Tektronix 2232 Service Manual

Tektronix 7 Service Manual 2232 Digital Storage Oscilloscope Serial Numbers B010100 to B029999 070-7067-01 Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to the Safety Summary prior to performing service. Please check for change information at the rear of this manual. First Printing: June 1992

Copyright E Tektronix, Inc. 1989, 1992. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 970701000 TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product. In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations. This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product. THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

LISTOFILLUSTRATIONS LISTOFTABLES OPERATORSSAFETYSUMMARY SERVICINGSAFETYSUMMARY 2232Service TABLEOFCONTENTS SPECIFICATION INTRODUCTION............. ACCURACYAND RESOLUTION................ STANDARDACCESSORIES.... PERFORMANCE CONDITIONS................ OPERATINGINFORMATION POWERCORD............... LINEFUSE.................. INSTRUMENTCOOLING....... START-UP..............004. REPACKAGING.............. THEORYOFOPERATION SECTIONORGANIZATION..... INTEGRATEDCIRCUIT DESCRIPTIONS.............. GENERALDESCRIPTION...... DETAILEDCIRCUIT DESCRIPTION................. INTRODUCTION............. VERTICALATTENUATORS..... VERTICALPREAMPLIFIERS.... VERTICALOUTPUT AMPLIFIER................. TRIGGERING............... ASWEEPGENERATORAND BTIMINGANDALTERNATE BSWEEP.................. HORIZONTAL.........-..--. MICROPROCESSOR......... STATUSADCANDBUS INTERFACE................ Page STORAGEACQUISITION.....3-29 DIGITALTIMEBASE.........3-30 DIGITALDISPLAY............3-31 VECTORGENERATOR.......3-33 DIGITALACQUISITIONAND MEMORY.............2005-3-34 POWERINPUT,PREREGULATOR ANDINVERTER.............3-35 POWERSUPPLYSECONDARIES, Z-AXISANDCRT............3-38 X-YPLOTTER..............3-41 PERFORMANCECHECK PROCEDURE INTRODUCTION...............4-1 PURPOSE..................4-1 PERFORMANCECHECK INTERVAL...............000-4-1 STRUCTURE................4-1 TESTEQUIPMENT REQUIRED..................4-1 LIMITSANDTOLERANCES.....4-1 PREPARATIONFORCHECKS...4-1 INDEXTOPERFORMANCE CHECKSTEPS...............4-3 VERTICAL.............2.-2.048.4-4 INITIALCONTROL SETTINGS..................4-4 PROCEDURESTEPS..........4-4 HORIZONTAL...........--.-654-10 INITIALCONTROL SETTINGS.................4-10 PROCEDURESTEPS.........4-10 TRIGGER..............0.0005-4-15 INITIALCONTROL SETTINGS...............-.4-15 PROCEDURESTEPS.........4-15 EXTERNALZ-AXIS,PROBEADJUST, EXTERNALCLOCK,ANDX-Y PLOTTER..........-.-.--0005-4-19 INITIALCONTROL SETTINGS.................4-19 PROCEDURESTEPS.........4-19

2232Service Section5 Section6 ADJUSTMENTPROCEDURE INTRODUCTION...............5-1 PURPOSE..................5-1 STRUCTURE................5-1 TESTEQUIPMENT REQUIRED..................5-1 LIMITSANDTOLERANCES.....5-1 ADJUSTMENTSAFFECTED BYREPAIRS.................5-1 PREPARATIONFOR ADJUSTMENT...............5-2 INDEXTOADJUSTMENT PROCEDURESTEPS..........5-3 POWERSUPPLYANDCRT DISPLAY..........0.0.0.eae5-4 INITIALCONTROL SETTINGS...............0..5-4 PROCEDURESTEPS..........5-4 VERTICAL..............-.--04-5-6 INITIALCONTROL SETTINGS..................5-6 PROCEDURESTEPS..........5-6 HORIZONTAL.........-..-.--.5-15 INITIALCONTROL SETTINGS.................5-15 PROCEDURESTEPS.........5-15 TRIGGER....................5-21 INITIALCONTROL SETTINGS..............0..5-21 PROCEDURESTEPS.........5-21 MAINTENANCE STATIC-SENSITIVE COMPONENTS................6-1 PREVENTIVEMAINTENANCE.....6-2 INTRODUCTION.............6-2 GENERALCARE.............6-2 INSPECTIONANDCLEANING..6-2 LUBRICATION...............6-4 SEMICONDUCTORCHECKS...6-4 PERIODICREADJUSTMENT....6-5 TROUBLESHOOTING...........6-5 INTRODUCTION.............6-5 TROUBLESHOOTINGAIDS....6-5 TROUBLESHOOTING EQUIPMENT................6-10 Section7 Section8 Section9 TROUBLESHOOTING TECHNIQUES..............6-10 DIAGNOSTICS..............6-15 CORRECTIVEMAINTENANCE...6-22 INTRODUCTION............6-22 MAINTENANCE PRECAUTIONS.............6-22 OBTAININGREPLACEMENT PARTS.......0.cee ceceeees6-22 MAINTENANCEAIDS........6-22 INTERCONNECTIONS........6-24 LITHIUMBATTERY(BT1101)...6-24 TRANSISTORSAND INTEGRATEDCIRCUITS......6-24 SOLDERINGTECHNIQUES...6-24 REMOVALANDREPLACEMENT INSTRUCTIONS.............6-26 OPTIONS INTRODUCTION...............7-1 OPTIONSDESCRIPTION........7-1 INTERNATIONALPOWERCORD OPTIONS...........0..0000-7-1 OPTION10.........00.. 0000.7-1 OPTION12.........0..00000-7-1 OPTION33..........0..0000 8:7-1 SERVICINGINFORMATION.......7-1 OPTION10THEORYOF OPERATION.............-0-7-1 OPTION12THEORYOF OPERATION..............0--7-3 PERFORMANCECHECK PROCEDURE................7-4 ADJUSTMENTPROCEDURE...7-6 OPTIONMAINTENANCE INFORMATION...........-..-7-6 REPLACEABLEELECTRICALPARTS DIAGRAMS Section10REPLACEABLEMECHANICALPARTS CHANGEINFORMATION

