Manuals / Tektronix / Kitchen Appliance / Water Dispenser

Tektronix 494AP service manual O o o o a o, A o, Ram, Rom, Powersupply

Models: 494AP 494A

1 336

Download 336 pages 53.32 Kb

Page 14

4944/494APServlce Vot. 1

TABLEOF CONTENTS(Cont.)

o a o

I

,a

		Page
Section7 THEORYOF OPERATTON(Conr)
DtctTALCONTROLSECTTON		7	_88
Microcomputer		7	-gg
Processor		7-gg
Microprocessor		7-88
Cfock		......7-92
Microcomputer		,....T-92
Bus
AddressDecoder		Z-92
Timer		......7-gz
PIAand lnstrumentBus		......7-92
DMAController		......7-gz
InterruptProcessing		7:-93
Memory			2-94
AddressDecoders		7	-94
RAM		......7-94
Options		7	-95
ROM		......7-96
ROMBanksandGptB		7	-96
AddressDecoder		7-96
BankSelector		7	-96
BankROMs		.....7	-96
GPIBSwitches		,....7-97
GPfA		......7-97
AccessorissInterface		,.,....Z-gT
Frontpanel		7	_97
Pot€ntiometers		7	-98
output Mode shift

R€gistersand LEDs		7	-98
Processor	...,....7		-98
Scanningthe Keyboard		7-98
Scanningthe FREQUENCY
ControlCoder		.. 7-gg
Outputtingthe
CorrectCode		7	-99
Software	..........	7-gg
MainScanRoutine		7-99
KeyboardCheck
Subroutine	.......	7-100
FrequencyCoder
SubroutineCheck		7-100
OutputSubroutine		7-100

	Page
POWERSUPPLY		7-103
PrimaryCircuits		7-103
LineInputCircuits		7	-103
Invert€rCircuit	.....7		-103
Multivibrator	.... 7		-103
RampGenerator		7	-l04
PrimaryRegulator		7	-104
InverterLogic		7	-104
InverterDriver	,.......7-105
OutputStage	,.........7-105
Soft Start and Primary
Over-CurrentCircuits	"	...7	-105
Secondary&
FanDriveCircuits	.....7-106
Rectifier-FilterCircuits		7-106
*5V Voltage
ReferenceSupply
RegulatorCircuits	.....7-106
+5V Over-Voltage
ProtectionCircuit	......	7-106
FanDriveCircuit	-	7-107
Sectlon8 OPTIONS
OptionsA1-A5 PowerCordOptions ....		8-1
OptionBl ServiceManuals		8-1
OptionsMl-MS ExtendedService
andWanantyOptions		8-1
Option07 75O Input		8-2
Option08 Delet€ External
MixerInput	....8-2
Options21 and 22
WaveguideMixers		8	-g
Option39 AlternateBattery		84
Option41 DigitalRadio		8	-4
Option42110MHzlF Output		8	-4
Option45 MATECO		8	-4
Option52 NorthAmerican220V		8-4
AppendlxA GLOSSARY
GENERALTERMS		A.1
FREQUENCYTERMS	... A-2
AMPLITUDETERMS	..... A-2
DIGITALSTORAGETERMS ..-		A-3
WAVEFORMMARKERTERMS		A-3

