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Tektronix 494AP service manual O o o a o o o o a O o o o o o o o O o a

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Contents

Tektronix Page Releaseof Copyright O o o o o o o o a o O o o o o o o o oO a o o A a a a a O oO o o o o O a a o o oO o WarrantyO o o o o A a a a A o a o o a o o A o 494A/494APServiceVot.1O o A o o A o o o o o o oO a o o o a o O o o o o o o 494A/494APservice Manuatis divided into two volumesO a O o o CONTENTSGonrO a o o o O a o o oO o o o o o O o tA a o o o a o o O o a o o oO o a o A o o o o o RAM PowersupplyO o o o a o A o494A/94APServiceVot.1 VOLUME2Preselector P3035on theVideoProcessorboard Rejection O o o oO t 494A/494APServlceVol494A/494APServtceVot.1 A o O oO o o Simplifieddigital-to-analog Converter Simplifiedschematicof harmonicmixerBasicblockdiagramof a -rNsynthesizer 494A/494APServlceVotO o a o O a oO o o MtxERSCHARACTERTSTTCS 944/494AP Service VotSpEctFtcATloNs Options 22 WaveguideThis Manual Do Not ServiceAloneO o o o O a oO a o o o Sedon 1 4g4l494Ap Servlce,Vol A o o o oValue. O a O o O o o oSEL 10to 170GHz Mlxer 18to 26.5to 33 to 490U 40 toWM 49OV WM 490E 490WO o A o O o o o ElectricalcharacteristicsO o a o o o o A o o o a +tAF. x BEF + 20 + 4NHz FreouencyrelatedcharacteristicsKHz 300 Hz 30 Hz 3Hz Typically 30 psldivision of pulse tude Characteristic Performance UirementNormal Accuracyand Ldentical Resolution Resolution FrequencySpan/Div OverallRange MinimumSpan/DivFreq Freouency RelatedcharacteristicsE o o 33-s0GHz O o a eO a o s Accuracy Steps 10 dB/divLogMode RF Attenuatol Range Accuracy Dcto 1 GHz Accuracy Normal or Delta ModeReferenceLevel SEt With Data ENTRYpush Buttons DisplayDynamicRange Accuracy100 DBc Delta a Mode provides differentialPerformancq Requirement DecadeTransitionsAmplitude C oA07-100 Externalmixer InputsignalcharacteristicsO o o a O a o eUalrbratorcAL ouT Speclfication- 494Al4g4ApService,VolJ104 ACCESSORy Pin4 Pin5 1stLO OUTPUTpowerTeristics OutputsignalcharacteristicsLine O a o oCS02-50 KHz to 400 MHz power F u l l l i m i t Leads Speclfication- 494A1494APService,Vot.1Temperature Operatingand Humidity CE03-15 kHzto 50 MHzpowerleadsSrDEvtEw O o o o o o o15.05 28.85inches232x 392x 732.gmm O c o A a o o Unpackingand INITIALINSPECT6N 494A1494ApService,VotO a o o o o o a o o A o a o o o O o o A o o o o o o o ConnectingpowerPowerSourceand power Requirements Installation- 494A/494ApServlce,VolO o o o o a o O o a o o o o o o O o o o o o oO o a o o o O o o o o o o o O c o O a o o O o o o o o o o o o o o o o o o o o o Secton 4g4Al494ApServiceVolEouipmentreouired O o o o o o o o o o o o o o o o oO o o o o o Eouipment Reouired O o o o o o o o o o o o o o o o o o o oAccuracy*0.2s dB io LodB/soolttffi LrlrGtrMAX 10DB/ 2ODB PreliminarypreparationO o o o o o o o o o o o PerformanceCheck procedure 4g4Ll4g4ApServiceVolTrME/DrV PerformancecheckprocedureO o a o o a o o o o o o o o o o o o o o o o o o o o a TME/DV