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Harris Gates One 994 9202 002, Technical Manual

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Harris Gates One 994 9202 002 Technical Manual Download Page 70

PWA, IPA BOARD - 992 9813 001

Harris PN

Description

QTY UM

Reference Designators (F)

000 0000 003 . . FREQUENCY DETERMINED PART 0.0 EA

JUMPER

254 0002 000 . . WIRE, BUS CU 20AWG . . . . . . . . . . 0.0 FT
336 0264 000 . . PIN SPRING . . . . . . . . . . . . . . . . . . . 2.0 EA

#R011

350 0047 000 . . RIVET, POP .125 X .390L . . . . . . . . 2.0 EA
358 2837 000 . . STUD, PC BD 4-40 X 5/16. . . . . . . . 2.0 EA
358 2838 000 . . STANDOFF 4-40 F/M X .5 LG . . . . . 2.0 EA

#E011 #E012

380 0681 000 . . XSTR IRFP350 ESD . . . . . . . . . . . . 4.0 EA

Q011 Q012 Q013 Q014

386 0412 000 . . ZENER, DUAL 18V 3W ESD . . . . . 4.0 EA

CR001 CR002 CR003 CR004

398 0403 000 . . FUSE, RECTIFIER 3A 250V . . . . . . 2.0 EA

F011 F012

402 0129 000 . . CLIP, 1/4 DIA FUSE . . . . . . . . . . . . . 4.0 EA

XF11A XF11B XF12A XF12B

410 0413 000 . . INSULATOR PAD FOR TO-247. . . . 4.0 EA

#Q011 #Q012 #Q013 #Q014

448 1157 000 . . PANEL FASTENER FOR PCB, 4-40 2.0 EA
494 0345 000 . . CHOKE, RF 1.2 UH . . . . . . . . . . . . . 2.0 EA

L011 L012

508 0538 000 . . CAP .15 UF 400WVDC 5% . . . . . . . 2.0 EA

C012 C014

516 0081 000 . . CAP, DISC .01UF 1KV 20% . . . . . . 2.0 EA

C011 C013

540 1600 008 . . RES 2 OHM 3W 5% . . . . . . . . . . . . . 2.0 EA

R013 R014

540 1600 118 . . RES 51 OHM 3W 5% . . . . . . . . . . . . 1.0 EA

R002

546 0307 000 . . RES 1.3K OHM 13W 5% . . . . . . . . . 1.0 EA

R011

610 0831 000 . . HDR, STR, 8 PIN, RD . . . . . . . . . . . 1.0 EA

J003

614 0909 000 . . TERM STRIP, 3C PCB MODULAR 237 . . 4.0 EA

TB001 TB002 TB003 TB004

620 0515 000 . . RECP, SCREW ON SMC. . . . . . . . . 1.0 EA

J002

843 5400 171 . . SCH, IPA BD. . . . . . . . . . . . . . . . . . . 0.0 EA
843 5400 173 . . PWB, IPA BD . . . . . . . . . . . . . . . . . . 1.0 EA
922 1295 052 . . HEATSINK, MTG TRANSISTOR . . . 1.0 EA
922 1295 053 . . SPACER,. . . . . . . . . . . . . . . . . . . . . . 1.0 EA
939 5695 054 . . TRANSFORMER, TOROID . . . . . . . 2.0 EA

T011 T012

B-4

888-2314-001

Rev. AE 03-05-2002

WARNING: Disconnect primary power prior to servicing.

Summary of Contents for Gates One 994 9202 002

Page 1: ...VE 1 PHASE 994 9204 002 GATES FIVE 3 PHASE 994 9205 002 T M No 888 2314 001 Printed 1990 Copyright 1990 1991 1992 1994 1995 1996 1998 1999 2000 2001 2002 Rev AF 06 21 02 Harris Corporation All rights...

Page 2: ...K LISTs Use the PACKING CHECK LIST to help locate and identify any components or assemblies which are removed for shipping and must be reinstalled Also remove any shipping supports straps and packing...

Page 3: ...K 3 and all of section VI N Feb 1994 38895 Replaced Title Page MRH 1 MRH 2 and pages F 4 F 5 P July 1994 39302 Replaced Title Page MRH 1 MRH 2 and all of section VI R Dec 1994 39223 Replaced Title Pa...

Page 4: ......

Page 5: ...ll of material is equivalent to C1 on the schematic or 2 gives added information or further explanation i e Used for 208V operation only or Used for HT 10LS only etc Inside the individual tables some...

