1740A Series, 1750A Series, & 1760 Series Waveform/Vector Monitors S/N B020000 and Above ...

350 Pages·2003·4.93 MB·English

by  Tektronix, Inc.

Service Manual
1740A Series, 1750A Series, & 1760 Series
Waveform/Vector Monitors
S/N B020000 and Above
070-8469-03
Thisdocumentappliestofirmwareversion2.00
andabove.
Warning
Theservicinginstructionsareforusebyqualified
personnelonly.Toavoidpersonalinjury,donot
performanyservicingunlessyouarequalifiedto
doso.Refertoallsafetysummariespriorto
performingservice.
www.tektronix.com
Copyright©Tektronix,Inc.Allrightsreserved.
TektronixproductsarecoveredbyU.S.andforeignpatents,issuedandpending.Informationinthispublicationsupercedes
thatinallpreviouslypublishedmaterial.Specificationsandpricechangeprivilegesreserved.
Tektronix,Inc.,P.O.Box500,Beaverton,OR97077
TEKTRONIXandTEKareregisteredtrademarksofTektronix,Inc.
WARRANTY
Tektronixwarrantsthattheproductsthatitmanufacturesandsellswillbefreefromdefectsinmaterialsand
workmanshipforaperiodofthree(3)yearsfromthedateofshipment.Ifaproductprovesdefectiveduringthis
warrantyperiod,Tektronix,atitsoption,eitherwillrepairthedefectiveproductwithoutchargeforpartsandlabor,
orwillprovideareplacementinexchangeforthedefectiveproduct.
Inordertoobtainserviceunderthiswarranty,CustomermustnotifyTektronixofthedefectbeforetheexpiration
ofthewarrantyperiodandmakesuitablearrangementsfortheperformanceofservice.Customershallbe
responsibleforpackagingandshippingthedefectiveproducttotheservicecenterdesignatedbyTektronix,with
shippingchargesprepaid.TektronixshallpayforthereturnoftheproducttoCustomeriftheshipmentistoa
locationwithinthecountryinwhichtheTektronixservicecenterislocated.Customershallberesponsiblefor
payingallshippingcharges,duties,taxes,andanyotherchargesforproductsreturnedtoanyotherlocations.
Thiswarrantyshallnotapplytoanydefect,failureordamagecausedbyimproperuseorimproperorinadequate
maintenanceandcare.Tektronixshallnotbeobligatedtofurnishserviceunderthiswarrantya)torepairdamage
resultingfromattemptsbypersonnelotherthanTektronixrepresentativestoinstall,repairorservicetheproduct;
b)torepairdamageresultingfromimproperuseorconnectiontoincompatibleequipment;c)torepairany
damageormalfunctioncausedbytheuseofnon-Tektronixsupplies;ord)toserviceaproductthathasbeen
modifiedorintegratedwithotherproductswhentheeffectofsuchmodificationorintegrationincreasesthetime
ordifficultyofservicingtheproduct.
THISWARRANTYISGIVENBYTEKTRONIXINLIEUOFANYOTHERWARRANTIES,EXPRESS
ORIMPLIED.TEKTRONIXANDITSVENDORSDISCLAIMANYIMPLIEDWARRANTIESOF
MERCHANTABILITYORFITNESSFORAPARTICULARPURPOSE.TEKTRONIX’
RESPONSIBILITYTOREPAIRORREPLACEDEFECTIVEPRODUCTSISTHESOLEAND
EXCLUSIVEREMEDYPROVIDEDTOTHECUSTOMERFORBREACHOFTHISWARRANTY.
TEKTRONIXANDITSVENDORSWILLNOTBELIABLEFORANYINDIRECT,SPECIAL,
INCIDENTAL,ORCONSEQUENTIALDAMAGESIRRESPECTIVEOFWHETHERTEKTRONIXOR
THEVENDORHASADVANCENOTICEOFTHEPOSSIBILITYOFSUCHDAMAGES.

