Tektronix 2465B User manual

ServiceManual
Tektronix
2465B& 2467B
Oscilloscopes
070-6863-01
Warning
Theservicinginstructionsareforusebyqualified
personnelonly.Toavoidpersonalinjury,donot
performanyservicingunlessyouarequalifiedto
doso.RefertotheSafetySummarypriorto
performingservice.
Pleasecheckforchangeinformationattherear
ofthismanual.

InstrumentSerialNumbers
EachinstrumentmanufacturedbyTektronixhasa serialnumberona panelinsertortag,orstampedonthe
chassis.Thefirstletterintheserialnumberdesignatesthecountryofmanufacture.Thelastfivedigitsofthe
serialnumberareassignedsequentiallyandareuniquetoeachinstrument.Thosemanufacturedinthe
UnitedStateshavesixuniquedigits.Thecountryofmanufactureisidentifiedasfollows:
B010000Tektronix,Inc.,Beaverton,Oregon,USA
E200000TektronixUnitedKingdom,Ltd.,London
J300000Sony/Tektronix,Japan
H700000TektronixHolland,NV,Heerenveen,TheNetherlands
InstrumentsmanufacturedforTektronixbyexternalvendorsoutsidetheUnitedStatesareassigneda twodigit
alphacodetoidentifythecountryofmanufacture (e.g., JPforJapan,HKforHongKong,ILforIsrael,etc.).
Tektronix,Inc.,RO.Box500,Beaverton,OR97077
Printedin U.S.A.
Copyright© Tektronix,Inc.,1988.Allrightsreserved.TektronixproductsarecoveredbyU.S.andforeign
patents,issuedandpending.Thefollowingareregisteredtrademarks:TEKTRONIX,TEK,TEKPROBE,and
SCOPE-MOBILE.

WARRANTY
Tektronixwarrantsthatthisproductwillbefreefromdefectsinmaterialsandworkmanshipfora periodofthree(3)yearsfrom
thedateofshipment.Ifanysuchproductprovesdefectiveduringthiswarrantyperiod,Tektronix,atitsoption,eitherwillrepair
thedefectiveproductwithoutchargeforpartsandlabor,orwillprovidea replacementinexchangeforthedefectiveproduct.
Inordertoobtainserviceunderthiswarranty,CustomermustnotifyTektronixofthedefectbeforetheexpirationofthewarranty
periodandmakesuitablearrangementsfortheperformanceofservice.Customershallberesponsibleforpackagingand
shippingthedefectiveproducttotheservicecenterdesignatedbyTektronix,withshippingchargesprepaid.Tektronixshall
payforthereturnoftheproducttoCustomeriftheshipmentistoa locationwithinthecountryinwhichtheTektronixservice
centerislocated.Customershallberesponsibleforpayingallshippingcharges,duties,taxes,andanyotherchargesfor
productsreturnedtoanyotherlocations.
Thiswarrantyshallnotapplytoanydefect,failureordamagecausedbyimproperuseorimproperorinadequatemaintenance
andcare.Tektronixshallnotbeobligatedtofurnishserviceunderthiswarrantya)torepairdamageresultingfromattemptsby
personnelotherthanTektronixrepresentativestoinstall,repairorservicetheproduct;b)torepairdamageresultingfrom
improperuseorconnectiontoincompatibleequipment;orc)toservicea productthathasbeenmodifiedorintegratedwith
otherproductswhentheeffectofsuchmodificationorintegrationincreasesthetimeordifficultyofservicingtheproduct.
THISWARRANTYISGIVENBYTEKTRONIXWITHRESPECTTOTHISPRODUCTINLIEUOFANYOTHER
WARRANTIES,EXPRESSEDORIMPLIED.TEKTRONIXANDITSVENDORSDISCLAIMANYIMPLIEDWARRANTIESOF
MERCHANTABILITYORFITNESSFORA PARTICULARPURPOSE.TEKTRONIX'RESPONSIBILITYTOREPAIROR
REPLACEDEFECTIVEPRODUCTSISTHESOLEANDEXCLUSIVEREMEDYPROVIDEDTOTHECUSTOMERFOR
BREACHOFTHISWARRANTY.TEKTRONIXANDITSVENDORSWILLNOTBELIABLEFORANYINDIRECT,SPECIAL,
INCIDENTAL,ORCONSEQUENTIALDAMAGESIRRESPECTIVEOFWHETHERTEKTRONIXORTHEVENDORHAS
ADVANCENOTICEOFTHEPOSSIBILITYOFSUCHDAMAGES.