Page 6: ...iv 888 2314 001 Rev X WARNING Disconnect primary power prior to servicing...

Page 7: ...ection Association NFPA standards are recommended as reference Automatic Fire Detectors No 72E Installation Maintenance and Use of Portable Fire Extinguishers No 10 Halogenated Fire Extinguishing Agen...

Page 8: ...vi 888 2314 001 Rev X WARNING Disconnect primary power prior to servicing...

Page 9: ...eep them elevated NOTE If medical help will not be available within an hour and the victim is conscious and not vomiting give him a weak solution of salt and soda 1 level teaspoonful of salt and 1 2 l...

Page 10: ...Output Calibration 3 5 Overload Adjustment Procedures 3 6 Power Supply Current Overload 3 6 Underdrive Fault 3 6 VSWR Detector 3 6 Replacing Boards and Replacing Board Components 3 6 SECTION IV TROUB...

Page 11: ...t A 1 Open Fuse Loss of 20V A 1 RF KILL A 1 Q1 Q2 CR1 A 1 U1 CR4 A 1 U2 A 1 U3 A 1 SECTION B IPA A5 Principles of Operation B 1 IPA Tuning Network B 1 Replacement Alignment B 1 IPA Tuning and Testing...

Page 12: ...ault Detection J 2 Controller Supply Voltages J 2 Replacement Alignment Procedures J 2 PA Voltage Electrical Zero J 2 PA Volt Meter Calibration J 2 Power Supply Current Calibration J 2 Power Output Ca...

Page 13: ...verall pro vides theory of operation of the vari ous sections of the transmitter not covered in later sections Section VI Parts List provides parts list for the transmitter The following sections prov...

Page 14: ...ILITY Greater than 130 positive peak program modulation capability at 1100 watts INCIDENTAL QUADRATURE MODULATION IQM 30 dB typical below 95 modulation of L R channel at 1 kHz AUDIO INPUT Continuously...

Page 15: ...PEAK CAPABILITY Greater than 130 positive peak program modulation capability at 2750 watts INCIDENTAL QUADRATURE MODULA TION IQM 30 dB typical below 95 modulation of L R channel at 1 kHz AUDIO INPUT C...

Page 16: ...ility at 5600 watts INCIDENTAL QUADRATURE MODULA TION IQM 30 dB typical below 95 modulation of L R channel at 1 kHz AUDIO INPUT Continuously adjustable from 10 to 10 dBm transformer less active 600 oh...

Page 17: ...ectly over the components dissi pating heat and exhausts through the output coils and out the top of the transmitter The circuit cards and their heat sinks have been designed to provide a chimney acti...

Page 18: ...a path for the zero sequence currents as well as any har monic currents which are generated due to the rectification of the secondary voltages Today many transformers are supplied with all of the prim...

Page 19: ...ding will help keep stray RF current to a minimum RF interference usually shows up in one of several ways intermittent problems with digital or remote control circuits audio feedback or high pitched n...

Page 20: ...an OFF condi tion and all overload lights lit A standard 9 volt battery will last about 2 weeks of continuous running with no AC powerapplied Alkalinebatterieswillgivethe longest shelf life It is a go...

Page 21: ...connected e Transmitter output is properly termi nated into a suitable load capable of handling rated output power antenna or dummy load f Audio input is properly connected g Monitoring equipment is...

Page 22: ...ing to zero u Compare the present readings against the factory data for any major discrepan cies If any exist it should be investi gated at this time v Progressively step the power level up ward by se...

Page 23: ...n your monitor and change the audio polarity if the need is indicated 2 7 4 Remote Meter Calibration The remote sample outputs of the trans mitter are designed to be compatible with most modern day re...

Page 24: ...volt dc supply PDM Pullup Resistors Shield shown covering 250 watt resistor s used by PDM Pull up circuits Low Voltage Transformer A20T1 Secondary for 20VDC 20VDC 24 VAC and IPA Supply 60 75 90 105 12...

Page 25: ...ial turn on Phase Monitor Detects loss of phase on primary AC input power and has capability to detect low primary AC input voltage 3 phase GATES FIVE only FAN Circuit B r e a k e r s A20CB2 A20CB3 Pr...