Auto Vertcaldtsplay O o o o a o o a o a o o oTIME/DIVAUTO SPAN/DIVCenter Freouencyaccuracycheckpoints O a o o o o oA a o o o A a o o o o o o o a o o o o o a o o o o oVerticaldtsplay O o a o a A a o o o o a o o o O o a o o o o o o a oCheckCenterFrequencyStabilitv Autoresoln onTME/DVAUTO ResolutionbandwidthautoO a o a o a o a a O o a o o o o o o a o o o o o a o o50 Hz 20 ms SPAN/DrVTlmeMarkGenerator MarkerOutput10dB/Dtv O o a a o o o a o a o a a o o a o a o o o oO a o a o Autoresoln ReflevelTimeAccuracy C.**qyegp WithinS%oftherateserecitJi A o o o a o oA o a o o o a A aMinnose CheckResolutionBandwidth and shape FactorO a a o a o a O a o O o a o A oQlglptv to 50Hz, andVERlCnl.drdpr-ry MIN RFATTENdB O o a o a A o o o o o o o o o o O o o o oA o o SPAN/DV7.4 GHz 9,4 c Nro sMAooaetenLowLosscoAxcABLEwrrx sul courEEroid 0 GHzA o o o o o a O o a o o A oO o a a a Narrow Videofilter PEAK/AVERAGE A o a a a o a o o a O o o oNarrowvideofilter TME/DV Auto PEAK/AVERAGE O o a o o o A oTmeidivauto PartO o a PerformanceCheckprocedure- 4g4Al4g4ApServlceVol.1TrME/DtV TestsettingsO a a TIME/DIV Auto VerticalDisplay 21BIDIV NarrowvtdeofilterO o O o a 15.RF attenuato. test equipment setup for 50-60 dB stepWidevideofilter A a a o a oCentebfreouency DisplayDB/Dtv O a a o o o o a o A o o o o oA o a 103 Trr O o aO a a 12sFreorange PerformanceCheck procedure- 4g4A/4g4ApServiceVolResolutionbandwidth 100 kHz Otsplay O aCheckLO Emission -70 dBmor tess Autoresoln18.Test equipmentsetuplor checklngharmonicdistortion PerformanceCheckprocedure- 4g4Al4g4ApServiceVol.1EXT @o@o@g@@Verticaldisplay LIN Triggering INT TIME/OIV PerformanceCheckprocedure- 4g4A/4g4ApServiceVol. lResolutton Bandwtdth 1 MHzTME/DV EXT VertcalDtsplay 2 dB/DtV CheckHORIZOUTPUTSignatLevel RrttlOptioninstruments I3fil l t r lMAX Hold SpanidivDtsplay Tmeidiv Auto PEAK/AVERAGE VerttcalComb Generator Mooule OutputLevel -dBm Var dB Dot Intensity Off Q15oit rilineUll TR5O2Gpibverificationprogram A o o o c5O9OINPUTT$ O o o o o o o a oReturn Return 5OOOREM49XPGPIBVERIFICATION ProgramO a o a o r 1OO1OPRINTSELECTEDDEVICE-CLEAR...SDC 8070INPUT8100PRINT 9040PRTNT10OMSGEOSA o o Onlymode Fail O c16000REM Talkonlymode 16010PAGE 16050PRTNTTALK Jtestng only 16060INPUTMessage ANDRENREMorEJGPIBvERlFlcArtoH Cotapr-erEo JJLrsrEN!TALKTLF OCrnoiness19530REMFAILUREDECISION Handler 19540PRINT!SELECT a UDK O o o o o o o O o o o o o o o19300cosuB19390 GeneratorThisinstrument StancdischargeCan Damage Semiconductor Many Componentsused7lu Adluctment Procedure- 4g4A/4g4ApServtceVotA a o PreparationSelectorswttch O o o o o o o o o o o o o o o o o o o Adjustment Procedure- 494A/494ApServiceVolTIME/DIV MNL O o o o o o o o o o o o o o o o o o o o o o o o oO o o o o o o o o o o o o o o RrqmTIME/DIVAUTO Triggeringfreerun AdJustmantProcedure- 494A/4g4ApServiceVot. .lTest equlpment setup for adiusting the D€flection Amplifier Adiustment Procedure- 4g4Al4g4Ap ServiceVolTriggering EXT Adfustment Procedure- 4g4Ll4g4ApServtceVotO o o o o o o o o o o o o o o o OuFur GarnR1033 nrors AdJustmentProcedure- 494A1494ApService VotO o o o o o o o o o o o o O o o o o o o o o o o o o o o o o o o o o o o o o oO o o o o o o o o o o o o o o o o o o o o o Adjustnent Procedure- 4g4A/4g4ApServtceVotO a o O o o o o o o o o R1012 R102S,R1030 Adjust Log Amptitier=?l RPlo3s-.8@o.