Table of Contents
GeneralSafetySummary ................................... ix
ServiceSafetySummary .................................... xi
Preface ................................................... xiii
ContactingTektronix ............................................. xiv
Specifications
ProductDescription .............................................. 1--1
InputFormat .................................................... 1--13
Installation ..................................................... 2--1
StandardAccessories ............................................. 2--1
MechanicalInstallation ........................................... 2--2
ElectricalInstallation ............................................. 2--8
RearPanelConnectors ............................................ 2--9
RemoteConnector ............................................... 2--10
RemoteConnectorConverter ....................................... 2--12
RS232Connector ................................................ 2--13
InstallingSoftware ............................................... 2--14
LoadingSoftware ................................................ 2--16
CalibratingNewFeatures .......................................... 2--20
SpecialRecoveryforPowerLossDuringtheExecutionofUPGRADE ..... 2--20
Operating Information
GettingStarted .................................................. 2--23
OperatingInstructions ............................................ 2--24
GeneralMenuInformation ......................................... 2--25
FunctionalOverview ............................................. 2--27
DisplayingaSignal............................................... 2--29
Theory of Operation
Block DiagramDescription .................................. 3--1
BlockDiagram1:InputandWaveformMonitor ........................ 3--1
BlockDiagram2:Vector-- SCH-- Component ......................... 3--3
BlockDiagram3:MicroprocessorandLineRateController .............. 3--5
CircuitTheory ............................................ 3--7
Diagrams<1>and<2> ChannelAandChannelBInputs ............... 3--7
Diagram<3>VerticalInput ........................................ 3--8
Diagram<4>VerticalOutput ....................................... 3--10
Diagram<5>Horizontal .......................................... 3--11
Diagram<6>Microprocessor ...................................... 3--12
Diagram<7>DynamicControl ..................................... 3--14
Diagram<8>Readout ............................................ 3--15
Diagram<9>DACS&Serial ...................................... 3--16
Diagram<10>Remote&1760Series/XROMBusConnectors ........... 3--16
1740ASeries,1750ASeries,&1760SeriesServiceManual i
TableofContents
Diagram<11>Z-Axis&Control .................................... 3--17
Diagram<12>FrontPanel ......................................... 3--18
Diagram<13>DACs&DigitalControl .............................. 3--18
Diagram<14>SubcarrierRegenerator ............................... 3--19
Diagram<15>PhaseShifter ....................................... 3--21
Diagram<16>Demodulator ....................................... 3--22
Diagram<17>InternalSCH ....................................... 3--23
Diagram<18>ReferenceSCH ..................................... 3--26
Diagram<19>ComponentInputs,Transcoders,&RGBOutputs .......... 3--28
Diagram<20>ComponentControlandSwitching(1760SeriesOnly) ...... 3--30
Diagram<21>LowVoltagePowerSupply ............................ 3--32
Diagram<22>HighVoltsPowerSupply .............................. 3--35
Performance Verification
RecommendedEquipmentList ..................................... 4--1
PerformanceCheckProcedureShort-FormReference ................... 4--6
PerformanceCheckProcedure ...................................... 4--19
Adjustments
RequiredEquipment .............................................. 5--1
InitialSetup .................................................... 5--9
FunctionalDescriptionofPCDisplay ................................ 5--10
CircuitBoardAdjustmentLocations ................................. 5--12
WaveformIllustrations ............................................ 5--15
Maintenance
PreventingESD ................................................. 6--1
