HP 85662A Operating instructions

TroubleshootingandRepairManual
HP85662ASpectrumAnalyzerIF-DisplaySection
Wj/Sl HEWLETT
WMM PACKARD
HPPartNo.85662-90085MicrofichePartNo.85662-90086
PrintedinUSADecember1990

@CopyrightHewlett-PackardCompany1990
AllRightsReserved.Reproduction,adaptation,ortranslationwithoutpriorwritten
permissionisprohibited,exceptasallowedunderthecopyrightlaws.
1212ValleyHouseDrive,RohnertPark,CA94928-4999,USA

Certification
Hewlett-PackardCompanycertifiesthatthisproductmetitspublishedspecificationsatthe
timeofshipmentfromthefactory.Hewlett-Packardfurthercertifiesthatitscalibration
measurementsaretraceabletotheUnitedStatesNationalInstituteofStandardsand
Technology,totheextentallowedbytheInstitute’scalibrationfacility,andtothecalibration
facilitiesofotherInternationalStandardsOrganizationmembers.
Warranty
ThisHewlett-Packardinstrumentproductiswarrantedagainstdefectsinmaterialand
workmanshipfora periodofoneyearfromdateofshipment.Duringthewarrantyperiod,
Hewlett-PackardCompanywill,atitsoption,eitherrepairorreplaceproductswhichproveto
bedefective.
Forwarrantyserviceorrepair,thisproductmustbereturnedtoa servicefacilitydesignated
byHP.BuyershallprepayshippingchargestoHPandHPshallpayshippingchargesto
returntheproducttoBuyer.However,Buyershallpayallshippingcharges,duties,andtaxes
forproductsreturnedtoHPfromanothercountry.
HPwarrantsthatitssoftwareandfirmwaredesignatedbyHPforusewithaninstrument
willexecuteitsprogramminginstructionswhenproperlyinstalledonthatinstrument.HP
doesnotwarrantthattheoperationoftheinstrument,orsoftware,orfirmwarewillbe
uninterruptedorerror-free.
LimitationofWarranty
Theforegoingwarrantyshallnotapplytodefectsresultingfromimproperorinadequate
maintenancebyBuyer,Buyer-suppliedsoftwareorinterfacing,unauthorizedmodificationor
misuse,operationoutsideoftheenvironmentalspecificationsfortheproduct,orimproper
sitepreparationormaintenance.
NOOTHERWARRANTYISEXPRESSEDORIMPLIED.HPSPECIFICALLY
DISCLAIMSTHEIMPLIEDWARRANTIESOFMERCHANTABILITYANDFITNESS
FORA PARTICULARPURPOSE.
ExclusiveRemedies
THEREMEDIESPROVIDEDHEREINAREBUYER’SSOLEANDEXCLUSIVE
REMEDIES.HPSHALLNOTBELIABLEFORANYDIRECT,INDIRECT,SPECIAL,
INCIDENTAL,ORCONSEQUENTIALDAMAGES,WHETHERBASEDON
CONTRACT,TORT,ORANYOTHERLEGALTHEORY.
Assistance
Product maintenance agreements and other customer assistance agreements are available for
Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard SalesandServiceOffice.
iff

