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首页 家电维修入门(Home appliance maintenance portal)

家电维修入门(Home appliance maintenance portal).doc

家电维修入门(Home appliance maintenan…

學會銨瀞f
2018-12-24 0人阅读 举报 0 0 暂无简介

简介:本文档为《家电维修入门(Home appliance maintenance portal)doc》,可适用于社会民生领域

家电维修入门(Homeappliancemaintenanceportal)家电维修入门(Homeappliancemaintenanceportal)Homeappliancemaintenanceportal,Txteverymorningtogetuptoseeonceagain"Forbes"richlist,ifitdoesnothavemyname,IwillgotoworkTalkaboutmoney,nothurtfeelings,talkaboutfeelings,themostfuckinghurtmoneyIcurseyoubuyinginstantnoodlesallyourlifewithoutseasoningbagsThisarticleiscontributedbyxhwDOCdocumentsmayexperiencepoorbrowsingontheWAPsideItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalviewHomeappliancesmaintenanceentry,colorTVmaintenanceisactuallytocolorTV"doctor",theChinesetraditionalmedicine"look,smell,cut,ask",forcolorTVmaintenanceisalsothebasictechniquesOnlytheordershouldchange:"look,ask,smell,cut""HeretothemaintenanceofcolorTVforbeginnerstointroducesomecolorTVmaintenanceshouldpayattentiontothebasicitems,andIhopetohelpbeginnersOne,receivefaultcolourTV,youperhapsask,whatknowledgedoesreceivefaultcolourTValsohaveTakeitfirstandthenfixitslowlyInfact,youknowthecolorTVisalsoavaluable"big","howtothinkofthefuturejob"problemfirstbeforeyouacceptthemaintenancePlainly,thatis,twoaspects:oneisnottobe"dependent",andtheotheristocalculatewhetherthetime,effortandreturncanbematchedwiththemaintenanceSpeakingofthefirstaspect,thatis,"againstthehumanheartcannotbe""OnceyoumeetsomeoneorhaveanulteriormotiveorbecauseoffailureofpeoplewhodonotunderstandsayarepaircannotrepairtheTVpicturetubediameteroffracture,andyoureceiveisnotfoundonthespot,afterhimbutnotthatyoudestroy,youhavetocompensate,howcanyoudoYoumightsaythatsuchpeoplemaynothave,thenyoumayalsoencounterthiskindofsituation,suchashisTVwhereelsecan'tmend,andsenttoyouhere,hadtheoriginalproblemsisnot,butbeingartificiallyexpanded,andmayevendefectofsomeimportantcomponent,andtheownerdidnotunderstandItstillinsiststhatsuchproblemsisnot,youfinallyrepaired,hesaidyouchangetoomuchtoomuchtospareparts,repairs,andthenyoumaysayisunknownTherefore,itisverynecessarytomakeclearthefaultstateoftheTVbeforerepairAsfarasthesecondaspectisconcerned,whetheryouaremaintainingthecustomerormaintainingittoyourrelativesandfriends,Ithinkyoushouldconsiderit,becausetheresultofmaintenancewillberelatedtoyourmoneyandreputationHowdoyoufigureoutthefaultstateofthefaultTVsetduringtherepairThatis"look","ask"and"smell"Firstsaid"look":whentheTVsent,youmustfirstlookatitsappearance,theshellshouldnothaveobviousfallmarks,thepicturetubeshouldbeintactAgain,"ask":first,askspecificfailurephenomenon,theprocessoffailureisasuddenorgradual,andnowwhatisthestate,ask,thesehelpyouanalyzethecauseofthefailureTwo,askifthecolorTVhasbeenturnedon,andifyou'vebeenlookingforsomeoneelsetofixit,askthesequestionstoseeifyoucanseetheTVsetonthemainplaneIfthecolorTVissentdirectlyafterafault,youcanusuallyobserveitimmediatelyOtherwise,ifithasbeenprocessedorrepairedbyothers,itwillbeagoodfirst,otherwiseitmaycausetroubleTofindoutthefaultstateoftheTV,itisbettertobeabletoobservetheTVbeforeitisontheplane,thenopenthecaseandobservecarefullyThe"threenoes"TV,payattentiontowhetherthereisaproblemtothetubediametercangentlyopenthecabinetafterbreakingafew,becausesomefracturediameterwillbefixeddeflectioncoilcannotsee,webmasterhadencounteredsuchaproblemDependsonwhetherthecircuitboardobviousbreak,alargeareaofseriousfailuressuchasburningphenomenonInparticular,itisespeciallyimportanttoobservefaultscausedbyfallingheightorlightningorpowernetworkvoltageObservethecomponentfaceandobservethewiringsurfaceAgain,"smell":therearesomefaultphenomenonyoucansmellout,suchaselectrolyticcapacitorburst,therewillbeakindofoilflavor,highpressurepackagefire,wearingashell,therewillbeakindofcokeflavor,andsoonOfcourse,youneedsomeexperienceAllofthesepreliminary"look","ask","smell"youhavedone,andyourheartalsohasseveral,andthenyoucanalsoinitiallyestimatethecostofmaintenance,youcanlettheengineback,waitingforyoutorepairTwo,estimatethemaintenancefeetopayattentiontowhatisusuallythemainmachinerepairinTVwillaskyouhowmuchmoneytofixtheTV,thenyouhavetosayalthoughnotveryaccurate,butalsotoalmostallthesameIfyoutalktoomuch,youmaynotneedit,oryoumaybesuspectedofcheatingIfyousayless,youmayloseyourmoneyAlthoughsomeareashaverelevantfeesandregulations,butintheenditmustbedeterminedaccordingtotheactualsituationSetthetotalcostofrepairsshouldbedividedintoelementreplacementcostsandmaintenancefeesInthemaintenancebeforeyoumaydamagethetelevisionthemostvaluableelementandfairly,andtheownersaidclearly,themaintenanceofthispiece,weshouldpayattentiontothefollowingseveralconditions:oneistoraisetheamountoffeesbeingrepairedwithoutfixedsets,twoisduetoabnormalvoltageincreaseorlightningdamagetoTVthree,whathasbeenmodified(suchastheinstallationoftheremotecontrolcircuit)TV,fourisbecausethefalloffire,water,suchasthereasonofdamageoftvThesecircumstanceswillincreasethedifficultyofmaintenanceforyou,ofcourse,youneedtoincreasetheamountoffeesasappropriateYou'dbettertalktotheownerThree,beginnersmaintenanceTVsafetyproblemsTelevisionisrelativelyexpensive,andthereishighvoltageofanelectricalequipment,maintenancerelatedsafetyproblemsmustpayattentionto():openthecabinetshouldnotbeusedbruteforcetoopenthecase,ifitistootighttoopen,theremustbenoscrewsorbuckletoloosen,andthenlookcarefullyopenaTVbetweenthecircuitboardandthecasingareconnectedtowires,donotpullbad,thefirstfoldunderthecabinetthefixedcircuitboardtoholdtheopenshellcasing,don'tgetdown,otherwiseeasytohitthetubediameter,oncesmashedintrouble(two)totheattentionofTV's"hot":someofthetelevisioncircuitboardis"hot",andthecityisnotisolated,ifthepowerplugtotheTVwillnotseparateTV"to"endisinsertedintothepowerline,thenthe"fire"maintenanceifyoudon'tbewareofagroundedhitTVpart,thedangerofelectricshockOntheonehand,electricshockitselfisverydangerousontheotherhand,whenanelectricshockoccurs,thebodywillsufferinvoluntaryconvulsionsOncetheTVispulledtotheground,itwillcausegreattroubleagainTosolvethisproblemisthebestisolationtransformer,ifnot,youcanadjustthedirectionoftheplugthebestelectricityinthetelevision,thetelevision"receivedthecityofthe"zero"line,soyoucanmaketheTVeasiertomeetthelocalpeople,butnot"electric"TVormachineisconnectedwiththefire"thepowerline,stillneedtobecareful(three)Note:whenthepressureinsidetheTVtoreplacethelineoutputtransformer,mustusetenthousandpensorotherwiresofthetubecapunderhighpressuredischargeclean,otherwiseitwillbeahighvoltageelectricshockoffhighpressureconnection,alsodangerousFour,somecomponentsofthecommonfaultoftherapiddeterminationofcolorTVinsidetheelectroniccomponents,althoughverymuch,butsomefaultmaintenanceisalsoaruletofollowHere,thewebmasterintroducessomekindsforbeginners,the"falsewelding"fault:Television"falsewelding"thefailurerateisrelativelylargeSomeTVworkappearedirregularwhenbad,orjuststartingsoon,lookbad,orhandslapTVhappenswhenthebadphenomenon,thisfailureisoftencausedby"falsewelding"Itischaracterizedbyeithergoodorbad,nointermediatetransitionprocess,andobviouschangeinvibrationThereareseveralrepairmethods:thefirstmethodistoturnthecircuitboardwiththenakedeyetofindthekey,tofindthecurrent,morepowerfulcomponentsfeverfeet,suchaslinepipe,poweradjustmenttube,highpowerresistors,theoutputtransformer,switchtransformer,cablesocketetc,therewillbeafalseweldingsolderjointringcrackThesecondmethodisthenormalcircuitboardflat,withascrewdriverorotherinsulatingrodpresscircuitboardsomewhere,maypressuretothefaultphenomenonsomewheretherewillbeobviouschanges,thenthefalsesolderjointsinthevicinityThirdkindsofmethods:whenusingtheabovetwomethodstofindthefalsesolderjoints,accordingtothefaultphenomenalargelydeterminethefalsesolderjointsonthecircuitboard,toblossomeverywheretodoubttoitallsoldersolderagain,itisworthmentioningthatsomelargeintegratedcircuitpinmaybefalsewelding,ifnotitalsoforweldingagainThismethodisoftenveryeffective,thedrawbackisthatsometimestheTVsetrepaired,butIdonotknowwhatiscausedbyfalsewelding,resistancedamage:TVresistanceisthelargestelement,butnotthehighestfailurerateofcomponents(Ithinkthedamagerateofthehighestelementiselectrolyticcapacitor)resistanceafterthedamagemayopenorlargerresistanceThereareresistancestoosmall,butveryrareCommonresistancecarbonfilmresistors,metalfilmresistors,wirewoundresistorandfuseresistancethesetwo,resistanceintheTVeverywhere,thedamagecharacteristicsofmysummaryaretwo:oneisthesmallresistance(lessthanonehundredOhm)andresistance(ohmsabove)thedamagerateishighThemiddlevalueashundredsofEuropetotensofthousandsofEuroperarelydamagedTwoistheresistanceofsmallresistance,damageisoftenburned,black,itiseasytosee,andtheresistanceofbigresistancewhenthereisnotraceofdamageWirewoundresistorsaregenerallyusedforhighcurrentlimitingcurrentsandaregenerallyoflittleresistanceCylindricalwirewindingresistance,somewillburnblackorsurfacecracking,cracks,andsomehavenotraceCementresistanceisalsoakindofwirewoundresistance,itmaybreakwhenburned,otherwiseitwillnothaveanytracesThesafetyresistanceislimitedtoflowWhenitburns,sometimesthesurfacewillblowupapieceofleather,andsometimesthereisnotrace,butitwillneverscorchandblackenKnowtheabovefeatures,youcanchecktheresistancewhenyoucanfocuson,accordingtotracesquicklyfindtheburnedoutresistor,electrolyticcapacitordamagefeatures:electrolyticcapacitorsintheTVsetisalsousedinparticular,andthefailurerateisparticularlyhighElectrolyticcapacitordamageafterthefollowingsituations:first,completelylostcapacityorcapacitysmallertwoisminororseriousleakagethreeislostcapacityorcapacitysmaller,whiletheleakageForelectrolyticcapacitordamagearealsotips:oneistosee:alookatthefollowing:somewilldamagecapacitorleakage,circuitboardcapacitancebelowevencapacitoritselfwillhavealayerofoil,thisiscertainlynotthecapacitancewelltwosee:somedamageonthesurfaceofcapacitorcanmusterThenormalshouldbeflatTwoistouch:Aftertheboot,someseriousleakageofelectrolyticcapacitoritselfwillheat,andtouchthecapacitorwiththetipofthefingerwhenitwillevenbehot,sothecapacitormustalsobereplacedThreeisaccordingtothelocationjudgment:theelectrolyticcapacitorhaselectrolyte,iflongtimebakingwillmakethecapacitordry,sothatthecapacitancewillreduce,orevencompletelylosecapacitySoit'simportanttocheckthecapacitanceneartheheatsink,andthenearerthesliceis,themorelikelyitistodamageAnddecidedtoreplaceelectrolyticcapacitordamage:TVfaultphenomenonofallsortsofstrangethingscausedbythedamageoftheelectrolyticcapacitorDuetochangesintemperatureoftheelectrolyticcapacitordamageitselfwillcausechangesinitsowncapacityorthesizeoftheleakage,thechangeprocesswillcauseTVfaultphenomenon,whichischaracterizedbyfaultchangesthereisatimeoftherules,suchassomeTVjustbootfielddoesnotopen,thengraduallyopenedForinstancesomeTVjuststartingwhenonlythepowerindicatorlights,theTVcannotstart,afterafewminuteshesuddenlystartedandcannormallywatch,etcTherefore,accordingtothefaultofsomeTVsets,itiseasytojudgethefaultcausedbytheelectrolyticcapacitorAccordingtotheelectrolyticcapacitorwhichplaysintheTVrole,somebadinfluenceonthecapacitanceperformanceofminorTVworkisnotgreat,forexample,aslightdeclineincapacityoffiltercapacitorleakageorleakage,butsomeslightcapacitancecapacitydecreasedslightlywillcauseTVdoesnotwork,suchasoscillationcapacitorswitchingpowersupply,thesecapacitorsorevenmillionmeasuringalsoisnormal,butmustchangethefailuretorepairtheTVnew,diode,transistorandothersemiconductordevicesdamagecharacteristics:diode,transistordamageisgenerallyPNjunctionbreakdownoropencircuit,usuallybreakdownshortcircuitphenomenonmostlyTherearetwokindsoftheirdamagephenomenon:oneisthethermalstabilitybecomesworse,asthenormalworkingtemperatureofarefrigerator,upthepipesoftbreakdowntheotherisaPNjunctioncharacteristicdeterioration,manifestedinthemultimeterresistanceprofileofR*KTomeasure,thenormalPNjunctionbutonthetubeAfternotworkingproperly,ifyouuseRorR**Lowresistancegeartothetest,youwillfinditspositivevalueislargerthanthenormalPNjunctionpipeThequalitymeasurementofdiode,triodecanusepointerMultimeterinroadmeasurement,generallymoreaccurate,themethodis:willthemultimeterorR*R*Lowresistancegear(usuallywithR*,measurementisnotobviouswithR*Two,testfiles)triodePNjunctionreverseresistanceontheroad,iftheforwardresistanceisnottoolarge(relativelynormalresistance),reverseresistanceislargeenough(relativepositiveresistance)showedthatthePNjunctionisnormal,ifbotharetoosmallortoolarge,thesuspect,afterwelding,undertheThisisbecausethemeasuringprincipleofperipheralresistancegradetwoorthreegeneralcircuitpipemostlyinoverhundredsofthousandsofEurope,withamultimetermeasuringsmallresistancetostallintheroad,canignoretheperipheralresistanceeffectonPNjunctionresistanceInthisway,thepipewithbadcharacteristicscanbefounddirectly,withhighaccuracyandhighefficiency,integratedcircuitdamagecharacteristicsandmeasurement:integratedcircuitinternalstructureiscomplex,manyfunctions,anypartofthedamagecannotworkproperlyTherearetwokindsofdamagetotheintegratedcircuit,eithercompletelydamagedornotgoodthermalstabilityInthefirstcase,whenitissuspectedofdamage,itcanberemoved,

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