00280 10 BLACK 140 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 16W 011 00837 10 GRAY 28 V only 16W GNS 430A UNIT P N COLOR OPERATING MINIMUM VOLTAGE XMIT PWR 011 00836 00 BLACK 28 V only 16 W 011 00836 10 GRAY 28 V only 16 W Page 1 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Each of the configurations includes a color display providing graphic
17. oe Ge qe ton 3 6 3 3 3 1 Internal Clock Check Main 55 3 6 3 3 3 2 Internal Clock Check QGPS Processor cccccccccccsccesececeeeseeeeeeeseeeseeeseeeseeeeeess 3 6 3 4 STATIC MESSAGES bu Susu doeet ee ttc ettet ces 3 7 3 5 TESTING 3 10 3 6 EXTERNAL 3 15 3 7 CONNECTOR 3 15 3 8 BEOCK DIAGRAM o Tama 3 15 SECTION 4 DISASSEMBLY AND ASSEMBLY Paragraph Page 1 INTRODUCTIONS Y U 4 1 4 2 REQUIRED TOOLS u y 4 1 4 3 NAV DATA CARD REMOVAL AND 4 2 44 UNIT DESIGN 4 3 4 5 DISASSEMBLY PROCEDURE 4 3 4 51 Remove the Top Cover ser ento 4 3 4 5 2 Remove the CDU Assembly 4 3 4 5 2 1 Disassemble the CDU Assembly 0 4 4 4 5 3 Separate the Main and Nav 4 4 4 5 4 Remove Faulty Boards from the Main Chassis Top Cavity 4 5 4 5 5 Remove Faulty Boards from the Main Chassis Underside Cavity 4 5 4 5 6 Remove Faulty Board
18. 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 Gray Unit P N 011 00504 10 Figure 7 1 6 27 6 31 Main Chassis Assy GPS 400 14 28V Unit P N 011 00283 03 Figure 7 9 6 28 6 32 Main Chassis Assy GPS 400 14 28V DO Unit P N 011 00283 33 Fig 7 9 6 28 6 33 Nav Chassis Sub Assy GPS 400 Unit P N 01 1 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 Unit Main Board Power Supply Maximum Current A 1 2 Voltage and Current Supply A 2 B 1 cedes ee n B 1 B 2 Internal and External Connectors 24 40 0 B 1 Bisse JT Descriptions tente certas B 2 B Je DescripliOHis a S 4 B 5 J9 DESCriPLONS E B 5 B 65 JT IBescriplioris u u alta B 5 B 7 5712 Descriptions oe tiene eder 6 ccc B 7 B 9 J16 Descriptions B 9 10 J17 Descriptions B 10 Bett PT3 DeSCHpUOFIS u u u cos eo eoa pe B 10 B 12 J2 DOSCM PHONG un hale Pattie
19. C LO LO 0 COMM IF AGC TEST SQUELCH COMPRESSOR TEST COMM AUDIO IN NOT USED NOT USED HI SPARE NOT USED COMM ANTENNA J2 11 12 21 22 Ui 16 20 23 24 18 AWG 10 AMP CIRCUIT BREAKER POWER SUPPLY FOR 14 28V RADIO 18 AWG 18 WG 28 VDC 3 AMP POWER SUPPLY 18 AWG i 500 0HM HP 331A DISTORTION ANALYZER T ADAP IHC MOMENTARY SWITCH 7 PTT LINE TER 200 MHz OSCILLOSCOPE AUDIO OSCILLATOR ol lt O al COMM IH RANSFER SWITCH IMPEDANCE IR Jh TX POWER METER 5 NOT USED 50W LOAD OW 6 dB RX MARCONI 2030 SIGNAL GENERATOR 10 K VOLTMETER Figure 2 4 J2 Signal and Load Drawing 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 2 7 Page 2 8 blank Rev S0 0F 100 061 TVONVW SONVNS LNIVIA 007 ueq 01 9504 6 2874 peo pue 9f 6 2 GNS 430 NAV LEFT NAV RIGHT NAV TO NAV FROM NAV FLAG NAV FLAG NAV SUPERFLAG NAV COMPOSITE OUT NAV ILS ENERGIZE G S UP G S DOWN FLAG G S FLAG G S SUPERFLAG VOR OBS ROTOR H VOR OBS
20. AND G S BOARD 012 00212 MOUNT PC BOARD 012 00195 4 USING 44 40 SCREWS 211 60204 04 FROM TOP AND 2 44 40 211 63204 10 THRU BACK OF CHASSIS INTO PCB REAR CONNECTOR MOUNT PC BOARD 012 00212 USING 3 4 40 SCREWS 211 60204 04 SOLDER CENTER PIN COAXIAL CONNECTORS 330 00070 03 PC BOARDS AS REQUIRED PRESS amp MOUNT COVER 115 00221 00 TO SHIELDING USING 4 40 SCREW 211 60204 06 PRESS COVERS 115 00209 00 amp 115 00215 00 ON SHIELDING AS SHOWN PRESS RIBBON CONNECTOR 325 00063 00 INTO MATING CONNECTORS ON PCB ASSEMBLIES PRESS COVER 115 00214 00 OVER NAV ASSEMBLY INSTALL FAN 371 00001 00 WITH SHIELD 115 00321 00 FROM TOP USING 3 44 40 SCREWS 211 60204 10 LOCATE LABEL ON FAN FACING CHASSIS AND POSTION AS SHOWN Figure 7 3 Nav Chassis Assy GNC 400 Dwg No 015 00282 00 Rev K 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 7 page 7 8 blank Rev NOTES 1 APPLY THREAD LOCKING COMPOUND 942 TO THREADED NUTS FOR ALL SWITCHES 1 3 4 amp 32 AND SET SCREWS 7 AND 30 8 FLEXES 25 amp 96 SHOWN ON SHEET 2 3 APPLY SNAPDOME ARRAY 23 gt NOT SHOWN TO 1525 4 SUME PARTS NOT USED ON SOME ASSEMBLIES SEE BOM 011 00281 FOR CONTROLING PARTS LIST 5 GPS400 ONLY CUT FLEX BETWEEN SHOWN CUT LINES AND COVER EXPOSED COPPER EDGE WITH KAPTON TAPE 352 AS REQUIRED 6 GNC420 AND GNV410 AND GPS400 ONLY COVER UNUSED SWITCH
21. Figure 5 3 R558 Com Board 400 SERIES MAINTENANCE MANUAL Page 5 11 P N 190 00140 05 Rev C 5 7 TEST PROCEDURES 5 7 1 Test Mode In order to perform certain tests in the following section the GNS 430 must be put into test mode which allows access to the Test Pages Figure 5 4 To put the unit in the test mode ground Test Pin J1 76 and turn the unit on When in test mode 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 manual Follow these steps to change data on a Test Page 1 Press the small right knob labeled CRSR to turn the cursor on 2 Turn the large right knob to change data between data fields 3 Turn the large or small right knob to change a field that the cursor is on 4 Once you have made the desired selection press the ENT key to accept the entry Page 5 12 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 HAIN STATUS 7 LOOPBACK VOR DISCRETE OUTP
22. 26 012 00271 00 PCB Assy Flex Ckt Pot GNC400 27 335 00044 10 Strip 2mm RA 4x10 28 430 00013 01 Knob Assy Outer GNC400 500 33 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 34 212 00021 00 Wshr Special GPS400 36 115 00341 00 SMP Cover GPS400 37 253 00068 00 Gasket Foam Adh Backed la 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 29 Rev C Table 6 35 Sub Assembly CDU GPS 400 Gray Unit P N 011 00281 06 Fig 7 4 Page 6 30 Rev C UJ c o Part Number Part Name lt 011 00340 00 Sub Assy Inc Dec Push Switch 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 410 00012 01 Rtry Sw Pot w Mom Push Sw 012 00258 00 PCB Assy GNC400 Interface Bd 210 00021 00 Nut Hex Reduced 211 00030 00 Pivot Pin Power Switch 117 00028 00 Shaft Pot Machined GNC4XX 440 00016 03 LCD Module DSTN Color W Lens 145 00267 00 PMP Data Card Slots 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 125 00041 05 DCP Bezel Painted Gray 211 63232 08 Screw 2 56x 250 FLHP100 SS P 012 00257 00 PCB Assy GNC400 Keyboard 414 00034 13 CDU Front Panel GPS400 Gray oluao nioinmozcnoj o ojojo m 430 00020 00 Knob Vol w Dot 22 430 0001 9 02 Knob Inner w PUSH 23 340 00035 00 Array GNC4XX 2
23. MESSAGE ANNUNCIATE WAYPOINT ANNUNCIATE CDI SOURCE SELECT VLOC ANNUNCIATE GPS ANNUNCIATE OBS MODE SELECT AUTO ANNUNCIATE OBS ANNUNCIATE TERMINAL ANNUNCIATE APPROACH ANNUNCIATE ILS GPS APPROACH TIME MARK OUT DEMO MODE SELECT GPS RS 232 OUT 1 GPS RS 232 IN 1 GPS RS 232 OUT 3 GPS RS 232 IN 3 SPARE INPUT A TEST MODE SELECT GPS ANTENNA 32 ofp PTS 18 1 31 gt E 33 g BFGOODRICH PRESICION TRACK 34 SELECTOR 35 K D 36 C 6 gt 3 i gt ES 13 o i gt 7 2 i gt a 71 8 i gt 7 i gt RESISTORS CONNECT TO EXTERNAL VOLTAGE SOURCE SUCH THAT IT WILL SOURCE L gt 275 mA WHEN GROUNDED 28V 100 OHMS 8W 5 gt 14 51 OHMS 4W i gt 16 gt ac i 4 1K ACTIVE LOW INPUT 56 gt 57 LOOPBACK RX TX PAIR 44 gt 42 72 DUAL POWER SWITCH TL 76 ACTIVE LOW INPUT J3 gt GA 56 WITH 10dB LOSS CABLE Figure 2 3 J1 Signal and Load Drawing Sheet 2 of 2 400 SERIES MAINTENANCE MANUAL P N 190 00140 Page 2 5 Page 2 6 blank Rev GNC 420 GNS 430 AIRCRAFT POWER AIRCRAFT POWER AIRCRAFT GROUND AIRCRAFT GROUND 500 OHM COM AUDIO HIGH 500 OHM COM AUDIO COM MIC K INTERCOM MIC COM MIC AUDIO COM MIC AUDIO INTERCOM MIC TRANSMIT INTERLO COMM REMOTE TRANSF NOT US NOT US NOT US NOT US NOT USE
24. P12 122 DISPLAY MODULE ume J1 MESSAGE DRIVERS REAL TIME CLK a RS232 TRANSCEIVER RAM ARINC 429 ADDR LATCHES re DISCRETE 1 0 CPU amp 126 J27 z J9 J16 P13 13 INVERTER BOARD INTERFACE BOARD DATA CARD FLEX 120 LEFT DATA BASE a Jib P14 P19 J19 lt gt CARD in J10 16 121 lt P gt RICHT DATA Base S gt s a MAP BOARD VOR LOC 2 GNS 430 ONLY m 2 lt gt ees LEFT ROTARY GNC 420 AND GNS 430 ee 12 8 55 J15 L MOMENTARY PUSH BD GNs 430 ONLY Eum 1 ES ens EOT ENEE 1 5 pe m NAV VOL POT GNS 430 ONLY a jua f AR 1 1101 COM VOL ca 420 AND GNS 430 i GPS RECEIVER a Figure 3 7 400 Series Block Diagarm 400 SERIES MAINTENANCE MANUAL Page 3 17 Page 3 18 blank P N 190 00140 05 Rev SECTION 4 DISASSEMBLY AND ASSEMBLY 4 1 INTRODUCTION Repairing the unit is accomplished by removing and replacing defective boards To help disassemble and reassemble the unit in order to access the boards look at the assembly drawings in Section 7 and the parts lists in Section 6 CAUTION ELECTROSTATIC SENS T VE Each unit in the 400 Series contains static sensitive components Observe proper anti static procedures when testing the unit Do not replace assemblies with the unit turned o
25. ie 79 2 UJ gt lt Q z O K lt D UJ a Q z O e ol 9 lt Table 6 33 Nav Chassis Sub Assy GPS 400 Unit P N 011 00282 01 Figure 7 7 The GPS 400 Nav Chassis Assy is the same as the GNC 420 420A Nav Chassis Sub Assy Parts List Table 6 24 Page 6 28 Rev C 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 34 Sub Assembly CDU GPS 400 Black Unit P N 011 00281 03 Fig 7 4 UJ c o Part Number Part Name lt 011 00340 00 Sub Assy Inc Dec Push Switch 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 410 00012 01 Rtry Sw Pot w Mom Push Sw 012 00258 00 PCB Assy GNC400 Interface Bd 210 00021 00 Nut Hex Reduced 211 00030 00 Pivot Pin Power Switch 117 00028 00 Shaft Pot Machined GNC4XX 440 00016 03 LCD Module DSTN Color W Lens 145 00267 00 PMP Data Card Slots 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 125 00041 04 DCP Bezel Painted w BIk Trim 211 63232 08 Screw 2 56x 250 FLHP100 SS P 012 00257 00 PCB Assy GNC400 Keyboard 414 00034 03 CDU Front Panel GPS400 Black 430 00020 00 Knob Vol w Dot 22 430 00019 02 Knob Inner w PUSH 23 340 00035 00 Snapdome Array GNC4XX 25 012 00270 00 Assy Flex Ckt Dsply Kybd
26. nn B 7 KEYBOARD CONNECTORS 7 1 J23 See description of LCD Flex J12 400 SERIES MAINTENANCE MANUAL Page B 15 P N 190 00140 05 Rev C B 8 INVERTER BOARD CONNECTORS B 8 1 J13 Table B 18 J13 Description 11 to 14 V dc Cold Cathode Transmit A Not input Occurs at 58 5 kHz and is active low Inverter is capacitor coupled CCFT TB_NOT CCFT CURRENT HEATER ON _TB_ Cold Cathode Transmit B Not input Occurs at 58 5 kHz and is active low Inverter is capacitor coupled INVTR_ON Cold Cathode Fluorescent Tube Current is an output used to measure the amount of current leaving the tubes Output is a half wave rectified wave form of a 58 5 kHz current source with a 1 k ohm in parallel I Heater On Input that when high enables the heater Heater is capacitor coupled EC AN gt Inverter On input that when high enables the inverter fly back supply Invertor on if Vin gt 4 5 V and Invertor off if Vin lt 0 4 V Inverter Voltage control analog input Valid ranges from 0 to 5 volts Inverter Power provides fused power to the inverter flyback Heater power provides fused power to the heater INV V CTRL PWR INVTR PWR HTR Table B 19 J26 Description Description gt Bul cathode a kl I Bulb cathode May not be used if single bulb 463 00003 00 is used Bulb cathode May not be used if single bulb 463 00003 00 is used Bulb cathode ot used ot used N
27. uns 5 34 5 7 4 9 Nav Serial DME Oulputs codes pia acne 5 35 5 7 4 10 NAV Parallel DME Outputs 5 35 5 7 5 lideslope Final Teste coe hte tet Banned 5 37 5 7 5 1 Glideslope Course Deviation Output Characteristic 5 97 5 7 5 2 Course Deviation Deflection Accuracy 5 37 5 7 5 3 Course Deviation Flag 5 37 5 7 5 4 Glideslope Superflag Output 5 38 5 7 5 5 R ceiver Sensitivity cordoba RAE 5 38 5 7 9 6 Centering ob etie o E u una es 5 39 we marco ve 5 39 5 7 5 8 Selectivity Bandwidlh a 5 39 5 7 9 9 Nose Bangwidth det 5 40 5 7 5 10 Skirt Bandwidth e 5 40 5 7 5 11 SPURlOWS RESPONSE oe uu I eat 5 40 5 7 5 12 Status 5 41 5 7 6 Main Board Final Tests eee 5 42 5 7 6 1 Push Button Response vac 5 42 95D MODS Banh 5 42 5 7 6 3 Map ID and Data Card 5 42 5 43 5 7
28. 4 MOUNTING PADS BOTH SIDES WITH KAPTON AS REQUIRED SECURE EXCESS LOOP OF FLEX CONNECTOR AS ART OF SWITCH 410 00011 00 Figure 7 4 GNC 4XX CDU Assy Sheet 1 of 2 Dwg No 015 00281 Rev 400 SERIES MAINTENANCE MANUAL Page 7 9 Page 7 10 blank P N 190 00140 05 Rev 5 SEE NOTE 6 SEE NOTE 5 Figure 7 4 GNC 4XX CDU Assy Sheet 2 of 2 Dwg No 015 00281 XX Rev F 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 11 Page 7 12 blank Rev 211 00052 00 2 PLCS 2 SQ 9 011 00283 XX aN 115 00246 01 MN ge V 211 00054 00 2 PLCS 211 80237 10 2 PLCS 011 00282 01 BOTTOM VIEW Y 161 00201 XX STI SEE NOTE 2 NOTES 1 ALL THREADED FASTENERS SHALL HAVE THREAD LOCKING COMPOUND 291 00025 02 UNLESS OTHERWISE NOTED OR PRE APPLIED 2 FOR UNITS WITH MODS INSTALLED PER TABLE 1 INSURE THAT APPLICABLE MOD STATUS NUMBER HAS BEEN PERMANENTLY MARKED OUT ON UNIT SERIAL TAG 161 00201 XX ASSY NO MOD ECO 011 00506 00 1 11799 011 00506 10 1 14451 011 00506 10 2 14889 011 00506 10 3 17516 011 00506 30 3 17516 01
29. COMPOUND REQ D 211 63234 1 2 PLCS 510 00009 00 231 10001 00 310 00009 00 3 TURNS 2 PLCS 3 TURNS 2 PLCS A A DETAIL A 011 00283 11 ONLY REAR OF UNIT 231 10001 00 t REAR OF UNIT VIEW 011 00283 01 ONLY 312 00005 00 SEE DETAIL D FOR 011 00283 10 ONLY 311 00003 05 012 00214 OR 012 00611 00 NOTE t 211 60234 06 6 PLCS DETAIL 012 00256 00 250 00051 00 REAR OF UNIT 253 00062 03 0504 REF REAR OF UNIT 9 670 00018 00 or 670 10002 0 DETAIL D DETAIL 125 00034 01 REF poene d 012 00214 05 COMM NOTE 2 BOARD ONLY Figure 7 6 Main Chassis Assy GNC 420 A Dwg No 015 00283 01 Rev K 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 15 page 7 16 blank Rev C 211 00037 00 210 00043 00 212 20004 00 125 00035 00 REF 211 00027 01 125 00006 00 233 00009 00 211 00037 00 DETAIL 211 60234 10 115 00337 00 211 63234 10 115 00321 00 2 PLCS ASSEMBLY NOTES 1 ALL THEADED FASTENERS SHALI L HAVE THREAD LOCKING COMPOUND 291 00025 02 UNLESS OTHERWISE NOTED OR PRE APPLIED 231 00020 00 2 PLCS 2 INSTALL PAWL 125 00006 00 INTO CHASSIS 125 00035 00 BY INSERTING INSERT EXTRACT SCREW 211 00027 01 THRU HOLE IN CHASSIS AS SHOWN IN DETAIL
30. 1 Apply an input level from the RF generator of 79 dBm 2 Modulate a standard VOR audio test signal at 350 Hz 1000 Hz and 2500 Hz must be in IDENT mode to pass 1000 Hz tone 3 Measure 500 VOR ILS AUDIO HI J6 16 with respect to 500 VOR ILS AUDIO LO 16 17 4 Verify the combined distortion and noise in the receiver VOICE IDENT audio output is not greater than 10 at all levels up to 100 mW 7 07 RMS or 20Vpp Distortion NGT 10 5 7 3 4 VOR AGC 1 Apply a standard VOR audio test signal between the limits of 99 dBm and 13 dBm 2 Measure 500 Q VOR ILS AUDIO HI J6 16 with respect to 500 Q VOR ILS AUDIO LO GND J6 17 must be in IDENT mode to pass 1000 Hz tone set to 7 07 Vrms 3 Verify the difference between the maximum and the minimum VOICE IDENT audio output levels is not greater than 3 dB Maximum and Minimum Output Level NGT 3 dB 5 7 3 5 VOR Audio Sensitivity 1 Place unit in IDENT mode 2 Apply a 103 5 dBm RF level to the RF input 3 Apply a Standard VOR Audio Test signal at RF frequencies of 108 00 MHz 112 50 MHz 112 55 and 117 95 MHz 4 Measure at the 500 VOR ILS AUDIO HI 16 16 and 500 VOR ILS AUDIO LO 16 17 outputs set to 7 07 Vrms 5 Verify the Audio SINAD or SNR is greater than 6 dB Audio SINAD gt 6 dB Page 5 26 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 3 6 Receiver Quieting 1 Apply a 86 dBm RF level to the RF input 2 Apply a Standard VOR Audio
31. 11 145 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 GNC400 Keyboard 1 17 414 00034 11 CDU Front Panel GNC420 Gray 1 18 430 00020 01 Knob Vol w C and Dot 1 21 430 00019 00 Knob Inner w o Decoration 1 22 430 00019 02 Knob Inner w PUSH 1 23 340 00035 00 Snapdome Array GNCAXX 1 25 012 00270 00 Assy Flex Ckt Dsply Kybd 1 26 012 00271 00 Assy Flex Ckt Pot GNC400 1 27 335 00044 10 Skt Strip 2mm RA 4x10 1 37 253 00068 00 Gasket Foam Adh Backed 1 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 6 2 4 GPS 400 Tables Part Number Part Name lt 011 00281 03 Sub Assy CDU GPS400 011 00282 01 Sub Assy Nav Chassis w o Nav 011 00283 33 Sub Main Chassis GPS400 DO 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 03 PMP Bezel Cover GPS400 161 00201 01 LbI S N GPS400 161 00422 00 Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP
32. 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 Characteristic Test Verify the TO FROM VOR LOC TO output is capable of driving up to three meter loads of 200 ohms each 5 7 4 3 To From Deflection Accuracy Test 1 Display TO 2 Measure VOR LOC TO J6 1 with respect to VOR LOC FROM J6 2 3 Verify the following output TO FROM VOR LOC 225 75 mV 4 Display FROM 5 Measure VOR LOC TO J6 1 with respect to VOR LOC FROM J6 2 Page 5 32 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 6 Verify the following output TO FROM VOR LOC 225 75 mV 7 Display HIDE 8 Measure VOR LOC TO J6 1 with respect to VOR LOC FROM J6 2 9 Verify the following output TO FROM VOR LOC TO mV 0 mV 45 mV 5 7 4 4 Course Deviation Flag Output Characteristic Test Verify the Course Deviation Flag VOR LOC FLAG output is capable of driving up to three meter loads of 1000 ohms each 5 7 4 5 Course Deviation Flag Test 1 Display Flag HIDE 2 Measure VOR LOC FLAG J6 3 with respect to VOR LOC FLAG 16 4 3 Verify the following output VOR LOC FLAG _ 375 80 mV 4 Display Flag IN VIEW 5 Measure VOR LOC FLAG J6 3 with respect to VOR LOC FLAG J6 4 6 Verify the following output e VOR LOC FLAG mV 0 mV 25 mV 5 7 4 6 VOR LOC Super Flag Output Test 1
33. 211 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 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 GNC400 Keyboard 1 17 414 00034 01 CDU Front Panel GNC420 Black 1 18 430 00020 01 Knob Vol w C and Dot 1 21 430 00019 00 Decoration 1 22 430 00019 02 Knob Inner w PUSH CRSR 1 23 340 00035 00 Snapdome Array GNC4XX 1 25 012 00270 00 Assy Flex Ckt Dsply Kybd 1 26 012 00271 00 PCB Assy Flex Ckt Pot GNC400 1 27 335 00044 10 Skt Strip 2mm RA 4x10 1 37 253 00068 00 Gasket Foam Adh Backed 1 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 23 Rev C Page 6 24 Rev C Table 6 26 Sub Assy CDU GNC 420 Gray Unit 011 00281 05 Figure 7 4 Bub Number Part Number Part Name Qty 32 011 00340 00 Sub Assy Inc Dec Push Switch 1 28 430 00013 01 Knob Assy Outer GNC400 500 1 20 430 00013 01 Knob Assy Outer GNC400 500 1 1 011 00340 00 Sub Assy Inc Dec Push Switch 1 2 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 012 00258 00 PCB Assy GNC400 Interface Bd 1 31 210 00021 00 Nut Hex Reduced 1 30 211 00030 00 Pin Power Switc
34. 29 Sub Assy GPS400 14 28V Black 011 00504 00 7 10 6 30 Sub Assy GPS400 14 28V Gray 011 00504 10 7 10 6 31 Main Chassis Assy GPS400 14 28V 011 00283 03 7 9 6 32 Main Chassis Assy GPS400 14 28V DO 011 00283 33 7 9 6 33 Nav Chassis Sub Assy GPS400 011 00282 01 7 7 6 34 Sub Assy CDU GPS400 Black 011 00281 03 7 4 6 35 Sub Assy CDU GPS400 Gray 011 00281 06 7 4 Page 6 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Miscellaneous Parts P N 190 000140 05 Part Part Description Unit P N Figure F600 Fuse Submini Axial 7 Amp 350 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 2512 900 010 3 3 501 Fuse 1206 1 Amp 350 1100 00 3 4 502 Fuse 1206 1 Amp 350 1100 00 3 4 170 Lithium Cell 3V PC Mount 850 mAH 360 00009 00 4 2 400 SERIES MAINTENANCE Rage 6 3 Rev C 6 2 1 GNS 430 430A Tables Table 6 1 Sub Assy GNS 430 28V Black Unit P N 011 00280 00 Figure 7 1 Part Number Part Name 9 lt 011 00281 00 Sub Assy CDU GNS430 011 00282 00 Sub Assy Nav Chassis GNC400 011 00283 00 Sub Assy Main Chas GNS430 28V 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00