o o a o

a

I

o

to

t

a

o

o

I

a a o o o o a o

t

a o

Io

o o

Io

o

I

o

O

vl

o o o

Image 14

Tektronix 494AP service manual O o o o a o, A o, Ram, Rom, Powersupply

Contents

Tektronix Page O o o o o o o o a o O o o o o o o o o Releaseof Copyright O a a o o o O oO o o o o O a o o A a a a a O 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 CONTENTSGonr O o o O a o o o O a o o o O o a o o o O o tA a o o o a o o O o o o o o O o a o A o o o o o A o PowersupplyO o o o a o RAM VOLUME2 494A/94APServiceVot.1 494A/494APServlceVol O o o oO t Preselector P3035on theVideoProcessorboard Rejection 494A/494APServtceVot.1 A o O oO o o 494A/494APServlceVot Simplifiedschematicof harmonicmixerBasicblockdiagramof a -rNsynthesizer Simplifieddigital-to-analog Converter O o a o O a oO o o Options 22 Waveguide 944/494AP Service VotSpEctFtcATloNs MtxERSCHARACTERTSTTCS O a o Do Not ServiceAloneO o o o This Manual O a o o o A o o o o Sedon 1 4g4l494Ap Servlce,Vol Value. O a O o O o o oSEL WM 490E 490W Mlxer 18to 26.5to 33 to 490U 40 toWM 49OV 10to 170GHz O o A o Electricalcharacteristics O o o o O o a o o o o A o o o a Freouencyrelatedcharacteristics +tAF. x BEF + 20 + 4NHz Resolution FrequencySpan/Div OverallRange MinimumSpan/Div Characteristic Performance UirementNormal Accuracyand Ldentical Resolution KHz 300 Hz 30 Hz 3Hz Typically 30 psldivision of pulse tude Freq Freouency RelatedcharacteristicsE o o 33-s0GHz O o a eO a o s Accuracy Steps 10 dB/divLogMode DisplayDynamicRange Accuracy Accuracy Normal or Delta ModeReferenceLevel SEt With Data ENTRYpush Buttons RF Attenuatol Range Accuracy Dcto 1 GHz DecadeTransitions Delta a Mode provides differentialPerformancq Requirement 100 DBc Amplitude C oA07-100 Inputsignalcharacteristics Externalmixer O a o e O o o a 1stLO OUTPUTpower Speclfication- 494Al4g4ApService,VolJ104 ACCESSORy Pin4 Pin5 UalrbratorcAL ouT Outputsignalcharacteristics Teristics O a o o Line CE03-15 kHzto 50 MHzpowerleads Speclfication- 494A1494APService,Vot.1Temperature Operatingand Humidity CS02-50 KHz to 400 MHz power F u l l l i m i t Leads SrDEvtEw 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 Installation- 494A/494ApServlce,Vol ConnectingpowerPowerSourceand power Requirements O o o A o o o o o o o O o o o o o o O o o o o a 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 c o O a o o Secton 4g4Al494ApServiceVol O o o o o o o o o o o o o o o o o o o Eouipmentreouired O o o o o o o o o o o o o o o o oO o o o o o LodB/soolttffi LrlrGtr O o o o o o o o o o o o o o o o o o o oAccuracy*0.2s dB io Eouipment Reouired Preliminarypreparation MAX 10DB/ 2ODB PerformanceCheck procedure 4g4Ll4g4ApServiceVol O o o o o o o o o o o o TrME/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 SPAN/DIV O o o o a o o a o a o o oTIME/DIVAUTO TME/DV Auto Vertcaldtsplay A a o o o o o o o a o o o o o a o o o o o O a o o o o oA a o o o Center Freouencyaccuracycheckpoints Autoresoln on 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 Verticaldtsplay O o a o o o o o o a o o o o o a o o ResolutionbandwidthautoO a o a o a o a a TME/DVAUTO MarkerOutput SPAN/DrVTlmeMarkGenerator 50 Hz 20 ms Autoresoln Reflevel 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 10dB/Dtv A a A o o o a o oA o a o o o a TimeAccuracy C.