资源描述：
《点读机常见故障维修总结》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、点读机常见故障维修总结SummaryofcommontroubleshootingforpointreadingmachineManyfaultpointreadingmachinewillbediversity,morecommonare:1.23pointreadingdoesnotbootwithoutmachine;myexperieneeisasfollowsthefollowingtime,experieneetheinadequaciespleaseforgive:Thisarticleisnotbasedonprinciple,butonlyo
2、nexperienceFirst,donotboot(notboot,dividedintohardbootandsoftboot)Leadtonobootfaultrankingbelow:1:USBblock(designisunreasonable)2,systemdamage(ModernFLASHinstability,programlackofselfinspectionandrepairfunction)3:FLASH,MCU(Anykabadchipsucks)4.Capacitanee(withstandvoltageonly6volts)5
3、:U10(userchargermixedwithbad,unstablevoltage,U10bearthebrunt)6;SDcard(NP12toinsertSDcardandinsertedintotheforeignbodycausedbyinternalshortcircuit)7:key(bad,isoccasionallyunsolderingbeltline)Detectionandrepair:1,see:lookattheUSBpinwhetherdislocation,loosening,deformation,ifabnormalca
4、nbeenergizedtoseewhethertheboot,ifnot,canbeinstalledinabatterycompartmentorbatterypowertoseeiftheclipisenergized,suchas,basicallyisUSBbad,canbedirectlyreplaced;2,test:iftheUSBseatisnormal,itcanquicklylockthefaultbymeasuringcurrentA)thereisnocurrentintheUSBblockandthebatteryholder・Th
5、eswitchisusuallyD7andtheswitchisoutoforder,B)thecurrentislessthan10MA,maybeU10isbroken,morethan300MA,payattentiontoMCUandU10,(c)ifapowersourceisinsertedintotheUblock,itbecomes0volts,whichcanbeabreakdownofacapacitor,D)currentin1OMA40MA,likeFLASH,orSDcardsystemisbroken,E)ifthereiscurr
6、entinthekey,thereisnocurrentwhenitisreleased・ItmaybeMCUisnotgood3,bootdeadrepairstepssuggest:suggestinthesystemrepair,firstformatthemachine,inordertosolvethepotentiallogicbadblock,improvethesystemstability・Two,donotreadLeadstonon-readorpoint-readingbadfaultranking:1.Badretinal(defec
7、tcausedbyprocess,silverpaste,printingline,oxidationdeterioration)2.Sboard3.leftandrightsideplate(printedcircuitboardoxidationcorrosion)4.Signalgeneratorcircuit5leftcable6.Systemdamage7;MCUmotherboardbad8.Usenonstandardpowersupply9.UseambientelectromagneticradiationThepointpenisnotin
8、cludedbecauseofthea