2232Service LISTOFILLUSTRATIONS FigurePage The2232OscillOSCOPe...1...ee eeeeensviii 1-1MaximuminputvoltageversusfrequencyderatingcurvefortheCH1ORX, CH2ORY,andEXTINPUTconnectors.........0.0.00.ceeeee1-17 1-2Physicaldimensionsofthe2232Oscilloscope......0.0.0...eeeeee1-18 2-1Securingthedetachablepowercordtotheinstrument............ 0.0...eeeeee2-1 2-2OptionalpowerCOMdS.......eee eeetenes2-2 3-1Simplifiedblockdiagram.....6... eeeeeeeens3-2 3-2BlockdiagramoftheChannel1Attenuatorcircuit...2.0.2... eee3-8 3-3Store/Non-StoreVerticalSwitching.........0..000. 00.cccceeeee3-11 3-4BlockDiagramoftheTriggerAmplifiersandSwitching................. 0.ceceeee3-14 3-5ASweepGeneratorandLogicCircuitry1.0.00... .eeeeee3-18 3-6BSweepGeneratorandLogiccircuitry......0... eee3-21 3-7HorizontalAmplifierblockdiagram...........0.0...ees3-25 3-8PowerSupplyblockdiagram....2.0...eeeteens3-36 3-9SimplifieddiagramoftheDcRestorercircuitry........... 00.0.eeeeeeeee3-40 6-1Multi-connectorholderorientation.........2... eee6-7 6-2GroundingthesignallinesofP2111andP2112«1...ee eee6-7 6-3IsolatedKerneltiming..........20.0....eeeneeteens6-8 6-4DiagnosticMenuMap...........2...eeeentenes6-16 6-5LocationofscrewsandspacersontheStorageCircuitboard................046.6-28 6-6Recessedscrewandrearhingeremoval........... 2.0.0ceeeeeeee6-29 6-7LocationofscrewssecuringPowerSupplyshieldandthesupportbrackettothe rearChassisfraMe..2...eeteeeeeeens6-31 9-1Colorcodesforresistorsandcapacitors 9-2Semiconductorleadconfigurations 9-3Locatingcomponentsonschematicdiagramsandcircuitboardillustrations 9-4Detailedanalogblockdiagram 9-5Detailedstorageblockdiagram 9-6A2—Attenuatorboard 9-7A14—CH1Logicboard 9-8A1i5—CH2Logicboard 9-9A1—Mainboard 9-10CircuitViewofAl—Mainboard 9-11A1A8—CH1BandwidthLimitboard 9-12A1A9—CH2BandwidthLimitboard 9-13A3—FrontPanelboard 9-14CircuitviewofA3—FrontPanelboard 9-15A4—Timingboard 9-16A13—SweepInterfaceboard 9-17A5S—AlternateSweepboard

2232Service 9-18 9-19 9-20 9-21 9-22 9-23 9-24 9-25 9-26 9-27 9-28 9-29 9-30 9-31 A16—SweepReferenceboard A6—EMIFilterboard A1A18—ThermalShutdownboard A31—ScaleIllumboard A10—Storageboard A20—XYPlotterboard A21—RS-232Optionboard A22—GPIBOptionboard A1—Mainboardadjustmentlocations A2—Attenuatorboardadjustmentlocations A4—Timingboardadjustmentlocations A5—AltSweepLogicboardadjustmentlocations A16—SweepReferenceboardadjustmentlocations A10—Storageboardadjustmentlocations

