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Tektronix 494AP service manual O o o o o o o o a o O o o o o o o o o, Releaseof Copyright

Contents

Tektronix Page Releaseof Copyright O o o o o o o o a o O o o o o o o o o O a o o A a a a a O oO o o o o O a a o o o Warranty O o o o oO o A a a a A o a o o a o o 494A/494APServiceVot.1 O oA o A o o o o o o o O a o o o a oA o o 494A/494APservice Manuatis divided into two volumes O aO o o o o o o O o o CONTENTSGonr O a o o o O a o o o O o o o o o O o tA a o o o a o o O o a o o o O o a o A o o o o o RAM PowersupplyO o o o a o A o 494A/94APServiceVot.1 VOLUME2 Preselector P3035on theVideoProcessorboard Rejection O o o oO t 494A/494APServlceVol A o O o O o o494A/494APServtceVot.1 Simplifieddigital-to-analog Converter Simplifiedschematicof harmonicmixerBasicblockdiagramof a -rNsynthesizer 494A/494APServlceVot O a o O o oO o a o MtxERSCHARACTERTSTTCS 944/494AP Service VotSpEctFtcATloNs Options 22 Waveguide This Manual Do Not ServiceAloneO o o o O a o O a o o o Sedon 1 4g4l494Ap Servlce,Vol A o o o o O a O o O o o o SELValue. 10to 170GHz Mlxer 18to 26.5to 33 to 490U 40 toWM 49OV WM 490E 490W O o A o O o o o Electricalcharacteristics O o a o o o o A o o o a +tAF. x BEF + 20 + 4NHz Freouencyrelatedcharacteristics KHz 300 Hz 30 Hz 3Hz Typically 30 psldivision of pulse tude Characteristic Performance UirementNormal Accuracyand Ldentical Resolution Resolution FrequencySpan/Div OverallRange MinimumSpan/Div Freouency Relatedcharacteristics E o oFreq O o a e O a o s33-s0GHz Accuracy Steps 10 dB/divLogMode RF Attenuatol Range Accuracy Dcto 1 GHz Accuracy Normal or Delta ModeReferenceLevel SEt With Data ENTRYpush Buttons DisplayDynamicRange Accuracy 100 DBc Delta a Mode provides differentialPerformancq Requirement DecadeTransitions C o A07-100Amplitude Externalmixer Inputsignalcharacteristics O o o a O a o e UalrbratorcAL ouT Speclfication- 494Al4g4ApService,VolJ104 ACCESSORy Pin4 Pin5 1stLO OUTPUTpower Teristics Outputsignalcharacteristics Line O a o o CS02-50 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 MHzpowerleads O o o o o o o 15.05 28.85inches232x 392x 732.gmmSrDEvtEw O c o A a o o 494A1494ApService,Vot O a o o o o o a o o A o a o o oUnpackingand INITIALINSPECT6N O o o A o o o o o o o ConnectingpowerPowerSourceand power Requirements Installation- 494A/494ApServlce,Vol O o o o o a o O o a 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 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 4g4Al494ApServiceVol O o o o o o o o o o o o o o o o o O o o o o oEouipmentreouired 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 LrlrGtr MAX 10DB/ 2ODB Preliminarypreparation O o o o o o o o o o o o PerformanceCheck procedure 4g4Ll4g4ApServiceVol Performancecheckprocedure O 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 aTrME/DrV TME/DV Auto Vertcaldtsplay O o o o a o o a o a o o oTIME/DIVAUTO SPAN/DIV Center 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 o Verticaldtsplay 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 on TME/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 o 50 Hz 20 ms SPAN/DrVTlmeMarkGenerator MarkerOutput 10dB/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 Reflevel TimeAccuracy C.