Page 26: ...ble 2 7 GATES ONE Typical Readings at 1340kHz Power Output 2500W 2000W 1500W 1000W 500W 200W PA Volts 98 5 90 0 79 0 66 0 50 0 35 0 PA Amps 28 7 26 1 23 0 19 0 14 0 10 0 PDM Level 6 8 6 2 5 5 4 6 3 4...

Page 27: ...0 0 0 0 0 0 VSWR Detector Null Set 5 1 5 1 5 1 5 1 5 1 5 1 Underdrive Set 6 7 6 0 5 3 4 4 3 3 2 5 Supply Current Set 44 8 44 8 44 8 44 8 44 8 44 8 Supply Voltage Set 297 297 297 297 297 297 Battery 9...

Page 28: ...2 12 888 2314 001 Rev AC 2 29 00 WARNING Disconnect primary power prior to servicing...

Page 29: ...ose screws bolts and nuts Do not tighten indiscriminately as fittings that are tightened beyond the pres sure for which they are designed may be damaged or broken CLEAN Clean parts only when inspec ti...

Page 30: ...PRINTED CIRCUIT BOARDS Pre ventive maintenance of printed circuit boards is accomplished by performing the following steps Inspect the printed circuit boards for cracks or breaks Inspect the wiring f...

Page 31: ...Figure 3 1 Cabinet Top Figure 3 2 Output Network Removed from Transmitter Rev AD 888 2314 001 3 3 WARNING Disconnect primary power prior to servicing...

Page 32: ...NY TAPS ON THE TRANSFORMER If the High Voltage reading is too high the transformer primary needs to be changed to a higher setting If the High Voltage reading is too low the transformer primary needs...

Page 33: ...d against an external meter using the follow ing procedure The external meter and its leads must be capable of accurately reading at least 12 amps for a GATES ONE at least 30 amps for a GATES TWO and...

Page 34: ...th 400 Hz at 110 power output 5500 watts for GATES FIVE 2750 watts for a GATES TWO and 1100 watts for a GATES ONE Adjust R143 on the Controller board counterclockwise until the transmitter steps to th...

Page 35: ...t draw by the Controller 4 4 Symptom Green Power Level Status LED s Illuminate but the Primary Contactors Do Not Energize and No Overload LED s Illuminate The contactors normally produce an audi ble c...

Page 36: ...ultimeter to be sure it is at a normal value as indicated on the factory test data sheet This reading should not change un less a change has been made to the overload adjustment Check the actions of t...

Page 37: ...rol Functions Do Not Work 4 8 1 Possible Causes 4 8 1 1 Remote Local Switch Check to see that the REMOTE LOCAL switch on the Controller is in the REMOTE position 4 8 1 2 Remote Control Improperly Wire...

Page 38: ...z noise is actually generated in the trans mitter a bad rectifier is suspected The dominant noise frequency of a single phase full wave rectifiedpowersupply is normally twice the power line frequency...

Page 39: ...ith the PA the PDM filter and the PDM Amplifiers in series The PDM Am plifiers purpose is to switch the PDM Filter inputs to ground at a 60 kHz rate For the sake of understanding a relay could be used...

Page 40: ...Figure 5 1 PDM Flow Diagram 5 2 888 2314 001 Rev T Jan 1996 WARNING Disconnect primary power prior to servicing...

Page 41: ...is connected to the PA modules by the Splitter board which distrib utes the RF drive through a separate multi coax cable to the PA modules The RF is then amplified and modulated on the PA modules The...

Page 42: ...Figure 5 2 PDM Loop 5 4 888 2314 001 Rev T Jan 1996 WARNING Disconnect primary power prior to servicing...

Page 43: ...Figure 5 3 RF Flow Rev T Jan 1996 888 2314 001 5 5 WARNING Disconnect primary power prior to servicing...

Page 44: ...the transformer is cen ter tapped with two MOV s Metal Oxide Varistor across the secondary terminals for transient protection the same as on the high voltage power supply The center tap of the low vo...

Page 45: ...6 Table 6 7 GATES TWO FINAL PARTS 992 8149 002 6 6 Table 6 8 GATES TWO CONV PARTS 992 8159 001 6 7 Table 6 9 GATES FIVE 1PH 994 9204 002 6 8 Table 6 10 BASIC GATES FIVE 1PH 994 9204 001 6 9 Table 6 1...