2465B/2467BService
TABLEOFCONTENTS
Page Page
SECTION1
SECTION2
LISTOFILLUSTRATIONSill
LISTOFTABLESiv
OPERATORSSAFETYSUMMARY....vi
SERVICINGSAFETYSUMMARYvii
SPECIFICATION
INTRODUCTION1-1
PERFORMANCECONDITIONS1-1
OPERATINGINFORMATION
SAFETY2-1
LINEVOLTAGESELECTION2-1
LINEFUSE2-1
POWERCORD2-1
INSTRUMENTCOOLING2-1
OPERATINGINFORMATION2-1
START-UP2-2
REPACKAGINGFORSHIPMENT..2-2
SECTION3 THEORYOFOPERATION
(SNB050000& ABOVE)
INTRODUCTION3a-1
SECTIONORGANIZATION3a-1
HYBRIDANDINTEGRATED
CIRCUITDESCRIPTIONS3a-1
BLOCKDIAGRAM3a-1
BLOCKDESCRIPTION3a-1
DETAILEDCIRCUITDESCRIPTION3a-5
INTRODUCTION3a-5
PROCESSORANDDIGITAL
CONTROL3a-5
FRONT-PANELSCANNINGand
ANALOGCONTROLS3a-9
FRONT-PANELCONTROLS3a-11
ATTENUATORSANDPREAMPS..3a-13
DISPLAYSEQUENCER,
TRIGGERS,ANDSWEEPS3a-17
VERTICALCHANNELSWITCH
ANDOUTPUTAMPLIFIERS3a-23
READOUT3a-27
HIGHVOLTAGEPOWERSUPPLY
ANDCRTFOR2465BONLY3a-35
HIGHVOLTAGEPOWERSUPPLY
ANDMCP-CRTFOR2467BONLY3a-40
LOWVOLTAGEPOWERSUPPLY.3a-46
LOW-VOLTAGEREGULATORS3a-51
POWERDISTRIBUTION3a-53
INTERCONNECTIONS3a-53
SECTION3 THEORYOFOPERATION
(SNB049999& BELOW)
INTRODUCTION3-1
SECTIONORGANIZATION3-1
HYBRIDANDINTEGRATED
CIRCUITDESCRIPTIONS3-1
BLOCKDIAGRAM3-1
BLOCKDESCRIPTION3-1
DETAILEDCIRCUITDESCRIPTION3-5
INTRODUCTION3-5
PROCESSORANDDIGITAL
CONTROL3-5
FRONT-PANELSCANNINGand
ANALOGCONTROLS3-9
FRONT-PANELCONTROLS3-11
ATTENUATORSANDPREAMPS..3-13
DISPLAYSEQUENCER,
TRIGGERS,ANDSWEEPS3-17
VERTICALCHANNELSWITCH
ANDOUTPUTAMPLIFIERS3-23
READOUT3-27
HIGHVOLTAGEPOWERSUPPLY
ANDCRTFOR2465BONLY3-35
HIGHVOLTAGEPOWERSUPPLY
ANDMCP-CRTFOR2467BONLY3-40
LOWVOLTAGEPOWERSUPPLY.3-46
LOW-VOLTAGEREGULATORS3-51
POWERDISTRIBUTION3-53
INTERCONNECTIONS3-53
SECTION4 PERFORMANCECHECKAND
FUNCTIONALVERIFICATION
INTRODUCTION4-1
PREPARATION4-1
VERTICAL4-4
TRIGGERING4-15
HORIZONTAL4-20
PARAMETRICMEASUREMENTS
CHECK4-27
COUNTER/TIMER/TRIGGER
CHECKS4-29
HORIZONTAL(cont)4-34
CALIBRATOR,EXTERNAL
Z-AXIS ANDGATEOUTPUTS4-36
ADDITIONALFUNCTIONAL
VERIFICATION4-38
WORDRECOGNIZERCHECKS4-40
I