@@GPt AdrustmentProcedure 4g4Ll4g4ApServtce VotO o a o o o o o o o a o o o a o Filrcsotocr Adjustment Procedure- 494l4g4Ap ServiceVotA o o o a o o a o o o o o o o o o o o o LNorE-l AdJustmentProcedure- 4g4l4g4Ap Service VotO o o o O a o o o A a o A o O o oO o o o o o o o a O o a o o a o o a a o o o o o o o o o o o o o oTionbandwtdth SETTTNGS2Rcsct Tion BandwidthO o o o o a o o o a o a o o o $o o3 $oO o o o a a O o a o a o aOotHi O o o o O o o o oAi kHr Triggering Auto O a a a a o o o o a o o o o o o o o o o oO a o a o a o o o MIN RF AttenO a o o O o o a o Adjustment procedure 4g4Al4g4ApseMce votFrequencyrange OTi#iO o a To 3.0-7.1 GHz, set AdrustmentProcedure- 4g4A/494ApRplo?2/h R1OS4 FrequencyOt o AdfustrnentProcedure- 4g4A/4g4ApServtceVolA o o o A o o o o o a AdJustnentProcedure- 494A/4g4ApServtceVotRpzoro Lt. a o o a o O a o@@r Snrnasrzen @O o o o o A o o o o Optioninstruments Only AdjustOption0Z VR BandLevetinoRFouT OUr AdrustmentProcedure- 4g4A/4g4ApServlceVot,IO a o a o o o o o Relativesusceptibilityto Staticdischargedamage IntroductionSectfon6 494A/494ApServicc Vot.1 Maintenance- 4g4Al4g4ApServlce Vot 367-028s,00 TroubleshootingAidsMaintenance- 494A1494ApServiceVol Page Troubleshooting Using Theerrormessagedisplay DiagnosticsTUNINGFAILURE- 2NDLO Powersupplyoutof Regulation TPl034 GroundRefer€nce TUNINGFAILURE- 1STLOO a o a o Malntenance- 494A/494ApServlceVolAuxiliary Synthesizer DesiredMixerfreo 1STLO SetnngaccuracyO o o o o o O o o o o o a Offset SET.540.672KHZ Ting Accu Racy 2NDLO ControldiagnosttcaStrobefreq PHASELOCKFAILURE- 1STLOLockdisabled Press Help Enable Pressshifttoexit Enabledpresshelpto DisableShift Pulsestretcher O o a o eMalntenance- 4S4Al4g4ApServtceVol O o a o aTracemodes Maintenance- 494Al4g4fupService Vof Corrective MaintenanceSelectedcomponents 1R1020A46A1Rl015 446A1Rl010 HorAlr HepairTerminal O o o o o a o o o o o o A aSERvIcING TooLs FoRBoARDTffi3.i*,o= MouNTEDcoMPoNENTs Mafntenance- 494l4g4Ap ServtceVot.1O o o O a a Maintenance- 494A/494ApServtceVot.1 Diode Color CodeO o c a o o Replacingassembliesand Subassemblies O o E a o o o c o o A o o a o a o oA30A57-GPIB Interface O o O o o o O o c o o o o aLlrxER Maintenance- 494Al4g4ApServiceVot.1Sr3- ltI O o o o o o o o o o o o o o o a o o o o o Page EAUloNl Main PowerSupplyModule RemovalUpJ @o @@tr\O o a o o o o o o o o o o O o o o o o o o o o o o o o o o MaintenanceadjustmentsO o o o o o o o o o o o o O a o o Malntenance- 494A/494ApServiceVolEouipmentrequiredforreturnlossadjustment Mafntenance- 494A1494ApServtceVot.1 A o o o o o o o o a o O o o o o o a o o oO o a a o o o o O o o o o o o o o o o o a