SafetySymbols
Thefollowingsafetysymbolsareusedthroughoutthismanual.Familiarizeyourselfwitheach
ofthesymbolsanditsmeaningbeforeoperatingthisinstrument.
Caution
•
Thecaution signdenotesa hazard.Itcallsattentiontoa procedurewhich,
ifnotcorrectlyperformedoradheredto,couldresultindamagetoor
destructionoftheinstrument.Donotproceedbeyonda caution signuntilthe
indicatedconditionsarefullyunderstoodandmet.
Warning
0 Thewarning signdenotesa hazard.Itcallsattentiontoa procedurewhich,
ifnotcorrectlyperformedoradheredto,couldresultininjuryorlossoflife.
Donotproceedbeyonda warning signuntiltheindicatedconditionsarefully
understoodandmet.
GeneralSafetyConsiderations
Warning
0 Before this instrument is switched on, makesureithasbeenproperlygrounded
throughtheprotectiveconductoroftheacpowercabletoa socketoutlet
providedwithprotectiveearthcontact.
Anyinterruptionoftheprotective(grounding)conductor,insideoroutside
theinstrument,ordisconnectionoftheprotectiveearthterminalcanresultin
personalinjury.
WarningTherearemanypointsintheinstrumentwhichcan,ifcontacted,causepersonal
injury.Beextremelycareful.
9Anyadjustmentsorserviceproceduresthatrequireoperationoftheinstrument
withprotectivecoversremovedshouldbeperformedonlybytrainedservice
personnel.
Caution
•
Before this instrument is switched on, makesureitsprimarypowercircuitry
hasbeenadaptedtothevoltageoftheacpowersource.
Failuretosettheacpowerinputtothecorrectvoltagecouldcausedamageto
theinstrumentwhentheacpowercableispluggedin.

Contents
IF-DisplaySectionGeneralinformationonthecontentsofthemanual,includingstorage,
GeneralInformationshipment,andpackaging.
IFOverallBlockMnemonicTable,InstrumentBusPinConnectionTable,andOverall
DiagramIFBlockDiagram.
AlDisplaySectionAlDisplaySectionTroubleshootinginformation,BlockDiagram,and
A1A1throughA1A10servicesheets.
A3DigitalStorageA3DigitalStorageTroubleshootinginformation,BlockDiagram,and
TroubleshootingA3A1throughA3A10servicesheets.
A4IFSectionA4SectionBlockDiagram,andA4A1throughA4A10servicesheets.
Troubleshooting
OptionsInformationandservicesheetsthatexplainthedifferencebetweenan
IF-DisplaySectionwithanoptionanda standardIF-DisplaySection.
GeneralPartsListingReplaceablepartsinformationandpartsidentificationfigures.
MajorAssemblyandMajorassemblyandcomponentlocations.
ComponentLocations
Contents1

IF-DisplaySectionGeneralInformation
IF-DisplaySectionService
Introduction
ThisTroubleshootingandRepairManualcontainsinformationfor thetroubleshootingand
repairoftheIF-DisplaySectionoftheinstrument.Thisinformationiscombinedinservice
sheetsandindexedwithtabsforquickreference.
InstrumentsCoveredbyThisManual
-HP85662AIF-DisplaySections,serialnumberprefixes2403Aandabove.
-Option067(1kHzto3 MHzResolutionBandwidthsfortheHP8567ASpectrumAnalyzer),
■Option400(400Hzoperation)
-Option462(ImpulseBandwidths)
-OptionH96(30Hz-lMHzResolutionBandwidths)
HP85662AIF-DisplaySectionswithserialnumberprefixesbelow24038arecoveredinboth
Volume3 oftheHP8566AOperatingandServiceManual(HPpartnumber08566-90006)and
Volume3 oftheHP85688OperatingandServiceManual(HPpartnumber08568-90012).
HowtheHP85662AIsUsed
-HP85662AIF-DisplaySectionisusedwith:
□HP85660BRFSectionastheHP8566BSpectrumAnalyzer
□HP85680BRFSectionastheHP8568BSpectrumAnalyzer.
■Option462isusedwith:
□HP85660BRFSectionastheHP8566BOption462SpectrumAnalyzer
□HP85680BRFSectionastheHP8568BOption462SpectrumAnalyzer
-Option067isusedwith:
□HP856708RFSectionastheHP85678SpectrumAnalyzer
-OptionH96isusedwith:
•I HP85680BOptionH96astheHP8568BOptionE96SpectrumAnalyzer
oHP85680BOptionH44astheHP8568BOptionE44SpectrumAnalyzer.
IF-DisplaySectionGeneralInformation1