**qyegp WithinS%oftherateserecitJi A o o o a o oA o a o o o a A a Minnose CheckResolutionBandwidth and shape FactorO a a o a o a O a o O o a o A o Qlglptv 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/DV 7.4 GHz 9,4 c Nro sMAooaetenLowLosscoAxcABLEwrrx sul courEEroid 0 GHz O o a o o A o O o a a aA o o o o o a Narrow Videofilter PEAK/AVERAGE A o a a a o a o o a O o o o Narrowvideofilter TME/DV Auto PEAK/AVERAGE O o a o o o A oTmeidivauto Part O o a PerformanceCheckprocedure- 4g4Al4g4ApServlceVol.1 Testsettings O a aTrME/DtV TIME/DIV Auto VerticalDisplay 21BIDIV Narrowvtdeofilter O o O o a 15.RF attenuato. test equipment setup for 50-60 dB step Widevideofilter A a a o a oCentebfreouency Display O a a o o o o a o A o o o o o A o aDB/Dtv 103 Trr O o aO a a 12s PerformanceCheck procedure- 4g4A/4g4ApServiceVol Resolutionbandwidth 100 kHzFreorange Otsplay O aCheckLO Emission -70 dBmor tess Autoresoln 18.Test equipmentsetuplor checklngharmonicdistortion PerformanceCheckprocedure- 4g4Al4g4ApServiceVol.1 EXT @o@o@g@@ Verticaldisplay LIN Triggering INT TIME/OIV PerformanceCheckprocedure- 4g4A/4g4ApServiceVol. lResolutton Bandwtdth 1 MHz Vertcal Dtsplay 2 dB/DtVTME/DV EXT CheckHORIZOUTPUTSignatLevel RrttlOptioninstruments I3fil l t r l Spanidiv DtsplayMAX Hold Tmeidiv Auto PEAK/AVERAGE Verttcal Comb Generator Mooule OutputLevel -dBm Var dB Dot Intensity Off Q15oit rilineUll TR5O2 Gpibverificationprogram A o o o c 5O9OINPUTT$ O o o o o o o a oReturn Return 5OOOREM49XPGPIBVERIFICATION Program O a o a o r 1OO1OPRINTSELECTEDDEVICE-CLEAR...SDC 8070INPUT8100PRINT 9040PRTNT10OMSGEOS A o o Onlymode Fail O c16000REM Talkonlymode 16010PAGE 16050PRTNTTALK Jtestng only 16060INPUT Message ANDRENREMorEJGPIBvERlFlcArtoH Cotapr-erEo JJLrsrEN!TALKTLF OCrnoiness 19530REMFAILUREDECISION Handler 19540PRINT!SELECT a UDK O o o o o o o O o o o o o o o19300cosuB19390 Generator Thisinstrument StancdischargeCan Damage Semiconductor Many Componentsused 7lu Adluctment Procedure- 4g4A/4g4ApServtceVotA a o Preparation Selectorswttch O o o o o o o o o o o o o o o o o o o Adjustment Procedure- 494A/494ApServiceVol TIME/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 Rrqm TIME/DIVAUTO Triggeringfreerun AdJustmantProcedure- 494A/4g4ApServiceVot. .l Test equlpment setup for adiusting the D€flection Amplifier Adiustment Procedure- 4g4Al4g4Ap ServiceVol Adfustment Procedure- 4g4Ll4g4ApServtceVot O o o o o o o o o o o o o o o oTriggering EXT 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 o Adjustnent Procedure- 4g4A/4g4ApServtceVot O a 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 R1012 R102S,R1030 Adjust Log Amptitier=?l RPlo3s-.8 @o.@@GPt AdrustmentProcedure 4g4Ll4g4ApServtce Vot O o a o o o o o o o a o o o a o Adjustment Procedure- 494l4g4Ap ServiceVot A o o o a o o a o o o o o o o o o o o oFilrcsotocr LNorE-l AdJustmentProcedure- 4g4l4g4Ap Service VotO o o o O a o o o A a o A o O o o O 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 o Tionbandwtdth SETTTNGS2Rcsct Tion Bandwidth O 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 a O o o o O o o o o Ai kHrOotHi 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 Atten O a o o O o o a o Adjustment procedure 4g4Al4g4ApseMce vot OTi#i O o aFrequencyrange To 3.0-7.1 GHz, set AdrustmentProcedure- 