o o O o o o o o o o 829lr/lHzCoaxial Band-passFitterAdjustmentO a a o a o o a a a o a o a o o o O o o o o o o o o o oMaintenance- 494l4g4Ap ServlceVot O a o o O o o o o a o o o o o o o o o o Malntenance- 494A/4g4ApServiceVolO o o o a o o 17.Corect re3ponsetor g29 MHr tlrlrd and fourth resonators O o o o a o oCalibrated100 MHz.with +20 kHz accu O a o oO o o o o o o o a o o O o o o o o o o o o oLr.fry- gllpin . DoNorposinouexy op O o a o oA o o O o o Ffiffi Maintenance- 494A/4g4ApServtce VotO a o a o a o o Maintenance- 4g4Al494ApService Vot.1Mafnfenance- 4g4Ll494ApServtceVot.1 A a o a o o oO a a o o a o o A a o a o o o o o R404OFine TuneRanee Maintenanco- 4g4A/4g4Ap ServlceVolO a o a O a a o o o a o a o oA o o FREOSPAN/DV MAX Capableof measuring0 Ogmit 2 t\,tt-tz O o o a a o oMalntenance- 494A1494ApServtceVol Start Spur AmplttudeFREQSPAN/DIV MAX Autoresoln on O o o o a a oFREQSPAN/DV MAX Timeidv RangeFREQSPAN/DIV MAX Autoresoln Reflevel Minrf AttenF t HhFr $ fMalntenance- 494A/494ApServlce Vol Jdl tt Malntenance- 494A/4g4ApServiceVotA o O o o o a o o a a o Ll,lO o o o a Maintenance- 494A/4g4ApServtceVot.1Settings A aO a AddressBusTest C o o o O o o o oO o o o o a o SwtTcH Maintenance- 494A1494ApServiceVot..t0xxx U302s Yr iffiI Troubleshootingon InstrumentbusMaintenance- 494A/494ApServtceVol Instrument Bus Test O o o o o a o oResponseto ADDRquery DATAinstrumentbus data command ADDRinstrumentbusaddresscommandInstrumentBusRegisters CombinedADDRcommandand DATAcommandMalntenance- 494Alttg4ApService Vol DATAinstrumentbus dataqueryDB3-DBO X x x 0 0 X x x 0 1 X x x 1 0Instrumentbusregisters DB7-DBOO a o A e Rfinput DBO DB5-DBOExtmixer DB7-O DB3-DBO O o o a aDB2 DB2-DBO VcoLSB DB6 DB2 DBOFront-PanelRegisters OFF Maintenance 4g4ful4g4ApService VolTapedatatransferprogram Finished O o o aE o A o o o A o o o a o oO o o o a o O t aO o o O o o o a O o t O o o a a o O o a a o o o a o a o o o o a o o O o o o O o o a o o o o a o o o o o o o o A o o Rollow Secton 494A1494Ap Service,VotPr signals. Blockdiagrams Showingmore O o o o O a o o a o o o o o o o o o a o o O o o o o o Page O o o o o o o o o o RF InterfaceCircuits Diagram28Lst ConverterDiagram12 RF Input TheRFINPUT50 connectoracceptstheinputsigAndpassesdtttreiueniy oro O o o o o o o o o o o o o O o o o o a o o o o o o a oPage 2NDCONVERTERIF Selection O o o o o o O o o o o o oTheoryof Operafon 4g4A/494ApServlce,Vot Tabte7-1CAvrrYPosr+l+ 2472MHz2ND CONVERTERDiagram12O o o O o o a o o o o o o o o O o o a o o o o o o o o o o oExternalCabtes Theory of Operaton 4g4A/4g4ApService, Vol. .lOu-Too---l PrecisionO o o o O o a o o o o O a o O a o o 2182MHz PHASELOCKED2nd LO Diagrams13O a o O o O o o o Vco O a o a o o o o o o o o a o o a o oO a O o a o MHz 2nd Converter Diagrams15O o o o o o o a o o o a o o o A o a oO o a a o o o 829MHz2nd Conv SwitchandamplifierA o a o o o o o o OtrO o a a a o o o O o o a Page O o a a o o o o o O o a a o o a o o oA o o a 110MHztF AMpLtFtERDiagram17Theory of