ServiceSheets
Theservicesheetsinthismanualareorganizedinalpha-numericorderandareindexedwith
tabstomakeiteasytolocatea specificservicesheet.Eachoftheservicesheetscontainthe
followinginformation:
■CircuitDescription(wherepractical)
■TroubleshootingHints(wherepractical)
-ReplaceablePartsLists
■BlockDiagram(wherepractical)
-ComponentLocationIllustrations
-SchematicDiagrams
RepairProcedures
Repairproceduresareincludedforuseinremovingandreplacingassembliesforrepair.They
arelocatedinthefollowingsections:
■Front-PanelLEDReplacement
Tab: AlAlKeyboard
■FrontPanelRemovalandRepair
Tab: AlAlKeyboard
-CRTReplacement
Tab: A1A3HighVoltageRegulator
■IF-DisplaySectionInternalFuseReplacement
Tab: A1A6±15V RegulatorandHighVoltage
MajorAssemblyandComponentLocations
MajorassemblyandcomponentlocationillustrationsfortheIF-Sectionarelocatedattherear
ofthismanual.
Troubleshooting
TroubleshootinginformationfortheIF-Sectionisdividedintotwolevelsasfollows:
-SectionLevel
IFOverallBlockDiagrarn
AlDisplaySectionBlockDiagram
A3DigitalStorageTroubleshooting
A4IF-SectionTroubleshooting
-AssemblyLevel
Mostassemblieshavetroubleshootinghintsimmediatelyfollowingtheircircuit
descriptions.Troubleshootinginformationisalsolocatedonassembly-levelblock
diagrams,notes,andschematics.
2If-DisplaySectionGeneralInformation

AllassembliesareindexedbytabexceptfortheoneslistedinTable1 attheendofthis
section.Table1 liststheindextabswheretheseassembliescanbefound.
AssemblyLocations
IAssembly| TabLocationI
A1T1
A1V1
A1A11
A2
A1A8Rectifier,BlockDiagram
GeneralPartsListing,Table6
A1A3HighVoltageRegulator,BlockDiagram
GeneralPartsListing,Table6
A1A3HighVoltageRegulator,BlockDiagram
GeneralPartsListing,Table4
NotAssigned
StorageandShipment
Environment
Theinstrumentmaybestoredorshippedinenvironmentswithinthefollowing limits:
Temperature-40°Ct o +75°C
Humidity ...............................................m\5%
t 0 90%at0°to40°C
Altitude.Upto15,240meters(50,000feet)
Theinstrumentshouldbeprotectedfromtemperatureextremeswhichmightcause
condensationwithintheinstrument.
OriginalPackaging
Itisrecommendedthattheoriginalfactorypackagingmaterialsberetainedforusewhen
shippingtheinstrument.Iforiginalpackagingmaterialcannotberetained,packaging
materialsidenticaltothoseusedinfactorypackagingareavailablethroughHewlett-Packard
offices.PartnumbersanddescriptionsofthepackagingmaterialsarelistedinFigure1.
Thecombinedweightofthetwoinstrumentsectionsisapproximately50kg(112lbs).
Becauseoftheweightinvolved,donotpackagetheinstrumentsectionsfastenedtogetheras
oneunit.Theinstrumentsectionsmustbeseparatedandpackagedinseparatecontainers.
ThequantityofpackagingmaterialsinFigure1 isforonlyoneinstrumentsection.
IftheinstrumentisbeingreturnedtoHewlett-Packardforservicing,attacha tagtoeach
cartonindicatingthetypeofservicerequired,returnaddress,modelnumber,andfullserial
number.Foryourconvenience,a supplyoftagsisincludedattheendofthissection.Also,
markeachcontainerFRAGILEtoassurecarefulhandling.Inanycorrespondence,refertothe
instrumentbymodelnumberandfullserialnumber.
OtherPackaging
Ifitisnecessarytousepackagingmaterialsotherthanthetypeusedinoriginalfactory
packaging,thefollowinggeneralinstructionsshouldbefollowed.
IF-DisplaySectionGeneralInformation3