2232Service LISTOFTABLES TablePage 1-1ElectricalCharacteristics......0.0... eeeens1-3 1-2EnvironmentalCharacteristics....0.0.0....ceeeeeeteens1-15 1-3PhysicalCharacteristics.........0.0...eee eens1-17 3-1MemorySpaceAllocation.........0.0...ce eeeeee3-28 4-1TestEquipmentRequired........0... eetenes4-2 4-2DeflectionAccuracyLimits..........0...0ceeeeteens4-4 4-3StorageDeflectionAccuracy........0.0...beeen ene4-5 4-4SettingsforBandwidthChecks........0...2.eteeens4-6 4-5SettingsforTimingAccuracyChecks.....0.0...cee eeeee4-11 4-6SettingsforDelayTimeDifferentialChecks.......... 0.2...0.ceeeeeeee4-13 4-7SwitchCombinationsforATriggeringChecks........... 0...0cceeeee4-15 5-1AdjustmentsAffectedbyRepairs.....eee tneeeeeeeeee5-2 5-2PowerSupplyLimits........0.0.0.eee5-4 5-3DeflectionAccuracyLimits.........0...eee nee5-8 5-4StoreDeflectionAccuracy........0.6...cetees5-10 5-5AttenuatorCompensationAdjustments..........0.000...eeeees5-11 5-6SettingsforBandwidthChecks.............0 0.teeneee5-13 5-7SettingsforTimingAccuracyChecks........... 0.0...eeeeee5-18 5-8SettingsforDelayTimeDifferentialChecks............ 0.0.0.0.ceeeecece5-19 6-1RelativeSusceptibilitytoStatic-DischargeDamage...............-.. 0ceeee6-1 6-2ExternalInspectionChecklist........00.002eeeeetenes6-2 6-3InternalInspectionChecklist...........00...ceeeeetees6-3 6-4ATimingSwitchInterfaceVoltages.....0.0...ceeeee6-9 6-4BTimingSwitchInterfaceVoltages..2... eteeens6-10 6-5VerticalVOLTS/DIVInterfaceVoltages....0... eeeee6-11 6-6ACGNDDCSwitchInterfaceVoltages............. 0...ceeeee6-11 6-7ProbeCoding...1...6.ccneeeeeeeeee6-12 6-8PowerSupplyVoltageandRippleLimits.........0...0.eee eeeee6-13 6-9DiagnosticTestsandMessages......2...teens6-15 6-10ErrorCodesforPUTest.........0...eeeeeeeeeee6-18 6-11DisplayFormatforFrontPanelIOExerciser.......... 2.0.0...eeececeeee6-19 6-12OutputPortsExerciser...0.00.00... eeeeeeeeens6-20 6-13MaintenanceAidS.........0.0... eeeens6-23 7-1GPIBStatusBufferFunctions..........00.0.0eee eens7-3 7-2RS-232-CStatusBufferFUNCTIONS...2... eee7-4 7-3TestEquipmentRequired...........20.0... eeeens7-5

2232Service OPERATORSSAFETYSUMMARY Thesafetyinformationinthissummaryisforoperatingpersonnel.Warningsandcautionswillalsobefoundthroughout themanualwheretheyapply. TermsinThisManual CAUTIONstatementsidentifyconditionsorpractices thatcouldresultindamagetotheequipmentorother property. WARNINGstatementsidentifyconditionsorpractices thatcouldresultinpersonalinjuryorlossoflife. TermsasMarkedonEquipment CAUTIONindicatesapersonalinjuryhazardnotimmediatelyaccessibleasonereadsthemarkings,orahazard toproperty,includingtheequipmentitself. DANGERindicatesapersonalinjuryhazardimmediately accessibleasonereadsthemarking. SymbolsinThisManual Thissymbolindicateswhereapplicable cautionaryorotherinformationisto befound.Formaximuminputvoltage seeTable1-1. SymbolsasMarkedonEquipment yDANGER—Highvoltage. a)Protectiveground(earth)terminal. AATTENTION—Refertomanual. PowerSource Thisproductisintendedtooperatefromapowersource thatdoesnotapplymorethan250Vrmsbetweenthe supplyconductorsorbetweeneithersupplyconductor andground.Aprotectivegroundconnection,bywayof thegroundingconductorinthepowercord,isessential forsafeoperation. vi GroundingtheProduct Thisproductisgroundedthroughthegroundingconductorofthepowercord.Toavoidelectricalshock,plugthe powercordintoaproperlywiredreceptaclebeforemak- inganyconnectionstotheproductinputoroutputtermi- nals.Aprotectivegroundconnection,bywayofthe groundingconductorinthepowercord,isessentialfor safeoperation. DangerArisingFromLossofGround Uponlossoftheprotective-groundconnection,allaccessibleconductiveparts,includingknobsandcontrols thatmayappeartobeinsulating,canrenderanelectric shock. UsetheProperPowerCord Useonlythepowercordandconnectorspecifiedfor yourproduct. Useonlyapowercordthatisingoodcondition. Fordetailedinformationonpowercordsandconnectors,seeFigure2-2. UsetheProperFuse Toavoidfirehazard,useonlyafuseofthecorrecttype, voltageratingandcurrentratingasspecifiedintheparts listforyourproduct. DoNotOperateinanExplosive Atmosphere Toavoidexplosion,donotoperatethisinstrumentinan explosiveatmosphere. DoNotRemoveCoversorPanels Toavoidpersonalinjury,donotremovetheproductcoversorpanels.Donotoperatetheproductwithoutthe coversandpanelsproperlyinstalled.

Tektronix 2232 Service Manual

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