Operation 4g4Al4g4ApService,Vol A o o o o o o 110MHzFTLTERS Diagram173rd CONVERTERDiagram17 A o o o O o o o O a oO o o O o a o O a o REFERENCELOCKDiagramS0O o A o o o o o o a Bandwidthselection VariabfeResolution Diagrams19, 19,104Id,andA o o o o o O o o A a o o o o O o O o o GalnRequired BandLevetingCircuitDiagram20A o o O o Fn9 input signat.at a nominal14 dBm, is applied LOc AMp and Detector Diagram22316 684 O a o o a316 0316O o o Theory of Operation- 4gA/494Ap Servtce,Vol A a o oTheoryof Operation- 4g4ful4g4ApServtce,Vot VIDEOAMpLtFtERDiagram23Functionaldescrtption 12. Selecdon ol display positlon on lhe log scale Theory of Operaton 494l4g4Ap Servlce,VolVtDEo PROCESSORDAGRAM24 Ffi rffi Theory of Operaton 4g4Al4g4ApService,VolO o DB2 DB3 C3026C2016 FiltercomponentcombinationsSytemis desisncto opn IT,r-.,.P.,9? DlclTAL STORAGEDiagrams25O o Theory of Operadon- 4g4N4g4Ap Servtce,Vot.l LI lPage O o O a o o O o o o o Theoryof Operafon 494A/4g4ApServlce,Vol O o o o o o a o o oO o a a A o a a o o O o eClisplayappearsas a bright dot sweepingacross DEFLECTIONAMpLtFtERSDiagram27500 digitalstoragesweep positions. The resulting Axisand RF Interface DTAGRAM28 O a o o O o oMHztF high Stateor F829 MHzlF towstate Enables CurrentdriversTransferswitchdriver O o O o o a o o A o O o o o o o o o O a aHTGH,VOLTAGESUPPLYDAGRAM29 O o A o O o o o O o a oGEN RUNNTNGflip-flopunassertsR/o oFF throughoR O o o o o O o o o o o oCRT READOUTDAGRAM30 Lf BLANKMSBof the characterdatais not set,theTheory of Operatlon 4g4A/4g4Ap Service, Vol OFFTME u1055-d Theory of Operation- 4g4Ll4g4ApService,Vot. lO o o o o o o o o o o o o o o o o o o o o o o o o o o o Zo-cou I lF-€X . o o o o o X x x x x xX x o o o o o X o o o o oTheory of Operation- 4g4l4g4Ap Servlce,Vol O o o o o o o o o o o o o o o o o o o o o o o o o o o o o\i o Oe oAddress of Ascii code Skip bit Blank character 58O Theory of Opera$on- 494l4g4Ap Servtce,Vol O o o a o o o o a O o o o o o o o O o aA o o o a o o o o o O a o o o o o a o o SWEEPDiagram31Theory of Operaton 494A/494ApService,Vol D4 D3 D2 D1 do A o o O a O a o o o o o o o o20ssldiv 100 TriggerMode Freerun Internal Ext€rnal Line TableZ-13 Theory of Operation- 494A/494ApService,Vol Tabte7-12O a o o a o o o a o o o o o TriggerselectionmodesO a a o a o A o a o o o oA o a o A a o o o o a o o o o o O o o o o O a A o o o o o o A o A o o A o o o o a o o SPANATTENUATORDiagram32Calibrationcontrolselectioncodes Theory ol Operaton 4g4A/494ApService,Vot20k X0.01 1st LO DRTVERDiagram33O o o o a a a o o A o o a a a Xl K3065 x0.1 K3075 x0.01 K4072DB7 O o a o o o o o O a a o a O o o o o o o o o o aDB4 O o a a o o o A o Preselectordriver Diagram34A o Span Volts Span Volts O o a o a o a oO o a o o o o o U5031OUTPUTLINESPreselector Freouencybands Theory of Opera0on- 4g4\l4g4Ap Servlce,VotTabteT-18 A o a o o o o Centerfreouencycontrol DIAGRAM35O o A a a a o O o o Figure Z-2S. DAC Varlance graph O o a O o oTheory of Operaton 494l4g4Ap Servlce,Vot O o