**qyegp WithinS%oftherateserecitJi O a o O o a o A o CheckResolutionBandwidth and shape FactorO a a o a o a Minnose Qlglptv to 50Hz, andVERlCnl.drdpr-ry SPAN/DV O o a o a A o o o o o o o o o o O o o o oA o o MIN RFATTENdB 0 GHz Nro sMAooaetenLowLosscoAxcABLEwrrx sul courEEroid 7.4 GHz 9,4 c A o o o o o a O o a o o A oO o a a a A o a a a o a o o a O o o o Narrow Videofilter PEAK/AVERAGE Part O o a o o o A oTmeidivauto Narrowvideofilter TME/DV Auto PEAK/AVERAGE PerformanceCheckprocedure- 4g4Al4g4ApServlceVol.1 O o a TrME/DtV TestsettingsO a a Narrowvtdeofilter VerticalDisplay 21BIDIV TIME/DIV Auto 15.RF attenuato. test equipment setup for 50-60 dB step O o O o a Display A a a o a oCentebfreouency Widevideofilter DB/Dtv O a a o o o o a o A o o o o oA o a 12s O o aO a a 103 Trr Freorange PerformanceCheck procedure- 4g4A/4g4ApServiceVolResolutionbandwidth 100 kHz Autoresoln O aCheckLO Emission -70 dBmor tess Otsplay PerformanceCheckprocedure- 4g4Al4g4ApServiceVol.1 18.Test equipmentsetuplor checklngharmonicdistortion @o@o@g@@ EXT Bandwtdth 1 MHz PerformanceCheckprocedure- 4g4A/4g4ApServiceVol. lResolutton Verticaldisplay LIN Triggering INT TIME/OIV TME/DV EXT VertcalDtsplay 2 dB/DtV I3fil l t r l RrttlOptioninstruments CheckHORIZOUTPUTSignatLevel MAX Hold SpanidivDtsplay Verttcal Tmeidiv Auto PEAK/AVERAGE Comb Generator Mooule TR5O2 Q15oit rilineUll OutputLevel -dBm Var dB Dot Intensity Off A o o o c Gpibverificationprogram Return 5OOOREM49XPGPIBVERIFICATION Program O o o o o o o a oReturn 5O9OINPUTT$ O a o a o r 9040PRTNT10OMSGEOS 8070INPUT8100PRINT 1OO1OPRINTSELECTEDDEVICE-CLEAR...SDC A o o 16050PRTNTTALK Jtestng only 16060INPUT O c16000REM Talkonlymode 16010PAGE Onlymode Fail JJLrsrEN!TALKTLF OCrnoiness ANDRENREMorEJGPIBvERlFlcArtoH Cotapr-erEo Message Generator O o o o o o o O o o o o o o o19300cosuB19390 19530REMFAILUREDECISION Handler 19540PRINT!SELECT a UDK Semiconductor Many Componentsused StancdischargeCan Damage Thisinstrument Preparation Adluctment Procedure- 4g4A/4g4ApServtceVotA a o 7lu Selectorswttch Adjustment Procedure- 494A/494ApServiceVol O o o o o o o o o o o o o o o o o o o Rrqm 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 TIME/DIV MNL AdJustmantProcedure- 494A/4g4ApServiceVot. .l TIME/DIVAUTO Triggeringfreerun Adiustment Procedure- 4g4Al4g4Ap ServiceVol Test equlpment setup for adiusting the D€flection Amplifier Triggering EXT Adfustment Procedure- 4g4Ll4g4ApServtceVotO 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 o o o AdJustmentProcedure- 494A1494ApService VotO o o o o o o o o o o o o OuFur GarnR1033 nrors 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/4g4ApServtceVotO a o O o o o o o o o o RPlo3s-.8 Adjust Log Amptitier=?l R1012 R102S,R1030 AdrustmentProcedure 4g4Ll4g4ApServtce Vot @o.@@GPt O 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 A a o A o O o o AdJustmentProcedure- 4g4l4g4Ap Service VotO o o o O a o o o LNorE-l O o a o o a o o a a o o o o o o o o o o o o o o O o o o o o o o a Tion Bandwidth SETTTNGS2Rcsct Tionbandwtdth O o a o a o a $o o3 $oO o o o a a O o o o o a o o o a o a o o o OotHi O o o o O o o o oAi kHr MIN RF Atten 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 Triggering Auto Adjustment procedure 4g4Al4g4ApseMce vot O a o o O o o a o