35. 3 Unsolder the connector wire from the Coax Connector 330 00070 03 4 Remove the three screws 211 60234 04 attaching the Glideslope Board 012 00212 to the Nav Chassis 125 00035 00 and remove the Glideslope Board 012 00212 4 6 REASSEMBLY Reverse the removal instructions to reinstall an assembly Note Ensure that Loctite is used on screws during reassembly 4 7 MEMORY BATTERY REPLACEMENT Each unit uses a 3 V built in lithium battery 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 partial disassembly of the unit will be required to access the battery When replacing the memory battery all user waypoints settings may be lost If this occurs the message Stored Data Lost will be displayed The unit must then be attached to an antenna allowed to search the sky and collect new almanac data before it will be usable again This process may take 20 30 minutes Before beginning replacement of the memory battery transfer all waypoints and routes to a user data card so that they may be transferred back to the unit following battery replacement aan d 00 000000000 MEMORY E E BATTERY n mam 170 n J 000
36. 6 5 Lighting Bus 5 43 5 7 6 6 Memory Battery Voltage el tarde 5 44 5 7 6 7 Display Pattern Test 5 45 5 7 6 8 Fan T6SL ice eo RD M 5 45 5 7 6 9 Dui Contdurat rn Test uuu uuu 5 45 5 7 6 10 GPS Antenna Bias osos ven det aera 5 45 53 611 GPS NoISB m 5 45 5 7 6 12 Satellite Tra king Test es ERR qus 5 46 5 7 6 13 MAIN Lateral LEFT RIGHT Outputs 5 47 400 SERIES MAINTENANCE MANUAL Page vii P N 190 00140 05 Rev C SECTION 5 ALIGNMENT CALIBRATION AND TESTING continued 5 7 6 14 MAIN Vertical UP DOWN 5 47 5 7 6 15 MAIN To From Outpul ite tee 5 47 5 7 6 16 MAIN Lateral Flag 5 48 5 7 6 17 MAIN Vertical Flag Output a 5 48 5 7 6 18 MAIN Lateral Super Flag 5 48 5 7 6 19 MAIN Vertical Super Flag Output 5 48 5 7 6 20 Annunciate Outputs eur ie 5 49 OB Serial Menace DOE 5 50 5 7 6 22 Discrete Switch and Altitude Inputs
37. 6 Main Chassis Assy GNS430 14 28V 011 00283 10 7 2 6 7 Main Chassis Assy GNS430 14 28V DO 011 00283 30 7 2 6 8 Main Chassis Assy GNS430 28V 011 00283 00 7 2 6 9 Main Chassis Assy GNS430A 28V 011 00283 20 7 2 6 10 Nav Chassis Sub Assy GNS430 430A 011 00282 00 7 3 6 11 Sub Assy CDU GNS430 Black 011 00281 00 7 4 6 12 Sub Assy CDU GNS430 Gray 011 00281 04 7 4 6 13 Sub Assy CDU GNS430A Black 011 00281 00 7 4 6 14 Sub Assy CDU GNS430A Gray 011 00281 04 7 4 400 SERIES MAINTENANCE MANUAL 6 1 Rev GNC420 420A Table Part Description Unit P N Figure 6 15 Sub Assy GNC420 28V Black 011 00506 00 7 5 6 16 Sub Assy GNC420 14 28V Black 011 00506 10 7 5 6 17 Sub Assy GNC420 14 28V Gray 011 00506 30 7 5 6 18 Sub Assy GNC420A 28V Black 011 00837 00 7 8 6 19 Sub Assy GNC420A 28V Gray 011 00837 10 7 8 6 20 Main Chassis Assy GNC420 28V 011 00283 01 7 6 6 21 Main Chassis Assy GNC420 14 28V 011 00283 11 7 6 6 22 Main Chassis Assy GNC420 14 28V DO 011 00283 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 00281 05 7 4 6 27 Sub Assy CDU GNC420A Black 011 00281 01 7 4 6 28 Sub Assy CDU GNC420A Gray 011 00281 05 7 4 GPS400 Table Part Description Unit P N Figure 6
38. Board Covers 115 00203 00 115 00205 00 and 115 00207 00 2 Unsolder the wire from Coax Cable Connector 330 00070 04 3 Remove two screws 211 63234 10 attaching the 25 pin connector to the Main Chassis 125 00034 01 4 Remove three screws 211 60234 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 transistor 6 Remove two Hex Standoffs 214 00023 00 on each side of the transistor using a 0 187 inch 3 16 hex socket tool and remove Com Board e Inverter Board Figure 7 2 1 Disconnect the wire connector from the Inverter Board 012 00256 00 2 Remove three Screws 211 60234 06 and remove the Inverter Board 012 00256 00 4 5 5 Remove Faulty Boards from the Main Chassis Underside Cavity To access the bottom sub assemblies hinge open the Main Chassis from the Nav Chassis paragraph 4 5 3 e Map Board Figure 7 2 Remove the screw 211 60234 11 attaching the Map Board 012 00296 00 to the Main Board 012 00347 3X and lift the Map Board off the Connector 400 SERIES MAINTENANCE MANUAL Page 4 5 P N 190 00140 05 Rev C e GPS Module Figure 7 2 1 2 Disconnect the Ribbon Cable from the GPS Module 011 00474 Remove screw 211 60234 11 attaching the Map Board 012 00296 00 to the Main Chassis 125 00034 01 Remove 3 of 5 screws 211 63234
39. CRSR 340 00035 00 Snapdome Array GNCAXX 012 00270 00 PCB Assy Flex Ckt Dsply Kybd 012 00271 00 PCB Assy Flex Ckt Pot GNC400 335 00044 10 Skt Strip 2mm RA 4x10 253 00068 00 Gasket Foam Adh Backed a 2 42 42 42 4 42 42 4 42 4 o 2 oa a a 2 42 4 o 42 42 42 4 42 4 4 a 4a a 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 15 Rev C 6 2 3 GNC 420 420A Tables Table 6 15 Sub Assy GNC 420 28V Black Unit P N 011 00506 00 Figure 7 5 Part Number 011 00281 01 011 00282 01 011 00283 01 011 00460 40 115 00218 00 115 00246 00 115 00246 01 145 00480 02 161 00201 02 161 00422 00 211 00052 01 211 00054 01 211 60234 06 211 60237 10 211 63234 10 Part Name Sub Assy CDU GNC420 Sub Assy Nav Chassis w o Nav Sub Assy Main Chas GNC420 28V Sub Assy Memory Card Dummy SMP Cover Top Main Chas GNC400 SMP Hinge GNC400 Front SMP Hinge GNC400 Rear PMP Bezel Cover GNS430 LbI S N GNC420 Bezel Cover Warning 9 lt Screw Shoulder Special Nylon Hinge Pin Nylon Locking Screw 4 40x 187 PHP SS P w NYL Screw 6 32x 375 PHP SS P w NYL Scr 4 40x 375 FLHP100 SS P Nyl olm Table 6 16 Sub Assy GNC 420 14 28V Black Unit P N 011 00506 10 Figure 7 5 Part Number 011 00281 01 Part Name Qty Sub Assy CDU GNC420 Page 6 1
40. GNC400 1 27 335 00044 10 5 Strip 2mm RA 4x10 1 37 253 00068 00 Gasket Foam Adh Backed 1 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 14 Sub Assy CDU GNS 430A Gray Unit P N 011 00281 04 Figure 7 4 Bub Part Number Part Name lt 1 011 00340 00 Sub Assy Inc Dec Push Switch 6 210 00021 00 Nut Hex Reduced 211 00030 00 Pivot Pin Power Switch 117 00028 00 Shaft Pot Machined GNC4XX 430 00013 01 Knob Assy Outer GNC400 500 430 00013 01 Knob Assy Outer GNC400 500 117 00028 00 Shaft Pot Machined GNC4XX 211 00030 00 Pivot Pin Power Switch 210 00021 00 Nut Hex Reduced 011 00340 00 Sub Assy Inc Dec Push Switch 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 410 00012 01 Rtry Sw Pot w Mom Push Sw 410 00013 01 Rtry Pot w Mom Push Sw w hole 012 00258 00 PCB Assy GNC400 Interface Bd 440 00016 03 LCD Module DSTN Color W Lens 145 00267 00 PMP Data Card Slots 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 125 00041 05 DCP Bezel Painted Gray 211 63232 08 Screw 2 56x 250 FLHP100 SS P 012 00257 00 PCB Assy GNC400 Keyboard 414 00034 10 CDU Front Panel GNS430 Gray 430 00020 01 Knob Vol w C and Dot 430 00020 02 Knob Vol w V and Dot 430 00019 01 Knob Inner w PUSH C V 430 00019 02 Knob Inner w PUSH
41. GNC500 125 00034 01 Main Chas w o Studs GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 10002 02 Xstr Mosfet N Ch BB 28V D1018 2 42 4 po 42 4 p N o o m o Aasljasjasjasyaslasyalslayjaja 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 10 Nav Chassis Sub Assy GNS 430 430A Unit P N 011 00282 00 Figure 7 3 Part Number Part Name lt 012 00195 20 PCB Assy Nav Revr GNC400 500 012 00212 10 PCB Assy GNC400 Glide Slope 115 00209 00 SMP Cover Cont GNC400 Nav Bd 115 00213 00 SMP Cover RF GNC400 Nav Bd 115 00214 00 SMP Cover Mdl GNC400 Nav Bd 115 00221 00 SMP Cover GNC400 G S Bd 115 00321 00 SMP Fan Shield GNC400 125 00006 00 DCP Pawl Latch
42. GPS150 125 00035 00 DCP Nav Chassis GNC400 210 00043 00 Nut Special M4x0 7 211 00027 01 Screw Insert Extract w Flat 211 00037 00 Set Screw M3x0 5x2 6 211 60234 04 Screw 4 40x 125 PHP SS P w NYL 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 10 Screw 4 40x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 212 20004 00 Wshr Flat Non standard S S 233 00009 00 Pin Nylon 250 00048 00 Insulator Nav Bd GNC400 250 00049 00 Insulator G S Bd GNC400 253 00053 01 Gasket EMI 2 685 Length 253 00053 02 Gasket EMI 0 750 Length 325 00063 01 Ca Asy Rbn Ca Stp 2mm Ctrs 2x8 330 00070 03 Conn Coaxial Blind Thd 371 00001 00 Blowers Fan 30x30x6mm 5VDC alm 1 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 11 Rev C Table 6 11 Sub Assy CDU GNS 430 Black Unit P N 011 00281 00 Figure 7 4 Page 6 12 Rev C Bub Part Number Part Name Qty 1 011 00340 00 Sub Assy Inc Dec Push Switch 1 6 210 00021 00 Nut Hex Reduced 1 7 211 00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 20 430 00013 01 Knob Assy Outer GNC400 500 1 28 430 00013 01 Knob Assy
43. Hz 7 37 KHz offset for measuring the 8 33 kHz receiver selectivity The following equipment or suitable substitutes can be used in place of the radio test set 50 Watt 30 dB Attenuator for the output of the Bird Wattmeter 40 dB Attenuator Circuit Shown in Figure 5 1 6dB Attenuator Circuit Mini Circuits Model CAT 6 Crystal Detector Narda 503 03 Frequency Counter HP53131A Oscilloscope Tektronix TDS 3012 Signal Generator IFR or Marconi 2030 with options 1 and 6 RF Wattmeter Bird 4431 with element 25C Audio Distortion Analyzer HP 8903B Page 5 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 30 dB BIRD f UNIT UNDER 50 OHM LOAD 50 WATT ATTENUATOR WATTMETER TEST RF INPUT NOTE 50 OHM LOAD IS NOT REQUIRED IF 30 dB ATTENUATOR IS USED N THE 30 dB ATTENUATOR WILL RF LOWER THE VSWR TO 1 1 1 ATTENUATOR 82k EVEN IF LEFT OPEN ON THE OUTPUT SIDE 51 OHMS x A ATTENUATED RF OUTPUT Figure 5 1 40 dB Attenuator Circuit 5 3 TEST SETUP The test setup is configured by the 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 loads for testing the 400 Series units 5 4 1 VHF COM TRANSCEIVER 5 4 1 1 Standard Loads Antennas The VHF com transceiver shall op
44. NOT USED GPS RS232 OUT4 GPS RS232 IN4 GPS RS232 OUT2 GPS RS232 2 J1 19 lt DPDT SWITCH A 20 So 28 VDC 3 AMP 77 78 39 TO J1 PIN 72 lt 28 VDC 3 AMP 0 28 VDC OR 0 5 Vrms 400 Hz 40 70 REFERENCE INPUT FOR THE LIGHTING BUS 04 o 69 68 2 67 AL 375 66 A KR A KR K KR KR KR 65 82 76 64 Bay 63 UN 62 C2 61 lt 60 21 22 i 333 OHMS 25 26 67 5 23 333 0HMS 2L 17 27 gt 56 OHMS 28 V 14 WATTS 333 OHMS 28 OHMS 13 8 V TWATTS 28 29 30 A 333 OHMS 18 10 gt 56 OHMS AT 28 V 14 WATTS 28 OHMS 13 8 5 11 EACH OUTPUT 11 9 THROUGH 1 13 RESISTOR TO EXTERNAL VOLTAGE SOURCE SUCH THAT IT WILL SOURCE 12 13 275 mA WHEN GROUNDED xd 28V 100 OHMS 8W v v v V V 15 37 38 43 d 14V 51 OHMS 4W gt 1 LL J1 43 THROUGH J1 45 gt i 28V 11K 1 W 14 560 OHMS 0 5 W 45 46 47 48 LOOPBACK 49 50 A A 51 52 53 54 55 LOOPBACK 58 59 lt GNS 430 GPS OBS ROTOR H GPS OBS ROTOR C GPS OBS STATOR D GPS OBS STATORE GPS OBS STATOR F MAIN OBS STATOR G
45. NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 00018 00 Xstr Mosfet N Ch Push Pull VHF 2 42 4 p a 2 2 2 42 po nlo oa rm o a Aa j Aa jAasjafasjalaljaja 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 8 Main Chassis Assy GNS 430 28V Unit P N 011 00283 00 Fig 7 2 Part Number Part Name 9 lt 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00214 03 PCB Assy Comm 2 5ppm TCXO 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 32 PCB Assy GNS430 Main Bd DO 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chs s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS
46. No 015 00837 XX Rev A 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 19 page 7 20 blank Rev 115 00354 00 j 1 60234 11 012 00296 00 211 60334 08 2 PLCS 211 60234 06 2 PLCS 012 00347 0 250 00050 01 334 00039 02 po 63254 10 6 PLCS Ne lt H s lt j gt 2 PLCS 251 00020 00 NOTES 1 USE 291 00023 02 LOCKING COMPOUND ON ALL THREADED FASTENERS UNLESS OTHERWISE NOTED OR PRE APPLIED 211 60234 06 3 PLCS ot 2 00256 00 125 00034 01 REF Figure 7 9 Main Chassis Assy GPS 400 Dwg 015 00283 03 Rev J 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 21 page 7 22 blank Rev 211 00052 01 2 PLCS 011 00283 XX y 211 00054 01 2 5 211 60237 10 3 2 PLCS 011 00282 01 BOTTOM VIEW 161 00201 XX SEE NOTE 2 211 60234 06 A NOTES 1 ALL THREADED FASTENERS SHALL HAVE THREAD LOCKING COMPOUND 291 00025 02 UNLESS OTHERWISE NOTED OR PRE APPLIED 2 FOR UNITS THAT HAVE HAD ECO 11799 INCORPORATED ENSURE THAT MOD STATUS 1 HAS BEEN PERMANENTLY MARKED OUT ON UNIT SERIAL TAG 161 00201 XX 011 00285 5 REF 211 63234 10 4 PLCS 011 00281 0 011 00460 40 VIEW NAV CHASSIS OMITTED FOR CLARITY F
47. Outer GNC400 500 1 29 117 00028 00 Shaft Pot Machined GNC4XX 1 30 211 00030 00 Pivot Pin Power Switch 1 31 210 00021 00 Nut Hex Reduced 1 32 011 00340 00 Sub Assy Inc Dec Push Switch 1 2 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 6 3 410 00012 01 Sw Pot w Mom Push Sw 1 4 410 00013 01 Rtry Pot w Mom Push Sw w hole 1 5 012 00258 00 Assy GNC400 Interface Bd 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 TFM 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 GNC400 Keyboard 1 17 414 00034 00 CDU Front Panel GNS430 Black 1 18 430 00020 01 Knob Vol w C and Dot 1 19 430 00020 02 Knob Vol w V and Dot 1 21 430 00019 01 Knob Inner w PUSH C V 1 22 430 00019 02 Knob nner w PUSH 1 23 340 00035 00 Snapdome Array GNC4XX 1 25 012 00270 00 PCB Assy Flex Ckt Dsply Kybd 1 26 012 00271 00 PCB Assy Flex Ckt Pot GNC400 1 27 335 00044 10 Skt Strip 2mm RA 4x10 1 37 253 00068 00 Gasket Foam Adh Backed 1 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 12 Sub Assy CDU GNS 430 Gray Unit P N 011 00281 04 Figure 7 4 Bub Part Number Part Name lt 1 011 00340 00 Sub Assy Inc Dec Push Switch 6 210 00021 00 Nut Hex Reduced 211 00030 00 Pivot Pin Power Switch 117 00028 00 Sh
48. Output Level 1 Apply a standard audio test signal having a RF level of 93 dBm Select maximum audio volume control turned fully clockwise and turn off the ident filter Measure 500 VOR ILS AUDIO HI 16 16 with respect to 500 VOR ILS AUDIO LO J6 17 Verify an audio output level into a 500 Ohm load that is not less than 20 Vpp 7 07 Vrms Audio Output Level NLT 20 Vpp Select minimum audio volume control turned fully counter clockwise without turning off Verify an audio output level 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 Turn the ident filter off 2 With an RF input level of 73 dBm measure 500 Q VOR ILS AUDIO HI J6 16 with respect to 500 Q VOR ILS AUDIO LO J6 17 for 350 1000 and 2500 Hz 3 Set audio output to 7 07 Vrms 1000 Hz then verify the difference between the maximum and minimum VOICE IDENT audio output levels is less than 6 dB at the three frequencies listed above Max and Min Levels lt 4 Measure 500 VOR ILS AUDIO J6 16 with respect to 500 VOR ILS AUDIO LO J6 17 for 150 Hz relative to the peak audio level frequency and for 9000 Hz relative to the peak audio level frequency 5 Verify the output is not less than 20 dB relative to 1 kHz audio output Output NLT 20 dB 400 SERIES MAINTENANCE MANUAL Page 5 25 P N 190 00140 05 Rev C 5 7 33 Voice ldent Audio Distortion
49. P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 214 00023 00 Stdoff Male Fem Hex 4 40 38 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 00018 00 Xstr Mosfet N Ch Push Pull VHF 925 D2120 00 Posistor 330 1 5K Ohm 120C THM 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 9 Rev C Table 6 9 Main Chassis Assy GNS 430A 28V Unit P N 011 00283 20 Figure 7 2 Page 6 10 Rev C Part Number Part Name lt 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 32 PCB Assy GNS430 Bd DO 012 00611 00 PCB Assy Comm Xcvr 16 Watt 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS
50. ROTOR C VOR OBS STATOR D VOR OBS STATOR E G VOR OBS STATOR F NAV OBI CLOCK NAV OBI DATA NAV OBI SYNC NAV PAR DME 8 MHZ DME SERIAL CHANNEL REQUEST NAV PAR DME 4 MHZ SERIAL DME RNAV MODE NAV PAR DME 2 MHZ NAV PAR 1 MHZ NAV PAR DME 800 KHZ NAV PAR DME 400 KHZ NAV PAR DME 200 KHZ NAV PAR DME 100 KHZ NAV PAR DME 50 KHZ NAV DME COMMON 500 OHM NAV AUDIO HI 500 OHM NAV AUDIO LO NAV REMOTE TRANSFER AIRCRAFT POWER AIRCRAFT GROUND NAV SER DME DATA NAV SER DME CLOCK NAV IF AGC VLOC 429 OUTB VLOC 429 OUTA G S IF AGC VLOC 429 IN B VLOC 429 INA NAV RECEIVER ANTENNA J6 5 1 gt 1KX3 333 OHMS I x 1 1 gt i i i 200 OHMS X 3 67 OHMS 2 Y Y 3 gt i i i 1K X 3 333 OHMS gt hd I 15 gt 28 OHMS 7 W 13 8 V AIRCRAFT POWER 8 S 56 OHMS 14 W 28 V AIRCRAFT POWER I iv K i 29 gt 28 14 32 gt 14 700 OHMS 0 5 W 333 0HMS 31 Y Y gt 30 333 OHMS 38 10 yr PTS 18 1 28 0HMS 7 W 13 8 V AIRCRAFT POWER 9 Y y 56 OHMS 14 W 28 AIRCRAFT POWER 3 B BFGOODRICH PRESICION TRACK 1 Y Y A SELECTOR 12 D i 25 gt I I E 28V 1 4K 1W gt 44 700 OHMS 0 5 Q 26 9 9 gt 14 20 X SERIAL DME CHAN REQ SWITCH 5 9 1 2 06
51. Receivers ILS Glideslope Receiver 400 SERIES MAINTENANCE MANUAL Page 1 3 P N 190 00140 05 Rev C 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 signal descriptions for each unit Also see Figure 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 all the components of the unit and provides the interface with the pilot and other avionics installed in the aircraft The Main Board performs the following functions 1 Communicates with all components of the unit 2 Displays and controls interface with the pilot 3 Displays the navigation database via a removable memory card for use by the pilot flight crew 4 Area navigation functions using the determined position velocity and stored navigation data 5 Interfaces with other flight instruments such as a moving map autopilot CDI HSI indicators altitude encoder fuel manageme
52. SERIAL DME RNAV MODE SWITCH 33 gt wo gt 37 gt EE 39 Samo 8 10 Sawo 7 42 00 43 0 22 oo 16 gt 500 OHMS 17 gt NAV AUDIO OUT T i 28 lt 1 NAV TRANSFER SWITCH 28 M POWER SUPPLY 19 gt T i 360 OHMS 18 gt I X iw OHMS 7 gt 23 gt 24 gt 34 gt 35 36 RF SIGNAL J5 GENERATOR SECTION 3 TROUBLESHOOTING CAUTION ELECTROSTATIC SENS T VE NFVICFS Each unit in the 400 Series contains static sensitive components Observe proper anti static procedures when testing the unit Hazardous voltages exist on the Inverter Board all units Under normal operating conditions the voltages range up to 2500 Vac peak to peak Under open circuit conditions voltages can range over 8000 Vac peak to peak Exercise extreme caution during unit troubleshooting Death or serious injury could result from electrical shock See other general maintenance warnings and cautions on page ii 3 1 TROUBLESHOOTING EQUIPMENT The equipment used in testing a unit can be used to troubleshoot a faulty unit See Sections 2 and 3 3 2 TROUBLESHOOTING ORDER Start troubleshooting a unit by following steps one through three listed below not necessarily in the order listed Once it has been determined that these three items are not the cause of failure proceed with troubleshooting using the static messages and performance testing paragraphs 3 4 and 3 5 To he
53. Signal used for both card chips only 1 should be low at a time and selecting map N CCSRON_MCSON CCSR3N_MCS3N CMA14 CMA23 40 49 CCSLON MA24 50 53 CCSL3N_MA27 12V_REG M CFG3 M CFG 58 61 WR TESTN SPARE 63 66 HSBUS A 67 68 LO Not used HSBUS B UXLAOI Uart Xilinx LCD Address 1 Reset Not output Low when resetting Bl Data I O Address 01 13 output Card and Map Address output Used for both addressing map and card data Card Chip Select Left 0 3 not and Map Address 24 27 Used for chip selects of left card only 1 of 4 should be low at a time and addressing map data 12 V de 5 output VCC GND 1 Map Configuration Input 3 0 0 Write Test Not Output pulses low for typical times of 60 120 and 180 ns depending on wait states and only if the J1 76 TEST MODE SELECT is low Also see J14 46 LFT A22 i 71 2 18 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05
54. Test signal at 108 00 MHz 3 Measure at the 500 VOR ILS AUDIO HI J6 16 and 500 VOR ILS AUDIO J6 17 outputs 4 Verify the Audio SINAD or SNR is greater than 25 dB Audio SINAD gt 25 dB 5 7 37 Ident Voice Tone Ratio 1 Apply a 67 dBm RF level to the RF input 2 Apply a Standard VOR Audio Test signal with modulation frequency of 1020 Hz at 108 00 MHz 3 Measure at the 500 O VOR ILS AUDIO HI J6 16 and 500 VOR ILS AUDIO LO J6 17 outputs set to 77 07 Vrms 4 Toggle between IDENT mode and VOICE mode and verify the ident voice ratio is greater than 20 dB dent Voice Ratio gt 20 dB 5 Apply a Standard Localizer Audio Test signal with modulation frequency of 1020 Hz at 108 10 MHz 6 Measure at the 500 VOR ILS AUDIO HI J6 16 and 500 VOR ILS AUDIO J6 17 outputs 7 Toggle between IDENT mode and VOICE mode and verify the ident voice ratio is greater than 20 dB dent Voice Ratio gt 20 5 7 3 8 Harmonic Distortion 1 Apply a 53 dBm signal amplitude modulated 30 at 1 kHz IDENT Mode Selected 2 Measure at the 500 Q VOR ILS AUDIO HI J6 16 and 500 Q VOR ILS AUDIO LO J6 17 outputs and set to 7 07 Vrms 3 Verify the total harmonic distortion is less than 5 THD lt 5 400 SERIES MAINTENANCE MANUAL Page 5 27 P N 190 00140 05 Rev C 5 7 3 9 VOR Flag Sensitivity A VOR LOC FLAG output voltage of greater than 260 mV fully conceals the indicator flag HIDE
