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Tektronix 1705A instruction manual Theory of Operation

Models: 1705A

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Theory of Operation

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Tektronix 1705A instruction manual Theory of Operation

Contents

1705A Spectrum Monitor SN B040000 and Above 070-8222-08 Table of Contents Installation Table of ContentsTheory of Operation Checks and Adjustments 1705A Spectrum Monitor IiiMaintenance OptionsReplaceable Electrical Parts Replaceable Electrical PartsReplaceable Mechanical Parts 10-1 List of Figures Simulation of a 1705A Full SPAN/DIV displayConsiderations for custom installation of an instrument 1705A Spectrum Monitor ViiList of Tables ViiiGeneral Safety Summary General Safety Summary Service Safety Summary Service Safety Summary Xii Installation PrefaceIntroduction Replaceable Mechanical Parts Contacting Tektronix PrefaceUSA Preface Xvi Introduction Page Typical Configurations Section IntroductionAccessories OptionsIntroduction #73Safety Information Optional AccessoriesSpectrum Display SPAN/DIVFull Power Source Introduction Spectrum DisplayCRT Display Introduction Environmental Characteristics Physical CharacteristicsCertifications and Compliances EMCIntroduction Certifications and Compliances CATMeters Applications SUN Satellite EarthUsing the 1705A for Satellite Communication Band Input Signals Vancouver BC Seattle Portland Helena Boise SAN FranciscoLOS Angeles SAN DiegoZeroing in on a Satellite Tek 12.20 GHZ Horizontal Vertical Polarization Frequency and Number Down Link TransponderLooking at Exciters with the 70 MHz Input GHZMiscellaneous Uses for the 1705A LNB OUT BandSplitter InputOperating Instructions Page Front-panel Controls and Indicators Section Operating InstructionsPosition Power Operating InstructionsFilter Input DisplayVariable control that adjusts the display brightness SPAN/DIVRear- Panel Connectors PositionHolder for the instrument’s mains fuse Spectrum MonitorPowering- up 1400 MHZMeasurement Graticule 1705A graticule scaleReading in dB Voltage Ratio Power Ratio Voltage Ratio Power RatioOperating Instructions DB Reference Reading in dB75Ω 50Ω Operating Instructions DBm to v Conversion Reading in dBmMinimum Maximum Frequency MIDFrequency Scale = 10 Divisions Sweep Length = 12 Divisions Center Frequency Readout 70 MHZMHZ 1400 MHZ Point on Trace That Corresponds to Center Frequency Tuned AT this PointCustomizing Frequency Readout Readout Mode Offset AdjustMain Menu Readout Position12.00 GHZ Basic Operating Procedure Locating Ku- Band SatellitesCity Satcom K2 G-STAR1705A Spectrum Monitor Operating Instructions Page Page Installation Page Section Installation Electrical InstallationMechanical Installation InstallationLNB Power Band Input OFF Cabinet Options250 875105 1301700F02 portable cabinet dimensions CabinetizingCabinet Securing Screws A WFM7F05 with a blank front panel 1700F06 1700F07 1705A Spectrum Monitor Theory of Operation Page Block Diagram Section Theory of OperationOverview Theory of Operation Front Panel Diagram RF Input Diagram If Amplifier Diagram Resolution Filter and Log Detector Sweep Generator Diagram Start Display Deflection Amplifiers Diagram Vertical Deflection Amplifier Microprocessor Diagram Front Panel Diagram LOW Load Average High LoadLow Voltage Power Supply Diagram Pulse