Page 46: ...2 504 0410 000 CAP 1200PF 6KV 5 291 0 0 EA A21C03 A21C04 504 0411 000 CAP 1600PF 6KV 5 291 0 0 EA A21C03 504 0418 000 CAP 2700 PF 12KV 5 293 0 0 EA A21C01 FREQ DET 504 0419 000 CAP 3300 PF 12KV 5 293...

Page 47: ...6414 001 CRYSTAL SELECTION LIST 0 0 EA A16Y1 OSCIL 1 REQD A17Y1 OSCIL OPTION 1 REQD 992 8146 002 OSCILLATOR PKG 0 0 EA A017 OPTION 994 9202 001 BASIC GATES ONE 1 0 EA 994 9238 001 R BK GATES SERIES 0...

Page 48: ...UF 450V 2 0 EA A19C1 A19C3 614 0720 000 TERM BD 6 TERM 1 0 EA TB001 632 1153 000 AMMETER 0 20ADC 4 5 W 1 0 EA M003 632 1158 000 WATTMETER 0 1500W 4 5 W 1 0 EA M004 813 5002 048 STDOFF 10 32X7 8 1 2 H...

Page 49: ...000 CAP 3900 PF 12KV 5 293 0 0 EA A21C02 FREQ DET 504 0433 000 CAP 3600PF 12KV 5 293 0 0 EA A21C01 A21C02 FREQ DET 504 0434 000 CAP 4000PF 12KV 5 293 0 0 EA A21C01 FREQ DET 504 0435 000 CAP 5600PF 10K...

Page 50: ...ASIC GATES TWO 994 9203 001 Harris PN Description QTY UM Reference Designators B 992 8143 001 BASIC GATES SERIES XMTR 1 0 EA 992 8149 002 GATES TWO FINAL PARTS 1 0 EA 992 8159 001 GATES TWO CONV PARTS...

Page 51: ...A J001 632 1152 000 AMMETER 0 40ADC 4 5 W 1 0 EA M003 632 1156 000 WATTMETER 0 5KW 4 5 W 1 0 EA M004 813 5001 071 STDOFF 10 32 X 1 75 3 8 HEX 1 0 EA 813 5007 026 STDOFF 6 32X1 2 1 4 DIA 1 0 EA 817 091...

Page 52: ...00PF 12KV 5 293 0 0 EA A21C03 A21C04 FREQ DET 504 0417 000 CAP 910PF 20KV 5 293 0 0 EA A21C03 FREQ DET 504 0418 000 CAP 2700 PF 12KV 5 293 0 0 EA A21C03 A21C04 FREQ DET 504 0419 000 CAP 3300 PF 12KV 5...

Page 53: ...A 992 8160 001 GATES FIVE 1PH CONV PARTS 1 0 EA 999 2619 001 HARDWARE LIST BASIC GATES 1 0 EA T GATES FIVE FINAL PARTS 992 8149 003 Harris PN Description QTY UM Reference Designators P 300 1981 000 SC...

Page 54: ...07 026 STDOFF 6 32X1 2 1 4 DIA 1 0 EA 817 0914 260 INSULATOR 1 4 20 X 1 7 L 2 0 EA 817 0914 350 STANDOFF PA GROUND 1 0 EA 822 0981 009 MULTIMETER SW PLT 1 0 EA 829 8305 623 RETAINER CABLE 1 0 EA 839 7...

Page 55: ...A03C40 A03C45 A04C10 A04C15 A04C20 A04C25 A04C30 A04C35 A04C40 A04C45 FREQ DET 504 0258 000 CAP 1000PF 20KV 5 293 0 0 EA A21C03 FREQ DET 504 0353 000 CAP 3000PF 12KV 5 293 0 0 EA A21C02 A21C03 A21C04...

Page 56: ...5 COIL FIXED 45FC 2046 0 0 EA A21L1 943 3777 014 COIL FIXED 13 TURN 0 0 EA A21L1 988 2314 005 DP GATES FIVE 3PH 1 0 EA 989 0088 001 PKG LIST GATES FIVE VERT 0 0 EA 989 0088 002 PKG LIST GATES FIVE HOR...

Page 57: ...17 0914 350 STANDOFF PA GROUND 1 0 EA 822 0981 009 MULTIMETER SW PLT 1 0 EA 829 8305 026 ANGLE DIODE 1 0 EA 829 8305 623 RETAINER CABLE 1 0 EA 839 7920 103 ASSY INSTR MOD COIL 0 0 EA 917 0914 223 XFMR...