Frequencyrange OTi#iO o a R1OS4 Frequency AdrustmentProcedure- 4g4A/494ApRplo?2/h To 3.0-7.1 GHz, set AdfustrnentProcedure- 4g4A/4g4ApServtceVol Ot o A o o o AdJustnentProcedure- 494A/4g4ApServtceVot A o o o o o a Snrnasrzen @ Lt. a o o a o O a o@@r Rpzoro O o o o o A o o o o AdjustOption0Z VR BandLevetino Optioninstruments Only RFouT 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 Diagnostics Troubleshooting Using Theerrormessagedisplay TUNINGFAILURE- 2NDLO Powersupplyoutof Regulation Malntenance- 494A/494ApServlceVol TUNINGFAILURE- 1STLOO a o a o TPl034 GroundRefer€nce 1STLO Setnngaccuracy DesiredMixerfreo Auxiliary Synthesizer O o o o o o O o o o o o a 2NDLO Controldiagnosttca Offset SET.540.672KHZ Ting Accu Racy Enabledpresshelpto Disable PHASELOCKFAILURE- 1STLOLockdisabled Press Help Enable Pressshifttoexit Strobefreq O o a o e Shift Pulsestretcher Malntenance- 4S4Al4g4ApServtceVol O o a o aTracemodes Corrective Maintenance Maintenance- 494Al4g4fupService Vof Selectedcomponents 1R1020A46A1Rl015 446A1Rl010 Mafntenance- 494l4g4Ap ServtceVot.1 O o o o o a o o o o o o A aSERvIcING TooLs FoRBoARDTffi3.i*,o= MouNTEDcoMPoNENTs HorAlr HepairTerminal O o o O a a Maintenance- 494A/494ApServtceVot.1 Diode Color CodeO o c a o o O o E a o o o c o o A o o a o a o o Replacingassembliesand Subassemblies O o O o o o O o c o o o o a A30A57-GPIB Interface LlrxER 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 Main PowerSupplyModule Removal EAUloNl @o @@tr\ UpJ Maintenanceadjustments 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 O o o o o o o o o o o o o O a o o Malntenance- 494A/494ApServiceVolEouipmentrequiredforreturnlossadjustment A o o o o o o o o a o O o o o o o a o o o Mafntenance- 494A1494ApServtceVot.1 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 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 Maintenance- 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 O o o o a o o 17.Corect re3ponsetor g29 MHr tlrlrd and fourth resonators O o o o o o o o o o o O a o oO o o o o o o o a o o Calibrated100 MHz.with +20 kHz accu Lr.fry- gllpin . DoNorposinouexy op O o a o oA o o O o o Maintenance- 494A/4g4ApServtce Vot Ffiffi Maintenance- 4g4Al494ApService Vot.1 O a o a o a o o A a o a o o o Mafnfenance- 4g4Ll494ApServtceVot.1 O a a o o a o o A a o a o o o o o Maintenanco- 4g4A/4g4Ap ServlceVol R404OFine TuneRanee O a a o o o a o a o o O a o a A o o FREOSPAN/DV MAX Start Spur Amplttude O o o a a o oMalntenance- 494A1494ApServtceVol Capableof measuring0 Ogmit 2 t\,tt-tz FREQSPAN/DIV MAX Autoresoln on O o o o a a oFREQSPAN/DV MAX Minrf Atten RangeFREQSPAN/DIV MAX Autoresoln Reflevel Timeidv F t HhFr $ fMalntenance- 494A/494ApServlce Vol Ll,l Malntenance- 494A/4g4ApServiceVotA o O o o o a o o a a o Jdl tt A a Maintenance- 494A/4g4ApServtceVot.1Settings O o o o a O a AddressBusTest C o o o O o o o oO o o o o a o SwtTcH Maintenance- 494A1494ApServiceVot..t0xxx U302s O o o o o a o o Troubleshootingon InstrumentbusMaintenance- 494A/494ApServtceVol Instrument Bus Test Yr iffiI ADDRinstrumentbusaddresscommand Responseto ADDRquery DATAinstrumentbus data command DATAinstrumentbus dataquery CombinedADDRcommandand DATAcommandMalntenance- 494Alttg4ApService Vol InstrumentBusRegisters DB7-DBO X x x 0 0 X x x 0 1 X x x 1 