2465B/2467BService
TABLEOFCONTENTS(cont)
Page Page
SECTION5
SECTION6
ADJUSTMENTPROCEDURE
INTRODUCTION5-1
PARTIALPROCEDURE5-2
PREPARATIONFOR
ADJUSTMENT5-2
POWERSUPPLIESAND
DACREFADJUSTMENTS5-2
2467BCRTADJUSTMENTS5-4
2465BCRTADJUSTMENTS5-7
CH1 ANDCH2 INPUT
CAPACITANCE,AND
VERTICALREADOUTJITTER
ADJUSTMENTS5-10
AUTOMATICCALIBRATION
CONSTANTS,HORIZONTAL
ANDVERTICALGAIN,
CENTERING,ANDTRANSIENT
RESPONSEADJUSTMENTS5-13
CAL01—HORIZONTAL5-13
CAL02—VERTICAL5-16
CAL03—TRIGGERING5-18
CAL04—CH2 DELAY
ENABLE/DISABLE5-19
CAL05—SetHRSONand
PWRON/OFFCYCLES5-20
CAL06—VERTICAL
TRANSIENTRESPONSE5-20
CAL07—READOUTCENTERING
ANDGAIN5-22
CAL09—PARAMETRIC
MEASUREMENTS5-22
DYNAMICCENTERING,
DCBALANCE,AND
X-YPHASEDIFFERENTIAL
ADJUSTMENTS5-25
MAINTENANCE
STATIC-SENSITIVECOMPONENTS6-1
PREVENTIVEMAINTENANCE6-2
INTRODUCTION6-2
GENERALCARE6-2
INSPECTIONAND
CLEANING6-2
LUBRICATION6-4
SEMICONDUCTORCHECKS6-4
PERIODICREADJUSTMENT6-4
TROUBLESHOOTING6-5
INTRODUCTION6-5
TROUBLESHOOTINGAIDS6-5
TROUBLESHOOTING
EQUIPMENT6-7
SECTION7
SECTION8
TROUBLESHOOTING
TECHNIQUES6-7
DIAGNOSTICROUTINES6-10
CORRECTIVEMAINTENANCE6-20
INTRODUCTION6-20
MAINTENANCEPRECAUTIONS....6-20
OBTAININGREPLACEMENT
PARTS6-20
MAINTENANCEAIDS6-21
INTERCONNECTIONS6-21
TRANSISTORS,INTEGRATED
CIRCUITS,ANDHYBRID
CIRCUITS6-22
SOLDERINGTECHNIQUES6-22
REMOVALANDREPLACEMENT
INSTRUCTIONS6-24
OPTIONS
INTRODUCTION7-1
POWERCORDOPTIONS7-1
OPTION01(2465BONLY)7-1
OPTION1R7-1
OPTION057-2
OPTIONS06AND097-2
OPTION107-2
OPTION117-2
2465BREPLACEABLEELECTRICAL
PARTS
SECTION9 2467BREPLACEABLEELECTRICAL
PARTS
SECTION10DIAGRAMS
ACRONYMDICTIONARY
SECTION112465BREPLACEABLEMECHANICAL
PARTS
SECTION122467BREPLACEABLEMECHANICAL
PARTS
CHANGEINFORMATION
DiagnosticandTroubleshootingInformation:
DIAGNOSTICROUTINES6-10
TROUBLESHOOTINGCHARTSSECTION10
II