55. a period of a few minutes If the unit indicates SEARCH SKY instead of ACQUIRING it must search the sky for available satellites and collect almanac data search the sky operation may take 20 30 minutes to complete Unit must then enter 3D navigation mode Verify a 1 0 0 001 mSec pulse high every second is present on the time mark out line The unit must display the following 1 2 Four satellites with signal strength 3 or greater The average signal strength on satellites above 20 degree elevation shall be greater than or equal to 3 5 see Pilot s Guide for instructions Satellites that are acquiring should not be included in the average signal strength calculation Use the Main CDI OBS Config Test Page Figure 5 9 to select correct test parameters for tests 5 7 6 12 through 5 7 6 19 Page 5 46 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 HAIN CDI OBS CONFIG CDI NAY FLAG TO FROH LAT Center Hidden Hidden vERT Center Hidden SELECTED COURSE GPS Figure 5 9 Main CDI OBS Configuration Test Page 5 7 6 13 MAIN Lateral LEFT RIGHT Outputs Measure J1 21 output relative to J1 22 output Load 333 ohms three 1000 ohm loads across J1 21 and J1 22 Note that full left right 150 mV are also available selections but are not tested MAX LEFT 300 15 mV CENTER 0 34 5 mV MAX RIGHT 300 315 mV 5 7 6 14 MAIN Vertical UP DOWN Outputs 1 Measure J1 27 output relative t
56. aO 1 5 1 5 3 Nav e ie be Pe 1 5 1 9 4 GPS s 1 5 1 5 5 Glideslope PE 1 6 1 9 6 Invert r e IS E 1 6 1 5 7 GU Assembly un o 1 6 1 5 8 Map 1 6 SECTION 2 SPECIAL TOOLS AND TEST EQUIPMENT Paragraph Page 2 1 INTRODUCTION te oat unus Sau end na 2 1 2 2 SPECIAL TOOLS AND TEST EQUIPMENT 0 2 1 2 3 TEST PANES AND CAB E S dg ae vets sca SQ SA UO Na SY 2 1 400 SERIES MAINTENANCE MANUAL Page iii P N 190 00140 05 Rev C SECTION 3 TROUBLESHOOTING Paragraph Page 3 1 3 1 3 2 TROUBLESHOOTING 3 1 3 8 5 3 2 3 3 1 Madani a saya 9 2 3 3 2 Power Supply Ghe ks 3 4 3 3 2 1 Current 3 4 33 22 Com uec e De e Pa 3 5 3 3 2 3 Glideslope MP 3 6 3 324 Nav Boa A speed 3 6 3 3 3 Processor Glock Gheck
57. added a 1000 Hz signal amplitude modulating the carrier 30 Standard Audio Test Signal Standard audio test signal is a RF carrier amplitude modulated 30 at 1000 Hz The RF input signal shall be at a level of 53 dBm and have a frequency within 0 001 of the assigned carrier frequency Standard VOR Deviation Signal Standard VOR deviation signal is a standard VOR test signal in which the difference in phase between the reference and variable phase signal is 10 0 3 degrees from the setting of the equipment course selector This produces a NAV LEFT output voltage of 150 millivolts 4 5 millivolts Standard VOR Centering Signal Standard VOR centering signal is a standard VOR test signal in which the difference in phase between the reference and variable phase signal is equal 0 3 degree from the setting of the equipment course selector 5 4 5 Localizer 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 calibrated into 50 ohms 5 4 5 1 Standard Test Signals Unless otherwise specified the RF input signals shall be at a level of 53 dBm and have a frequency within 0 001 of the assigned carrier frequency in addition to the characteristics outlined below Note ddm is the difference in depth of modulation The absolute difference in percentage of modulation of two ton
58. person or organization of such changes or improvements GARMIN International Inc 1200 E 1513 Street Olathe KS 66062 USA Telephone 913 397 8200 Aviation Panel Mount Technical Support Line Toll Free 1 888 606 5482 www garmin com RECORD OF REVISIONS REVISION REVISION ECO Insertion Date DATE GNC and GNS are trademarks of GARMIN Ltd or its subsidiaries and may not be used without the express permission of GARMIN Page A 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 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 C 5 2 C 6 2 C A 2 C iii C 5 3 C 6 3 C B 1 C iv C 5 4 C 6 4 C B 2 C 5 5 6 5 3 vi C 5 6 C 6 6 C B 4 C vii C 5 7 C 6 7 C B 5 C viii C 5 8 C 6 8 C B 6 C ix C 5 9 C 6 9 C B 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 6 17 C B 15 C 1 6 C 5 18 C 6 18 C B 16 C 2 1 C 5 19 C 6 19 C 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 BLAN
59. retain a charge shall be discharged only when such grounding does not result in equipment damage If a test connection to energized equipment is required make the test equipment ground connection before probing the voltage or signal to be tested DO NOT SERVICE ALONE Personnel shall not under any circumstances reach into or enter any enclosure for the purpose of servicing or adjusting the equipment without immediate presence or assistance of another person capable of rendering aid 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 US 1 000 000 under Section 2410 of the Export Administration Act of 1979 Include this notice with any reproduced portion of this document 400 SERIES HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification Mod Levels for the 400 Series Mod Levels are listed with the associated service bulletin number service bulletin date and the purpose of the modification The table is current at the time of publication of this manual see date on front cover an
60. see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 Photocell 5 7 6 4 Check Applicable Flex Replace Keyboard see paragraph 4 5 2 1 Replace Main Board see paragraph 4 5 5 Lighting Bus Input 5 7 6 5 Replace Main Board see paragraph 4 5 5 Lighting Bus AC Memory Battery Voltage 5 7 6 6 Replace Memory Battery see paragraph 4 7 1 Display Pattern Test 5 7 6 7 Check Applicable Flex Replace LCD see paragraph 4 5 2 1 Replace Main Board see paragraph 4 5 5 Fan Test 5 7 6 8 Replace Fan Lighting Bus DC 5 7 6 5B Replace Main Board see paragraph 4 5 5 Check Applicable Flex Replace Map Board see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 5 7 6 5 Replace Main Board see paragraph 4 5 5 Unit Configuration Test 5 7 6 9 Replace Main Board see paragraph 4 5 5 Page 3 10 Rev C 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 3 6 Testing Failures Main Board continued TEST FAILURE GPS Antenna Bias GPS Noise Satellite Tracking Test Main Lateral Left Right Outputs Main Vertical Up Down Outputs 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 TEST PARAGRAPH 5 7 6 10 5 7 6 11 5 7 6 12 5 7 6 13 5 7 6 14 5 7 6 15 5 7 6 16 5 7 6 17 5 7 6 18 5 7 6 19 5 7 6 20 5 7 6 21 5 7 6 22 5 7 6 23 5 7 6 23A 5 7 6 23A 5 7 6 24A 5 7 6 24B 5 7 6 24C 5 7 6 24D 5 7 6 25 RECOMMENDED ACTION Replace GPS Module see paragraph 4 5 5 R
61. test frequency Unless otherwise specified set the receive channel to 127 000 MHz Table 5 1 shows the channel ID and frequency for the standard receiver test channels 3 Unless otherwise 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 channel mode Table 5 1 Channel ID and Frequency 25 kHz Channel 8 33 kHz Channel Channel Frequency 118 025 MHz 118 030 MHz 118 025 MHz 127 000 MHz 127 005 MHz 127 000 MHz 136 975 MHz 136 980 MHz 136 975 MHz 5 7 2 1 Power Input Check Before starting com testing verify the following com board power requirements If excessive current readings are noted stop testing and replace the Com Board 1 Receive Mode J2 11 and 12 Voltage 27 5 V Tolerance 20 4 V Max Current 15 mA 2 Transmit Mode 28 Volt Radios J2 11 and 12 Voltage 27 5 V Tolerance 20 4 V Max Current 3 0 A Page 5 14 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 3 Transmit Mode 14 28 Volt Radios J2 11 and 12 Voltage 13 75 V Tolerance 70 2 V Max Current Avg 6 0 A 5 7 2 2 Power Out 1 Set input voltage to 27 5 VDC 10 W 28V units only in TX mode at Pins J2 11 and 12 2 Connect a wattmeter to the antenna output and record the following unmodulated values 118 50 MHz 10 Watts Min 0 dB 1
62. to 5 3 volts with no load Voltage 4 9 to 5 3 V 5 7 6 11 GPS Noise Tests 5 7 6 10 and 5 7 6 11 use the GPS Test Page Figure 5 8 GPS STATUS SVID RSSI SGNL UNIT SNR ROH DRFT asic FREQ RCYR Figure 5 8 GPS Test Page 400 SERIES MAINTENANCE MANUAL Page 5 45 P N 190 00140 05 Rev C Put the unit into Test Mode Turn the small right knob CRSR until you see the GPS Test Page Figure 5 7 Terminate GPS receiver into a 50 ohm load The number represents the receiver noise level Verify this number is within the range of 1450 to 1750 OK 5 7 6 12 Satellite Tracking Test The Satellite Tracking Test ensures that the unit has current almanac information and is able to lock onto a sufficient number of satellites to provide a position This test also verifies that the signal strength of the satellites received is at an acceptable level 1 2 6 Turn unit off Connect the unit to a GA56 antenna mounted outside with a clear view of the sky through a coax with a 10 dB 1 dB cable loss 1 5 GHz Note attenuation pads must not be used since the unit supplies the GA56 with DC power Turn on the unit in Normal Mode Go to the Satellite Data Page see Pilot s Guide for instructions Allow the unit to lock on to the satellites If the unit has current almanac data it will list the visible satellites on the row labeled SAT and it will begin acquiring satellites in
63. 0 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 00018 00 Xstr Mosfet N Ch Push Pull VHF N Ns eo 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 7 Rev C Table 6 7 Main Chassis Assy GNS 430 14 28V DO Unit P N 011 00283 30 Fig 7 2 Page 6 8 Rev C Part Number Part Name 9 lt 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00214 05 PCB Assy Comm 10W 14 28V 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 32 PCB Assy GNS430 Main Bd D O 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chas s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w
64. 0 49 Card and Map Address output Used for both addressing map and card data CCSLON MA24 50 53 Card Chip Select Left 0 3 not and Map Address 24 27 Used for chip selects of left card only 1 of 4 should be low at a time and CCSL3N MA27 addressing map data 12V REG 5 12 V de 5 output 6 O O M_CFG3 M_CF 58 61 Map Configuration Input 3 0 G0 WR TESTN 62 Write Test Not Output pulses low for typical times of 60 120 and 180 ns depending on wait states and only if the J1 76 TEST MODE SELECT is low Also see J14 46 LFT A22 HSBUS A 67 68 LO Not used HSBUS B UXLAOI O Uar Xilinx LCD Address 1 N 400 SERIES MAINTENANCE MANUAL Page B 9 P N 190 00140 05 Rev C B 3 8 J17 Table B 10 J17 Descriptions o Approx 5V FAN_LO 2 o Used to switch fan off and on B 3 9 P13 Table B 11 P13 Descriptions 2 Cold Cathode Transmit A Not logic level output Occurs at 58 5 kHz and is active low This signal is capacitor coupled on the inverter 3 Cold Cathode Transmit Not logic level output Occurs at 58 5 kHz and is active low This signal is capacitor coupled on the inverter CCFT_CURRE 4 I Cold Cathode Fluorescent Tube Current in an input used to measure NT the amount of current leaving the tubes Toggles from a DC resistance of 100 K ohm to 12 VDC to an AC resistance of 10 Kohm The AC resistance mode is used to sample when the CC
65. 0 Dwg No 015 00506 XX Rev Figure 7 6 Main Chassis Assembly GNC 420 A Dwg No 015 00283 01 Rev Figure 7 7 Sub Assy GNC 420 Nav Chassis W O Nav Dwg No 015 00282 01 Rev E e GNC 420 CDU Assembly Drawing Use Figure 7 4 GNC 420A e Figure 7 8 Sub Assy GNC 420A Dwg 015 00837 XX Rev e Main Chassis Assembly GNC 420A Use Figure 7 6 Sub Assy GNC 420 Nav Chassis W O Nav Use Figure 7 7 e GNC 420A CDU Assembly Drawing Use Figure 7 4 400 SERIES MAINTENANCE MANUAL Page 7 1 P N 190 00140 05 Rev C GPS 400 e GPS 400 Assy Drawing Dwg 015 00504 XX Rev G Figure 7 10 Figure 7 9 Chassis Assembly GPS 400 Dwg 015 00283 03 Rev J e GPS 400 Sub Assy Nav Chassis W O Nav Use Figure 7 7 e GPS 400 CDU Assembly Drawing Use Figure 7 4 Page 7 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 211 00052 00 2 PLCS 011 00283 X0 2 PLCS 011 00282 00 Sed 161 00201 0 SEE NOTE 2 NOTES 1 ALL THREADED FASTENERS SHALL HAVE THREAD LOCKING COMPOUND 291 00023 02 UNLESS OTHERWISE NOTED OR PRE APPLIED 2 FOR UNITS WITH MODS INSTALLED PER TABLE 1 INSURE THAT APPLICABLE MOD STATUS NUMBER HAS BEEN PERMANENTLY MARKED OUT ON UNIT SERIAL TAG 161 00201 0X 55 NO 011 00280 00 011 00280 10 00280 10 00280 10 00280 50 011 00280 10 011 00280 30 011 00280 10 011 00280 30
66. 0 ohms measured from the RS232 serial output to ground One standard load shall be connected between VLOC SERIAL OUT J10 10 and GND J10 3 NAV Audio Output Load NAV AUDIO HI to NAV AUDIO LO The standard audio output load shall be 500 ohms connected between NAV AUDIO HI J6 16 and NAV AUDIO LO J6 17 5 4 4 VOR Standard Signals AII 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 calibrated into 50 ohms 5 4 4 1 Standard Test Signals Unless otherwise specified the RF input signals shall be at a level of 53 dBm and have a frequency within 0 001 of the assigned carrier frequency in addition to the characteristics outlined below Standard VOR Test Signal Standard VOR test signal is composed of two components a a RF carrier amplitude modulated 30 with a 9960 Hz signal that is frequency modulated at 30 Hz with a deviation ratio of 16 frequency deviation of 480 Hz for Reference phase REF and b avariable phase VAR 30 Hz signal amplitude modulated 30 with respect to the reference phase signal REF The RF input signal shall be at a level of 53 dBm and have a frequency within 0 001 of the assigned carrier frequency Page 5 6 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Standard VOR Audio Test Signal Standard VOR audio test signal is a standard VOR test signal to which is
67. 00 SERIES MAINTENANCE MANUAL Page 5 17 P N 190 00140 05 Rev C 5 7 2 8 Sidetone 1 Apply a standard mic input signal Measure com audio out and while transmitting verify sidetone level is 1 4 Vrms 0 2 Vrms 118 50 MHz Vrms 127 50 MHz Vrms 136 50 MHz Vrms 5 7 2 9 MIC Intercom Test 1 Remove RF input from the unit 2 Squelch the receive audio enable compressor 3 Apply a 125 mVrms kHz audio signal to the intercom mic audio input Audio Level gt 7 07 Vrms 4 Remove intercom audio input signal 5 7 2 10 Receiver Sensitivity 1 Disable the compressor 2 Apply a2 pV hard 30 modulated 1000 Hz RF signal to the unit and set volume to rated audio 7 07 Vrms 3 Measure the sensitivity in the 25 kHz channel mode signal noise to noise ratio 118 025 MHz gt 6dB 127 000 MHz gt 6dB 136 975 MHz gt 6dB 4 Measure in the 8 33 kHz channel mode 118 030 MHz gt 6 dB 127 005 MHz gt 6 dB 136 980 MHz gt 6 dB Page 5 18 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 2 11 TX Interlock 1 Apply an 10 pV 30 modulated 1000 Hz RF signal 2 Measure SNR at rated audio 7 07 Vrms Sensitivity Reading 3 Enable TX interlock line 4 Measure SNR again Sensitivity 2 15dB difference between sensitivity reading 1 and 2 5 Disable TX interlock line 5 7 2 12 AGC Test 1 Apply a 30 modulated 1000 Hz RF signal to the un
68. 1 00506 10 4 17492 4 17492 5 18118 011 00506 30 5 18118 TABLE 1 MOD STATUS ECO REFERENCE 253 00082 02 NOT USED ON 011 00506 00 211 63254 10 PLCS 253 00062 01 NOT USED ON 011 00508 00 00283 XX REF 011 211 65254 10 4 PLCS VIEW NAV CHASSIS OMITTED FOR CLARITY Ne 011 00281 0X 011 00460 40 Figure 7 5 Sub Assy GNC 420 Dwg 015 00506 Rev 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 13 page 7 14 blank Rev C 115 00354 00 rm 1 60234 11 211 60334 08 3 PLCS 011 00474 XX 211 60234 06 a 2 PLCS 012 00347 2 USED ONLY ON amp 012 00611 00 250 00050 01 554 00039 01 554 00039 02 115 00205 00 115 00203 00 211 60254 08 2 PLCS NOT USED 011 00283 01 NOTE 3 670 00018 00 211 60254 06 925 02120 00 115 00207 00 NOTES 1 NOTE REMOVED 2 SOLDER 670 00018 00 TRANSISTOR IN PLACE AFTER MECHANICAL INSTALLATION 3 AFTER SOLDERING TRIM LEAD ON FAR SIDE OF BOARD TO 055 MAX 4 APPLY A THIN COATING OF THERMAL JOINT COMPOUND 290 00001 00 5 SEE BOM FOR PARTS LIST 253 00061 00 NOTE 4 dme 00 O1 00583 01 00061 2 PLCS 00283 SEE DETAIL B ONLY 211 60234 06 012 00214 05 COMM BOARDS L 250 00047 00 330 00070 04 INCLUDES WASHER NO THREAD LOCKING
69. 10 attaching GPS Module 011 00474 XX to the Main Chassis 125 00034 01 and remove the GPS Module e Main Board Figure 7 2 1 Remove the CDU Assembly paragraph 4 5 2 2 Remove the Map Board paragraph 4 5 5 3 Remove GPS Module paragraph 4 5 5 4 Remove the two screws 211 63234 10 attaching the 78 pin connector to the Main Chassis 125 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 e Nav Receiver Board Figure 7 3 To access the bottom sub assemblies separate the Main Chassis from the Nav Chassis according to the instructions given in paragraph 4 5 3 1 Page 4 6 Rev C Remove the Module Cover 115 00214 00 Disconnect the Ribbon Cable 325 00063 01 from the Nav Receiver Board 012 00195 XX Remove the RF Fence Cover 115 00213 00 Unsolder the wire from the Coax Connector 330 00070 03 Remove five screws 211 60234 04 attaching Nav Receiver Board 012 00195 XX to Nav Chassis 125 00035 00 Remove the two screws 211 63234 10 attaching the 44 pin connector to Nav Chassis 125 00035 00 and remove the Nav Receiver Board 012 00195 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 e Glideslope Board Figure 7 3 1 Remove the Glideslope Board Cover 115 00221 00 2 Disconnect the Ribbon Cable 325 00063 01 from the Glideslope Board 012 00212
70. 100 SS P Nyl Oo NO INI NI N es Part Number Part Name lt 011 00281 06 Sub Assy CDU GPS400 Gray 011 00282 01 Sub Assy Nav Chassis w o Nav 011 00283 33 Sub Main Chassis GPS400 DO 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 03 PMP Bezel Cover GPS400 161 00201 10 LbI S N GPS400 Gray 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Table 6 29 Sub Assy GPS 400 14 28V Black Unit P N 011 00504 00 Figure 7 10 Table 6 30 Sub Assy GPS400 14 28V Gray Unit P N 011 00504 10 Figure 7 10 Page 6 27 Rev C Table 6 31 Main Chassis Assy GPS 400 14 28V Unit P N 011 00283 03 Figure 7 9 Part Number 011 00474 01 012 00256 00 012 00296 00 012 00347 02 115 00337 00 115 00354 00 125 00034 01 211 60234 06 211 60234 11 211 60334 08 211 63234 10 231 00020 00 250 00050 01 250 00051 00 334 00039 02 Part Name Sub A
71. 2 2 OK via the unit test page ensure connection in loopback OK C GPS RS232 3 1 Test both receiver and transmitter 2 Connect the transmitter to the receiver 3 Verify GPS RS232 3 OK via test page OK D GPS RS232 4 1 Test both receiver and transmitter 2 Connect the transmitter to the receiver 3 Verify GPS RS232 4 OK via test page OK 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 5 53 Rev C 5 7 6 25 OBS The load used in the OBS test consists of a calibrated OBS resolver Precision Track Selector or equivalent and must be connected to the GPS OBS inputs The OBS bearing must be consistent to within 2 degrees of the bearing setting If this output requires an alignment this alignment can be done on the unit level by using the configuration page NOTE not the Test Page MAIN CDI OBS CONFIG See Section 5 for instructions on using the configuration 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 Note that the angle displayed is rounded to one tenth of a degree For MAIN OBS ROTOR 1 31 MAIN OBS ROTOR H J1 32 MAIN OBS STATOR D J1 33 MAIN OBS STATOR E J1 34 MAIN OBS STATOR F J1 35 MAIN OBS STATOR G J1 36 1 Set test set to the following angles 2 Using the page MAIN CDI OBS CONFIG configuration page verif
