激光打印机电路板维修小窍门Laser printer circuit board maintenance tips.docx

激光打印机电路板维修小窍门Laser printer circuit board maintenance tips.docx

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激光打印机电路板维修小窍门Laserprintercircuitboardmaintenancetips

激光打印机电路板维修小窍门（Laserprintercircuitboardmaintenancetips）

Laserprintercircuitboardmaintenancetips

Thecircuitdesignoflaserprinterisquiteperfect.Itadoptsmulti-levelprotectionmeasuresandsequentialswitchcircuit,andthefaultrateisverylow.Sowhentheprinterfailstoexcludeotherimproperoperationandmaterialisnotsuitablefortheproblem,donotrushtothedismantlingofprinter,firstturnoffthepowerswitch,suchasprintertemperaturedownafterareboot,toobservewhetherthefaultisclearedifthefaultphenomenonstilloverhaul.Becausemanyfaultsinlaserprintersarecausedbytemporaryerrors,thisisdonebyrestartingtheprinter'sself-testfunctiontorecoverthesequenceerrors.

Alsonotethatmanycomponentsofthelaserprinter,suchasthedrumassembly,thefixingassembly,andthepaperrubbingwheel,arepartoftheconsumerandneedtobereplacedregularly.

I.Generalmaintenanceprocedures

Themaintenanceoflaserprintercanbedividedintothreesteps:

inquiry,observationandtest.

（1）ask:

likethedoctortoseepatients,askedtousetheoperatoroftheprinter,theprintertopurchasetime,thesizeoftheworkload,printoftenusewhatkindofprintmediaetc..Makethebasicjudgmentandreasonableexplanationaccordingtotheinformationprovidedbytheoperator.Inthecourseofmaintenance,weshouldalsothinkofpossibleproblemsandtrytosolicittheopinionsofusersandcooperatewellwiththem.Because,tosomeextent,operatorsaremorefamiliarwithprinterusagethanmaintenancepersonnel.

（2）observation:

isakindofmethodiseasy,thefirstobservationoftheuseoftheenvironment,theprintingmediumprintermeetsthestandards,whennecessarytoopenthehoodtoobservenolooseparts,damage,pollutionisseriouscheckinsidethemachine.Allthepartsthatcanbeobservedareinspectedandtouchedbyhandtomakesurethepartsareloose,hightemperatureorscorched.Ifyouareprintingtheresultofproblems,throughtheobservationofprintingproofs,analysesthereason,andthenclosethecoverisswitchedon,thepanelobservedindicatorofthestate,seetheprintercanpassthetest,"ready"indicatorisnormal.Ifthepanel"wronglight"isbrightandflashing,orifthereisabadsmellcomingoutofthemachine,thepowershouldbeturnedoffimmediatelytopreventthefaultfromexpandingandcarryoutthenextcomprehensiveinspection.

（3）test:

measurewithinstrument.Accordingtothetechnicalindexesofdifferentmodels,theresistance,voltageandcurrentvalueofeachdetectionpointaremeasured,andthecauseofthefaultisjudged.Thestructureofthelaserprintercircuitisrelativelycomplex,mostlyadoptspulse,photoelectricity,timingcircuit,measurementisdifficult,butfromyearsofdealingwiththesituation,thelaserprintermaincontrolcircuitfaultoccursrarely,mostgeneralfaultlocationinthepowersupplycircuit,atemperaturecontrolelementandthephotoelectricsensorandmechanicaltransmissiondeviceetc..Maintenanceshouldbecarriedoutinaccordancewiththelocationofthefailureandtakecorrespondingmaintenancemethods.

Two,commonlyusedmaintenancemethods

Laserprintermaintenancemethodscangenerallybedividedintothefollowingfour,namelysegmentationmethod,panelmethod,shockmethod,alternativemethod.