2465B/2467BService
LISTOFILLUSTRATIONS
FigurePage
1-12465BDimensionaldrawing1-22
1-22467BDimensionaldrawing1-23
2-1Lineselectorswitch,linefuse,anddetachablepowercord2-2
(ForSNB050000& Above)
3-1Instrumentblockdiagram3a-2
3-1Instrumentblockdiagram(cont)3a-3
3-2Addressdecoding3a-7
3-3Front-panelswitchmatrix3a-12
3-4Scaleilluminationcircuit3a-16
3-5Sweepgenerator3a-22
3-6Developingthereadoutdisplay3a-28
3-7Readoutdisplaypriorities3a-32
3-8TimingofRefreshPrioritizer3a-33
3-9Dcrestorercircuit(2465Bonly)3a-38
3-10Dcrestorercircuit(2467Bonly)3a-43
3-11TimingrelationshipsoftheInverterDrivesignals3a-48
3-12Simplifiedschematicofcontrolnetwork3a-49
(ForSNB049999& Below)
3-1Instrumentblockdiagram3-2
3-1Instrumentblockdiagram(cont)3-3
3-2Addressdecoding3-7
3-3Front-panelswitchmatrix3-12
3-4Scaleilluminationcircuit3-16
3-5Sweepgenerator3-22
3-6Developingthereadoutdisplay3-28
3-7Readoutdisplaypriorities3-32
3-8TimingofRefreshPrioritizer3-33
3-9Dcrestorercircuit(2465Bonly)3-38
3-10Dcrestorercircuit(2467Bonly)3-43
3-11TimingrelationshipsoftheInverterDrivesignals3-48
3-12Simplifiedschematicofcontrolnetwork3-49
6-1MultipinConnectorOrientation6-6
6-2RibbonCableRemoval6-26
6-3PowerSwitchPushButtonDisassembly6-31
10-1Colorcodesforresistorsandcapacitors.
10-2Semiconductorleadconfigurations.
10-3Locatingcomponentsonschemcaticdiagramsandcircuitboardillustrations.
10-4Instrumentblockdiagram.
10-5A5—Controlboard.
10-6A6—FrontPanelboard.
10-7A1—MainandA8—ScaleIlluminationboards.
10-8A15—Holdoffboard.
10-9A14—DynamicCenteringboard.
10-10A4—Readoutboard.
10-11A9—2467BHighVoltageboard.
10-12A9—2465BHighVoltageboard.
10-13A2—RegulatorandA3—Inverterboards.
in

2465B/2467BService
LISTOFTABLES
TablePage
1-12465B/2467B ElectricalCharacteristics1-2
1-2Option06(C/T/T)ElectricalCharacteristics1-13
1-3ResolutionSelections1-19
1-4ResolutionSelections1-19
1-5Option09(WR)ElectricalCharacteristics1-20
1-62465BMechanicalCharacteristics1-21
1-72467BMechanicalCharacteristics1-22
1-8EnvironmentalRequirements1-23
2-1PowerCordandVoltageData2-3
(ForSNB050000& Above)
3-1IntensityControl3a-19
3-2TriggerSourceSelection3a-21
3-3VerticalDisplaySelection3a-24
3-4HorizontalDisplaySelection3a-26
3-5BlankingandIntensityControlSelection3a-27
3-6ReadoutDisplayModeSelection3a-31
3-7OperationofPrioritizerShiftRegister3a-32
(ForSNB049999& Below)
3-1IntensityControl3-19
3-2TriggerSourceSelection3-21
3-3VerticalDisplaySelection3-24
3-4HorizontalDisplaySelection3-26
3-5BlankingandIntensityControlSelection3-27
3-6ReadoutDisplayModeSelection3-31
3-7OperationofPrioritizerShiftRegister3-32
4-1TestEquipmentRequired4-2
4-2AccuracyLimits4-7
4-3AccuracyLimits4-9
4-4CH3 andCH4 AccuracyLimits4-11
4-5CH1 orCH2 TriggeringConditions4-16
4-6CH3 orCH4 TriggeringConditions4-17
4-7SettingsforA andB TimingAccuracyChecks4-22
4-8HorizontalTimingAccuracyCheckedAgainsttheGraticule4-23
4-9DeltaTimeDisplayAccuracy4-25
4-10DelayedSweepDeltaTimeAccuracy4-26
4-11ParametricMeasurementPeriodChecks4-27
4-12ParametricMeasurementVoltsChecks4-28
4-13DataSetupTimeChecks4-41
4-14DataHoldTimeChecks4-42
4-15MinimumClockPulseWidthChecks4-42
4-16DelayFromSelectedEdgetoWORDRECOGOUTChecks4-43
4-17WordRecognitionDelay4-43
5-1PowerSupplyVoltage andRippleTolerances5-3
5-2HorizontalTiming5-15
5-3HorizontalTiming5-16
5-4VerticalCalibrationSignals5-17
5-5VerticalCalibrationSignals5-17
5-6ParametricMeasurementCalibration5-23
iv