72. 2 42 p N o a mi o AasjAa ja jasyasfasyalslaljaja Table 6 24 Nav Chassis Sub Assy GNC 420 420A Unit P N 011 00282 01 Figure 7 7 Page 6 22 Rev C Part Number Part Name lt 115 00321 00 SMP Fan Shield GNC400 115 00337 00 SMP Conn Cover 25D 125 00006 00 DCP Pawl Latch GPS150 125 00035 00 DCP Nav Chassis GNC400 210 00043 00 Nut Special M4x0 7 211 00027 01 Screw Insert Extract w Flat 211 00037 00 Set Screw M3x0 5x2 6 211 60234 10 Screw 4 40x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 212 20004 00 Wshr Flat Non Standard S S 231 00020 00 Plug BNC Hole 233 00009 00 Pin Nylon 371 00001 00 Blowers Fan 30x30x6mm 5VDC 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 25 Sub Assy CDU GNC 420 Black Unit P N 011 00281 01 Figure 7 4 Bub Number Item Description Qty 32 011 00340 00 Sub Assy Inc Dec Push Switch 1 28 430 00013 01 Knob Assy Outer GNC400 500 1 20 430 00013 01 Knob Assy Outer GNC400 500 1 1 011 00340 00 Sub Assy Inc Dec Push Switch 1 2 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 5 012 00258 00 PCB Assy GNC400 Interface Bd 1 31 210 00021 00 Nut Hex Reduced 1 30
73. 27 50 MHz 10 Watts Min 0 dB 136 50 MHz 10 Watts Min 0 dB 3 Set input voltage to 13 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 MHz 10 Watts Min 0 dB 136 50 MHz 10 Watts Min 0 dB 5 Set input voltage to 27 5 VDC 16 W units in TX mode at Pins J2 11 and 12 6 Connect a wattmeter to the antenna output and record the following unmodulated values 118 50 MHz 16 Watts Min 0 dB 127 50 MHz 16 Watts Min 0 dB 136 50 MHz 16 Watts Min 0 dB 7 Verify that there is no more than 3 watts variation among the three values in steps 2 4 and 6 OK adjusted for a 10 watt carrier 80 AM 1 KHz both 10 and 16 watt versions 400 SERIES MAINTENANCE MANUAL Page 5 15 P N 190 00140 05 Rev C MODULATION A B A B X 100 Figure 5 5 Modulation Measurement Figure 5 5 shows the output of the Narda Crystal Detector displayed on an oscilloscope The oscilloscope must be DC coupled in order for the modulation signal to be displayed correctly 5 7 2 3 Frequency Stability and Tolerance Verify the RF carrier is within 0 0005 5 PPM 136 50 MHz Hz error lt 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 than 70 and not greate
74. 28V DO P N 011 00283 31 Figure 7 6 Item Description lt 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00214 05 PCB Assy Comm 10W 14 28V 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 22 PCB Assy GNC420 Main Bd D O 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chs s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 00018 00 Xstr Mosfet N Ch Push Pull VHF 400 SERIES MAI
75. 3 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 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 GNC400 Keyboard 1 17 414 00034 01 CDU Front Panel GNC420 Black 1 18 430 00020 01 Knob Vol w C and Dot 1 21 430 00019 00 Decoration 1 22 430 00019 02 Knob Inner w PUSH CRSR 1 23 340 00035 00 Snapdome Array GNC4XX 1 25 012 00270 00 Assy Flex Ckt Dsply Kybd 1 26 012 00271 00 PCB Assy Flex Ckt Pot GNC400 1 27 335 00044 10 Skt Strip 2mm RA 4x10 1 37 253 00068 00 Gasket Foam Adh Backed 1 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 25 Rev C Page 6 26 Rev C Table 6 28 Sub Assy CDU GNC 420A Gray Unit 011 00281 05 Figure 7 4 Bub Number Part Number Part Name Qty 32 011 00340 00 Sub Assy Inc Dec Push Switch 1 28 430 00013 01 Knob Assy Outer GNC400 500 1 20 430 00013 01 Knob Assy Outer GNC400 500 1 1 011 00340 00 Sub Assy Inc Dec Push Switch 1 2 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 012 00258 00 PCB Assy GNC400 Interface Bd 1 31 210 00021 00 Nut Hex Reduced 1 30 211 00030 00 Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 9 440 00016 03 LCD Module DSTN Color W Lens 1
76. 400 SERIES MAINTENANCE MANUAL GNS 430 GNC 420 GPS 400 GNS 430 Shown GARMIN International Inc 1200 E 151 Street Olathe KS 66062 USA 190 00140 05 Revision C October 2002 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 without the express prior 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 Information in this document is subject to change without notice GARMIN reserves the right to change or improve its products and to make changes in the content without obligation to notify any
77. 430 must be verified also See the tables listed on page 1 2 for part numbers 5 7 6 1 Push Button Response 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 appropriate unit response OK 5 7 6 3 I D and Data Card Test Apply power to the unit and verify the successful display of the following base map data Base Map data disclaimer Base data profile e g Americas World Base Map version OK Copyright information date and company Data Card profile Cycle version Copyright information date and company Page5 42 400 SERIES MAINTENANCE MANUAL Rev P N 190 00140 05 5 7 6 4 Photocell 1 Turn the unit on in the test mode and verify brightness control is in photo mode using the main lighting page 2 With photocell uncovered ensure display and keyboard backlight LED brightness is proper under normal conditions OK 3 Cover the photocell and verify display and keyboard backlight LED brightness decreases OK 5 7 6 5 Lighting Bus Input If a lighting bus any option other than PHOTO is selected and the lighting bus control is turned to its minimum daytime setting the display brightness will default to tracking the unit s photocell The unit shall read a DC voltage from 0 to 20 volts with an accur
78. 430A Gray 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 325 00063 00 Asy Rbn Ca Stp 2mm Ctrs 2x5 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 6 Main Chassis Assy GNS 430 14 28V Unit P N 011 00283 10 Figure 7 2 Part Number Part Name Qty 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00214 05 PCB Assy Comm 10W 14 28V 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 32 PCB Assy GNS430 Main Bd DO 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chs s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 231 10001 0
79. 5 012 00270 00 Assy Flex Ckt Dsply Kybd 26 012 00271 00 PCB Assy Flex Ckt Pot GNC400 27 335 00044 10 Strip 2mm RA 4x10 28 430 00013 01 Knob Assy Outer GNC400 500 33 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 34 212 00021 00 Wshr Special GPS400 36 115 00341 00 SMP Cover GPS400 37 253 00068 00 Gasket Foam Adh Backed a a a Hll yay ae 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 SECTION 7 ASSEMBLY DRAWINGS 7 1 INTRODUCTION This section contains assembly drawings to aid in assembly and disassembly of the 400 Series units Part numbers and drawing notes can be used as reference information during disassembly and assembly Note The revision levels of the drawings are current at the time of manual publication and are subject to change without notice 7 2 DRAWING LIST The following drawings are included in this section GNS 430 Figure 7 1 Sub Assembly GNS 430 Dwg No 015 00280 XX Rev P e Figure 7 2 Main Chassis Assembly GNS 430 A Dwg 015 00283 00 Rev R e Figure 7 3 Nav Chassis Assembly GNC 400 Dwg No 015 00282 00 Rev K e Figure 7 4 GNC 4XX CDU Assembly Sheet 1 of 2 Dwg 015 00281 XX Rev e Figure 7 4 GNC 4XX CDU Assembly Sheet 2 of 2 Dwg No 015 00281 XX Rev F GNS 430A Use the GNS 430 Figures for the GNS 430A GNC 420 e Figure 7 5 Sub Assembly GNC 42
80. 6 Rev C 011 00282 01 Sub Assy Nav Chassis w o Nav 011 00283 31 Sub Mn Chassis GNC420 Gray DO 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 05 Lbl S N 14 28V GNC420 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 5 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 17 Sub Assy GNC 420 14 28V Gray Unit P N 011 00506 30 Figure 7 5 Part Number Part Name 9 lt 011 00281 05 Sub Assy CDU GNC420 Gray 011 00282 01 Sub Assy Nav Chassis w o Nav 011 00283 31 Sub Mn Chassis GNC420 Gray DO 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 09 LbI S N 14 28V GNC420
81. 7 00 DETAIL 15 00221 00 REF ALIGN EDGE OF EMI GASKET WITH SLOTS SHOWN ON COVER 253 00053 02 REF i ALIGN EDGES OF EMI GASKET WITH SLOTS DETAIL B SHOWN ON COVER 020 015 ux REF 020 3 016 255 00085 0 DETAIL C BNC CONN CENTER CONDUCTOR SOLDER 511 00003 05 NOTE 5 amp 8 055 DETAIL D ALL THEADED FASTENERS SHALL HAVE THREAD LOCKING COMPOUND 291 00025 02 UNLESS OTHERWISE NOTED OR INSTALL PAWL 125 00006 00 INTO CHASSIS 125 00035 00 BY INSERTING INSERT EXTRACT SCREW 211 00027 01 THRU HOLE IN CHASSIS AS SHOWN IN DETAIL A ADVANCE SCREW THRU HOLE PAWL AND CHASSIS PLACE WASHER 212 20004 00 AND NUT 210 00043 00 ON END OF SCREW TIGHTEN NUT UNTIL SNUG AGAINST CHASSIS BACK NUT OFF UNTIL HOLE ALIGNS WITH FLAT ON SCREW INSERT SET SCREW 211 00037 00 AND TIGHTEN PLACE NYLON PIN 255 00009 00 INTO HOLE IN PAWL AND INSERT SET SCREW 211 00037 00 TIGHTEN 211 00037 00 OVER NYLON PIN UNTIL TORQUE REQUIRED TO TURN 211 00027 01 IS BETWEEN 35 amp 65 OZ 2 52 TO 3 96 Kgf cm MOUNT COAXIAL CONNECTOR amp WASHER 330 00070 03 TO NAV CHASSIS 125 00035 00 FROM BACK SIDE DO NOT USE LOCKING COMPOUND INSTALL INSULATORS 250 00048 00 amp 250 00049 00 INTO RECESSES OF CHASSIS FROM TOP SIDE SOLDER BUS WIRE 311 00003 05 INTO NAV BOARD 012 00195
82. 90 00140 05 Table B 7 J12 Descriptions continued Deorum T TL C C ROT LRGA Rotor Right Large A to C are the contacts of a single pole ROT R LRGB triple throw switch The common of the switch is ground ROT R LRGC Only one of the 3 is low at a time ROT R SMLA Rotor Right Small A to C are the contacts of a single pole ROT R SMLB triple throw switch The common of the switch is ground ROT R SMLC Only one of the 3 is low at a time ROT_R SW 2 Push switch on right rotary Active low input UD1 UD8 38 45 O UPPER half display DATA output PHOTOCELL 51 I Photocell input is used to by the board to measure light level Photocells are resistive loads that change with ambient light level 1 moroso s s rus s Po LED COMMON 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 J14 Table B 8 J14 Descriptions I 1 ROT_L_LRGC Rotor Left Large A to C are the contacts of a single pole triple 2 ROT L LRGB ROT L LRGA throw switch The common of the switch is ground Only one of 3 22 CARD 01 20 the 3 is low at a time CARD RDN Card Address 01 to 20 Card Read Not Output pulses low typically for 150 ns or 210 ns depending on the number of wait states when cards are accessed Card Data Left Bit 0 7 These pins f
83. A ADVANCE SCREW THRU HOLE IN PAWL AND CHASSIS PLACE WASHER 212 20004 00 AND NUT 210 00043 00 ON END OF SCREW TIGHTEN NUT UNTIL SNUG AGAINST CHASSIS BACK NUT OFF UNTIL HOLE ALIGNS WITH FLAT ON SCREW INSERT SET SCREW 211 00037 00 AND TIGHTEN PLACE NYLON PIN 233 00009 00 NTO HOLE IN PAWL AND INSERT SET SCREW 211 00037 00 TIGHTEN 211 00037 00 OVER NYLON PIN UNTIL TORQUE REQUIRED TO TURN 211 00027 01 IS BETWEEN 35 amp 55 OZ 2 52 TO 3 96 Kgf cm 3 INSTALL FAN 371 00001 00 WITH SHIELD 115 00321 00 FROM TOP USING 3 4 40 SCREWS 211 60204 10 LOCATE LABEL ON FAN FACING CHASSIS AND POSTION AS SHOWN 125 00035 00 Figure 7 7 Chassis Assy W O Dwg 015 00282 01 Rev 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 7 17 page 7 18 blank Rev 211 00052 00 2 PLCS i gt s 115 00246 01 lt SS 2 lt 211 00054 00 2 PLCS AE 2 PLCS 011 00282 01 BOTIOM VIEW 161 00201 XX SEE NOTE 2 NOTES 1 ALL THREADED FASTENERS SHALL HAVE THREAD LOCKING COMPOUND 291 00025 02 UNLESS OTHERWISE NOTED OR PRE APPLIED 211 50254 06 2 253 00062 02 211 63234 10 vd 2 PLCS 263 00062 01 011 00283 21 REF 211 63234 10 4 PLCS 011 00281 XX 011 00460 40 VIEW NAV CHASSIS OMITTED FOR CLARITY Figure 7 8 Sub Assy GNC 420A Dwg
84. A Black Unit P N 011 00281 00 Figure 7 4 Page 6 14 Rev Bub Part Number Part Name Qty 1 011 00340 00 Sub Assy lnc Dec Push Switch 1 6 210 00021 00 Nut Hex Reduced 1 7 211 00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNCAXX 1 20 430 00013 01 Knob Assy Outer GNC400 500 1 28 430 00013 01 Knob Assy Outer GNC400 500 1 29 1 117 00028 00 Shaft Pot Machined GNCAXX 1 30 211 00030 00 Pivot Pin Power Switch 1 31 210 00021 00 NutHex Reduced 1 32 011 00340 00 Sub Assy lnc Dec Push Switch 1 2 211 60232 06 Screw 2 56x 187 PHP SS P 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 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 1 211 63232 08 Screw 2 56x 250 FLHP100 SS P 3 15 1012 00257 00 Assy GNC400 Keyboard 1 17 1414 00034 00 CDU Front Panel GNS430 Black 1 18 430 00020 01 Knob Vol w C and Dot 1 19 430 00020 02 Knob Vol w V and Dot 1 21 430 0001 9 01 Knob Inner w PUSH C V 1 22 430 0001 9 02 Knob Inner w PUSH CRSR 1 23 340 00035 00 Snapdome Array GNCAXX 1 25 012 00270 00 PCB Assy Flex Ckt Dsply Kybd 1 26 012 00271 00 PCB Assy Flex Ckt Pot
85. Assy CDU GNS 430A Black Unit P N 011 00281 00 Figure 7 4 6 14 6 14 Sub Assy CDU GNS 430A Gray Unit P N 011 00281 04 Figure 7 4 6 15 6 15 Sub Assy GNC 420 28V Black Unit P N 011 00506 00 Figure 7 5 6 16 6 16 Sub Assy GNC 420 14 28V Black Unit P N 011 00506 10 Figure 7 5 6 16 6 17 Sub Assy GNC 420 14 28V Gray Unit P N 011 00506 30 Fig 7 5 6 17 6 18 Sub Assy GNC 420A 28V Black P N 011 00837 00 Figure 7 8 6 17 6 19 Sub Assy GNC 420A 28V Gray Unit P N 011 00837 10 Figure 7 8 6 18 6 20 Main Chassis Assy GNC 420 28V P N 011 00283 01 Figure 7 6 6 19 6 21 Main Chassis Assy GNC 420 14 28V Unit P N 011 00283 11 Fig 7 6 20 6 22 Main Chassis Assy GNC 420 14 28V DO Unit P N 01 1 00283 31 Fig 7 6 6 21 6 23 Main Chassis Sub Assy GNC 420A 28V Unit P N 011 00283 21 Fig 7 6 6 22 6 24 Nav Chassis Sub Assy GNC 420 420A Unit P N 01 1 00282 01 Figure 7 7 6 22 400 SERIES MAINTENANCE MANUAL Page xi P N 190 00140 05 Rev C 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
86. C 5 7 6 23 ARINC 429 Transmitter and Receivers Unit outputs both HIGH and LOW speed signals at the same time in test mode while on the Main Status Loopback Test Page thus both speeds are tested simultaneously For GPS ARINC 429 OUT A 11 46 GPS ARINC 429 OUT B 11 47 GPS ARINC 429 IN 1A 11 48 GPS ARINC 429 IN 1B 11 49 GPS ARINC 429 IN2A 11 50 GPS ARINC 429 IN 2B 71 51 429 1 LOWSPEED HIGHSPEED 429 RX 2 LOWSPEED HIGHSPEED 1 Test both 429 receivers and 429 transmitter 2 Connect 429 transmitter A and B to both 429 receivers Figure 2 2 3 Verify 429 RX 1 LOWSPEED OK and 429 RX 2 LOWSPEED OK via the Main Status Loopback Test Page Figure 5 12 OK 4 Verify 429 RX 1 HIGHSPEED OK and 429 RX 2 HIGHSPEED OK via the Main Status Loopback Test Page Figure 5 12 OK Figure 5 12 Main Status Loopback Test Page OK Page 5 52 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 6 24 RS232 Ports For GPS RS232 OUT 1 J1 56 GPS RS232 IN 1 J1 57 GPS RS232 OUT 2 J1 58 GPS RS232 IN 2 J1 59 GPS RS232 OUT 3 J1 41 GPS RS232 IN 3 J1 42 GPS RS232 OUT 4 J1 54 GPS RS232 IN 4 J1 55 A GPS RS232 1 1 Test both receiver and transmitter 2 Connect the transmitter 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 RS23
87. C C GND 3 o loma 400 SERIES MAINTENANCE MANUAL Page B 5 P N 190 00140 05 Rev C B 3 5 J12 Table B 7 J12 Descriptions LDI through LD8 46 50 LOWER half display DATA output 3 5 CLK ROW Pulse high for typically 310 ns at a period of 33 236 us 30 088 kHz This line loads the next row of data in the display drivers There are 66 CLK ROW pulses for each CLK SHIFT Pulse high for a typical 120 or 180 ns Pulses come in bursts of 90 with about 180 ns of low time between each The bursts of 90 come at the CLK_ROW frequency The rising edge of the first pulse in a burst of 90 is about 1 22 us after the rising edge of a CLK_ROW pulse 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_ROW pulse 6 LCD OFF Notis a output hat tums off the display iow Resistance of input is 10 k ohm to VCC Resistance of input is 2 2 k ohm to VCC O contrastvoltage o I I I I FLM pulse LCD_OFFN 1 10 1 12 13 14 LCD contrast voltage 30 37 65 66 70 W BEZEL_TEMP 16 I Bezel temperature is used by the board to measure temperature PB OUT A PB OUT B PB OUT C PB OUT D PB IN A PB IN B PB IN C PB IN D Push Button Matrix Page B 6 400 SERIES MAINTENANCE MANUAL Rev C P N 1
88. COMMON is less than 4 5 mV 5 Centering Error lt 45 mV 400 SERIES MAINTENANCE MANUAL Page 5 29 P N 190 00140 05 Rev C 5 7 3 16 Course Deviation Accuracy Test Apply a standard localizer deviation test signal 90 Hz greater than 150Hz Verify the deviation measured at VOR LOC LEFT with respect to VOR LOC RIGHT VOR LOC COMMON is 90 mV 9 mV OK 5 7 3 17 VOR OBS Bearing Accuracy 1 Apply a standard VOR test signal and a PTS or similar device at 60 150 240 and 330 degrees in course angle 2 Monitor the bearing information on the unit display while in test mode The OBS bearing is consistent to within 2 degrees of the bearing setting This output requires an alignment This alignment can be done on the unit level by using the unit test page MAIN CDI OBS CONFIG 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 Note that the angle displayed is rounded to one tenth of one degree Verify no error more than 2 degrees Error NGT 2 5 7 3 18 Selectivity 1 Apply 93 dBm CW RF signal at a frequency of 110 0 MHz 2 Measure IF AGC voltage and record as reference 3 Increase the RF level by 6 dB to 87 dbM 4 Adjust the RF frequency above the channel center frequency until the frequency is found that produces an IF AGC voltage equal to the reference IF AGC v
89. D 00 05100 000 a 50006 Figure 3 1 Main Board Fuse Locations Page 3 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 000 00 ao LOCATION OF F600 7A FUSE ON 00 02 03 COM BOARDS 00 oo 000000000000000000000000 000 ihs 200 Us Figure 3 2 Com Board Fuse Location F600 LOCATION OF F600 ON 04 REV COM BOARDS TO PRESENT F600 REPLACED WITH R611 EXCEPT ON 04 REV A AND B BOARD u t3 Qe 0 00 0000000000000000000000 Figure 3 3 Com Board Fuse Location F600 Replaced by R611 00 400 SERIES MAINTENANCE MANUAL Page 3 3 P N 190 00140 05 Rev C pc 00 F501 1 gt F502 1 1 AMP 0
90. EFT One standard CDI deflection load shall be 1000 ohms Three standard loads shall be connected between NAV LEFT J6 5 and NAV RIGHT NAV COMMON J6 6 NAV Course Deviation Flag Load NAV FLAG One standard CDI flag load shall be 1000 ohms Three standard loads shall be connected between NAV FLAG J6 3 and NAV FLAG NAV COMMON J6 4 NAV To From Load NAV TO One standard To From load shall be 200 ohms Three standard loads shall be connected between NAV TO J6 1 and NAV FROM NAV COMMON J6 2 NAV Composite Video Load NAV COMPOSITE OUT One standard composite video load shall be 10 000 ohms connected between NAV COMPOSITE OUT J6 8 and GND J6 41 NAV Super Flag Load NAV SUPER FLAG OUT One standard super flag load shall be 56 ohms connected between NAV SUPER FLAG OUT J6 15 and GND J6 41 400 SERIES MAINTENANCE MANUAL Page 5 5 P N 190 00140 05 Rev C G S Super Flag Load G S SUPER FLAG OUT One standard super flag load shall be 56 ohms connected between G S SUPER FLAG OUT J6 38 and GND J6 41 ARINC 429 Transmitter Load VLOC 429 OUTA OUTB The standard ARINC 429 transmitter load shall be 2 4K ohms resistance and 250 pF capacitance between the differential outputs VLOC 429 OUTA J6 24 and VLOC 429 OUTB J6 23 and 2 4K ohms resistance and 250 pF capacitance connected from each of the outputs to ground RS232 Transmitter Load VLOC SERIAL The standard RS232 transmitter load shall be 300
91. ENS T VE This unit contains static sensitive devices Service personnel must ensure that proper precautions are taken to prevent 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 the Inverter Board all units Under normal operating conditions the voltages range up to 2500 Vac peak to peak Under open circuit conditions voltages can range over 8000 Vac peak to peak Exercise extreme caution during unit testing Death or serious injury could result from electrical shock 5 2 RECOMMENDED TEST EQUIPMENT Test cables and a test panel are supplied by the authorized repair station Load and signal information given in Section 2 and Appendix B can be used to aid in their fabrication Suitable substitutes can be used for the recommended test equipment listed on page 5 2 400 SERIES MAINTENANCE MANUAL Page 5 1 P N 190 00140 05 Rev C Avionics Signal Generator IFR or Marconi 2030 w options one and six BF Goodrich Precision Track Selector Digital Voltmeter HP 34401A GPS Antenna GARMIN GAS6 P N 010 10040 01 Power Supply capable of 10 33 Volts 10 Amps HP 6267B Radio Test Set HP 8920A Modulation Analyzer HP 8901 The RF Signal Generator must have at least a 0 2 parts per million ppm accuracy and the phase noise must be at least 104 5 dBc