1. Separatethetwoinstrumentsectionsandwrapeachinheavypaperorplastic.
2. Placetheinstrumentsectionsinseparatecontainerswith8 to10cm(3to4 inches)of
shock-absorbingmaterialaroundallsidestoprovidefirmcushioningandpreventmovement
insidethecontainer.Protectfrontpanelswithcardboard.Double-wallcorrugatedcartons
of125kg(275lb)burstingstrengtharesufficientforshippingcontainers.
3. Sealeachcontainersecurelyand,ifshippingtoa Hewlett-Packardofficeorservicecenter,
attacha tagtoeachcontainerindicatingthetypeofservicerequired,returnaddress,model
number,andfullserialnumber.Foryourconvenience,a supplyoftagsisincludedatthe
endofthissection.
4. MarkeachcontainerFRAGILEtoassurecarefulhandling.
ITEM QTY
1
2
1
HPPARTNO.
9211-4487
5180-2319
5180-2320
DESCRIPTION
OUTERBOX
INNERFOAMPAD
INNERBOX
Figure1.PackagingforShipmentUsingFactoryPackagingMaterials
4IF-DisplaySectionGeneralInformation

IFOverallBlockDiagram
Table1.A3DigitalStorageMnemonic Table
Mnemonic Description Mnemonic Description
18.4MHZLO
[MHZ
21.4MHZ
3MHZ
ALOG
AO- All
AlOdB
A20dB
A2dB
A4dB
A.8dB
AJDRO
ADR3
kUX BLANK
<OJXZ
WdB
BLOG
BO- Bll
BLO- BL6
BLINK
BRIGHT
BS
BWS
BW63
BW68
BW7
2HAR
3LK
18.4MHzLocalOscillatorSignal
1MHzADCClock
21.4MHzIFSignal
3MHzIFSignal
LogExpandControl
AccumulatorBusBits0 through11
AttenuationControls
InstrumentBusAddressBits0 through3
AuxiliaryBlankingOutput
AuxiliaryZ AxisOutput
AttenuationControl
LogExpandControl
DigitalStorageBusDataBits0 through11
BranchLengthBusBits0 through6
BlinkCRTDisplayControl
BrightCRTDisplayControl
BlockSwitchControl
BandwidthControls
MemoryChipEnable
CharacterModeDisplayControl
8MHzSystemClock
LDRMP
LDSR
LDX
LDY
LFSEN
LG10
LG20
LGCLK
LGX
LGY
LINCRSA
LINTG
LL
LLGBLANK
LLL
LMEMEN
Log/LinearControl
LQ
LROMEN
LRSTO
LRTN
LRTRC
LT10
LTON
LTSTA
LTSTB
LWRITE
LZERO
MA0-MA11
LoadRampRegister
LOW= DigitalStorageReady
LoadX PositionRegister
LoadY PositionRegister
LOW= FastSweepEnable
LinearGainControls
200kHzLineGeneratorClock
LineGeneratorHorizontalSignal
LineGeneratorVerticalSignal
IncrementStrokeAddress
LOW= IntegratorControl
LongLine
LOW= LineGeneratorBlankingControl
LOW= LongLine
LOW= EnableMemoryOutput
LOW= SelectedQualifier
LOW= ROMEnable
LOW= ResetTriggerOccurred
LOW= EnableInterruptReturn
LOW= RetraceSignal
LOW=IF-DisplaySection1/0Strobe
LOW= TurnOn
LOW= InputTestA Data
LOW= InputTestB Data
MemoryWriteControl
OutputofZeroCheckonALUResult
MemoryAddressBusBits0 through11
IFOverallBlockDiagram