2465B/2467BService
LISTOFTABLES(cont)
1SusceptibilitytoStaticDischargeDamage6-1
2ExternalInspectionCheckList6-2
3InternalInspectionCheckList6-3
4SequenceofDiagnosticTests6-11
5SequenceofExerciserRoutines6-13
6KernelTestFailureCodes6-13
7Front-PanelLEDOptionCodes6-13
8Front-PanelLEDDeviceCodes6-14
9PotentiometerCodesandValues(Exerciser01)6-16
10PotsandSwitchesColumn6-17
11NOPTestData6-19
12MaintenanceAids6-21
v

2465B/2467BService
OPERATORSSAFETYSUMMARY
The general safety information in this part of the summary is for both operating and servicing personnel.
Specific warnings and cautions will be found throughout the manual where they apply and do not appear in this
summary.
TermsinThisManual
CAUTIONstatementsidentifyconditionsorpracticesthat
couldresultindamagetotheequipmentorotherproperty.
WARNINGstatementsidentifyconditionsorpracticesthat
couldresultinpersonalinjuryorlossoflife.
TermsasMarkedonEquipment
CAUTIONindicatesa personalinjuryhazardnotimmedi-
atelyaccessibleasonereadsthemarkings,ora hazardto
property,includingtheequipmentitself.
DANGERindicatesa personalinjuryhazardimmediately
accessibleasonereadsthemarking.
SymbolsinThisManual
A Thissymbolindicateswhereapplicable
cau-
tionaryorotherinformationistobefound.For
maximuminputvoltageseeTable1-1.
SymbolsasMarkedonEquipment
GroundingtheProduct
Thisproductisgroundedthroughthegroundingconductor
ofthepower cord. Toavoidelectricalshock,plugthe
powercordintoa properlywiredreceptaclebeforemaking
anyconnectionstotheproductinputoroutputterminals.
Aprotectivegroundconnectionbywayofthegrounding
conductorinthepowercordisessentialforsafeoperation.
DangerArisingfromLossofGround
Uponlossoftheprotective-ground connection,allaccessi-
bleconductiveparts(includingknobsandcontrolsthat
mayappeartobeinsulated)canrenderanelectricshock.
UsetheProperPowerCord
Useonlythepowercordandconnectorspecifiedforyour
product.
Useonlya powercordthatisingoodcondition.
Fordetailedinformationonpowercordsandconnectors,
seeTable2-1.
DANGER— Highvoltage.
Protectiveground(earth)terminal.
UsetheProperFuse
Toavoidfirehazard,useonlya fuseofthecorrecttype,
voltageratingandcurrentratingasspecifiedintheparts
listforyourproduct.
A ATTENTION— Refertomanual.
PowerSource
Thisproductisintendedtooperate froma powersource
thatwillnotapplymorethan250voltsrmsbetweenthe
supplyconductorsorbetweeneithersupplyconductorand
ground. A protectivegroundconnectionbywayofthe
groundingconductorinthepowercordisessentialforsafe
operation.
DoNotOperateinExplosiveAtmospheres
Toavoidexplosion,donotoperate thisinstrumentinan
explosiveatmosphereunlessithasbeenspecifically
certifiedforsuchoperation.
DoNotRemoveCoversorPanels
Toavoidpersonalinjury,donotremovetheproductcov-
ersorpanels.Donotoperate theinstrumentwithoutthe
coversandpanelsproperlyinstalled.
VI