92. ESLOPE DOWN 16 31 3 Verify the deviation output voltages GLIDESLOPE UP for the following conditions Full Scale Deflection 0 175 input signal 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 dominant verify the output is 78 7 8 mV FLY DOWN mV 2 With a standard deflection FLY UP condition 150 Hz dominant verify the output is 78 7 8 mV FLY UP mV 5 7 5 3 Course Deviation Flag Test 1 Select Flag HIDDEN 2 Verify the course deviation flag output is 375 80 mV Course Deviation Flag mV 3 Select Flag IN VIEW 4 Verify the course deviation flag output is 0 mV 25 mV Course Deviation Flag mV 400 SERIES MAINTENANCE MANUAL Page 5 37 P N 190 00140 05 Rev C 5 7 5 4 Glideslope Superflag Output Test 1 Select flag HIDDEN 2 Verify GLIDESLOPE superflag output voltage is not less than PWR_IN minus 1 5 V GLIDESLOPE Superflag Output _ _ NLT Power IN minus 1 5 V 3 Select Flag IN VIEW 4 Verify GLIDESLOPE superflag output is 0 250 mV GLIDESLOPE Superflag Output mV 5 7 5 5 Receiver Sensitivity The Glideslope receiver sensitivity is defined as the minimum RF input level of a Standard Glideslope Deflection test signal which results in a maximum de
93. FT 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 is proportional to CCFT duty cycle HEATER Heater on that when high enables the heater This signal is capacitor coupled on the inverter The signal is either low heater off duty cycle of 12 5 hi heater on for 27 5 VDC AIRCRAFT POWER or duty cycle of 50 hi heater on for 13 8 VDC AIRCRAFT POWER 5V MISC CS Dd INVTR_ON ENZ EX Inverter On output that when high enables the inverter flyback supply BULB ON STA Not used RT INV V CTRL 10 Inverter Voltage control analog output ranges from 0 to 5 volts This signal controls the voltage output of the inverter flyback PWR INVTR 11 Inverter Power provides fused AIRCRAFT POWER to the inverter flyback PWR_HTR 12 Heater power provides fused AIRCRAFT POWER to the heater found on the inverter Page B 10 400 SERIES MAINTENANCE MANUAL Rev P N 190 00140 05 B 4 BOARD CONNECTORS 4 1 J2 Table 12 42 Descriptions 1 RESERVED 2 COM IF AGC TEST 3 SQUELCH COMPRESSOR TEST 10 Reserven E i i i i seocowAumol0 20 T m n m 400 SERIES MAINTENANCE MANUAL Page B 11 P N 190 00140 05 Rev C 4 2 J26 10 B 5 B 5 1 Table B 13 J26 Descriptions SERIAL IN Asynchronous serial input SERIAL OUT Asynchronous serial output pot connected between 5V and Gnd spare spare sme
94. Gray 161 00422 00 Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 2 2 5 Table 6 18 Sub Assy GNC 420A 28V Black Unit P N 011 00837 00 Figure 7 8 Part Number Part Name 9 lt 011 00281 01 Sub Assy CDU GNC420 011 00282 01 Sub Assy Nav Chassis w o Nav 011 00283 21 Sub Main Chassis GNC420A 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 07 LbI S N GNC420A Black 161 00422 00 LbI Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 2
95. HTCDID SPAREAD StoreDulibration 5 Test 0123 bx 4587 TEST RHTOBSO SPAREBO ROH STAT EEPROH STATO SYN LOCK 0 6 Normal cx 89AB dx CDEF PTTD xFRD RX D TX 0 HAIN DISCRETE OUTPUTS 6 5 SETUP GPS DIAGNOSTICS PISCHETE G s DDH GROUP Exceptions 117 95 8008 APR D OBS D ILS GPS GPS 0 TERM 0 KEY BKLT 6 5 Zero Dev 6 5 Std Dev 1 INTEG D VLOC O D n wer OBICLOCK D CDI OFFSET DDD 2 0000 8000 ALT o ANNC DO OBI STATUS E EEPROH STATUS D 5 ax 0000 bx a000 fae E ANNC FO OBISYNC 6 0000 dx G008 HAIN ANALOG INPUTS VOR DISCRETE INPUTS A C POHER 008 LTG Bus 000 REHOTE XFR D BEZEL 990 1 Bus pc 000 DHE COHHON D CCFT 008 808 DHE REQUEST 0 HTR 000 PuHoTocELL 000 DE E LcD 000 HAIN CDI 7 OBS CONFIG CDI FLAG TO FROH Lat Center Hidden Hidden vERT Center Hidden SELECTED COURSE 6 5 Figure 5 4 Test Pages 400 SERIES MAINTENANCE MANUAL Page 5 13 P N 190 00140 05 Rev C 5 7 2 Testing Before starting com testing note the following 1 Disable the audio compressor unless otherwise specified The compressor can be disabled for testing purposes by manually grounding the SQUELCH COMPRESSOR TEST input at Pin 3 of J2 2 The 8 33 kHz channel mode uses a channel ID that does not match the actual operating frequency Channel ID is used to specify
96. K 5 26 C 6 26 C F2 9 C 5 27 C 6 27 C F2 10 BLANK 5 28 C 6 28 C 3 1 C 5 29 C 6 29 C 3 2 C 5 30 C 6 30 C 3 3 C 5 31 C 7 1 C 3 4 C 5 32 C 7 2 C 3 5 C 5 33 C F7 3 C 3 6 C 5 34 C F7 4 BLANK 3 7 C 5 35 C F7 5 C 3 8 C 5 36 C F7 6 BLANK 3 9 C 5 37 C F7 7 C 3 10 C 5 38 C F7 8 BLANK 3 11 C 5 39 C F7 9 C 3 12 C 5 40 C F7 10 BLANK 3 13 C 5 41 C F7 11 C 3 14 C 5 42 C F7 12 BLANK 3 15 C 5 43 C F7 13 C 3 16 BLANK 5 44 C F7 14 BLANK F3 17 C 5 45 C F7 15 C F3 18 BLANK 5 46 C F7 16 BLANK 4 1 C 5 47 C F7 17 C 4 2 C 5 48 C F7 18 BLANK 4 3 C 5 49 C F7 19 C 4 4 C 5 50 C F7 20 BLANK 4 5 C 5 51 C F7 21 C 4 6 C 5 52 C F7 22 BLANK 4 7 C 5 53 C F7 23 C F INDICATES FOLDOUT PAGES PRINT ONE SIDE ONLY 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page i Rev C 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 power before making or breaking electrical connections Regard any exposed connector terminal board or circuit board as a possible shock hazard Components which
97. N N C 7 Page B 16 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 8 3 J27 Table 20 427 Description HEATER VIN y o Heater high The heater typical resistance is 16 ohms B 9 GPS MODULE CONNECTORS 9 1 J101 Table B 21 J101 Descriptions Pin Pin DESCRIPTION Name TRAP 0 to 12 V dc 4 Khz PWM output used to position the GPS notch RSSI 2 Relative Signal Strength Indicator input used to position GPS notch via the TRAP output Input impedance AC gt 1 K ohm axx s o ve 7 r Rw 1 B 10 INTERFACE BOARD CONNECTORS 10 1 J19 See Data Card Flex description J14 B 10 2 J20 J20 is the Left Data Card Connector B 10 3 J21 J21 is the Right data Card Connector 400 SERIES MAINTENANCE MANUAL Page B 17 P N 190 00140 05 Rev C B 11 DISPLAY MODULE CONNECTORS B 11 1 J22 See LCD Flex description J12 B 12 DATA BASE CARD CONNECTORS J20 and J21 are the Data Base Card Connectors 13 MAP BOARD CONNECTORS B 13 1 P16 Table B 22 P16 Descriptions CS_MAPN 1 Chip Select Map Not Output pulses low typically for 240 ns when map is accessed RDN Read Not Output pulses low for typical times of 90 150 and 210 ns depending on wait states WRN Write Not Output pulses low for typical times of 60 120 and 180 ns depending on wait states Card Chip Select Right 0 3 not and Map Chip Select 0 3
98. NC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 22 PCB Assy GNC420 Main Bd DO 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chs s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 214 00023 00 Stdoff Male Fem Hex 4 40 38 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 00018 00 Xstr Mosfet N Ch Push Pull VHF 925 D2120 00 Posistor 330 1 5K Ohm 120C THM 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 19 Rev C Table 6 21 Main Chassis Assy GNC 420 14 28V Unit P N 011 00283 11 Fig 7 6 Page 6 20 Rev C Part Number Par
99. NTENANCE MANUAL P N 190 000140 05 Page 6 21 Rev C Table 6 23 Main Chassis Sub Assy GNC 420A 28V Unit P N 011 00283 21 Figure 7 6 Part Number Part Name 9 lt 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00611 00 PCB Assy Comm Xcvr 16 Watt 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 22 PCB Assy GNC420 Main Bd DO 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm Bd 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chs s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 10002 02 Xstr Mosfet N Ch BB 28V 250W 2 2 4a po
100. OMPOSITE OUT Vrms Page 5 28 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 3 12 VOR Course Deviation Sensitivity 1 Apply a standard VOR deviation signal at 108 00 MHz 103 5 dBm RF level to the RF input at a radial of 160 degrees FROM 2 Apply a Precision Test Selector or similar device at 150 degrees in course angle 3 Measure at the VOR LOC LEFT 16 5 and VOR LOC RIGHT VOR LOC COMMON J6 6 outputs Course Deviation Output 150 mV 30mV 5 7 3 13 Localizer Course Deviation Sensitivity 1 Apply a standard localizer deviation signal of 108 10 MHz at a 103 5 dBm RF signal to the RF input 2 Measure at the VOR LOC LEFT 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 gt 45 mV 5 7 3 14 TO FROM Indicator 1 Apply a VOR standard test signal 93dBm 2 Select RF signal input bearings of 75 degrees 0 degrees and 75 degrees from the selected radial and verify that TO FROM state does not change 3 Measure at VOR LOC J6 1 with respect to VOR LOC FROM 16 2 When indicating TO 225 mV 75 mV should be present When indicating FROM 225 mV 75 mV should be present OK 5 7 3 15 Centering Accuracy Apply a standard localizer centering test signal Verify the centering error measured at VOR LOC LEFT with respect to VOR LOC RIGHT VOR LOC
101. PARE INPUT B CDI SOURCE SELECT SPARE INPUT A DEMO MODE SELECT TEST MODE SELECT GROUND GROUND VCC VCC GND 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 3 3 J9 Table 5 49 Descriptions Uv 1 O ivot Supply to NAV board and G S board from Main CPU board sv NAV 2 O 5 vol Supply to NAV board and GS board fom Main CPU board GND oom _ J O 2 vot Supply to NAV board and GIS board fom Main CPU board KEY We EL G S_SERIAL_IN Serial output used to communicate with the processor on the G S board G S SERIAL OUT EE UE Serial input used to communicate with the processor on G S board NAV VOL CONTROL This is a dc output that is connected to the center tap of a pot See 114 41 BOT VLOC SERIAL OUT Serial input used to communicate with the processor on NAV board VLOC SERIAL IN 5 Serial output used to communicate with the processor on the NAV board 9 4 J11 Table B 6 J11 Descriptions 1 O 12 it Supply to COM Board from Main CPU board 2 O 12 vol Supp to COM board from Main CPU board 3 O volt Supply to COM board fom Main CPU board SERIALIN 4 O Serial output used to communicate with the COM board COM SERIAL OUT 5 1 Serial input used to communicate withthe COM board j E volume pot See J14 70 POT_TOP_WPR 7 7 7 _ s L C C C C C C C
102. RD CONNECTOR J2 Nall ae GNC 420 AND GNS 430 GNC 420 AND GNS 430 GPS ANTENNA J3 MAIN BOARD CONNECTOR J1 ALL UNITS 9 A e ALL UNITS GLIDE SLOPE RECEIVER J7 GNS 430 ONLY NAVIGATION RECEIVER J5 GNS 430 ONLY NAV BOARD CONNECTOR J6 GNS 430 ONLY Figure 3 6 External Connectors 37 CONNECTOR DESCRIPTIONS Appendix B contains the pin names numbers and a brief input output description for the external and internal connectors of each 400 Series unit 3 8 BLOCK DIAGRAM Figure 3 7 shows a block diagram for the unit that can be used to help troubleshoot the unit 400 SERIES MAINTENANCE MANUAL Page 3 15 P N 190 00140 05 Rev C This page left intentionally blank Page 3 16 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 COM BOARD S GNC 420 AND GNS 430 a 10 16 WATIT COM CONTROLLER COM RECEIVER 113 KEY BOARD TRANSMITTER amp F 2 No a a EL Ps DIN RIGHT ROTARY J15 R MOMENTARY PUSH BD MAIN BOARD m Bi POWER SUPPLY x 085 J12
103. SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 00 Lbl S N GNS430 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 325 00063 00 Asy Rbn Stp 2mm Ctrs 2x5 N NIN Table 6 2 Sub Assy GNS 430 14 28V Black Unit P N 011 00280 10 Figure 7 1 Page 6 4 Rev C Part Number Part Name Qty 011 00281 00 Sub Assy CDU GNS430 011 00282 00 Sub Assy Nav Chassis GNC400 011 00283 30 Sub Mn Chassis GNS430 14 28V DO 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 04 LbI S N 14 28V GNS430 161 00422 00 Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Perm
104. Select flag HIDDEN Measure VOR LOC SUPER FLAG OUT J6 15 with respect to GND J6 41 2 Verify the VOR LOC SUPER FLAG OUT supplies not less than 500 mA 3 Verify the output voltage is not less than PWR IN minus 1 5 volts VOR LOC SUPER FLAG OUT NLT PWR IN minus 1 5 volts 4 Select flag IN VIEW Measure VOR LOC SUPER FLAG OUT J6 15 with respect to GND 76 41 400 SERIES MAINTENANCE MANUAL Page 5 33 P N 190 00140 05 Rev C 5 Verify the VOR LOC SUPER FLAG OUT output voltage with respect to ground is 0 250 mV 50 ohm load VOR LOC SUPER FLAG OUT 5 7 4 7 Input Lines Monitor the VOR DISCRETE INPUTS Test Page and verify that toggling the below listed inputs between their active and inactive states causes the appropriate status box to change states e Remote Transfer OK DME Common OK DME Request OK e DME RNAV OK 5 7 4 8 OBI Outputs 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 between low lt 1 0 V and high gt 4 0 V states OBI Clock Low High OBI Data Low High OBI Sync Low High ILS APR Low Active High Inactive Page 5 34 Rev C 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 5 7 4 9 NAV Serial DME Outputs Monitor the VOR DISCRETE OUTPUTS Test Page and verify that to
105. Standard audio test signal is an RF carrier amplitude modulated 30 at 1020 Hz Page 5 8 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 5 ALIGNMENT Board alignment is not recommended on any of the 400 Series units Alignment is performed on individual boards at the factory before being shipped as replacement items 5 6 CALIBRATION Calibration can be performed for the following COM Frequency Frequency Spacing SQ 250 the 25 kHz noise squelch SQ 833 the 8 33 kHz carrier squelch Sidetone Audio Output Level MIC Gain The unit must be placed in the configuration mode and the Com Setup Page must be accessed in order to perform calibration Figure 5 2 Figure 5 2 shows the MIC field which is for 05 com boards and 105 00611 00 16 watt com boards only For earlier versions of the board the mic gain is adjusted via potentiometer R558 Figure 5 3 EXE SETUP 136 975 5250 00 SPACING 833 00 SIDETN 00 00 Store Calibration 0 TX Figure 5 2 Com Setup Page Follow these steps to put the unit in configuration mode 1 With power applied to the aviation rack and the 400 Series unit turned off press and hold the ENT key and turn the unit on Release the ENT key when the display activates After the database pages the first page displayed is the MAIN ARINC 429 CONFIG page While in configuration mode pages can be selected by ensuring the c
106. UTS ROH RS 2321 m DISCRETE TOGGLE Ran RS 2322 m OBI CLOCK RS 232 3 m OBI CLOCK D SER DHE CLOCK 0 XILINX RS 232 4 a p gt OBI DATA SER DHE DATA O gt HAP m Ls429cHA m OBI SYNC D ILS APR CONFIG E LS 429 m DATA m HS 429CHA PARALLEL DHE POSN m HS 429 CHB 86080000008 HAIN LIGHTING FLASH HEHORY VOR 7 LOC 7 GS CDI DISPLAY DATABASE CDI FLAG S FLG TO FR 8 Base Map tat Center e Hide Fron SOURCE PHOTO PHOTO TYPE CHIPS SIZE 64K vERT Center Hide RESPONSE B 8 8 8 08 00 ADDRESS DATA HEX 8090808888 F752 HINIHUH 88 OFFSET 88 LCARD ORCARD DATE 7 SETUP VOR SETUP 7 STATUS 7 LOOPBACK UTC DATE UTC GERIT FREQ RAD DDH OBS BRG 01 44 99 16 38 42 SvID 900 117 95 9 000 SGNL uNIT 000 VOR Calibrate OBS Calibrate Caution Changing to the wrong UTC ooo o oe i isiti DRFT satellite acquisition asic n PALPO SVRLDOK E FREQ RCVR RX SIGNAL VOR IDENT D HAIN DISCRETE INPUTS E SETUP HRIN DIAGNOSTICS d4a24b24c24 136 975 POLE 1100 0250 00 GROUP Except ions GRAY CODE 0000000808 Spacing POLE 2 00 50 833 80 522 00 5 00 BKGD DECODED 1 ALTITUDE 18004 25 0 KHz poe 4 66 00 2 Assert TX CaL Ns 00 ver 00 3 Fault 11 FEDC EXTERNAL SHITCH STATE Normal 1 4 Unrecorded NULL DEHO O R
107. acy 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 LIGHTING BUS LO J1 40 A Lighting Bus AC 1 Using the Main Lighting Test Page change the source to 5 in the display and key fields 2 Input a square wave 500 Hz zero to 5 volt signal to pin J1 39 and J1 40 500 Hz 5 volt to 5 volt square wave from the IFR 2030 LF output can be used for this test e Use the Main Analog Inputs Test Page to monitor the test results 3 Verify measured value is 5 00 volts 0 25 VDC To convert the display value to volts V value x 0 03226 Measured Value VDC 4 Vary the input signal amplitude and verify the display lighting changes accordingly 5 Cover the photocell and vary the input signal amplitude verify the key lighting changes accordingly 400 SERIES MAINTENANCE MANUAL Page 5 43 P N 190 00140 05 Rev C HAIN LIGHTING HAIN ANALOG INPUTS A C POHER LTG BUS SOURCE BEZEL TEMP LTG BUS DC RESP Time nin 0 HEH BAT HTR 800 PHOTOCELL LCD Figure 5 7 Main Lighting and Analog Test Pages B Lighting Bus DC 1 Using the Main Lighting Test Page change source to 14 VDC in both the DISPLAY and KEY fields 2 Attach 12 0 VDC to unit pin 11 39 Ensure the power supply ground is connected to unit grou
108. aft Pot Machined GNC4XX 430 00013 01 Knob Assy Outer GNC400 500 430 00013 01 Knob Assy Outer GNC400 500 117 00028 00 Shaft Pot Machined GNC4XX 211 00030 00 Pivot Pin Power Switch 210 00021 00 Nut Hex Reduced 011 00340 00 Sub Assy Inc Dec Push Switch 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 410 00012 01 Rtry Sw Pot w Mom Push Sw 410 00013 01 Rtry Pot w Mom Push Sw w hole 012 00258 00 PCB Assy GNC400 Interface Bd 440 00016 03 LCD Module DSTN Color W Lens 145 00267 00 PMP Data Card Slots 211 14400 05 Screw TCM 1 7x5 0 FLHP S C 125 00041 05 DCP Bezel Painted Gray 211 63232 08 Screw 2 56x 250 FLHP100 SS P 012 00257 00 PCB Assy GNC400 Keyboard 414 00034 10 CDU Front Panel GNS430 Gray 430 00020 01 Knob Vol w C and Dot 430 00020 02 Knob Vol w V and Dot 430 00019 01 Knob Inner w PUSH C V 430 00019 02 Knob Inner w PUSH CRSR 340 00035 00 Snapdome Array GNCAXX 012 00270 00 PCB Assy Flex Ckt Dsply Kybd 012 00271 00 PCB Assy Flex Ckt Pot GNC400 335 00044 10 Skt Strip 2mm RA 4x10 253 00068 00 Gasket Foam Adh Backed a 2 42 7 42 42 4 42 42 42 42 4 o 42 oa a a 2 42 42 o 42 42 42 4 42 4 4 4a 4 a 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 13 Rev C Table 6 13 Sub Assy CDU GNS 430
109. ain 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 Board Power Supply Tolerances Connector Pin Voltage V Tolerance V Max Conditions Remarks Current J2 Pin 11 amp 12 13 75 2 6 0 ADC TX Mode 14 28V 10 Watt Units Only 2 11 amp 12 427 5 28V 10 4 3 0 A DC TX Mode Watt Units Only J2 Pin 11 amp 12 427 5 16 Watt 4 3 0 ADC TX Mode Units Only Modulated transmitter operating into a 50 ohm load 400 SERIES MAINTENANCE MANUAL Page 3 5 P N 190 00140 05 Rev C 3 3 2 3 Glideslope Board Replace the Main Board if any voltage on the G S Board is not within tolerance Replace the G S Board if excessive current is measured Table 3 3 Glideslope Board Power Supply Tolerances Connector Pin Voltage V Tolerance V Comments mA 3 3 2 4 NAV Board Replace the Nav Board if any voltage is not within tolerance or if excessive current is measured Table 3 4 Nav Board Power Supply Tolerances J10 Pin 1 300 J10 Pin 2 200 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 1100 pin 125 remove the Map Board to gain access to 1100 The frequency should be approximately 32 7 MHz If the clock is not operational check J8 4 for 32 7 MHz approxi
110. al 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 Series Installation Manual P N 190 00140 02 1 2 FUNCTIONAL SUMMARY 1 2 1 GPS 400 Position and velocity determination using 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 position velocity and stored navigation data Approach navigation functions and the associated database Interfacing with other flight instruments such as a moving map autopilot CDI HSI including OBS indicators altitude encoder serializer fuel management system and annunciators 14 or 28 volt operation 1 2 2 GNC 420 Performs all functions of a GPS 400 Communications transceiver tuning from 118 000 to 136 9916 MHz in 25 kHz or 8 33 kHz increments Com audio output 10 or 16 watt transmitter 14 or 28 volt operation for 10 watt transmitter 28 V only for 16 watt transmitter 1 2 3 GNS 430 Performs all functions of a GNC 420 VOR and ILS Localizer
