Rework-Process-Summary(PCBA)

ReworkProcessSummaryAdvancedProcessTechnology2005FlextronicsProprietary&Confidential2Proprietary&ConfidentialOverview¾Introduction¾PassiveComponentsRework9020190402906039Tantalum9PassiveReworkSummary¾BGAReworkI.BGARemovalProcessII.SiteDressingProcessIII.ReplacementProcess¾CCGARework¾Removal¾SiteDressing¾Replacement¾LGA/CSPRework¾Mini–Stencil¾PrintonPCBSubstrate¾PrintonComponent¾ReworkProcess¾X-Ray¾Summary3Proprietary&ConfidentialIntroduction•Thisisasummaryoftechnicalinformationrelatedtorework.•Thisisnota“reworkequipmentevaluationreport”,eventhoughsomereferencetoreworkequipmentismadeinthedocument.4Proprietary&Confidential0201ReworkTouchUpandreworkisoftenrequiredafterreplacementofcomponentatthesesmallspacing.Itcanbedonewithafine-tipsolderironthatgoeswitheithertheERSA,JBCorMetcalSolderingStation.Forfluxing,astandardfluxpenhasbeenused.Itwouldbebeneficialtofindafluxpenwithafinertipthanwhatwehavebeenusinghere,sincetoomuchfluxiseasilyadministeredwiththestandardtool.TouchUpandRework5Proprietary&Confidential0201ReworkERSAPincette40SolderingSystemAdvantages:•Finetips(downto0.2mm)•Adjustablegap(0.4-11.5mm)Disadvantages:•Longdistancebetweenhandandsoldering•Hardtocenterthetipswhenchanged.Replacementceramicchipcapacitorsshouldbepre-heatedonahot-plateto80degCbeforepick-up.Thisistoavoiddamagefromheat-shockwhenthetipstouchthecomponent.Componentshouldnotbeleftonthehot-platemorethantwohourstoavoidexcessiveoxidization.Thistimemayvarydependingontheterminationalloysandquality.ERSAheatedTweezers6Proprietary&Confidential0201ReworkJBCreplacebetween0603TheresistornetworkcanbegrabbedbythewaistWhen0201ismountedwiththeterminationtowardstheCSP,reworkbecomesmoredifficult.butisquitefeasiblewithbothERSAandJBC.Itrequiressubstantialskillandminimumtemperaturesetontheheatedtweezerstoavoidleavingburn-marksontheplasticoftheCSP.TheERSAhasanadvantagewithitsthinnertipsinthispositionERSASolderingReworkSystem7Proprietary&Confidential0201ReworkPA1200-001Micro-HotTweezersJBC-AdvanceSolderingIronAD-4200Advantages:9Shortdistancebetweenhandandsoldering9Angledtipsforimprovedaccessibility9FitswellinhandDisadvantages9Noadjustmentforopen&closedtipgap9Slightlythicker(0,25mm)tipsTheJBCdoesthejobwithlesstremblingsincethetipsareclosertothehand.9Contacttime1second.9LeadFreetemp.270C8Proprietary&Confidential0201ReworkAfterBefore10milspacingJBC-AdvanceSolderingIron9Proprietary&Confidential0402ReworkThistypeofreworkcanbeperformedwithJBCorERSAEvenwiththisUltrasmall0402pad,reworkcanbedonewithbothequipmentsetsTheJBCcanreachinandreplace0402betweentantalums.TheERSAcannot.AgainthisisduetothestraightshapeoftheERSAtips.ERSAvs.JBCSolderingSystem10Proprietary&Confidential0603ReworkThe0603canbereplacedwitheithertoolItispossibletoreplacethe0603witheithertool,butnotthetantalum.ERSAvs.JBCSolderingSystem11Proprietary&ConfidentialTantalumReworkReplacingthetantalumispossiblewithbothtools,butthereissomedifficultyingettingenoughheat-transfertotheboard.Ifatantalumterminationwasconnectedtoaground-plane,pre-heatingwouldbenecessary.1234Inthesituationshownonthepicture,itisnotpossibletoreachthesolder-jointswitheithertool.Aconfigurationsuchasthatintheredsquare,wouldhavetobereworkedinthefollowingsequence.Remove1,4,2,3.Mount2,3,1,4Thiswouldnotbeapreferreddesign.ERSAvs.JBCSolderingSystem12Proprietary&ConfidentialReworkHandToolsTouchup•Metcal2045-034MaterialsrequiredSolderingSystem•Flux-coresolder•Fluxgel•Solderwicks•Tissue/Wipes•Tweezers•CutterTypicalreworktoolingMetcalSP200SolderingStation13Proprietary&ConfidentialReworkHandTools0402+06036MILspacingFigure102014MILspacingFigure20210+06034MILspacingFigure3ResnetandTant6MILspacingFigure4¾IDEAL-TEK-Tweezers(recommended)5SADRExtrafinetips0.20mm¾IDEAL-TEK-OffersESDGriphighprecisiontweezerswhichhasbeentestedincombinationwithahot-airpen.ThismethodisfrequentlyusedtodaywithinFlextronicsforreworkofdensitypopulatedhandheldproducts.(seefigure1-4)Theprecisiontweezersofferexcellentaccessibility.IDEALTEKTweezers14Proprietary&ConfidentialSummaryUsingeitherERSAorJBCasrecommended.Toremovingdiscreteandpassivecomponents.Thede-solderingsystemwithheatedtweezerstype,sizedtomatchtheleadwidthofthecomponents.Thetweezersheatedtypeorslottipsmakedirectcontactwiththeleadofthepart.Allowthetipstoreflowthesoldercompletelyonbothsidesofthecomponent.Insomecasebottomcomponentsmayhaveepoxydown,slightlytwistthetipinacircularmotionandliftsimultaneouslytobreakthesurfacetensionoftheepoxythathasbeenholdingthecomponenttothelands.TheJBCiseasiertohandle,sinceithasashorterdistancefromthesolder-tipstotheoperatorsfingers.IalsolaysbetterInthehandwhichmakesdelicatecomponentmanipulatinglessdifficult.TheangledtipsimprovesaccessibilityovertheERSAsstraighttips,inmostcases.TheERSAhasanadvantageinitsstraightslightlythinnertips;0,2mmcomparedtotheJBC0,25mm.Overall,theJBCoffersthebettersolution.15Proprietary&ConfidentialOverview¾Introduction¾PassiveComponentsRework9020190402906039Tantalum9PassiveReworkSummary¾BGAReworkI.BGARemovalProcessII.SiteDressingProcessIII.ReplacementProcess¾CCGARework¾Removal¾Site