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Tektronix 1705A instruction manual Checks and Adjustments

Models: 1705A

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Checks and Adjustments

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Tektronix 1705A instruction manual Checks and Adjustments

Contents

1705A Spectrum Monitor SN B040000 and Above 070-8222-08 Table of Contents Table of Contents InstallationTheory 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 Preface InstallationIntroduction Replaceable Mechanical Parts Preface Contacting TektronixUSA Preface Xvi Introduction Page Typical Configurations Section IntroductionIntroduction AccessoriesOptions #73Safety Information Optional AccessoriesSPAN/DIV Spectrum DisplayFull Introduction Spectrum Display Power SourceCRT Display Certifications and Compliances Introduction Environmental CharacteristicsPhysical Characteristics EMCIntroduction Certifications and Compliances CATMeters Applications SUN Satellite EarthUsing the 1705A for Satellite Communication LOS Angeles Band Input SignalsVancouver BC Seattle Portland Helena Boise SAN Francisco 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 Splitter LNB OUTBand InputOperating Instructions Page Front-panel Controls and Indicators Section Operating InstructionsFilter Input Position PowerOperating Instructions 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 scaleOperating Instructions DB Reference Reading in dB Voltage Ratio Power RatioVoltage Ratio Power Ratio Reading in dB75Ω 50Ω Operating Instructions DBm to v Conversion Reading in dBmMID Minimum Maximum FrequencyFrequency Scale = 10 Divisions Sweep Length = 12 Divisions 70 MHZ Center Frequency ReadoutMHZ 1400 MHZ Point on Trace That Corresponds to Center Frequency Tuned AT this PointCustomizing Frequency Readout Main Menu Readout ModeOffset Adjust 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 InstallationLNB Power Band Input OFF Mechanical InstallationInstallation Cabinet Options105 250875 1301700F02 portable cabinet dimensions CabinetizingCabinet Securing Screws A WFM7F05 with a blank front panel 1700F06 1700F07 1705A Spectrum Monitor Theory of Operation Page Section Theory of Operation Block DiagramOverview 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 Recommended Equipment List Section Checks And AdjustmentsElectrical Instruments Auxiliary Equipment Checks and Adjustments SMA Male-to-bnc Female Adapter Short-Form ProcedurePerformance 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 FrequencyFront A3 Main BDA1 PWR Sply BD Tek Shorting Remove the shorting strap 1705A Spectrum MonitorStrap 1705A Spectrum Monitor Page 1705A Spectrum Monitor Page 1705A Spectrum Monitor End of Adjustment Procedure Checks and Adjustments Maintenance Page Section Maintenance CleaningCmos Schottky SignalLOW Power Schott 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 Axis Amplifier Check Maintenance High Volts Supply Fault SymptomsFocus Amplifier Check Grid Drive CheckHigh Voltage Oscillator Check CRT Voltage CheckCorrective Maintenance Obtaining Replacement PartsMaintenance Test Selectable Components Mechanical Disassembly/AssemblyBezel 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 Power Cord Options Description of power cord Field Upgrade KitsPower Cord Options Section OptionsOrdering Replaceable Electrical Parts Page Section Replaceable Electrical Parts Using the Replaceable Electrical Parts ListParts Ordering Information Column Column DescriptionsTektronix Part No Column 3AMP INC Fulling Mill Harrisburg PA Spectrum Control INC Weight STCross Index MFR. Code Number to Manufacturer MSD INC Orange ST DARLINGTON, SCChrome