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1、修理前的准备工作First,preparationbeforerepair1:beforefixingtheTV,youmustunderstandthecircuitprincipleoftheTVset,thesignalf1ow,theworkingvoltageofeachpointundernormalstate,andthewaveform.Preparethedrawingdataoftherepairmachine,includingelectricalschematicdiagram,printedboard
2、diagram,etc・2:beforeyouopentherearcover,youwillknowtheshellstructureofthemachinesothatitdoesnotdamagethecase.3:bepreparedforthenecessarymeasuringinstruments,toolsandspareparts,andthegeneralconditionsforbetterrepairdepartmentshaveoscilloscopesandotherinstruments.4:be
3、foremaintenance,youshouldknowthedamageoftheTV,theacceptaneeconditionoftheuser,andthevoltagefluctuationofthegrid・Thisisveryeffectiveforcorrectjudgments・Ihopeyoudon，tneglectit!Second,themaintenaneeandattentionmattersInordertoensurethesafetyofthemachineandthesafetyofli
4、fe,avoidthedamageofthemachineduetoimproperoperation,theexpansionoffaultrangeandeventheelectricaccident・Therefore,thefollowingitemsshouldbenotedinthenidintenance:1nowdomesticorimportedTVUSESswitchpowersupply,powersupplyisthemostdirectacpowerrectifierby220and,somoveme
5、ntmaybechargedorpartialchargedasawhole・Ifhandledimproperly,itmaycausedamagetotheelectricalorinstrumentandtheextentoffailure・Therefore,itisstronglyrecommendedthattheisolationtransformerbeusedinthepowersupply.2:maintenanceplaceenvironmentmustbekeptsafe,clean,bright,ve
6、ntilated,maintenancepersonnelmustbefarawayfromthewaterpipe,groundingdevice,suchasthecoolingtubesandthemetalchairisprohibited・Thisway,ifthereisanelectricshockaccident,itcanalsoreducethedamagelevelandensurethesafetyoftheperson.Thereshouldbeinsulatedrubbercoveronthegro
7、undandonthemaintenancetable,andnometalframeshouldbeexposedonthemaintenancestagetopreventaccidentalaccidents・3:repaircircuitinsidetheTVset,musttaketheTVandexternalpowerdisconnected,theinstrumentpointer(e.g.,whosehands)oscilloscopepointerormultimetergroundinglineofgro
8、undwireconnecttotheTV,andelectricity,witha"highpotential"probereceivesthetest,buttopreventshortcircuitandelectricshock・4:inordertounload,m