111. and a VOR LOC FLAG output voltage of less than 125 mV fully reveals the indicator flag IN VIEW This test requires a Precision Track Selector or similar connected to the NAV OBS circuitry 1 Apply a standard VOR test signal at 108 00 MHz at 103 5 dBm RF signal to the RF input 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 VORLLOC FLAG NLT 260 mV 5 7 3 10 LOC Flag Sensitivity 1 Apply a Standard Localizer Test Signal at 108 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 Apply a LOC Standard Deviation Test Signal 5 Lower the RF level such that it causes the course deviation output VOR LOC LEFT to be less than 5096 of standard deflection 5096 of standard deflection in LOC mode is 45 mV 6 Verify the VOR LOC FLAG output is less than 125 mV Flagged VOR LOC FLAG Output 125 mV 5 7 3 11 VOR LOC Composite Test 1 Apply a standard VOR test signal to the RF input of the NAV receiver Verify the VOR LOC COMPOSITE OUT is 0 5 0 1 Vrms into 10 load VOR LOC COMPOSITE OUT Vrms 2 Apply a standard localizer centering test signal to the RF input of the NAV receiver Verify the VOR LOC COMPOSITE OUT is 0 333 0 05 Vrms into a 10 k ohm load VOR LOC C
112. aph 4 5 6 VOR AGC Replace Nav Receiver Board see paragraph 4 5 6 VOR Audio Sensitivity Replace Nav Receiver Board see paragraph 4 5 6 Receiver Quieting Replace Nav Receiver Board see paragraph 4 5 6 Ident Voice Tone Ratio Replace Nav Receiver Board see paragraph 4 5 6 Harmonic Distortion Replace Nav Receiver Board see paragraph 4 5 6 VOR Flag Sensitivity Replace Nav Receiver Board see paragraph 4 5 6 LOC Flag Sensitivity Replace Nav Receiver Board see paragraph 4 5 6 VOR LOC Composite Test Replace Nav Receiver Board see paragraph 4 5 6 VOR Course Deviation 57 312 Replace Nav Receiver Board see paragraph 4 5 6 Sensitivity Localizer Course Deviation 5 7 3 13 Replace Nav Receiver Board see paragraph 4 5 6 Sensitivity TO FROM Indicator Replace Nav Receiver Board see paragraph 4 5 6 Centering Accuracy Replace Nav Receiver Board see paragraph 4 5 6 Course Deviation Accuracy Test Replace Nav Receiver Board see paragraph 4 5 6 VOR OBS Bearing Accuracy Replace Nav Receiver Board see paragraph 4 5 6 Selectivity Replace Nav Receiver Board see paragraph 4 5 6 Spurious Response VOR LOC Replace Nav Receiver Board see paragraph 4 5 6 Page 3 14 400 SERIES MAINTENANCE MANUAL Rev P N 190 00140 05 3 6 EXTERNAL CONNECTORS Figure 3 6 shows the external connectors and their corresponding pin numbers for each unit 1 5 6 7 8 9 10 11 12 13 eeeeeeeeeeeee 14 15 16 17 18 19 20 21 22 23 24 25 eeeeeeeeeeee COM BOA
113. 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 be run at 27 5 V 56 ohms 14W HIDE AIRCRAFT POWER minus 1 5 VDC min IN VIEW 0 25 VDC max Page 5 48 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 6 20 Annunciate Outputs For Both the OBS and the AUTO outputs are switched by toggling the OBS selection on the Test Page ANNUCIATOR NAV VLOC GPS WAYPOINT TERMINAL A APPROACH B MESSAGE OBS PIN J1 1 J1 2 J1 3 J1 4 J1 5 J1 6 1 7 AUTO 11 8 INTEGRITY C ALTITUDE ALARM 11 9 71 10 71 11 71 12 11 13 ILS GPS APPROACH G 11 14 TIME MARK 11 16 1 Select the Main Discrete Outputs Test Page Figure 5 10 for the Annunciate Outputs test Figure 5 10 Main Discrete Outputs Test Page 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 ILS GPS APR KEY BKLT HARK OBI CLOCK OBI DATA OBI SYNC HAIN DISCRETE OUTPUTS DISCRETE TOGGLE APR OBS GPS 0 TERH 0 INTEG vLOC HSG HPT ALT ANNC D D ANNC E 0 ANNC F 0 FAN Page 5 49 2 Measure at applicable pin Load Resistor to external voltage source such that it will source 275 mA when grounded Note applicable output will sink this current when active 18 ohms 2W when pulled up to 5V ACTIVE 0 3 VDC max INACTIVE NLT pull up voltage
114. ard Flex Left Data Card a pee nt Fi ata Care DISPLAY MODULE m _ DATABASE IwefeBomd PMAPBOARD Mansoa _ MOMENTARY PUSH BD ALL 715 RIGHT Data Card Flex UNITS MOMENTARY PUSH BD GNS J15 LEFT Data Card Flex 430 ONLY MAIN BOARD CONNECTORS 3 1 J1 Table B 3 J1 Descriptions APPROACH ANNUNCIATE ANNUNCIATOR B ALTITUDE ALARMANNUNCIATE 1 ANNUNCIATORF OOO O O 1 1 users MAIN LATERAL SUPERFLAG J n umcmarrPoweR dP 1 2 3 4 D 6 7 8 9 Page B 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Table B 3 J1 Descriptions continued z MAIN MAIN MAIN AIN AIN AIN AIN AIN N aJ AJU NINININ N an MAIN OBS STATOR E 23 Common OBS 34 MAIN OBS STATOR G Common OBS 36 PRESERVED PRESERVED 9 0 2 4 7 8 1 3 D 6 7 8 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 9 0 B 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page B 3 Rev C Page B 4 Rev C 9 2 48 Table B 3 J1 Descriptions continued GPS RS232 IN4 GPS RS232 OUTI GPS 5232 INI GPS RS232 OUT2 GPS RS232 IN2 ALTITUDE C4 ALTITUDE C2 ALTITUDE Cl ALTITUDE B4 ALTITUDE B2 ALTITUDE Bl ALTITUDE A4 ALTITUDE A2 ALTITUDE Al ALTITUDE D4 OBS MODE SELECT S
115. at minus 0 2V 5 7 6 21 Serial Interface For SIGNAL NAME PIN GPS OBI CLOCK GPS OBI DATA GPS OBI SYNC 71 43 1 44 1 45 1 Use the Main Discrete Outputs Test Page to monitor the following test Figure 5 10 2 Measure at applicable pin Load Resistor to external voltage source such that it will source 25 mA when grounded Note applicable output will sink this current when active LOW HIGH Load source voltage minus 0 2 V Page 5 50 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 6 22 Discrete Switch and Altitude Inputs For INPUT NAME ALTITUDE C4 ALTITUDE C2 ALTITUDE Cl ALTITUDE B4 ALTITUDE B2 ALTITUDE 1 ALTITUDE A4 ALTITUDE A2 ALTITUDE ALTITUDE D4 OBS MODE SELECT CDI SOURCE SELECT DEMO MODE SELECT TEST MODE SELECT 1 Apply alternating loads levels to inputs 2 Monitor the test results via the Main Discrete Inputs Test Page Figure 5 11 3 Verify switching between ACTIVE and INACTIVE loads listed below toggles the corresponding indicator box for each of the input lines listed above PIN 1 61 11 62 11 63 11 64 11 65 11 66 11 67 11 68 11 69 1 70 71 71 11 73 11 75 11 76 1888 Figure 5 11 Main Discrete Inputs Test Page LOAD 375 ohms to ground ACTIVE LOAD gt 100 ohms to ground INACTIVE 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 OK OK Page 5 51 Rev
116. b Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 325 00063 00 Rbn Ca Stp 2mm Ctrs 2x5 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 3 Sub Assy GNS 430 14 28V Gray Unit P N 011 00280 30 Figure 7 1 Part Number Part Name lt 011 00281 04 Sub Assy CDU GNS430 Gray 011 00282 00 Sub Assy Nav Chassis GNC400 011 00283 30 Sub Mn Chassis GNS430 14 28V DO 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 08 LbI S N 14 28V GNS430 Gray 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 325 00063 00 Rbn Ca Stp 2mm Ctrs 2x5 Table 6 4 Sub Assy GNS 430A 28 Black Unit P N 011 00836 00 Figure 7 1 Part Number Part Name Qty 011 00281 00 Sub Assy CDU GNS430 011 00282 00 S
117. b fully counterclockwise but not past the detent OFF position Apply a 10 pV RF signal at 127 000 MHz Monitor the AGC voltage with the DMM DC at J2 2 The DC voltage reading on the DMM is the AGC reference voltage write it down as you will need it for the rest of the test AGC Reference Voltage VDC Adjust the RF level to 20 uV Verify the DMM reading is greater than the AGC reference voltage DMM Reading VDC NLT AGC reference voltage 10 Adjust the signal generator frequency to 127 002778 MHz Page 5 20 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 11 Verify the DMM reading is greater than the reference AGC voltage e 127 002778 MHz _____ VDC NLT AGC reference voltage 126 997222 MHz VDC NLT AGC reference voltage 12 Adjust signal level to 10 mV e 127 00737 MHz NGT reference voltage e 126 99263 MHz _ VDC NGT AGC reference voltage 5 7 2 15 Volume Control Audio Output 1 Enable compression see Paragraph 5 7 2 2 Apply a 100 pV 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 500 ohms Audio Output Measured between J6 16 and 17 NLT 7 07 Vrms 7 Turn the volume control fully counterclockwise not past the detent OFF position 8 Verify a maximum of 22 mVrms Audio Output Measured between J6 16 and 17 NGT 22 mVrms 5 7 2 16 Audio D
118. bly 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 keyboard assembly consists of the snap dome keys photocell and LED s for backlighting display operation The Interface Board is simply an interconnect containing no active components Unit switches and volume pots are mounted in the CDU 1 5 8 Map Board The Map Board is physically connected to the Main Board via P16 The Map Board consists of a map data storage device ROM or flash The map storage device contains base map data used to store topographical information highways lakes rivers and railroads Page 1 6 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 SECTION 2 SPECIAL TOOLS AND TEST EQUIPMENT 2 1 INTRODUCTION This section identifies the special tools and test equipment needed to maintain the 400 Series Units Standard equipment is not listed For any questions regarding special tools and test equipment contact GARMIN at the following address GARMIN 1200 E 151st Street Olathe KS 66062 USA 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 e Test Panel See paragraph 2 3 e Test Cables See paragraph 2 3 e Thinly Ground Open End Wrench for removing COM BNC Chassis Nut on units w
119. by 90 and 150 Hz tones so that the sum of their separate modulation levels is 80 2 The tones shall have the following characteristics a they shall be phase locked in such a manner that their voltage waveforms simultaneously pass through zero in the same direction the maximum simultaneous variation in frequency shall not exceed 0 3 c the total harmonic content of each tone shall not exceed 3 d the RF level shall be 56 dBm and have a frequency within 0 00196 of the assigned carrier frequency unless otherwise specified Page 5 4 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Standard Glideslope Centering Test Signal Standard Glideslope centering test signal is a standard Glideslope test signal in which the difference in depth of modulation of the 90 and 150 Hz signals is less than 0 002 ddm Standard Glideslope Deviation Test Signal Standard Glideslope deviation test signal is a standard Glideslope test signal in which the difference in depth of modulation of the 90 and 150 Hz signals is 0 091 0 002 ddm Standard Glideslope Deflection Standard Glideslope deflection shall be 52 78 center to full scale deflection 150 pA when a standard Glideslope deviation test signal is applied at an RF level of 56 dBm 5 4 3 NAV Receiver 5 4 3 1 Standard Loads Receiver Antenna The NAV receiver antenna J5 shall operate in a 50 ohm load NAV Course Deviation Deflection Load NAV L
120. ce Board 5 to the CDU Bezel 13 7 Back the Flex Assembly 26 out of the Bezel e Remove the Interface Board Figure 7 4 Remove the two Hex Nuts 6 and 31 holding the Rotary Pots 3 and 4 to the Interface Board 5 and slide the Interface Board off the Pot Shafts e Remove the LCD Assembly Figure 7 4 Remove the four screws 2 holding the LCD Assembly 9 to the Bezel 13 e Remove the Inlay Lens and Keyboard PCB Figure 7 4 Remove the five screws 12 and pop the Inlay Lens out and remove the Keyboard PCB 15 from the CDU Bezel 13 4 5 3 Separate the Main and Nav Chassis Figure 7 1 1 Remove two screws 211 60237 10 2 Loosen the rear hinge Special Shoulder Screws 211 00052 00 from the Main Chassis 011 00283 X0 and fold the Nav Chassis 011 00282 00 over To totally separate the chassis remove the threaded Hinge Pins 211 00054 00 from the Nav Chassis using a 050 1 3 mm Hex Driver Tool 3 Disconnect the ribbon cable 325 00063 00 4 Disconnect the fan power leads from the Main Chassis Page 4 4 400 SERIES MAINTENANCE MANUAL Rev P N 190 00140 05 4 5 4 Remove Faulty Boards from the Main Chassis Top Cavity Remove the Top Cover see paragraph 4 5 1 to access the Main Chassis Top Sub assemblies e COM Board Figure 7 2 Steps 5 and 6 apply to 28V 10W units only 14 28V and 28V 16W units have no posistor no brass spacers and use two screws to hold down the PA transistor 1 Remove the Com
121. ctive Boards from the Nav Chassis BO ON os SSS sa Replace the Memory Battery 4 5 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 disassembly of the unit only to the extent required to perform repairs Refer to Sections 6 and 7 for parts lists and illustrations to help in the disassembly of the unit being repaired 4 5 1 Remove the Top Cover Figure 7 1 Remove two screws 211 60234 06 and two screws 211 63234 10 and remove the Top Cover 115 00218 00 shields 253 00062 02 and 253 00062 01 will be removed with the cover 4 5 2 Remove the CDU Assembly Figure 7 1 1 Remove four screws 211 63234 10 2 Disconnect the two flex cables C and D from the Main Board 3 Disconnect wires from the Inverter Board see Figure 7 2 P N 012 00256 00 400 SERIES MAINTENANCE MANUAL Page 4 3 P N 190 00140 05 Rev C 4 5 2 1 Disassemble the CDU Assembly e Remove the Flex Assemblies Figure 7 4 1 Remove the VOL w C and VOL w V Knobs 18 and 19 2 Remove the Push CRSR and Push C V knobs 21 22 20 and 28 3 Remove the Hex Nuts holding the Push CRSR and Push C V shafts to the CDU Bezel 13 4 Disconnect the Flex Assembly 25 from the LCD 9 5 Back the Flex Assembly 25 out of the Bezel 6 Remove the two screws 2 attaching the Interfa
122. d 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 web site at www garmin com using their GARMIN provided user name and password Mod Service Service Purpose of Modification Level Bulletin Bulletin Date Number 1 5 0019 7 2000 14 28V only Comm Transmitter Fuse 2 SB0101 Feb 16 2001 14 28V only Remote COM Transfer 3 SB0203 Feb 1 2002 430 420 14 28V only 10 and 30 Receiver Audio Compressor recommended only if problem exists 4 SB0207 Apr 2 2002 430 420 Remove excessive solder from Comm Board vias Page ii 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev C TABLE OF CONTENTS SECTION 1 DESCRIPTION AND OPERATION Paragraph Page 1 1 INTRODUCTION E aunq dut EIE 1 1 1 1 1 Versions Covered by this Manual qi eerte 1 1 1 2 FUNCTIONAL 1 3 1 2 1 GPS 4001 uu utanakawa E E 1 3 1 2 2 GNG 420 u sled 1 3 1 2 3 GINS u 1 3 tS PAL ee ANG 1 4 La SPECIFICATIONS cic Su 1 4 1 5 GENERAL DESCHRIPT ION u u uuu ae tno ket aasan M usasapa asan asss 1 4 1 5 1 Main 9 e 1 4 1 5 2 Gor Board uu a Sl
123. e 3 5 Static Messages Stored data was lost Replace Main Board see paragraph 4 5 5 Main processor requires service No differential GPS position VLOC remote transfer key stuck Display backlight failure Replace Inverter Board see paragraph 4 5 4 Replace Main Board see paragraph 4 5 5 COM push to talk key stuck Verify that Mic Key Line is not stuck before replacing Com Board Replace Com Board see paragraph 4 5 4 COM has failed Replace Com Board see paragraph 4 5 4 Replace Main Board see paragraph 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 replacing COM Board Replace Com Board see paragraph 4 5 4 GPS is not responding Replace Main Board see paragraph 4 5 5 G S has failed Replace G S Board see paragraph 4 5 6 Replace Main Board see paragraph 4 5 5 G S needs service Replace G S Board see paragraph 4 5 6 GPS stored data was lost Replace Main Board see paragraph 4 5 5 Check unit cooling Check Cooling Fan No basemap data available Replace Map Board see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 Data card write failure Replace Interface Board see paragraph 4 5 2 1 Replace Flex Cable see paragraph 4 5 2 1 Replace Main Board see paragraph 4 5 5 Poor GPS coverage Check Antenna and Cabling Replace GPS Module see paragraph 4 5 5 A
124. epending on wait states when cards are accessed Only one should be low at a time CARD CSRIN CARD CSRON CARD DET RGTN CARD DET LFTN 12V REG CARD CSL3N CARD CSL2N CARD CSLIN CARD CSLON 60 67 CARD DR7 0 Card Data Right Bit 7 0 These pins float except during card accesses 66 POT_BOT_SW Push switch on bottom pot Active low input PWR ON Power on number 1 contact This input is connected to AIRCRAFT POWER through approximately 3000 ohms Powers unit on when connected to ON 2 70 POT TOP WRP I Top Pot Wiper The source is the wiper of a 10 K ohm pot connected to VCC and GND 36 I 37 I pos s 47 CARD_CSR3N Card chips select right 3 0 not Outputs pulses low typically for 48 CARD CSR2N 200 or 260 depending on wait states when cards are accessed 49 KEW 56 57 58 i Page B 8 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 3 7 J16 Table B 9 J16 Descriptions CS_MAPN 1 Chip Select Map Not Output pulses low typically for 240 ns when map is accessed RDN Read Not Output pulses low for typical times of 90 150 and 210 ns depending on wait states WRN Write Not Output pulses low for typical times of 60 120 and 180 ns depending on wait states CCSRON 50 e Card Chip Select Right 0 3 not and Map Chip Select 0 3 Signal N used for both card chips only 1 should be low at a time and selecting CCSR3N MCS3 map N CMA14 CMA23 4
125. eplace GPS Module see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 Replace GPS Module see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 3 11 Table 3 7 Testing Failures COM Board TEST FAILURE TEST PARAGRAPH RECOMMENDED ACTION Power Input Check 5 42 1 Replace Main Board see paragraph 4 5 5 Replace Com Board see paragraph 4 5 4 Frequency Stability and 5 72 3 Replace Com Board see paragraph 4 5 4 Tolerance Demodulated Audio Distortion Receiver Audio Compressor Test Page 3 12 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Table 3 8 Testing Failures NAV Board TEST FAILURE TEST RECOMMENDED ACTION PARAGRAPH Localizer Course Deviation Test 5 7 4 1 Replace Nav Receiver Board see paragraph 4 5 6 To From Deflection Output 5 7 4 2 Replace Nav Receiver Board see paragraph 4 5 6 Characteristic Test To From Deflection Accuracy Test 5 7 4 3 Replace Nav Receiver Board see paragraph 4 5 6 Course Deviation Flag Output 5 7 4 4 Replace Nav Receiver Board see paragraph 4 5 6 Characteristic Test Course Deviation Flag Test Replace Nav Receiver Board see paragraph 4 5 6 VOR LOC Super Flag Output Test Replace Nav Receiver Board see paragraph 4 5 6 Nav Input Lines Replace Nav Receiver Board see paragraph 4 5 6 Nav OBI Outputs Replace Nav Receiver Board see paragraph 4 5 6 Nav Serial DME Outputs Replace Nav Receiver Board see
126. erate with a conventional 50 ohm vertically polarized com antenna The transmitter shall be terminated into a 50 ohm resistive load capable of dissipating a minimum of 50 watts and with a VSWR of not greater than 1 2 1 Audio Load The standard audio load shall be 500 ohms between COMM AUDIO HI J2 7 and COMM AUDIO LO J2 19 400 SERIES MAINTENANCE MANUAL Page 5 3 P N 190 00140 05 Rev C 5 4 1 2 Standard Signals COM RF Level Units All specifications given for the com transceiver are in HARD units To arrive at these units adjust the RF generator to the level specified and insert a 6 dB pad at the output of the RF generator Standard Mic Input Signal A 1000 Hz tone with 275 mVrms into a 500 ohm load 5 4 2 Glideslope 5 4 2 1 Standard Loads Glideslope Receiver Antenna The Glideslope receiver antenna shall operate in 50 ohm load Course Deviation Deflection Load One standard CDI deflection load shall be 1000 ohms Course Deviation Flag Load One standard CDI flag load shall be 1000 ohms To From Load One standard TO FROM load 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 generator provided the signal generator is calibrated into 50 ohms Standard Glideslope Test Signal Standard Glideslope test signal is an RF carrier amplitude modulated simultaneously