Page 58: ...6 0358 000 PILOT LIGHT AMBER 2 0 EA A19DS1 A19DS2 424 0410 000 GROMMET 1 38 MTG DIA 4 0 EA 430 0039 000 FAN TARZAN 230VAC 50 60HZ 2 0 EA A20B1 A20B2 448 0224 000 HANDLE ALUM 2 0 EA 448 0785 000 AIR FI...

Page 59: ...EX 1 0 EA 813 5001 076 STDOFF 10 32X3 3 8 HEX 4 0 EA 813 5001 117 STDOFF 10 32X3 1 4 3 8 HE 6 0 EA 813 5013 068 STDOFF 1 4 20X1 1 RD 1 0 EA 813 5604 008 STUD BRS 6 32 X 13 16 5 0 EA 813 5606 007 STUD...

Page 60: ...0 EA TB002 TB003 917 2244 001 SPACER 1 0 LG 75 DIA 4 0 EA 917 2332 049 INSULATOR 3 8 D X 1 LG 7 0 EA 922 0981 005 DOUBLER PLATE 1 0 EA 922 0981 008 DOUBLER PLATE 1 0 EA 922 0981 024 HINGE 1 0 EA 922...

Page 61: ...6 17 AIRFLOW SENSOR 992 9146 001 Harris PN Description QTY UM Reference Designators J 358 1929 000 JUMPER 1 2 LG 1 8H 1 0 EA CR001 358 2997 000 END PLATE 236 TERM MODULE 1 0 EA TB001 380 0125 000 XSTR...

Page 62: ...843 5400 041 SCH AIRFLOW SENSOR 0 0 EA 843 5400 043 PWB AIRFLOW SENSOR 1 0 EA 843 5400 259 COMPONENT LOCATOR AIR FLOW 0 0 EA 922 1265 003 CABLE A20A1 INTERCONNECT 1 0 EA 999 2834 001 HARDWARE LIST AI...

Page 63: ...1 Symptom No Output Possible causes A 3 1 1 Open Fuse Loss of 20V Check the dc voltage on each side of F1 20 volts should be present anytime AC power is supplied to the transmitter and the low voltag...

Page 64: ...386 0298 000 ZENER 1N5352B 15V ESD 1 0 EA CR001 386 0419 000 ZENER LM236H 2 5V ESD 1 0 EA CR010 398 0019 000 FUSE FAST CART 2A 250V 1 0 EA 402 0129 000 CLIP 1 4 DIA FUSE 2 0 EA XF001A XF001B 404 0267...

Page 65: ...M 1 2W 1 1 0 EA R026 548 2400 266 RES 475 OHM 1 2W 1 1 0 EA R017 548 2400 289 RES 825 OHM 1 2W 1 1 0 EA R010 548 2400 301 RES 1K OHM 1 2W 1 2 0 EA R005 R012 548 2400 326 RES 1 82K OHM 1 2W 1 1 0 EA R0...

Page 66: ...witch S1 Selects Y1 or Y2 crystal 4 20V FUSE A16F1 Protects 20 volt supply from faults within the oscillator 5 Frequency Sample A16J4 Output for optional Frequency Monitor Table A 1 Oscillator Board A...

Page 67: ...fault Refer to the troubleshooting information in Section A covering the RF Oscillator If only one side of the IPA is producing output refer to the ohmmeter test proce dure B 3 0 1 IPA Tuning Adjust A...

Page 68: ...10k scale works quite well The following test applies to all MOS FET s used in the transmitter but is not necessarily applicable to MOSFET s used in other equipment This test will show how a MOSFET ca...

Page 69: ...Table B 1 IPA Board A5 IPA Power Splitter Board A26A1 Controls Indicators Rev AE 03 05 2002 888 2314 001 B 3 WARNING Disconnect primary power prior to servicing...

Page 70: ...LATOR PAD FOR TO 247 4 0 EA Q011 Q012 Q013 Q014 448 1157 000 PANEL FASTENER FOR PCB 4 40 2 0 EA 494 0345 000 CHOKE RF 1 2 UH 2 0 EA L011 L012 508 0538 000 CAP 15 UF 400WVDC 5 2 0 EA C012 C014 516 0081...

Page 71: ...o A1 A1 is connected to the output network Thus the power from each bridge amplifier is summed such that at the end of the power combiner string the transmitter s output power is achieved C 3 Replacin...

