飞利浦显示器105S5维修手册

HorizontalfrequenciesTABLEOFCONTENTS30-56kHzDescriptionPageDescriptionPageSafetyPrecautionI-1MicroControllerUnitIV-5EngineeringSpecificationII-1CircuitDiagramV-1ProductscopeII-1AdjustingProcedureVI-1InputRequirementII-1GeneralVI-2AdjustmentControlII-2InstrumentAlignmentVI-3ElectricalSpecificationII-2OperatingInstructionsVI-5EnvironmentalCharacteristicsII-6OSDOperationVI-5FactoryPresetTimingII-8ManualAdjustingVI-7FrontpanelcontroldescriptionIII-1TroubleShootingFlowChartVII-1UserControlIII-1PowersupplyisdefectiveVII-2OSDFunctionControlIII-3TheRasterdon’tAppearVII-4CircuitDescriptionIV-1VerticaldeflectionisdefectiveVII-4PowerSupplyCircuitIV-2VideoisdefectiveVII-5HandVProcessorCircuitIV-2MechanicalAssemblyVIII-1HorizontalCircuitIV-3PCBlayoutdiagramIX-1VideoCircuitIV-4RecommendSparepartlistX-1SAFETYNOTICEANYPERSONATTEMTINGTOSERVICETHISCHASSISMUSTFAMILIARIZEHIMSELFWITHTHECHASSISANDBEAWAREOFTHENECESSARYSAFETYPRECAUTIONSTOBEUSEDWHENSERVICINGELECTRONICEQUIPMENTCONTAINUNGHIGHVOLTAGECAUTION:USEASEPARATEISOLATIONTRANSFORMERFORTHISUNITWHENSERVICINGSafetyPrecautionPHILIPSConfidential–DoNotCopy105S5I-1!ISafetyPrecautionWARNING!Thisserviceinformationdesignedforexperiencerepairtechniciansonlyandisnotdesignedforusebythegeneralpublic.Itdoesnotcontainwarningorcautiontoadvisenon-technicalindividualsofpotentialdangersinattemptingtoserviceaproduct.Productpoweredbyelectricalshouldbeservicedorrepairedonlybyexperiencedprofessionaltechnicians.AnyattempttoserviceorrepairtheproductsdealtwithinthisserviceinformationbyanyonelesecouldresultinseriousInjuryordeath.SafetyPrecautionPHILIPSConfidential–DoNotCopy105S5I-21.CAUTION.Nomodificationofanycircuitshouldbeattempted.Serviceworkshouldonlybeperformedafteryouarethoroughlyfamiliarwithallofthefollowingsafetychecksandservicingguidelines.2.SAFETYCHECK.CareshouldbetakenwhileservicingthisCRTdisplaybecauseofthehighvoltageusedinthedefectioncircuits.Thesevoltagesareexposedinsuchareasastheassociatedflybackandyokecircuits.3.FIRE&SHOCKHAZARD.3-1InsertanisolationtransformerbetweentheCRTdisplayandACpowerlinebeforeservicingthechassis.3-2Inservicingpayattentiontooriginalleaddressespeciallyinthehighvoltagecircuit.Ifashortcircuitisfound,replaceallpartswhichhavebeenoverheatedasaresultoftheshortcircuit.3-3Alltheprotectivedevicesmustbereinstalledperoriginaldesign.3-4Solderingmustbeinspectedforpossiblecoldsolderjoints,frayedleads,damageinsulation,soldersplashesorsharpsolderpoints.Becertaintoremoveallforeignmaterial.4.LEAKAGECURRENTCOLDCHECK.4-1UnplugtheACcordandconnectajumperbetweentheprongsontheplug.4-2TurntheCRTdisplaypowerswitch“on”4-3MeasurementtheresistancevaluewithanohmmeterbetweenthejumperedACplugandeachexposedmetallicpartontheCRTdisplaysuchasthemetalframe,screwheads,controlshafts,etc.Whentheexposedmetallicparthasareturnpathtothechassis,thereadingshouldbe1.8MegaOhmminimum.5.LEAKAGECURRENTHOTCHECK.5-1PlugtheACcorddirectlyintotheACoutlet.Donotuseandisolationtransformerduringthischeck.5-2Connecta1500ohm,10wattresistor,paralleledbya0.15uFcapacitorbetweeneachexposedmetallicpartandagoodearthground(asshowninFig.1)5-3UseandACvoltmeterwith1000ohm/voltormoresensitivityandmeasuretheACvoltageacrossthecombination1500ohmresistorand0.15uFcapacitor.5-4Movetheresistorconnectiontoeachexposedmetallicpartandmeasurethevoltage.5-5ReversethepolarityoftheACplugintheACoutletandrepeattheabovemeasurement.5-6Voltagemeasuredmustnotexceed7.5voltRMS,fromanyexposedmetallicparttogroundAleakagecurrenttestermaybeusedtheabovehotcheck,inwhichcaseanycurrentmeasuredmustnotexceed5.0milliamp.Inthecaseofameasurementexceedingthe5.0milliampvalue,areworkisrequiredtoeliminatethechanceofshockhazard.Note:HighvoltageispresentwhenthisCRTdisplayisoperating.Alwaysdischargetheanodeofthepicturetubetothedisplaychassis.SafetyPrecautionPHILIPSConfidential–DoNotCopy105S5I-3!6.IMPLOSIONPROTECTION.Picturetubesareequippedwithanintegralimplosionprotectionsystem,butcareshouldbetakentoavoiddamageandscratchingduringinstallation.7.X-RADIATION.WARNING:TheonlypotentialsourceofX-Radiationisthepicturetube.HoweverwhenthehighvoltagecircuitisoperatingproperlythereisopossibilityofX-Radiationproblem,Thebasicprecautionwhichmustbeexercisedistokeepthehighvoltageatthefollowingfactory-reco9mmenedlevel.Note:Itisimportanttouseanaccurateperiodicallycalibratedhighvoltagemeter.7-1Theprocedureforadjustinghighvoltageisshownonpage49.7-2Ifhighvoltagecannotbesetto26KV,immediateserviceisrequiredthepossibilityofprematurecomponentfailure.7-3TopreventX-Radiationpossibilityitisessentialtousespecifiedpicturetube.IMPORTANTSAFETYNOTICETherearespecialcomponentusedinthisCRTdisplaysWhichareimportantforsafety.ThesepartsareidentifiedBytheinternationalsymbolontheschematicDiagramandonthereplacementpartslist.ItisessentialThatthesescircuitpartsshouldbereplacedwithManufacture’sspecifiedpartstopreventX-RADIATION,Shockfire,orotherhazards.Donotmodifytheoriginaldesignorthiswillvoidtheoriginalpartsandlaborguarantee.EngineeringSpecificationPHILIPSConfidential–DoNotCopy105S5II-1IIEngineeringSpecification1Scope1.1Thiss