127. es VOR LOC receiver sub system status to the Main Board Communicates VOR radial or localizer deviation TO FROM flag state and navigation flag state to the Main Board Drives horizontal deviation flag and TO FROM electrical outputs Receives glideslope data from the Main Board to be sent out in ARINC 429 format Toggles the VOR LOC identifier filter as commanded by the Main Board Communicates to the Main Board the detection of a remote frequency transfer key press 8 Drives electrical outputs for OBI 9 Channels a remote DME if connected to the VOR LOC Receiver Board 10 Transmits ARINC 429 labels 11 Receives ARINC 429 labels 12 Provides signal pass through for G S flags and drivers to NAV Board Connectors 1 5 4 GPS Module The GPS Module contains a twelve channel parallel receiver that is capable of tracking and using up to twelve visible satellites for position velocity and time calculations The GPS Receiver is designed to operate with the GARMIN GA 56 antenna P N 011 00134 00 The GPS Module interfaces with the Main Board via connector J101 400 SERIES MAINTENANCE MANUAL Page 1 5 P N 190 00140 05 Rev C 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 Assem
128. es divided by 100 Standard Localizer Test Signal Standard localizer test signal is an RF carrier amplitude modulated simultaneously by 90 and 150 Hz tones so that the sum of their separate modulation levels is 40 1 The tones shall have the following characteristics a they shall be phase locked in such a manner that their voltage waveforms simultaneously pass through zero in the same direction b the maximum simultaneous variation in frequency shall not exceed 0 3 c the total harmonic content of each tone shall not exceed 3 d the RF level shall be 53 dBm and have a frequency within 0 001 of the assigned carrier frequency unless otherwise specified 400 SERIES MAINTENANCE MANUAL Page 5 7 P N 190 00140 05 Rev C Standard Localizer Centering Test Signal Standard localizer centering test signal is a standard localizer test signal in which the difference in depth of modulation of the 90 and 150 Hz signals is less than 0 001 Standard Localizer Deviation Test Signal 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 voltage of 90 millivolts results Standard Localizer Audio Test Signal Standard localizer audio test signal is a standard localizer test signal to which is added a 1020 Hz signal amplitude modulating the carrier 30 Standard Audio Test Signal
129. ggling the below listed outputs between their active and inactive states causes the output voltage on the appropriate line to switch between low lt 01 V and high gt 8 0 V states Serial DME Clock Low High Serial DME Data Low High 5 7 4 10 NAV Parallel DME Outputs 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 between low lt 1 0 V and high 34 0 V states NOTE The far right digit on the test page represents the 50 kHz output the next digit to the left represents the 100 kHz output and so on the far left digit has no corresponding output PAR DME 50 kHz Low High PAR DME 100 kHz Low High PAR DME 200 kHz Low High PAR DME 400 kHz Low High PAR DME 800 kHz Low High PAR DME 1 MHz Low High 400 SERIES MAINTENANCE MANUAL Page 5 35 P N 190 00140 05 Rev C 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 DME 8 MHz Low High Page 5 36 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 5 Glideslope Final Tests 5 7 5 1 Glideslope Course Deviation Output Characteristic Test 1 Apply a standard course deviation input signal to the unit 2 Measure GLIDESLOPE UP J6 32 with respect to GLID
130. h 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 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 GNC400 Keyboard 1 17 414 00034 11 CDU Front Panel GNC420 Gray 1 18 430 00020 01 Knob Vol w C and Dot 1 21 430 00019 00 Knob Inner w o Decoration 1 22 430 00019 02 Knob Inner w PUSH 1 23 340 00035 00 Snapdome Array GNCAXX 1 25 012 00270 00 Assy Flex Ckt Dsply Kybd 1 26 012 00271 00 Assy Flex Ckt Pot GNC400 1 27 335 00044 10 Skt Strip 2mm RA 4x10 1 37 253 00068 00 Gasket Foam Adh Backed 1 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 27 Sub Assy CDU GNC 420A Black Unit P N 011 00281 01 Figure 7 4 Bub Number Item Description Qty 32 011 00340 00 Sub Assy Inc Dec Push Switch 1 28 430 00013 01 Knob Assy Outer GNC400 500 1 20 430 00013 01 Knob Assy Outer GNC400 500 1 1 011 00340 00 Sub Assy Inc Dec Push Switch 1 2 211 60232 06 Screw 2 56x 187 PHP SS P w NYL 6 3 410 00012 01 Rtry Sw Pot w Mom Push Sw 1 5 012 00258 00 PCB Assy GNC400 Interface Bd 1 31 210 00021 00 Nut Hex Reduced 1 30 211 00030 00 Pivot Pin Power Switch 1 8 117 00028 00 Shaft Pot Machined GNC4XX 1 9 440 00016 0
131. he Glideslope receiver to 335 MHz 2 Apply a 335 MHz signal at a 87dBm level 3 Measure the AGC Voltage and use it as a reference 4 Remove the test signal 5 Apply an undesired image frequency test signal of 245 MHz with a 150 Hz signal amplitude modulated at 30 6 Verify the RF level of the undesired image frequency test signal of 245 MHz shall be greater than 27 dBm to produce an AGC level equal to that of a desired frequency having a level of 87 dBm AGC Reference Voltage should be greater than 27 dBm image AGC voltage Page 5 40 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 5 12 Status Tests 1 The following status bits shall be good with or without a standard glideslope test signal GLIDESLOPE ROM 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 receiver GLIDESLOPE Super Flag OK this can be viewed on the VOR LOC GS CDI test page But the test page must be changed to a different test page then back again to update the flag status 400 SERIES MAINTENANCE MANUAL Page 5 41 P N 190 00140 05 Rev C 5 7 6 Main Board Final Tests GNC 420 versions 011 00506 10 or 011 00506 30 and GNS 430 versions 011 00280 10 or 011 00280 30 must be verified operational with dual power switch in both positions 1 and 2 The A versions of the GNC 420 and the GNS
132. he bezel 10 VLOC SERIAL This is a asynchronous serial output to the Main CPU board from the NAV OUT Board 5 3 J24 Table B 16 J24 Descriptions m 5 G SIFAGC Glideslope board IF AGC output Ean E G S SERIAL IN Serial output to the G S board from Main Board 8 G S SERIAL OUT Serial input from the G S board to the Main Board G S FLAG Input from the G S board G S UP Input from the G S board G S The G S board COMMON or G S input Reference for the G S UP and COMMON G S FLAG G S I G S board superflag input Output on the G S board is an open collector SUPER FLAG output The G S superflag will be active low when the flag is out of view OUT _ 1 2 3 4 5 7 10 11 12 13 14 15 6 14 400 SERIES MAINTENANCE MANUAL Rev P N 190 00140 05 6 GLIDESLOPE BOARD CONNECTORS B 6 1 J25 Table B 17 J25 Descriptions 5 se t d avo oupatimpedance Gis Composite o Noted SSCS GIS SERIAL OUT O Serial output fom G S Board 1o Main Boar GS FLAG O This ouputindiates whether course deviation o O Thin isthe vertical couse deviation ouput forthe GS 1 GS COMMONI O Reference for GIS UP and G S FLAG outs s sm OUT active low when the flag is out of view o _ S
133. igure 7 10 Assy Dwg GPS 400 Dwg No 015 00504 XX Rev G Page 7 23 Page 7 24 blank 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev APPENDIX A GNC 420A AND GNS 430A A 1 DESCRIPTION This appendix describes version A of the GNC 420 and the GNS 430 The A versions contain a 16 watt VHF Com Transmitter as opposed to a 10 watt transmitter There is one Com Board part number for the GNC 420 and GNS 430 A versions which is 012 0061 1 00 A 2 A VERSION UNIT PART NUMBERS 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 16W GNS 430A UNIT P N COLOR OPERATING MINIMUM VOLTAGE XMIT PWR 011 00836 00 BLACK 28 V Only 16 W 011 00836 10 GRAY 28 V Only 16 W TROUBLESHOOTING Follow the procedures in Section 3 to troubleshoot the GNC 420A and GNS 430A The following exceptions are given Table A 1 Unit Main Board Power Supply Maximum Current Unit Main Board Max Current A 27 5 V GNC 420A ON RX 0 99 TX 3 36 GNS 430A ON RX 1 17 TX 3 98 400 SERIES MAINTENANCE MANUAL Page A 1 P N 190 00140 05 Rev C The Com Voltage and Current requirements for the GNS 420A and GNS 430A are listed in Table A 2 Table A 2 Voltage and Current Supply Requirements Connector Pin DC Voltage Tolerance V Max Current DC Conditions J2 P
134. ins 11 amp 12 427 5 4 3 0 Transmit Mode A4 DISASSEMBLY AND ASSEMBLY Disassemble the GNS 430A according to the procedures given in Section 4 5 ALIGNMENT CALIBRATION AND TESTING Perform testing according to the procedures given in Section 5 6 REPLACEABLE PARTS AND ASSEMBLIES See Section 6 for replaceable parts and assemblies A 7 ASSEMBLY DRAWING See Page 7 1 for a list of applicable drawings Page A 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 B 1 This appendix contains tables describing various I O information used in the 400 Series B 2 APPENDIX B CONNECTOR I O DESCRIPTIONS DESCRIPTION Table B 1 I O Descriptions INPUT OUTPUT BI DIRECTIONAL INTERNAL AND EXTERNAL CONNECTORS Table B 2 Internal and External Connections Designation fay m COM GNC 420 AND GNS 12 Aircraft Mounting Rack 430 ONLY J4 Antenna In Out NAV GNS 430 ONLY J6 Aircraft Mounting Rack J5 Antenna In ft GLIDESLOPE J7 GNS 430 J25 Connects Nav and Glideslope ONLY J7 Antenna In KEYBOARD J23 LCD Flex 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page B 1 Rev C Table B 2 Internal and External Connections continued INVERTER BOARD is GPS MODULE ALL UNITS J101 Main Board Antenna In J13 J26 J27 J3 J19 J20 J21 J22 P16 INTERFACE BOARD Data C
135. istortion Test 1 Apply a 10 mV 85 modulated signal 2 Measure the receiver audio distortion Set volume for rated audio 350 Hz lt 25 1000 Hz lt 15 2500 Hz lt 15 400 SERIES MAINTENANCE MANUAL Page 5 21 P N 190 00140 05 Rev C 5 7 2 17 Audio Frequency Response With compression disabled apply a 30 modulated 1 mV signal to the unit Verify the audio output does not change more than 6 dB from 350 Hz to 2 5 kHz Verify the audio frequency response above 2500 Hz decreases and at all frequencies above 4000 Hz it is at least 18 dB below the output obtained at 1000 Hz Measure the audio output in the 25 kHz channel mode 350 2 dB 00 Hz dB 1500Hz dB 2500Hz dB Measure the audio output in the 8 33 kHz channel mode 950 dB 10005 dB 1500Hz dB 2500Hz dB 5 7 2 18 Receiver Audio Compressor Test l Enable compressor 2 Apply 100 1 kHz 20 modulated audio signal 3 Adjustthe power volume control for 7 07 Vrms com audio output 4 Setthe com audio output reference level to 0 dB 5 Adjust the modulation depth to 85 and verify the com audio output level does not vary more than 3 dB 25 to 85 audio variation dB Pages 22 400SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 2 19 Squelch Test Note Opened squelch Audio Closed Squelch No Audio 1 Enable compressor see Section 5 7 2 2 Set the unit and the RF signal generator to 127 000 MH
136. it 2 Tune the unit to 127 000 MHz Vary the signal from 5 to 450mV 3 Set the volume for rated audio 7 07 Vrms 4 Verify the audio output does not vary by more than 6 dB 3uV to 450mV dB 5 7 2 13 Selectivity 25 kHz Mode 1 Tune the unit to 127 000 MHz 2 Turn the modulation OFF on the RF signal generator 3 Turn the power volume control knob fully counterclockwise but not past the detent OFF position 4 Apply a 10 u V RF signal at 127 000 MHz 5 Monitor the AGC voltage with the DMM DC at J2 2 6 The DC voltage reading on the DMM is the AGC reference voltage write it down as you will need it for the rest of the test AGC Reference Voltage VDC 400 SERIES MAINTENANCE MANUAL Page 5 19 P N 190 00140 05 Rev C y 8 9 Adjust the RF level to 20 pV Verify the DMM reading is greater than the AGC reference voltage DMM reading VDC NLT AGC Reference Voltage Adjust the signal generator frequency to 127 008 MHz 10 Verify the DMM reading is greater than the reference AGC voltage 127 008 MHz VDC NLT AGC Reference Voltage 126 992 MHz VDC NLT AGC Reference Voltage 11 Adjust signal level to 10 mV 127 025 MHz VDC NGT AGC Reference Voltage 126 975 MHz VDC NGT AGC Reference Voltage 5 7 2 14 Selectivity 8 33 kHz Mode l 2 Put unit in the 8 33 kHz mode Tune to 127 000 MHz Turn the modulation OFF on the RF Signal Generator Turn the power volume control kno
137. ith serial numbers of approximately 96303300 and lower Jd Figure 2 1 COM Chassis Nut T 3 8 32 UNEF 2 3 TEST PANELS AND CABLES Test panels and cables are to be supplied by the repair facility Load and signal information given in Figures 2 2 through 2 5 and the information listed in Appendix B can help in their fabrication 400 SERIES MAINTENANCE MANUAL Page 2 1 P N 190 00140 05 Rev C This page left intentionally blank Page 2 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 S0 0F 100 061 TVONVW SONVNS LNIVIA 007 9 9874 c c 9894 61 1 19 us Buiweidq peo pue IeuBIS Lr 72 6 4 400 SERIES ALL AIRCRAFT POWER AIRCRAFT POWER AIRCRAFT GROUND AIRCRAFT GROUND LIGHTING BUS HI LIGHTING BUS LO ALTITUDE D4 ALTITUDE 1 ALTITUDE A2 ALTITUDE A4 ALTITUDE B1 ALTITUDE B2 ALTITUDE B4 ALTITUDE 1 ALTITUDE C2 ALTITUDE C4 ALTITUDE COMMON GPS LEFT GPS RIGHT GPS TO GPS FROM GPS LATERAL FLAG GPS LATERAL FLAG GPS LATERAL SUPERFLAG GPS UP GPS DOWN GPS VERTICAL FLAG GPS VERTICAL FLAG GPS VERTICAL SUPERFLAG ANNUNCIATOR C ANNUNCIATOR D ANNUNCIATOR E ALTITUDE ALARM ANNUNCIATE ANNUNCIATOR F POWER INPUT NOT USED ALTITUDE ALARM AUDIO LO GPS OBI CLOCK GPS OBI DATA GPS OBI SYNC GPS ARINC 429 OUT A GPS ARINC 429 OUT B GPS ARINC 429 IN 1 GPS ARINC 429 IN 1B GPS ARINC 429 IN 2 GPS ARINC 429 IN 2 B NOT USED
138. loat except during card accesses Push switch on top pot Active low input Power on number 2 contact Powers unit on when connected to PWR ON 1 Provides Power to top pot CARD DLO 7 POT TOP SW PWR ON 2 CARD WRN Card Write Not Output pulses low typically for 180 ns when cards are accessed POT TOP PWR 400 SERIES MAINTENANCE MANUAL Page B 7 P N 190 00140 05 Rev C Table B 8 J14 Descriptions continued ROT L SMLC ROT L SMLB ROT L SMLA LFT A22 Rotor Left Small A to C are the contacts of a single pole triple throw switch The common of the switch is ground Only one of the 3 is low at a time Push switch on left rotary Active low input Bottom Pot Wiper Card Address 21 Card Address 22 Configured for a test mode enable input from the left data card This input is type I and allows a special down load board that fits into the left slot to put the unit in test mode which then allows writing to the flash An alternate use of this pin is Address 22 for the left data card This may be used in the future to allow for card size expansion If in this mode the pin is type Only one should be low at a time Card detect right not Active low input Insertion of a data card causes this input to be low Card detect left not Active low input Insertion of a data card causes this input to be low Regulated 12 V output Card chips select left 3 0 not Outputs pulses low typically for 200 or 260 d
139. lp in the troubleshooting process a block diagram and external connectors are shown at the end of this section In addition Appendix B describes all of the input output signals for all of the unit s internal and external connectors 1 Fuses Paragraph 3 3 1 2 Power Supply Checks Paragraph 3 3 2 3 Processor Clock Check Paragraph 3 3 3 400 SERIES MAINTENANCE MANUAL Page 3 1 P N 190 00140 05 Rev C 3 3 TROUBLESHOOTING PROCEDURES 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 installing a new fuse F850 5A 0 000000000 n I at d al 000002 00 20 00 F852 2 p D n ae A H S a WE ns P i N 854 Ld 28 ame ae L e 077000000 n 6 Doo 1 un 0000 0700000000 oon T E 07000 504 Bud md _ F853 z E ario O 0 75A 1 55 ma 4 00700 gt n ac oo gag D 5 gt i poc 00 F851 005200 00 8 5 3 00 m 8 0200 00 ou oo n ago oo 0 0 00 0 n z 005200 oo 00 K
140. ltitude input failure Replace Main Board see paragraph 4 5 5 Page 3 8 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 Table 3 5 Static Messages continued COM remote transfer key stuck Verify that Remote Transfer Key Line is not stuck before replacing COM Board Replace Com Board see paragraph 4 5 4 Heading input failure Replace Main Board see paragraph 4 5 5 CDI key stuck Replace 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 6 400 SERIES MAINTENANCE MANUAL Page 3 9 P N 190 00140 05 Rev C 3 5 TESTING FAILURES Another approach in troubleshooting is to perform testing on a unit according to the test procedures given in Section 5 To save time only perform the minimum amount of testing in order to isolate the suspect board Table 3 6 lists recommended actions based on failures that occur during testing Perform the recommended actions in the order given in the table TEST FAILURE Push Button Response Rotary Knobs Map I D Data Card Test Table 3 6 Testing Failures Main Board TEST RECOMMENDED ACTION PARAGRAPH 5 7 6 1 Check Applicable Flex Replace Map Board see paragraph 4 5 5 Replace Main Board see paragraph 4 5 5 5 7 6 2 Check Applicable Flex Replace Rotary Knob see paragraph 4 5 2 1 Replace Main Board see paragraph 4 5 5 5 7 6 3 Replace Map Board
141. mate If the 32 7 MHz signal is present replace the Main Board If the Main Board replacement does not repair the fault replace the GPS Module 3 3 3 2 Internal Clock Check GPS Processor Measure the clock speed of the GPS Processor located on the Main Board Figure 3 5 by placing an oscilloscope probe at 11110 pin 125 The frequency should be approximately 32 7 MHz If the clock is not operational check J8 4 for 32 7 MHz approximate If the 32 7 MHz signal is present replace the Main Board If the Main Board replacement does not repair the fault replace the GPS Module Page 3 6 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 n 00100 2000 000000000 af 00 7 PS oe fs aa Er NZ c3
142. n Hazardous voltages exist on the Inverter Board Figure 7 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 the unit and wait at least six minutes before starting disassembly Death or serious injury could result from electrical shock 4 2 REQUIRED TOOLS Standard shop equipment can be used to remove and replace defective boards The 400 Series lens is coated with a special anti reflective coating which is very sensitive to skin oils waxes and abrasive cleaners CLEANERS CONTAINING AMMONIA WILL HARM THE ANTI REFLECTIVE COATING It is very important to clean the lens using an eyeglass lens cleaner which is specified as safe for anti reflective coatings and a clean lint free cloth 400 SERIES MAINTENANCE MANUAL Page 4 1 P N 190 00140 05 Rev C 4 3 NAV DATA CARD REMOVAL AND INSERTION Before disassembly begins remove the Jeppesen NavData card supplied with the unit The card can be installed or removed when the unit is on or off Insert the card with the swing arm handle at the bottom and the label facing to the left see Figure 4 1 To remove the NavData Card 1 Gently press on the tab using a slight upward motion at the front center of the NavData card This will partially deploy the swing arm handle 2 Rotate the swing arm handle upward and outward until it locks into
143. nd J1 77 78 3 Monitor the Test s results using the Main Analog 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 5 VDC 6 Vary the input amplitude 14 V max and verify the display lighting changes accordingly 7 Cover the photocell and verify the input amplitude 14 V max verify the key lighting changes accordingly 5 7 6 6 Memory Battery Voltage 1 Verify memory battery voltage is OK To convert the displayed value to volts V value x 0 02 The unit typically alarms at 2 46 V 2 The battery voltage for a new battery should be gt 2 9 V 3 Verify V gt 2 68 volts OK 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Page 5 44 Rev C 5 7 6 7 Display Pattern Test Starting from the display pattern test page use the RNG buttons to cycle through all of the display patterns to verify all pixels are driven and color contrast is acceptable OK 5 7 6 8 Fan Test 1 Verify fan blade is not moving or air is not being circulated 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 verify the successful display of the unit configuration GPS 400 GNC 420 or GNS 430 OK 5 7 6 10 GPS Antenna Bias 1 Measure the DC voltage at the GPS antenna connector 2 Verify voltage is 4 9