Width Modulator Theory of Operation High Voltage Power Supply Diagram Axis Amplifier CRT The pinout for the CRT is shown in Figure Pinout of the CRT Socket 1705A Spectrum MonitorTheory of Operation Checks and Adjustments Page Section Checks And Adjustments Recommended Equipment ListElectrical Instruments Auxiliary Equipment Short-Form Procedure Checks and Adjustments SMA Male-to-bnc Female AdapterPerformance Check 1705A Spectrum Monitor Long Form Procedure Checks and Adjustments Preliminary Control Settings Page Marker Here Marker is +/-- 1 Minor Division from Here Checks and Adjustments 1705A Spectrum Monitor Page Variable Autotransformer L-BAND Input Disregard Marker Here Graticule LineUHF Sine Wave Generator Page End of the Performance Check Procedure Adjustment Procedure Short- Form ProcedurePreliminary Setup Video SPAN/DIV Full Center FrequencyA3 Main BD FrontA1 PWR Sply BD Tek Remove the shorting strap 1705A Spectrum Monitor ShortingStrap 1705A Spectrum Monitor Page 1705A Spectrum Monitor Page 1705A Spectrum Monitor End of Adjustment Procedure Checks and Adjustments Maintenance Page Section Maintenance CleaningSchottky Signal LOW Power SchottCmos ECLTroubleshooting Diagnostic Routines Nonvolatile 2444 RAM Test Reading Data Stored AT 60H to 7F in Processor Error Cannot Read or Write Press Input KEY to Exit Troubleshooting Aids Circuit board assembly locations Major Assembly Interconnection ROW B ROW a PINPower Supply Troubleshooting Procedure Power Supply Fault SymptomsMaintenance Power Supply Fault Symptoms Low Volts SupplyMaintenance Rectifier/Switcher Check High Volts Supply Maintenance High Volts Supply Fault Symptoms Focus Amplifier CheckAxis Amplifier Check Grid Drive CheckHigh Voltage Oscillator Check CRT Voltage CheckCorrective Maintenance Obtaining Replacement PartsMechanical Disassembly/Assembly Maintenance Test Selectable ComponentsBezel Removal Graticule Light Removal and Replacement Removal of the CRT Replacing the CRTRemoval of Front- Panel Assembly Removal of the Rear PanelRemoving the L- Band Tuner Removal Replacement of the Main Board Removal Replacement of the Power Supply Board Removing the LNB Power Supply Board FrontRepackaging 1705A Spectrum Monitor Options Page Field Upgrade Kits Power Cord OptionsPower Cord Options Description of power cord Section OptionsOrdering Replaceable Electrical Parts Page Using the Replaceable Electrical Parts List Section Replaceable Electrical PartsParts Ordering Information Column Descriptions Tektronix Part NoColumn Column 3Spectrum Control INC Weight ST Cross Index MFR. Code Number to ManufacturerAMP INC Fulling Mill Harrisburg PA MSD INC Orange ST DARLINGTON, SCZman & Associates Sobudai Zawa Kanagawa 228 JapanChrome Shibaura Tokyo Japan 2ND Floor NEW Kyoei MINATO-KU Wilhelm WestermanCircuit BD Assypower SUPPLY, 1705A Circuit BD ASSY18V Power SupplyCircuit BD Assyfront Panel Circuit BD Assymain Board ASSY,1705AIAL,MI CAP,FXD,PLSTC100PF,5%,1600VDC/500VACIN,BULK CAP,FXD,CER DI470PF,20%,100V TUBULAR,MILAMP,GLOW135V MAX,1.9MA,C2A-T,WIRE Lead A1DS1A1DS2 A1DS3SQ,TOP Adjustbulk SQ,SIDE ADJUSTT&RRES,FXD,CMPSN1.5M OHM,5%,1W RES,FXD,CMPSN2.2M OHM,5%,0.5WRES,FXD,FILM5K OHM,0.1%,0.2W,TC=T9 IAL,T&R,SMALL BodyREELED,SMALL Body RES,FXDMETAL FILM,100K OHM,1%,0.2W,TC=100SQ,TOP ADJUST,T&R WIRED,1705ARES,THERMAL5 OHM,10%,7A/DEG C RES,FXD,CMPSN2.4K OHM,5%,2WLED ASSYDIR1 Part of