4g4A/494ApRplo?2/h R1OS4 Frequency Ot o AdfustrnentProcedure- 4g4A/4g4ApServtceVol A o o o A o o o o o a AdJustnentProcedure- 494A/4g4ApServtceVot Rpzoro 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 BandLevetino AdrustmentProcedure- 4g4A/4g4ApServlceVot,I O a o a o o o o oRFouT OUr Introduction Sectfon6 494A/494ApServicc Vot.1Relativesusceptibilityto Staticdischargedamage Maintenance- 4g4Al4g4ApServlce Vot TroubleshootingAids Maintenance- 494A1494ApServiceVol367-028s,00 Page Troubleshooting Using Theerrormessagedisplay Diagnostics TUNINGFAILURE- 2NDLO Powersupplyoutof Regulation TPl034 GroundRefer€nce TUNINGFAILURE- 1STLOO a o a o Malntenance- 494A/494ApServlceVol Auxiliary Synthesizer DesiredMixerfreo 1STLO Setnngaccuracy O o o o o o O o o o o o a Offset SET.540.672KHZ Ting Accu Racy 2NDLO Controldiagnosttca Strobefreq PHASELOCKFAILURE- 1STLOLockdisabled Press Help Enable Pressshifttoexit Enabledpresshelpto Disable Shift Pulsestretcher O o a o e O o a o a TracemodesMalntenance- 4S4Al4g4ApServtceVol Maintenance- 494Al4g4fupService Vof Corrective Maintenance 1R1020 A46A1Rl015 446A1Rl010Selectedcomponents HorAlr HepairTerminal O o o o o a o o o o o o A aSERvIcING TooLs FoRBoARDTffi3.i*,o= MouNTEDcoMPoNENTs Mafntenance- 494l4g4Ap ServtceVot.1 Maintenance- 494A/494ApServtceVot.1 Diode Color Code O o c a o oO o o O a a Replacingassembliesand Subassemblies O o E a o o o c o o A o o a o a o o A30A57-GPIB Interface O o O o o o O o c o o o o a Maintenance- 494Al4g4ApServiceVot.1 Sr3- ltILlrxER 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 Removal UpJ @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 Maintenanceadjustments Malntenance- 494A/494ApServiceVol EouipmentrequiredforreturnlossadjustmentO o o o o o o o o o o o o O a o o Mafntenance- 494A1494ApServtceVot.1 A o o o o o o o o a o O o o o o o a o o o O 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 o Maintenance- 494l4g4Ap ServlceVot Malntenance- 494A/4g4ApServiceVol O o o o a o oO a o o O o o o o a o o o o o o o o o o 17.Corect re3ponsetor g29 MHr tlrlrd and fourth resonators O o o o a o o Calibrated100 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 o O o a o o A o o O o oLr.fry- gllpin . DoNorposinouexy op Ffiffi Maintenance- 494A/4g4ApServtce Vot O a o a o a o o Maintenance- 4g4Al494ApService Vot.1 Mafnfenance- 4g4Ll494ApServtceVot.1 A a o a o o o O a a o o a o o A a o a o o o o o R404OFine TuneRanee Maintenanco- 4g4A/4g4Ap ServlceVol O a o a O a a o o o a o a o o A o o FREOSPAN/DV MAX Capableof measuring0 Ogmit 2 t\,tt-tz O o o a a o oMalntenance- 494A1494ApServtceVol Start Spur Amplttude O o o o a a o FREQSPAN/DV MAXFREQSPAN/DIV MAX Autoresoln on Timeidv RangeFREQSPAN/DIV MAX Autoresoln Reflevel Minrf Atten HhFr $ f Malntenance- 494A/494ApServlce VolF t Jdl tt Malntenance- 494A/4g4ApServiceVotA o O o o o a o o a a o Ll,l O o o o a Maintenance- 494A/4g4ApServtceVot.1Settings A a O a C o o o O o o o o O o o o o a oAddressBusTest Maintenance- 494A1494ApServiceVot..t 0xxx U302sSwtTcH Yr iffiI Troubleshootingon InstrumentbusMaintenance- 494A/494ApServtceVol Instrument Bus Test O o o o o a o o Responseto ADDRquery DATAinstrumentbus data command ADDRinstrumentbusaddresscommand InstrumentBusRegisters CombinedADDRcommandand