0Instrumentbusregisters DB3-DBO O a o A e Rfinput DBO DB5-DBOExtmixer DB7-O DB3-DBO O o o a aDB2 DB6 DB2 DBO VcoLSB DB2-DBO Front-PanelRegisters OFF Maintenance 4g4ful4g4ApService VolTapedatatransferprogram A o o o A o o o a o o O o o aE o Finished O t a O o o o a o 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 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 RF Input TheRFINPUT50 connectoracceptstheinputsig RF InterfaceCircuits Diagram28Lst ConverterDiagram12 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 a o o o o o o a o Andpassesdtttreiueniy oroPage Tabte7-1 O o o o o o O o o o o o oTheoryof Operafon 4g4A/494ApServlce,Vot 2NDCONVERTERIF Selection O o o a o o o o o o o o o o o 2472MHz2ND CONVERTERDiagram12O o o O o o a o o o o o o o o CAvrrYPosr+l+ Precision Theory of Operaton 4g4A/4g4ApService, Vol. .lOu-Too---l ExternalCabtes 2182MHz PHASELOCKED2nd LO Diagrams13 O o o o O o a o o o o O a o O a o o O a o O o O o o o O a o a o o o o o o o o a o o a o o Vco MHz 2nd Converter Diagrams15 O a O o a o O o o o o o o a o o o a o o o A o a oO o a a o o o Otr SwitchandamplifierA o a o o o o o o 829MHz2nd Conv O o a a a o o o O o o a Page O o a a o o a o o o O o a a o o o o o A o o a 110MHztF AMpLtFtERDiagram17Theory of Operation 4g4Al4g4ApService,Vol A o o o O o o o O a o 110MHzFTLTERS Diagram173rd CONVERTERDiagram17 A o o o o o o REFERENCELOCKDiagramS0 O o o O o a o O a o O o A o o o o o o a VariabfeResolution Diagrams19, 19,104Id,and Bandwidthselection A o o o o o O o o A a o o o o O o O o o BandLevetingCircuitDiagram20 GalnRequired A o o O o LOc AMp and Detector Diagram22 Fn9 input signat.at a nominal14 dBm, is applied 0316 O a o o a316 316 684 O o o A a o o Theory of Operation- 4gA/494Ap Servtce,Vol Theoryof Operation- 4g4ful4g4ApServtce,Vot VIDEOAMpLtFtERDiagram23Functionaldescrtption Theory of Operaton 494l4g4Ap Servlce,Vol 12. Selecdon ol display positlon on lhe log scale VtDEo PROCESSORDAGRAM24 Theory of Operaton 4g4Al4g4ApService,Vol Ffi rffi O o Filtercomponentcombinations C3026C2016 DB2 DB3 DlclTAL STORAGEDiagrams25 Sytemis desisncto opn IT,r-.,.P.,9? O o LI l Theory of Operadon- 4g4N4g4Ap Servtce,Vot.lPage O o O a o o O o o o o O o o o o o a o o o Theoryof Operafon 494A/4g4ApServlce,Vol O o e O o a a A o a a o o Clisplayappearsas a bright dot sweepingacross DEFLECTIONAMpLtFtERSDiagram27500 digitalstoragesweep positions. The resulting O a o o O o o Axisand RF Interface DTAGRAM28 O o O o o a o o A o O o o o o o o o O a a Enables CurrentdriversTransferswitchdriver MHztF high Stateor F829 MHzlF towstate O o A o O o o o O o a o HTGH,VOLTAGESUPPLYDAGRAM29 Lf BLANKMSBof the characterdatais not set,the O o o o o O o o o o o oCRT READOUTDAGRAM30 GEN RUNNTNGflip-flopunassertsR/o oFF throughoR Theory of Operatlon 4g4A/4g4Ap Service, Vol Zo-cou I lF-€ 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 OFFTME u1055-d X o o o o o X x x x x xX x o o o o o X . 