PreventiveMaintenance ........................................... 6--1
PerformanceChecksandAdjustments ................................ 6--2
InspectionandCleaning ........................................... 6--2
ReplacingtheLineFuse ........................................... 6--5
Troubleshooting ................................................. 6--5
CorrectiveMaintenance .................................... 6--12
CircuitBoards ................................................... 6--12
MechanicalDisassembly/Assembly .................................. 6--13
RemovingtheBezel .......................................... 6--13
ReplacingtheGraticuleLight ................................... 6--14
RemovingtheCRT ........................................... 6--16
RemovingtheRearPanel ...................................... 6--19
RemovingtheFrontPanelandtheFrontPanelCircuitBoard .......... 6--21
RemovingtheMainBoard ..................................... 6--22
RemovingthePowerSupplyBoard .............................. 6--24
RemovingtheVectorBoard .................................... 6--25
RemovingtheSCHBoard
(1750ASeries&1760SeriesOptionSConly) .............. 6--26
RemovingtheComponentBoard
(1760Seriesonly) ..................................... 6--26
Repackaging .................................................... 6--27
ii 1740ASeries,1750ASeries,&1760SeriesServiceManual
TableofContents
Options and Accessories
Options ........................................................ 7--1
StandardAccessories ............................................. 7--1
OptionalAccessories ............................................. 7--2
Replaceable Electrical Parts
PartsOrderingInformation......................................... 8--1
UsingtheReplaceableElectricalPartsList ............................ 8--1
Diagrams/Circuit Board Illustrations
Replaceable Mechanical Parts
PartsOrderingInformation......................................... 10--1
UsingtheReplaceableMechanicalPartsList .......................... 10--1
Glossary
Index
1740ASeries,1750ASeries,&1760SeriesServiceManual iii
TableofContents
List of Figures
Figure2--1:Dimensionsofthe1700F00plain cabinet ............ 2--2
Figure2--2:1700F02portablecabinet ......................... 2--3
Figure2--3:Rearviewshowingthesecuringscrews ............. 2--4
Figure2--4:TheWFM7F05side-by-siderack adapter ........... 2--5
Figure2--5:AWFM7F05with ablank frontpanel(1700F06) ..... 2--5
Figure2--6:WFM7F05rack mountcabinetwith a1700F07utility
drawer ............................................... 2--6
Figure2--7:Custominstallation ofan instrument ............... 2--7
Figure2--8:Rearpanelconnectors............................ 2--9
Figure2--9:RearpanelREMOTEconnector.................... 2--10
Figure2--10:Replacementadapterfor1740/1750 ............... 2--12
Figure2--11:RearpanelRS232connector ..................... 2--13
Figure2--12:Standard and alternatehookupsforthe9-pin
connector ............................................. 2--16
Figure2--13:Standard and alternatehookupsfor25-Pin PC
Connector ............................................. 2--17
Figure2--14:1760frontpanel ................................ 2--24
Figure2--15:TheCRTmenu,with thebezelcontrolsand buttons . 2--25
Figure3--1:NTSClinecount(U24)&colorframe1SCHfield pulse 3--26
Figure3--2:PALlinecount(U24)&colorframe1SCHfield pulse 3--27
Figure3--3:PinoutoftheCRTsocket ......................... 3--35
Figure4--1:ExternalHorizontalorRGB/YRGBCableAdapter ... 4--4
Figure4--2:RemoteSyncCableAdapter ...................... 4--5
Figure4--3:Audioand TimecodeCableAdapter ................ 4--5
Figure4--4:TimingCursorCheck ............................ 4--16
Figure4--5:FastDCRestorerResponse ....................... 4--24
Figure4--6:R--YDisplay .................................... 4--27
Figure4--7:AudioDisplay .................................. 4--33
Figure4--8:Option BlankingPulse ........................... 4--36
Figure4--9:BowtieCommon ModeRejection Ratio ............. 4--38
Figure5--1:Externalhorizontal/RGBand YRGBcableadapter ... 5--5
Figure5--2:Remotesynccableadapter ........................ 5--5
Figure5--3:Audioand TimecodeCableAdapter ................ 5--6
iv 1740ASeries,1750ASeries,&1760SeriesServiceManual
TableofContents