DATAcommandMalntenance- 494Alttg4ApService Vol DATAinstrumentbus dataquery DB3-DBO X x x 0 0 X x x 0 1 X x x 1 0Instrumentbusregisters DB7-DBO O a o A e DBO DB5-DBO ExtmixerRfinput O o o a a DB2DB7-O DB3-DBO DB2-DBO VcoLSB DB6 DB2 DBO Front-PanelRegisters Maintenance 4g4ful4g4ApService Vol TapedatatransferprogramOFF Finished O o o aE o A o o o A o o o a o o O o o o a o O t a O 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 Secton 494A1494Ap Service,Vot Pr signals. Blockdiagrams ShowingmoreRollow 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 connectoracceptstheinputsig Andpassesdtttreiueniy 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 Tabte7-1 CAvrrYPosr+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 o ExternalCabtes Theory of Operaton 4g4A/4g4ApService, Vol. .lOu-Too---l Precision O o o o O o a o o o o O a o O a o o 2182MHz PHASELOCKED2nd LO Diagrams13 O 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 o O a O o a o MHz 2nd Converter Diagrams15 A o a o O o a a o o oO o o o o o o a o o o a o o o 829MHz2nd Conv SwitchandamplifierA o a o o o o o o Otr O 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 o 110MHztF AMpLtFtERDiagram17 Theory of Operation 4g4Al4g4ApService,VolA o o a A o o o o o o 110MHzFTLTERS Diagram173rd CONVERTERDiagram17 A o o o O o o o O a o O o o O o a o O a o REFERENCELOCKDiagramS0 O o A o o o o o o a Bandwidthselection VariabfeResolution Diagrams19, 19,104Id,and A o o o o o O o o A a o o o o O o O o o GalnRequired BandLevetingCircuitDiagram20 A o o O o Fn9 input signat.at a nominal14 dBm, is applied LOc AMp and Detector Diagram22 316 684 O a o o a316 0316 O o o Theory of Operation- 4gA/494Ap Servtce,Vol A a o o VIDEOAMpLtFtERDiagram23 FunctionaldescrtptionTheoryof Operation- 4g4ful4g4ApServtce,Vot 12. Selecdon ol display positlon on lhe log scale Theory of Operaton 494l4g4Ap Servlce,Vol VtDEo PROCESSORDAGRAM24 Ffi rffi Theory of Operaton 4g4Al4g4ApService,Vol O o DB2 DB3 C3026C2016 Filtercomponentcombinations Sytemis desisncto opn IT,r-.,.P.,9? DlclTAL STORAGEDiagrams25 O 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 o O o a a A o a a o o O o e DEFLECTIONAMpLtFtERSDiagram27 500 digitalstoragesweep positions. The resultingClisplayappearsas a bright dot sweepingacross Axisand RF Interface DTAGRAM28 O a o o O o o MHztF 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 a HTGH,VOLTAGESUPPLYDAGRAM29 O o A o O o o o O o a o GEN RUNNTNGflip-flopunassertsR/o oFF throughoR O o o o o O o o o o o oCRT READOUTDAGRAM30 Lf BLANKMSBof the characterdatais not set,the Theory 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 o Theory 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 o Address 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 a SWEEPDiagram31 Theory of Operaton 494A/494ApService,VolA o o o a o o o o o O a o o o o o a o o A o o O a O a o o o o o o o o 20ssldiv 100D4 D3 D2 D1 do 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 Triggerselectionmodes O a a o a o A o a o o o o A 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 SPANATTENUATORDiagram32 Theory ol Operaton 4g4A/494ApService,Vot 20kCalibrationcontrolselectioncodes 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 K4072 O o a o o o o o O a a o a O o o o o o o o o o a