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 Theory of Operation- 4g4l4g4Ap Servlce,Vol Oe o \i o Address of Ascii code Skip bit Blank character 58O O o o a o o o o a O o o o o o o o O o a Theory of Opera$on- 494l4g4Ap Servtce,Vol A 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 Triggerselectionmodes Theory of Operation- 494A/494ApService,Vol Tabte7-12O a o o a o o o a o o o o o TriggerMode Freerun Internal Ext€rnal Line TableZ-13 A o a o o o o O a a o a 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 SPANATTENUATORDiagram32 A o A o o A o o o o a o o Calibrationcontrolselectioncodes Theory ol Operaton 4g4A/494ApService,Vot20k Xl K3065 x0.1 K3075 x0.01 K4072 1st LO DRTVERDiagram33O o o o a a a o o A o o a a a X0.01 DB7 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 U5031OUTPUTLINES O o a o a o a oO o a o o o o o Span Volts Span Volts Preselector 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 O o a O o o Figure Z-2S. DAC Varlance graph Theory of Operaton 494l4g4Ap Servlce,Vot O o O a o o A oRuooeour O o o a o ADDRESS70 Formats O o a o o o a o C o a o O o o o o o o o Functionaldescription Theory of Operation- 4g4ful4g4ApService,VotO o o O a a HARMONICMIXERDiagram36 Theory of OperaUon- 494Al4g4ApServtce,Vot.1 AUXILIARYSYNTHESZERDiagram37O a a A o o Theoryof Operation- 4g4A/494ApService,Vol O o o o o O a o o o o o a A oPage 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 DIGITALCONTROLDiagram9 Theory of Operation- 494l4g4Ap Service,Vot Theory of Operation- 4g4Ll4g4ApServlce,Vol 30. System memory map Theoryof Operation- 494A/494ApServlce,Vol 31. UOaddr€ssspace Theory of Operation- 4g4hl4g4ApService,Vol O o c oPage Bit A a O o O o o o o o o a oPollbits A o A a o O o a o o o o o Lunr 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 a o O o o o O o o a o A o o O o o o o o o o a o o o o o o o o O o o o o o o o o a o o 100 101 CoL 102 103 Main power Supplyfurnishes all the regulatedO o o o a o O o o o o o o Theory of Operation- 4g4A/494ApServlce,Vol Theory 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 Theory of Operation 4g4Ll4g4ApService, Vot 106 +5 V Voltage ReferenceSupply O o o o o O a a o a o o a a a o o o a o Determiningcomponents 107Page Swtss Opl ONsRcV/134 O a o o o o o o o o o O o o O o o o CalibratorOutput cALOUT A 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 Symmetry O o o o a o o o A o A aGoesanoffi OoultnGffi A o o a o o Vtdeoimarker A o o o o a a o o o a o o o oGeneralterms Frequencyterms Gfoesary- 494l4g4Ap Service,VolO o o o o o Amplitudeterms A o a o o Digitalstorageterms O o a o o o O a a o o a O o o o o Revisioninformation Manual Part No G556O-00 Flrst prtnilng JAN1987 Revleed O o a a o a o o o o o o a o o SENSmVTY O o o o a o12s Instrument O o O o a o o A o a o Efr/sN O o o A o a o o O o o o o o o O o O o o o Product see llst Dale2-22-88 Chg. Ref M63911 DeflectionAmplifiertestpointsandadjustments Page5 ol Productsee llst O 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 Instbument Partno ADD O 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 Date 6/1190 ServiceVot.1O a o o o o Product494N494Ap Vehticaldisplay RHILO0 Peaiaverage +i\ + \ MHz 10dB 100kHz Resolution Verncal Freouency Bandwidth Display SpaivdivMHz DB Bandwidth DB Bandwidth Limits 60dB Measured Minnoise Verticaldisplay ResolutionbandwdithParti Narrow Videofilter TIME/DIV Auto Peaivaverage A a a Peavaverage PerformanceVerification SpecificationTercfgnix CHANcE INFoRMAnoN Check1 dB Compressionpoint SpectrumAnalyzerUnder Test FREQUENCYSPAN/DIV 1 MHz RESOLUTIONBANDWTDTH1 MHzProduct SeeLlst Date11 Ref. C1-991 A o a o o O c