O a o o A oRuooeour ADDRESS70 Formats O o o a oC o a o O o o o o o o o O o a o o o a oFunctionaldescription Theory of Operation- 4g4ful4g4ApService,VotO o o O a a HARMONICMIXERDiagram36 Theory of OperaUon- 494Al4g4ApServtce,Vot.1 AUXILIARYSYNTHESZERDiagram37O a a A o o O o o o o O a o o o o o a A o Theoryof Operation- 4g4A/494ApService,VolPage COUNTERBOARDDiagram38 Phaselocksynthesizer Diagrams39 O o o o o e O e o o o o o o o o o o oO o o a U2025OUTPUTLINES O e o o a o o o o o o o o o Page Theory of Operation- 494l4g4Ap Service,Vot DIGITALCONTROLDiagram930. System memory map Theory of Operation- 4g4Ll4g4ApServlce,Vol31. UOaddr€ssspace Theoryof Operation- 494A/494ApServlce,VolO o c o Theory of Operation- 4g4hl4g4ApService,VolPage Bit A a O o O o o o o o o a oPollbits O o a o o o o o A o A a oLunr A a O o o o oFf nsrrrcrr qrs crccr O a o O a o o o o o o A a O a o o O o o o O o o a o A o o O a oO o o o o o o o a o o o o o o o o 100 O o o o o o o o o a o o101 102 CoLTheory of Operation- 4g4A/494ApServlce,Vol Main power Supplyfurnishes all the regulatedO o o o a o O o o o o o o 103Theory of Operaton 494A/494ApServtce,Vot O a o o o o o o o a o o o o oO o o o A o o o o o Oenanon*l 105Theory of Operation- 494l4g4Ap Servlce,Vot 106 +5 V Voltage ReferenceSupply Theory of Operation 4g4Ll4g4ApService, VotDeterminingcomponents 107 O o o o o O a a o a o o a a a o o o a oPage Swtss Opl ONsRcV/134 CalibratorOutput cALOUT O a o o o o o o o o o O o o O o o oA o o o o o o o Freouency O a o o a o o o o o o o a o o o o o o oO a o O o o o o o o o o o o o OoultnGffi O o o o a o o o A o A aGoesanoffi SymmetryA o o a o o Vtdeoimarker A o o o o a a o o o a o o o oGeneralterms Amplitudeterms Gfoesary- 494l4g4Ap Service,VolO o o o o o FrequencytermsDigitalstorageterms A o a o oO a a o o a O o o o o O o a o o oManual Part No G556O-00 Flrst prtnilng JAN1987 Revleed RevisioninformationO o a a o a o o o o o o a o o Instrument O o o o a o12s SENSmVTYO o Efr/sN O o a o o A o a oO o o A o a o o O o o o o o o O o O o o o Chg. Ref M63911 Product see llst Dale2-22-88Productsee llst DeflectionAmplifiertestpointsandadjustments Page5 olO a o o o o o o o o Instrument Manual Performance CheckprocedureO o o o o O o a A o o o O o O a a ADD Instbument PartnoO o o o o O o o o a Date 5/u9o Perfrmanceheck pRocEDURE change stepr r as foltowsProduct494N4g4Ap ServiceVol O a o o o Product494N494Ap ServiceVot.1O a o o o o Date 6/1190Peaiaverage RHILO0 Vehticaldisplay+ \ +i\DB Bandwidth Limits 60dB Measured Resolution Verncal Freouency Bandwidth Display SpaivdivMHz DB Bandwidth MHz 10dB 100kHzNarrow Videofilter TIME/DIV Auto Peaivaverage ResolutionbandwdithParti Minnoise VerticaldisplayPeavaverage A a aCheck1 dB Compressionpoint SpecificationTercfgnix CHANcE INFoRMAnoN PerformanceVerificationRef. C1-991 FREQUENCYSPAN/DIV 1 MHz RESOLUTIONBANDWTDTH1 MHzProduct SeeLlst Date11 SpectrumAnalyzerUnder TestA o a o o O c

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