144. nt system and annunciators Page 1 4 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 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 intended for a communications range of 100 nautical miles The 16 watt transmitters are class 3 and 5 devices as described in RTCA DO 186A indicating that they have channel spacing modes of 25 kHz and 8 33 kHz and are intended for a communications range of 200 nautical miles The receiver is a Class and E device as described in RTCA DO 186A indicating that it has channel spacing modes of 8 33 kHz and 25 kHz with offset carrier capability in 25 kHz mode The Com Board contains connectors J2 and J26 J4 is the Com BNC antenna connector 1 5 3 Nav Board The Nav Board contains the processor 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 VOR or localizer frequency as commanded by the Main Board 2 Communicat
145. o J1 28 output Load 333 ohms three 1000 ohm loads across 11 27 and 1 28 2 Note that full up down 150 mV are also available selections but are not tested MAX UP 300 30 mV e CENTER 0 34 5 mV MAX DOWN 300 430 mV 5 7 6 15 MAIN To From Output Measure J1 25 relative to J1 26 Load 67 ohms Three 200 ohm loads across J1 25 and J1 26 TO 190 340 mV HIDDEN 0 25 mV FROM 190 40 mV 400 SERIES MAINTENANCE MANUAL Page 5 47 P N 190 00140 05 Rev C 5 7 6 16 MAIN Lateral Flag Output Measure J1 23 relative to J1 24 Load 333 ohms Three 1000 ohm loads across J1 23 and 11 24 HIDE 375 480 mV IN VIEW 0 25 mV 5 7 6 17 MAIN Vertical Flag Output Measure J1 29 relative to J1 30 Load 333 ohms Three 1000 ohm loads across J1 29 and J1 30 HIDE 375 80 mV e IN VIEW 0 225 mV 5 7 6 18 MAIN Lateral Super Flag Output 1 Measure at J1 17 Load resistor to ground such that it will 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 be run at 27 5 V 56 ohms 14 W HIDE AIRCRAFT POWER minus 1 5 VDC min IN VIEW 0 25 VDC max 5 7 6 19 MAIN Vertical Super Flag Output 1 Measure at J1 18 Load Resistor to ground such that it will sink 500 mA when attached to AIRCRAFT POWER J1 19 or 20 Note
146. oltage 5 Record this below as the upper 6 dB bandwidth 6 Find lower 6 dB bandwidth and record below Increase RF level by 63 dB to 24 dbM 7 Find upper 69 dbM bandwidth and record below Find lower 69 dbM bandwidth and record below Upper6 dBBW 2110 0165 MHz Lower6dBBW sx109 9835 MHz Upper69dBm BW 110 036 MHz Lower 69 dBm 2109 964 MHz Page 30 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 3 19 Spurious Response VOR LOC 1 Tune the VOR receiver to 117 95 MHz 2 Verify the input signal 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 less than 13 dBm Input Signal Level NLT 13 dBm 3 Repeat the test at a LOC frequency of 111 95 MHz and an undesired image frequency of 71 15 MHz OK 400 SERIES MAINTENANCE MANUAL Page 5 31 P N 190 00140 05 Rev C 5 7 4 Navigation Assembly Tests 5 7 4 1 Localizer Course Deviation Test 1 Display the VOR LOC GS CDI Test Page Figure 5 6 VOR LOC GS CDI CDI FLAG S FLG TO FR LAT Center Hide Hide From vERT Center Hide Hide Figure 5 6 VOR LOC GS CDI Test Page 2 Display the following on the VOR LOC GS CDI Test Page and verify the following voltages measuring across VOR LOC LEFT J6 3 with respect to VOR LOC RIGHT J6 4 Full Right
147. osite 4 x b 5 28 5 7 3 12 VOR Course Deviation 5 29 5 7 3 13 Localizer Course Deviation Sensitivity 5 29 5 7 3 14 TO FROM I dic8atloru coe aora e eio e 5 29 5 7 15 Centering AG60T86y2 ae 5 29 5 7 3 16 Course Deviation Accuracy Test 5 30 5 7 3 17 VOR OBS Bearing Accuracy 5 30 57 3V8 Selectivity oio esi e te e 5 30 5 7 3 19 Spurious Response VOR LOC r 5 31 Page vi 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev C SECTION 5 ALIGNMENT CALIBRATION AND TESTING continued 5 7 4 Navigation Assembly Tests 5 32 5 7 4 1 Localizer Course Deviation Test a 5 32 5 7 4 2 To From Deflection Output Characteristic 5 32 5 7 4 3 To From Deflection Accuracy 5 32 5 7 4 4 Course Deviation Flag Output Characteristic 5 33 5 7 4 5 Course Deviation Flag 5 33 5 7 4 6 VOR LOC Super Flag Output 5 33 NAV Input EGS u u 5 34 5 7 4 8 OBI Oulpuls u ente
148. pacing operation The squelch threshold can be set to any value between zero and 63 25 kHz OK 5 6 1 4 SQ 833 The SQ 833 field sets the squelch threshold for 8 33 kHz channel spacing operation The squelch threshold can be set to any value between zero and 63 The higher the number the more signal is required to break squelch 6 33 kHz OK Page 5 10 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 6 1 5 Sidetone The sidetone audio output level is independent of the COM volume knob on the unit The SIDETN field sets the 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 MIC audio gain The MIC gain can be set to any value between 00 and 63 The higher the number the greater the gain in the mic audio circuit MIC Gain OK
149. paragraph 4 5 6 Nav Parallel DME Outputs Replace Nav Receiver Board see paragraph 4 5 6 Table 3 9 Testing Failures Glideslope TEST FAILURE TEST PARAGRAPH RECOMMENDED ACTION G S Course Deviation Output 5 7 5 1 Replace Glideslope Board see paragraph 4 5 6 Characteristic Test Course Deviation Deflection 57 52 Replace Glideslope Board see paragraph 4 5 6 Accuracy Test Course Deviation Flag Test 5 7 5 3 Replace Glideslope Board see paragraph 4 5 6 G S Superflag Output Test 5 7 5 4 Replace Glideslope Board see paragraph 4 5 6 Receiver Sensitivity 225 9 Replace Glideslope Board see paragraph 4 5 6 Centering Accuracy Replace Glideslope Board see paragraph 4 5 6 Replace Glideslope Board see paragraph 4 5 6 Selectivity Bandwidth Replace Glideslope Board see paragraph 4 5 6 Nose Bandwidth Replace Glideslope Board see paragraph 4 5 6 Skirt Bandwidth Replace Glideslope Board see paragraph 4 5 6 Spurious Response Replace Glideslope Board see paragraph 4 5 6 Status Tests Replace Glideslope Board see paragraph 4 5 6 400 SERIES MAINTENANCE MANUAL Page 3 13 P N 190 00140 05 Rev C Table 3 10 Testing Failures NAV Receiver TEST FAILURE TEST PARAGRAPH RECOMMENDED ACTION Voice Ident Audio Output Level Replace Nav Receiver Board see paragraph 4 5 6 Voice Ident Audio Frequency 5 7 3 2 Replace Nav Receiver Board see paragraph 4 5 6 Response Voice Ident Audio Distortion Replace Nav Receiver Board see paragr
150. place perpendicular to the face of 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 card To insert the NavData card 1 Place the card into the NavData card slot with the label facing to the left and the swing arm handle at the bottom front 2 Press the NavData card into place until it seats on the internal connector and the front of the card is flush with the face of the unit If the swing arm handle is up gently lower the handle and push it into place flush with the face of the unit lt lt F 7 lt Figure 4 1 Nav Data Card Installation and Removal Do not remove the Mylar insulators They prevent the shorting out of boards and board components The insulators may be ordered if damaged See Section 6 Replaceable Parts Page 4 2 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 4 4 UNIT DESIGN Each unit consists of a Main and Nav Chassis CDU Assembly and a Top Cover The Main Chassis has a Top and Underside Cavity which contains replaceable boards The following is a typical order of disassembly Remove the Top Cover Remove the CDU Assembly Disassemble the CDU Assembly Separate the Main and Nav Chassis Remove Defective Boards from the Main Chassis Top Cavity Remove Defective Boards from the Main Chassis Underside Cavity Remove Defe
151. r than 90 Figure 5 5 118 50 MHz 70 90 127 50 MHz 70 90 136 50 MHz 70 90 3 To verify the compressor has a minimum dynamic range of 20 dB input a 2 75 Vrms MIC signal and verify that the modulation percentage does not change more than 0 5 dB from 0 275 Vrms input 127 00 MHz change in dB Page 5 16 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 2 5 Carrier Noise Level 1 Apply standard MIC input signal 2 The demodulated noise on the transmitter output without audio modulation shall be at least 45 dB below the demodulated audio level obtained when the transmitter is modulated with a standard mic input signal 118 50 MHz gt 45 dB 127 50 MHz gt 45 dB 136 50 MHz gt 45 dB 5 7 2 6 Demodulated Audio Distortion 1 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 1000 and 2500 Hz 118 50 MHz lt 10 127 50 MHz lt 10 136 50 MHz lt 10 5 7 2 7 Demodulated Audio Response 1 Adjust the mic input level for 200mV at 1000 Hz This should produce approximately 70 TX modulation 2 Sweep the audio input frequency from 350 to 2500 Hz 3 Verify the frequency response of the audio output does not vary more than 6 dB 127 500 MHz 350 Hz dB 127 500 MHz 1000 Hz dB 127 500 MHz 2500 Hz dB 4
152. s from the Nav Chassis 4 6 4 6 ic T 4 7 4 7 MEMORY BATTERY REPLACEMENT 4 7 4 7 1 Remove the Memory 4 8 Page iv 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Rev C SECTION 5 ALIGNMENT CALIBRATION AND TESTING Paragraph Bal INTRODUCTION haat dues 5 2 RECOMMENDED TEST EQUIPMENT 5 9 TESTSELDIUD uu sth u nn Sum S su a u citum 5 4 STANDARD SIGNALS AND TEST LOADS 5 4 1 VHF Com Transceiver ean eae 5 4 1 1 Standard Loads 5 4 1 2 Standard Signals toe tute 5 4 2 GIGS 5 4 2 1 cU 5 422 Stan fos 5 4 3 NAV lean 5491 Standard od et 5 4 4 VOR Standard 3 u 5 4 4 1 Standard Test Signals 5 4 5 Localizer Standard Signals 5 4 5 1 Standard Test ACON ME N T e 56
153. ssy GPS Module GNC TSOII PCB Assy GNC400 Inverter Bd 70 UJ gt a lt Q 2 O K lt D UJ PCB Assy GPS400 Main Bd DO SMP Conn Cover 25D MP Outer Cvr GPS GNC500 Main Chs s w o Stud GNC400 500 crew 4 40x 187 PHP SS P w NYL Screw 4 40x 437 PHP SS P w NYL crew 4 40x 250 PHP SS BO Scr 4 40x 375 FLHP100 SS P Nyl Insulator w Boss Main GNC400 Insulator Inverter GNC400 Header Bd to Bd 2x6 77 00 e c UJ z O T lt Table 6 32 Main Chassis Assy GPS 400 14 28V DO Unit P N 011 00283 33 Figure 7 9 Part Number 011 00474 01 012 00256 00 012 00296 00 012 00347 02 115 00337 00 115 00354 00 125 00034 01 211 60234 06 211 60234 11 211 60334 08 211 63234 10 231 00020 00 250 00050 01 250 00051 00 334 00039 02 Part Name Sub Assy GPS Module GNC TSOII PCB Assy GNC400 Inverter Bd PCB Assy GPS400 Main Bd DO SMP Conn Cover 25D MP Outer Cvr GPS GNC500 5 e z lt a 2 2 2 mi o 2 2 2 2 2 2 2 Ccrew 4 40x 187 PHP SS P w NYL T B TU I U a UJ z ie U Crew 4 40x 250 PHP SS BO Scr 4 40x 375 FLHP100 SS P Nyl Insulator w Boss Main GNC400 Insulator Inverter GNC400 Header Bd to Bd 2x6
154. t Name lt 011 00474 01 Sub Assy GPS Module GNC TSOII 012 00214 05 PCB Assy Comm 10W 14 28V 012 00256 00 PCB Assy GNC400 Inverter Bd 012 00296 00 PCB Assy GNC400 Map Bd 012 00347 22 PCB Assy GNC420 Main Bd DO 115 00203 00 SMP Cover Cont GNC400 Comm Bd 115 00205 00 SMP Cover Synth GNC400 Comm 115 00207 00 SMP Cover RF GNC400 Comm Bd 115 00354 00 SMP Outer Cvr GPS GNC500 125 00034 01 Main Chs s w o Stud GNC400 500 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 211 60234 11 Screw 4 40x 437 PHP SS P w NYL 211 60334 08 Screw 4 40x 250 PHP SS BO 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 231 10001 00 Cable Tie 4 0 250 00047 00 Insulator Comm Bd GNC400 250 00050 01 Insulator w Boss Main GNC400 250 00051 00 Insulator Inverter GNC400 253 00061 00 Seal EMI GNC400 500 253 00062 03 High Permb Shd 4 x1 Flat 310 00009 08 Cable Coax RG 178B U 6 39 LONG 330 00070 04 Conn Coax Blind Mate Thd Mt 334 00039 01 Header Bd to Bd 2x5 334 00039 02 Header Bd to Bd 2x6 670 00018 00 Xstr Mosfet N Ch Push Pull VHF 42 42 4 po 42 42 42 42 pol ynl oloaim o Aa as aljasfjajasjajyajajya 400 SERIES MAINTENANCE MANUAL P N 190 00140 05 Table 6 22 Main Chassis Assy GNC 420 14
155. ub Assy Nav Chassis GNC400 011 00283 20 Sub Main Chassis GNS430A 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 06 LbI S N GNS430A 28V 16W 161 00422 00 Lbl Prot Bezel Cover Warning 211 00052 01 Screw Shoulder Special Nylon 211 00054 01 Hinge Pin Nylon Locking 211 60234 06 Screw 4 40x 187 PHP SS P w NYL 211 60237 10 Screw 6 32x 375 PHP SS P w NYL 211 63234 10 Scr 4 40x 375 FLHP100 SS P Nyl 253 00062 01 High Permb Shd 4 x6 Flat 253 00062 02 High Permb Shd 4 x2 25 Flat 325 00063 00 Rbn Ca Stp 2mm Ctrs 2x5 400 SERIES MAINTENANCE MANUAL P N 190 000140 05 Page 6 5 Rev C Page 6 6 Rev C Table 6 5 Sub Assy GNS 430A 28V Gray Unit P N 011 00836 10 Figure 7 1 Part Number Part Name Qty 011 00281 04 Sub Assy CDU GNS430 Gray 011 00282 00 Sub Assy Nav Chassis GNC400 011 00283 20 Sub Main Chassis GNS430A 011 00460 40 Sub Assy Memory Card Dummy 115 00218 00 SMP Cover Top Main Chas GNC400 115 00246 00 SMP Hinge GNC400 Front 115 00246 01 SMP Hinge GNC400 Rear 145 00480 02 PMP Bezel Cover GNS430 161 00201 11 LbI S N GNS
156. uo epe t as eeu et Adi 5 19 5 7 2 14 Selectivity 8 33 kHz Mode I a 5 20 5 7 2 15 Volume Control Audio Output a 5 21 5 7 2 15 Audio Distortion TOSL series 5 21 5 7 2 17 Audio Frequency Response u 5 22 5 7 2 18 Receiver Audio Compressor Test a 5 22 5 7 219 Squelehi u tei 5 23 5 7 2 20 Frequency Modulation 5 24 5 7 2 21 Com Remote Transfer o t te eei Ee atra eius 5 24 5 7 3 Navigation Receiver Final Tests 5 25 5 7 3 1 Voice Ident Audio Output Level eee 5 25 5 7 3 2 Voice Ident Audio Frequency Response 5 25 5 7 3 3 Moice ldent Audio Distortion eere e 5 26 MOS MR NOR c 5 26 5 7 3 5 VOR Audio Sensitivity onde danse 5 26 5 7 5 nce t aceite dE 5 27 5 7 3 7 Ident Voice Tone Raltlio 5 27 5 7 3 8 Harmonic Distortion tom tax da 5 27 5 7 9 9 VOR Flag Sehesllivily su u Rust 5 28 5 7 3 10 LOG Flag Sensitivity eoe rota t Ta tais tio eot 5 28 5 7 3 11 VOR LOG Comp
157. ursor is off and rotating the small right knob 2 change data on the displayed configuration page press the small right knob CRSR to turn on the cursor Turn the large right knob to switch between data fields 3 Turn the large or small right knob to change a field that the cursor is on Once you have made the desired selection press the ENT key to accept the entry 400 SERIES MAINTENANCE MANUAL Page 5 9 P N 190 00140 05 Rev C 5 6 1 Com Setup Page Fields 5 6 1 1 Com Frequency The Com Frequency field selects a VHF communication frequency For purposes of setting the squelch sidetone levels and mic gain only the frequencies 118 000 127 000 and 136 975 MHz can be used If any adjustment is made at one of these frequencies it should be made at all three frequencies 5 6 1 2 Frequency Spacing 8 33 kHz channels are not authorized for use in the United States SELECTION DESCRIPTION 25 0 kHz Selects traditional 25 kHz spacing 760 channel 8 33 kHz Selects 8 33 kHz channel spacing which is required in certain areas of the world 5 6 1 3 950 250 For GNS 430 units with serial number 96300200 or lower the operation of the SQ 250 setting is reversed The higher the SQ 250 number the more signal is required to break squelch For units with serial number lower than 96300200 units may contain 03 Com Boards See Section 1 for 28V unit part numbers The SQ 250 field sets the noise squelch threshold for 25 kHz channel s
158. viation of 60 of standard deflection 78 mV x 60 46 8 mV 1 Apply a glideslope standard deviation test signal to the unit 2 Measure GLIDESLOPE UP J6 32 with respect to GLIDESLOPE DOWN GLIDESLOPE Common 26 31 3 Measure at the following GLIDESLOPE LOC frequencies and verify the sensitivity is better than 92 dBm 329 15 MHz 108 95 MHz gt 92 dBm 332 00 MHz 109 30 MHz gt 92 dBm 335 00 MHz 110 30 MHz gt 92 dBm 4 Verify the receiver sensitivity variation is not greater than 3 dB at the three frequencies in step 3 Receiver Sensitivity Variation NGT 3 dB Page 5 38 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 5 6 Centering Accuracy 1 Apply a standard glideslope test signal to the unit 2 Measure GLIDESLOPE UP J6 32 with respect to GLIDESLOPE DOWN GLIDESLOPE Common 26 31 3 Verify the centering accuracy is 0 mV 7 8 mV Centering Accuracy mV 5 7 5 7 AGC 1 Apply a glideslope centering test signal to the unit 2 Measure GLIDESLOPE UP J6 32 with respect to GLIDESLOPE DOWN GLIDESLOPE Common J6 31 to find the course deviation 3 Vary the RF input level between 76 dBm and 33 dBm 4 Verify the course deviation is 0 7 8 mV Course Deviation mV 5 Apply a glideslope deviation test signal to the unit 6 Measure GLIDESLOPE UP with respect to GLIDESLOPE DOWN GLIDESLOPE Common J6 31 to find the course deviation 7 Vary the RF level bet
159. ween 76 dBm and 33 dBm 8 Verify the course deviation is 78 7 8 mV Course Deviation mV 5 7 5 8 Selectivity Bandwidth 1 Apply the glideslope centering test signal at a level of 87 dBm 2 Vary the RF frequency 17 kHz from the assigned channel 3 Measure GLIDESLOPE UP with respect to GLIDESLOPE DOWN GLIDESLOPE Common J6 31 to find the course deviation 4 Verify the course deviation is 0 mV 7 8 mV Course Deviation mV 17 KHz Course Deviation mV 17 KHz 400 SERIES MAINTENANCE MANUAL Page 5 39 P N 190 00140 05 Rev C 5 7 5 9 Nose Bandwidth 1 Apply standard glideslope test signal to the unit 56dBm 2 Find the AGC voltage and use it as a reference 3 Vary the input signal frequency over the range of 17 kHz from the assigned channel frequency 4 Verify the input signal level needed to maintain the AGC reference voltage level does not vary more than 6 dB Input Signal Level Variance lt 6 dB 17 KHz Input Signal Level Variance lt 6 dB 17 KHz 5 7 5 10 Skirt Bandwidth 1 Apply standard glideslope test signal to unit at a signal amplitude of 93dBm 2 Find AGC voltage and use as a reference 3 Increase signal level to 33 dBm 4 Vary selected frequency 132 kHz 5 Verify the AGC voltage is less than the reference AGC voltage from step 2 AGC Reference Voltage dB 132 KHz AGC Skirt Voltage dB 132 KHz 5 7 5 11 Spurious Response 1 Tune t
160. y angle via the Main CDI OBS Config Test Page Figure 5 13 60 60329 1509 150 329 2409 _ 240 229 330 330 429 HAIN CDI OBS CONFIG CDI NAY FLAG TO FROH Lat Center Hidden Hidden vERT Center Hidden SELECTED COURSE 148 Calibrate to 150 CDI OBI SOURCE VERT CDI Track CDI Figure 5 13 Main CDI OBS Configuration Page This completes the testing section Page 5 54 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 SECTION 6 PARTS AND ASSEMBLIES 6 1 INTRODUCTION This section lists major parts of the 400 Series The part numbers listed in this section of the manual are given to aid in assembly and disassembly of the unit only not for identifying orderable parts For orderable part information see the GARMIN Aviation Distributor Service Parts Price List or contact GARMIN directly 6 2 TABLES The following tables contain equipment breakdowns to the assembly level Included in the tables are part numbers that can be used with the corresponding illustrations in Section 7 for ease of P N 190 000140 05 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 3 Sub Assy GNS430 14 28V Gray 011 00280 30 7 1 6 4 Sub Assy GNS430A 28V Black 011 00836 00 7 1 6 5 Sub Assy GNS430A 28V Gray 011 00836 10 7 1 6
161. z 30 modulated with a 1 kHz tone 3 Turn the RF level down below IpV 4 Turn the power volume control on the radio fully clockwise 5 SLOWLY 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 uV 1 5 6 for 8 33 kHz 7 SLOWLY decrease the RF level until the squelch closes no audio 8 Verify the RF level is less than 6 dB below that level which opened the squelch 9 Test squelch at the channels shown below in the 25 kHz channel mode 118 025 MHz 6dB 127 000 MHz 6dB 136 975 MHz 6dB 10 Measure in the 8 33 kHz channel mode 118 030 MHz lt 6 dB 127 005 MHz lt 6 dB 136 980 MHz lt 6 dB 400 SERIES MAINTENANCE MANUAL Page 5 23 P N 190 00140 05 Rev C 5 7 2 20 Frequency Modulation FM deviation is to be measured with an average responding detector which is RMS sine wave calibrated The result 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 1 kHz 118 005 MHz kHz 127 500 MHz kHz 136 500 MHz kHz 5 7 2 21 Com Remote Transfer Input Ground Pin 15 of J2 and verify the status of the XFR box on the Com Setup Test Page changes accordingly OK Page 5 24 400 SERIES MAINTENANCE MANUAL Rev C P N 190 00140 05 5 7 3 Navigation Receiver Final Tests 5 7 3 1 Voice Ident Audio

Garmin GNC 420 GPS Receiver User Manual

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