Page 72: ...ighten the transistor mounting screw first to no more than 5 inch pounds Tighten the terminal block screws only after the mounting screw has been tightened C 7 Scoping the RF Drive Measuring the RF dr...

Page 73: ...A Current Limiting Fuses These fuses protect other circuitry in the transmitter should a portion of a PA module fail As a result of the fusing scheme used in the transmitter sections of a power amplif...

Page 74: ...ng components such as L14 C10 R11 L13 and R13 are properly soldered and are in good physical condition If any of these components have recently been installed recheck their values To determine if the...

Page 75: ...CAP 15 UF 400WVDC 5 8 0 EA C012 C014 C022 C024 C032 C034 C042 C044 508 0554 000 CAP 3300PF 600WVDC 8 0 EA C018 C019 C028 C029 C038 C039 C048 C049 516 0081 000 CAP DISC 01UF 1KV 20 8 0 EA C011 C013 C02...

Page 76: ...C 6 888 2314 001 Rev AE 03 05 2002 WARNING Disconnect primary power prior to servicing...

Page 77: ...to cold tune the Output Net work Tuning the Output Network should not be attempted in the presence of an RF field on or near the frequency of the trans mitter For example the procedure for set up can...

Page 78: ...rds the ground end of L2 will result in heavier loading of the PA D 2 2 5 L1 Tap L1 sets the reactive component that the PA modules should operate into The PA nor mally sees a negative reactance with...

Page 79: ...description of Output Network tuning in Section D With the Tuning of the Output Network having been verified as good disconnect plug P1 from the Output Monitor and con nect an RF generator tuned to t...

Page 80: ...Figure E 1 Output Monitor Board E 2 888 2314 001 Rev AE 03 05 2002 WARNING Disconnect primary power prior to servicing...

Page 81: ...20 X7R 5 0 EA C001 C002 C003 C004 C005 516 0891 000 CAP 0 100UF 10 50V 1 0 EA C012 540 1600 115 RES 39 OHM 3W 5 2 0 EA R017 R018 540 1600 201 RES 100 OHM 3W 5 8 0 EA R012 R013 R021 R022 R025 R026 R02...

Page 82: ...E 4 888 2314 001 Rev AE 03 05 2002 WARNING Disconnect primary power prior to servicing...

Page 83: ...capacitance of the coaxial cables from the PDM Generator to the PDM Amplifiers The 15 volt power supply starts with an RFI filter L1 and C85 This filterrejects any RF energy that would be coupled in v...

Page 84: ...f U1 F 3 2 2 Triangle Wave Imbalance An imbalance in the triangle waves driving the output comparators will result in the out puts of U9 differing from those of U10 If the DC AUDIO balance is correct...

Page 85: ...he Mul timeter If it is excessively high such as pinned the problem would be on the Con troller in the power level summing circuitry U19 If the PDM Level is okay the problem could be caused by U1 U2 U...

Page 86: ...0 2 0 EA L004 L005 494 0445 000 CHOKE HIGH CURRENT 470UH 2 0 EA L001 L002 500 0759 000 CAP MICA 100PF 500V 5 4 0 EA C005 C010 C013 C015 500 0787 000 CAP MICA 200PF 500V 5 4 0 EA C006 C014 C016 C020 50...

Page 87: ...R108 548 2400 430 RES 20K OHM 1 2W 1 1 0 EA R109 548 2400 458 RES 39 2K OHM 1 2W 1 2 0 EA R105 R110 548 2400 601 RES 1MEG OHM 1 2W 1 5 0 EA R009 R010 R042 R059 R113 550 0949 000 TRIMPOT 100K OHM 1 2W...

Page 88: ...F 6 888 2314 001 Rev AE 03 05 2002 WARNING Disconnect primary power prior to servicing...

Page 89: ...rcuited on the output side of A6A1F1 there will be 0 voltage sent to the Controller through this circuit on J1 pin 7 If PDM Amplifier MOS FET Q19 or Q20 or the associated damper diode is short circuit...

Page 90: ...ter check the drain circuit Remove the PDM pull up board fuses from A6 thru A9 Check the resistance from E8 E9 E10 and E11 of each board to ground Each should measure greater than 700k ohms A low read...

Page 91: ...rent surges on PDM Amp Board A7 F1 A8F1 A8 located at front of transmitter Protects 20 volt supply from over current surges on PDM Amp Board A8 F1 A9F1 A9 located at front of transmitter Protects 20 v...