Shibaura Tokyo Japan 2ND Floor NEW Kyoei MINATO-KU Zman & AssociatesSobudai Zawa Kanagawa 228 Japan Wilhelm WestermanCircuit BD Assyfront Panel Circuit BD Assypower SUPPLY, 1705ACircuit BD ASSY18V Power Supply Circuit BD Assymain Board ASSY,1705AIN,BULK IAL,MICAP,FXD,PLSTC100PF,5%,1600VDC/500VAC CAP,FXD,CER DI470PF,20%,100V TUBULAR,MIA1DS2 LAMP,GLOW135V MAX,1.9MA,C2A-T,WIRE LeadA1DS1 A1DS3RES,FXD,CMPSN1.5M OHM,5%,1W SQ,TOP AdjustbulkSQ,SIDE ADJUSTT&R RES,FXD,CMPSN2.2M OHM,5%,0.5WREELED,SMALL Body RES,FXD,FILM5K OHM,0.1%,0.2W,TC=T9IAL,T&R,SMALL Body RES,FXDMETAL FILM,100K OHM,1%,0.2W,TC=100RES,THERMAL5 OHM,10%,7A/DEG C SQ,TOP ADJUST,T&RWIRED,1705A RES,FXD,CMPSN2.4K OHM,5%,2WCA ASSY,SP,ELEC34,26 AWG,5.0 L LED ASSYDIR1Part of A2DS313 RES,VAR,PNLCP,20K OHM,20%,0.5W,LINEAR,WSHIELD,ELECCIRCUIT Board BUS,CNDCTPLATE,ELEC Shldcircuit Board SHIELD,ELEC1705A,BRSCAP,VAR,CER DI9-45PF,200V CAP,FXD,ELCTLT33UF,+50-20%,35WVDCUVX1H330MAA CAP,VAR,PLSTC1-3.5PF,500VA3CR2 CAP,FXD,MICA DI98PF,5%,500VA3CR1 DIO,SIGFAST RCVRY70V,200MA,100NS,COMA3FL2 A3FL1FLTR,BANDPASS A3FL3COIL,RFFIXED,64UH COIL,RFFIXED,45NHCOIL,RFFIXED,15NH COIL,RFFIXED,505NHGF06UT 2K ADJUSTT&RRES NTWK,FXD,FI10K OHM,20%,9RES GF06UT 5K RES,FXD,FILM237K OHM,1%,0.2W,TC=T0 RES,FXD,FILM115K 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 LINCRB20FXE1K62 RES,FXD,FILM1M OHM.1%,0.2W,TC=T0Percent CRB20FXE9K35RES,FXD,WW6.3K OHM,1%,3W RES,FXD,FILM2.1K OHM,1%,0.2W,TC=T0RES,VAR,NONWWTRMR,100 OHM,20%,0.5W LIN CRB20FXE210EGF06UT 1K IC,CONVCMOS,A/D8-BIT,32US,SAR,DIFF IN,SER RES,FXD,FILM187K OHM,1%,0.2W,TC=T0Loss 10DB,PKG 7.2MM SQ,6.8MM HI MICROCKT,DGTLMICROCOMPUTER,8 BITIC,DGTLTTL,BFR/DRVRHEX INV, OC, HI IC,MISCCMOS,ANALOG Swquad SPST,100IC,LINBIPOLAR,AMPLRF AMP,20DB MIXER,FREQ1-500MHZTAIL,30 GLD CONN,BOXSHUNT/SHORTINGFEM,STR,1 X 2,0.1CTR,0.385 H,30 GLD,BLK,JUMPER IAL,MI,T&ROrder by Desc RES,FXD,FILM267K OHM,1%,0.2W,TC=T0RES,FXD,WW1 OHM,5%,2W RES,FXD,CMPSN1K OHM,5%,0.50WCORE,EMTOROID,FERRITE CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 7,0.15CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 4,0.150 COIL,RFFIXED,150NHCONN,RF Plug A10SKT1Controlled 0LUA3 CA ASSY,SPReplaceable Electrical Parts Diagrams/Circuit Board Illustrations Page Assembly Numbers Diagrams/Circuit Board IllustrationsSymbols 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 Marker Band LinearityRamp Generator GeneratorSchematic Diagram 4 Component Locator Chart Filter DeflectionAmplifier BuffersSchematic Diagram 5 Component Locator Chart Microprocessor 1705A Spectrum MonitorMicroprocessor TraceSchematic Diagram 6 Component Locator Chart 1705A Spectrum Monitor Front Panel & 18V Supply A2 Front Panel BoardA1 Power Supply Board Component Locator A1 Power Supply BoardSee Parts List for Effective Serial Number Ranges Line Rectifier SwitcherError Output FiltersSchematic Diagram 8 Component Locator Chart A10 CRT Socket Board Front of BoardHV OSC Error AMP1705A Spectrum Monitor High Volts Power Supply Grid DrivePage Replaceable Mechanical Parts Page Using the Replaceable Mechanical Parts List Section Replaceable Mechanical PartsThis indicates the quantity of mechanical parts used Qty ColumnReplaceable Mechanical Parts Indicates actual manufacturer’s part numberCHICAGO, IL Panduit Corp RidgelandRichco Nelson Name Plate CO CasitasFRAME,CRTBEZEL Circuit BD Assypower Supply See A1 Repl Mounting PartsCOVER,HOUSINGALUMINUM SCREW,MACHINE6-32 X 0.875,PNH,SSTSCREW,MACHINE6-32 X 0.188,PNH,STL HOUSING,CKT BdaluminumFRAME,CHASSISSAFETY Controlled IN/OUT See A6 Repl Mounting PartsStandard only Optional Accessories Standard AccessoriesCLAMP,LOOP0.375 ID,PLASTIC,SAFETY CON Trolled CA ASSY,CRTDISCRETE,ANODE LEAD,CRT,1,22A10