DB4DB7 Preselectordriver Diagram34 A oO o a a o o o A o Span Volts Span Volts O o a o a o a oO o a o o o o o U5031OUTPUTLINES Theory of Opera0on- 4g4\l4g4Ap Servlce,Vot TabteT-18Preselector Freouencybands Centerfreouencycontrol DIAGRAM35 O o A a a a o O o oA o a o o o o Figure Z-2S. DAC Varlance graph O o a O o o O o O a o o A o RuooeourTheory of Operaton 494l4g4Ap Servlce,Vot ADDRESS70 Formats O o o a o C o a o O o o o o o o o O o a o o o a o Theory of Operation- 4g4ful4g4ApService,Vot O o o O a aFunctionaldescription HARMONICMIXERDiagram36 AUXILIARYSYNTHESZERDiagram37 O a a A o oTheory of OperaUon- 494Al4g4ApServtce,Vot.1 O o o o o O a o o o o o a A o Theoryof Operation- 4g4A/494ApService,VolPage COUNTERBOARDDiagram38 Phaselocksynthesizer Diagrams39 O e o o o o o o o o o o o O o o aO o o o o e U2025OUTPUTLINES O e o o a o o o o o o o o o Page Theory of Operation- 494l4g4Ap Service,Vot DIGITALCONTROLDiagram9 30. System memory map Theory of Operation- 4g4Ll4g4ApServlce,Vol 31. UOaddr€ssspace Theoryof Operation- 494A/494ApServlce,Vol O o c o Theory of Operation- 4g4hl4g4ApService,VolPage A a O o O o o o o o o a o PollbitsBit O o a o o o o o A o A a o A a O o o o o Ff nsrrrcrr qrs crccrLunr 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 o O 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 o 101 102 CoL Theory of Operation- 4g4A/494ApServlce,Vol Main power Supplyfurnishes all the regulatedO o o o a o O o o o o o o 103 O a o o o o o o o a o o o o o O o o o A o o o o oTheory of Operaton 494A/494ApServtce,Vot 105 Theory of Operation- 494l4g4Ap Servlce,VotOenanon*l 106 +5 V Voltage ReferenceSupply Theory of Operation 4g4Ll4g4ApService, Vot Determiningcomponents 107 O o o o o O a a o a o o a a a o o o a oPage Opl ONs RcV/134Swtss CalibratorOutput cALOUT O 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 a o o a o o o o o o o a o o o o o o o O a o O o o o o o o o o o o oFreouency OoultnGffi O o o o a o o o A o A aGoesanoffi Symmetry A o o a o o A o o o o a a o o o a o o o o GeneraltermsVtdeoimarker Amplitudeterms Gfoesary- 494l4g4Ap Service,VolO o o o o o Frequencyterms Digitalstorageterms A o a o o O a a o o a O o o o o O o a o o o Manual Part No G556O-00 Flrst prtnilng JAN1987 Revleed Revisioninformation O o a a o a o o o o o o a o o Instrument O o o o a o12s SENSmVTY O o Efr/sN O o a o o A o a o O 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 Dale2-22-88 Productsee llst DeflectionAmplifiertestpointsandadjustments Page5 ol O a o o o o o o o o Performance Checkprocedure O o o o o O o aInstrument Manual A o o o O o O a a ADD Instbument Partno O o o o o O o o o a Perfrmanceheck pRocEDURE change stepr r as foltows Product494N4g4Ap ServiceVolDate 5/u9o O a o o o Product494N494Ap ServiceVot.1O a o o o o Date 6/1190 Peaiaverage RHILO0 Vehticaldisplay + \ +i\ DB Bandwidth Limits 60dB Measured Resolution Verncal Freouency Bandwidth Display SpaivdivMHz DB Bandwidth MHz 10dB 100kHz Narrow Videofilter TIME/DIV Auto Peaivaverage ResolutionbandwdithParti Minnoise Verticaldisplay Peavaverage A a a Check1 dB Compressionpoint SpecificationTercfgnix CHANcE INFoRMAnoN PerformanceVerification Ref. C1-991 FREQUENCYSPAN/DIV 1 MHz RESOLUTIONBANDWTDTH1 MHzProduct SeeLlst Date11 SpectrumAnalyzerUnder Test A o a o o O c