Page 92: ...ers are immune to this damage The MOSFET transistors are shipped in antistatic packaging The transistors should remain in this packaging until they are to be used or tested G 4 Testing MOSFET s The MO...

Page 93: ...ULATOR PAD FOR TO 247 1 0 EA CR001 494 0395 000 CHOKE 40UH 2 AMP 1 0 EA L001 506 0246 000 CAP 0 47UF 63V 5 1 0 EA C002 516 0032 000 CAP DISC 200 PF 1KV 12 0 EA C023 C024 C043 C044 C046 C047 C048 C049...

Page 94: ...EA 939 7532 001 ASSY PWB PDM PULL UP 1 0 EA 999 2135 001 HARDWARE LIST 1 0 EA PDM PULL UP BOARD 992 5872 006 HARRIS P N DESCRIPTION QTY UM REF SYMBOLS EXPLANATIONS 384 0686 000 DIODE DSR 3400X ESD 2 0...

Page 95: ...A BRASS 12 0 EA J011 J012 J013 J021 J022 J023 J031 J032 J033 J041 J042 J043 817 0914 267 STANDOFF 75X1 INSULATED 8 0 EA L011 L012 L021 L022 L031 L032 L041 L042 817 0914 268 STUD 5 16 18 PHENONIC 8 0 E...

Page 96: ...H 2 888 2314 001 Rev AA 8 18 1999 WARNING Disconnect primary power prior to servicing...

Page 97: ...volts is sent to the Interface board where it is used to drive the circuit which will energize the start contactor At the same time as the start signal is given a PDM kill is applied by a circuit form...

Page 98: ...olation is to reduce the drain on the battery in conditions where the regulated supply is not present The 9 volt battery holds the memory status for the power level settings fine power ad justment and...

Page 99: ...the LOW power control all the way to zero power output Use a clip lead to short across R18 on the Output Monitor board This will cause the VSWR detector to not be nulled when you bring up RF power Gr...

Page 100: ...flop U24 74C74 Underdrive VSWR Ovld flip flop U25 74C74 PDM Kill Timer Auto Cutback flip flop U26 MC14541 PDM Kill Timer U27 74C175 Overload Counter U28 MC14541 Overload Counter Reset Timer U29 LM339...

Page 101: ...3 CR004 CR006 CR007 CR008 CR011 CR014 CR015 CR016 CR017 CR019 CR018 CR020 CR021 CR022 CR023 CR024 CR025 CR026 CR028 CR029 CR030 CR031 CR032 CR033 CR034 CR040 CR041 CR044 CR045 CR048 CR049 CR050 CR052...

Page 102: ...108 R109 R111 R112 R118 R119 R122 R125 R126 R127 R131 R133 R137 R138 R146 R147 548 2400 405 RES 11K OHM 1 2W 1 1 0 EA R008 548 2400 430 RES 20K OHM 1 2W 1 4 0 EA R034 R080 R083 R084 548 2400 442 RES 2...

Page 103: ...a small DC relay or other indicating device K 2 Replacement Alignment There are no adjustments to be made to the Interface board However the board must either have provisions for the standby oscil la...

Page 104: ...K 2 888 2314 001 Rev AE 03 05 2002 WARNING Disconnect primary power prior to servicing...

Page 105: ...Figure K 1 Interface Board Rev AE 03 05 2002 888 2314 001 K 3 WARNING Disconnect primary power prior to servicing...

Page 106: ...00V 1 0 EA C013 516 0453 000 CAP 1UF 100V 20 X7R 12 0 EA C001 C002 C003 C004 C005 C006 C007 C008 C009 C010 C011 C028 522 0391 000 CAP 1000UF 16V 20 1 0 EA C018 540 1357 000 RES NETWORK 1000 OHM 2 1 0...

Page 107: ...n eral maintenance and troubleshooting ofthe GATES Series transmitters 1 An oscilloscope with 15 MHz or higher bandwidth 2 A VOM with an ohmmeter battery voltage between 3 and 18V 3 A low distortion s...

Page 108: ...L 2 888 2314 001 WARNING Disconnect primary power prior to servicing...

Page 109: ...that are near the work surface would have their static charge neutralized before it would cause device damage or degradation Relative humidity in the work area should be maintained as high as practic...

Page 110: ...allow personnel to be attached to hard ground There must always be 1 megohm series resistance 1 2 watt between the person and the ground Don t touch edge connectors of loaded burn in boards or empty b...

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