Figure5--4:RS232cablestandard and alternateconnectionsfor
9-pin PCconnector ..................................... 5--7
Figure5--5:RS232cablestandard and alternatehookupsfor
25-pin PCconnector .................................... 5--8
Figure5--6:TypicaladjustmentproceduresPCscreen display .... 5--10
Figure5--7:A1PowerSupplyboard .......................... 5--12
Figure5--8:A3Main board .................................. 5--12
Figure5--9:A5Vectorboard ................................. 5--13
Figure5--10:A6SCHboard ................................. 5--13
Figure5--11:A7Componentboard ........................... 5--14
Figure5--12:Adjustingforthinnestluminancestep ............. 5--15
Figure5--13:Matchingflatand luminancefilterresponses ....... 5--15
Figure5--14:AdjustingtheNTSCSCHon theoscilloscope ....... 5--16
Figure5--15:MatchingtheSCHdotflippingpoints ............. 5--16
Figure5--16:Adjustingtheoption blankingpulse ............... 5--17
Figure5--17:AdjustingforminimumBowtieamplitude .......... 5--17
Figure5--18:AdjustingDiamond displayphase ................. 5--18
Figure6--1:Instrumentetched circuitboard assemblies .......... 6--12
Figure6--2:RemovingtheCRTbezel ......................... 6--13
Figure6--3:Replacinggraticulelightbulbs .................... 6--15
Figure6--4:RemovingtheCRT .............................. 6--17
Figure6--5:Removingtherearpaneland Input/BNCassembly ... 6--20
Figure6--6:DisassemblingInput/BNCassemblyA4/A4--A1....... 6--20
Figure6--7:Removingthefront--panelassembly ................ 6--21
Figure6--8:FrontPanelcircuitboard assembly................. 6--22
Figure6--9:ScrewsholdingtheMain circuitboard in place....... 6--23
Figure6--10:SecuringscrewsforthePowerSupplycircuit ....... 6--24
Figure6--11:MountinghardwarefortheVectorand SCHcircuit
boards ................................................ 6--25
Figure6--12:Componentcircuitboard mountinghardware ...... 6--26
Figure6--13:Repackaginga1740A,1750A,or1760Series
instrument ............................................ 6--27
Figure10--1:Exploded View ................................. 10--11
1740ASeries,1750ASeries,&1760SeriesServiceManual v
TableofContents
List of Tables
Table1--1:Waveformverticaldeflection ...................... 1--3
Table1--2:External reference .............................. 1--6
Table1--3: Waveformhorizontaldeflection ................... 1--6
Table1--4:Measurementcursors ............................ 1--7
Table1--5:RGB/YRGB .................................... 1--7
Table1--6:Calibrator ..................................... 1--8
Table1--7:Vector mode .................................... 1--8
Table1--8:Audiomode ..................................... 1--9
Table1--9:Timecode ...................................... 1--10
Table1--10:SCHPhasemode(1750Seriesand
1760Option SCOnly) .................................. 1--10
Table1--11:Componentvectormode(1760SeriesOnly) ......... 1--12
Table1--12:Lightningmode(1760Seriesonly) ................. 1--12
Table1--13:Bowtie mode(1760Seriesonly) ................... 1--13
Table1--14:Transcoded GBRoutputs ........................ 1--13
Table1--15:CRTdisplay ................................... 1--14
Table1--16:Powersource ................................... 1--14
Table1--17:Environmentalcharacteristics .................... 1--14
Table1--18:Physicalcharacteristics .......................... 1--15
Table1--19:Certificationsand compliances .................... 1--16
Table2--1:Remoteconnector ................................ 2--11
Table2--2: Theavailabledisplaymodes ....................... 2--27
Table3--1:Transcodersignalmixing ......................... 3--28
Table3--2:Componentdisplayoutputswitching ............... 3--29
Table4--1:Short-FormPerformanceCheck .................... 4--6
Table4--2:Vectorcursorreadoutvalues ...................... 4--17
Table4--3:Audioand TimecodeValues ....................... 4--32
Table6--1:Externalinspection check list ...................... 6--3
Table6--2: Powersupplyfaultsymptoms ...................... 6--6
Table6--3: Lowvoltssupplyvoltages ......................... 6--6
Table6--4: ControlCircuitTestPoints ........................ 6--8
Table6--5: Shutdown logiclevels ............................ 6--9
vi 1740ASeries,1750ASeries,&1760SeriesServiceManual