A2DS313CA ASSY,SP,ELEC34,26 AWG,5.0 L RES,VAR,PNLCP,20K OHM,20%,0.5W,LINEAR,WBUS,CNDCT PLATE,ELEC Shldcircuit BoardSHIELD,ELECCIRCUIT Board SHIELD,ELEC1705A,BRSCAP,FXD,ELCTLT33UF,+50-20%,35WVDC UVX1H330MAACAP,VAR,CER DI9-45PF,200V CAP,VAR,PLSTC1-3.5PF,500VCAP,FXD,MICA DI98PF,5%,500V A3CR1A3CR2 DIO,SIGFAST RCVRY70V,200MA,100NS,COMA3FL1 FLTR,BANDPASSA3FL2 A3FL3COIL,RFFIXED,45NH COIL,RFFIXED,15NHCOIL,RFFIXED,64UH COIL,RFFIXED,505NHADJUSTT&R GF06UT 2KRES NTWK,FXD,FI10K OHM,20%,9RES GF06UT 5K RES,FXD,FILM115K OHM,1%,0.2W,TC=T0 RES,FXD,FILM237K OHM,1%,0.2W,TC=T0RES,FXD,FILM3.4K OHM,1%,0.2W,TC=T0 RES,FXD,FILM7.5K OHM,1%,0.2W,TC=T0 RES,VAR,NONWWTRMR,250 OHM,20%,0.5W LINRES,FXD,FILM1M OHM.1%,0.2W,TC=T0 PercentCRB20FXE1K62 CRB20FXE9K35RES,FXD,FILM2.1K OHM,1%,0.2W,TC=T0 RES,VAR,NONWWTRMR,100 OHM,20%,0.5W LINRES,FXD,WW6.3K OHM,1%,3W CRB20FXE210EGF06UT 1K RES,FXD,FILM187K OHM,1%,0.2W,TC=T0 Loss 10DB,PKG 7.2MM SQ,6.8MM HIIC,CONVCMOS,A/D8-BIT,32US,SAR,DIFF IN,SER MICROCKT,DGTLMICROCOMPUTER,8 BITIC,MISCCMOS,ANALOG Swquad SPST,100 IC,LINBIPOLAR,AMPLRF AMP,20DBIC,DGTLTTL,BFR/DRVRHEX INV, OC, HI MIXER,FREQ1-500MHZCONN,BOXSHUNT/SHORTINGFEM,STR,1 X 2,0.1 CTR,0.385 H,30 GLD,BLK,JUMPERTAIL,30 GLD IAL,MI,T&RRES,FXD,FILM267K OHM,1%,0.2W,TC=T0 RES,FXD,WW1 OHM,5%,2WOrder by Desc RES,FXD,CMPSN1K OHM,5%,0.50WCONN,HDRPCB/WIREWRAP,MALE,STR,1 X 7,0.15 CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 4,0.150CORE,EMTOROID,FERRITE COIL,RFFIXED,150NHA10SKT1 Controlled 0LUA3CONN,RF Plug CA ASSY,SPReplaceable Electrical Parts Diagrams/Circuit Board Illustrations Page Diagrams/Circuit Board Illustrations SymbolsAssembly Numbers Component ValuesPage 1705A Spectrum Monitor With cross-references to schematic diagrams 1, 2, 3, 4, A3 Main Board Component LocatorA3 Main Board A5 70 MHz Tuner BoardSchematic Diagram 1 Component Locator Chart Local Oscillator 1705A Spectrum Monitor RF InputSchematic Diagram 2 Component Locator Chart Resolution Filter & LOG Detector 1705A Spectrum Monitor If AmplifierSchematic Diagram 3 Component Locator Chart Band Linearity Ramp GeneratorMarker GeneratorSchematic Diagram 4 Component Locator Chart Deflection AmplifierFilter BuffersSchematic Diagram 5 Component Locator Chart 1705A Spectrum Monitor MicroprocessorMicroprocessor TraceSchematic Diagram 6 Component Locator Chart 1705A Spectrum Monitor Front Panel & 18V Supply A2 Front Panel BoardA1 Power Supply Board A1 Power Supply Board Component LocatorSee Parts List for Effective Serial Number Ranges Switcher ErrorLine Rectifier Output FiltersSchematic Diagram 8 Component Locator Chart A10 CRT Socket Board Front of BoardError AMP 1705A Spectrum Monitor High Volts Power SupplyHV OSC Grid DrivePage Replaceable Mechanical Parts Page Using the Replaceable Mechanical Parts List Section Replaceable Mechanical PartsQty Column Replaceable Mechanical PartsThis indicates the quantity of mechanical parts used Indicates actual manufacturer’s part numberPanduit Corp Ridgeland RichcoCHICAGO, IL Nelson Name Plate CO CasitasCircuit BD Assypower Supply See A1 Repl Mounting Parts COVER,HOUSINGALUMINUMFRAME,CRTBEZEL SCREW,MACHINE6-32 X 0.875,PNH,SSTHOUSING,CKT Bdaluminum FRAME,CHASSISSAFETY ControlledSCREW,MACHINE6-32 X 0.188,PNH,STL IN/OUT See A6 Repl Mounting PartsStandard Accessories CLAMP,LOOP0.375 ID,PLASTIC,SAFETY CON TrolledStandard only Optional Accessories CA ASSY,CRTDISCRETE,ANODE LEAD,CRT,1,22A10