（1）segmentationmethod:

wetalkedaboutinfrontofalaserprinterisasetoflaser,electronics,optics,mechanicalintegratedequipment,byanalyzingthefaultphenomenon,canadoptthe"segmentation"meansforfaultdiagnosisandmaintenance.Firstofall,theanalysisofthecauseofthecauseofthefailureisinwhichpart,ifitoccursintheopticalormechanicalpart,canexcludeotherparts,focusonthefailureoftheparts.Thisiswhatiscommonlyknownasthedivisionmethod.

（2）panelmethod:

panelmethodisamoreintuitivemethod,itistousetheprinterpanelindicatorlight,orshowthewindowofthecodeinformation,taketheappropriatemethodtotroubleshoot.Thepanelreflectedinthecode,bytheprintercontrolsystemtodetectandprovideinformation,ofcourse,notalloftheerrorinformationisonehundredpercentcorrect,therearesomefaultsarecausedbyotherfaultchainreaction,buttheexperiencedmaintenancepersonnelisveryfavorable.

IftheHP4VCprinterin"16TONERLOW（saidtonerwillrunout）",alsoshows"40ERROR（saidcomputerandprinterorcomputerdriven,thebaudrateofdifferentprinterinterfacecircuitboardproblem）",butdoesnotaffectthenormalworkoftheprinter.The"40ERROR"iscausedbythechainofthepreviouscode.Afterremovingthe"16TONERLOW"information,"40ERROR"disappearsatthesametime.Therefore,itisnecessarytocorrectlyunderstandthemeaningofpanelinformation.

（3）vibrationmethod:

whenmaintainingandcheckingthelaserprinter,themethodof"vibrationinspection"isveryeffective.Aprinterthatisespeciallyoldorhasbeenusedforalongtimewithoutparticularlyobviousfailures.Vibrationmethodcanbevaried,generallyispattedmachineorbeat,insulatedobjectlightdialcircuitelement,whentouchingapartwhenthefaultdisappears,candirectlyjudgewhetherthefaultishere.

Thelaserprinterisacombinationoftechnologies,itsworkingenvironmentisverybad,somepartsoftheworkingvoltageisveryhigh,somepartsaresusceptibletoagingandoxidation,resultingindamageorburned,internaldustmoreparticularlyprinters.Thesecancausetheprinter'ssoftfailure,partsofthepoorcontactcanalsocausegoodandbadwork,sothevibrationmethodinthemaintenanceprocesscanberegardedasasimpleandeasyway.

（4）thesubstitutionmethodistoreplaceacomponentintheprinterwithnewcomponentsorothersimilarcomponents.Sometimesintherepairprocess,thefailureofthecomponentsaredifficulttoaccuratelydeterminewhetherthedamage,havenospecialinstruments,atthistime,cananalyzethefaultroughlymayoccur,usingalternativecomponentsofthenewtemporaryreplacement.Forthereplacementoftheseparationelement,itissometimesimpossibletofindtheoriginaltypeofdevice,whichcanbereplacedbyacomponentofthesametype,butthemainparametersofthecomponentmustbeconsistent.Forexample,whenthecharacterofthemainmotororscanningmotorisdamaged,thefrequencyofthereplacementcrystalmustbeinlinewiththeoriginalstandard.Iftheelementprotectionpowersupplydamage,canalsotakesupplementstoreplacethemaindemolitionmethod,ifcannotfindavaristor,athermalswitch,canbetemporarilyremoved,orthemainwaytofoldup,soyoucanfindtheelementafterthechange.Buttherewillbecircuitprotectionfault,thismethodmustbeverycareful.

Three,severalmainpartsofthedetectionmethods

Beforeyouchecktheparts,describetheuseofthemeterfirst.Themultimeterisoneofthenecessarytoolsformaintenance.Ithastwokindsofdigitalandpointertype.Itisconvenientandintuitionistictousedigitalinmeasurement,sodigitalmultimeterisusedinmaintenance.Themainpurposeofthemultimeteristodeterminethelocationandcomponentsofthefaultbymeasuringthecurrent,voltage,andresistance（alsocalledthethreeelementsofmeasurement）ateachpointofthecircuit.

Herearesomecommonlyusedcomponentsoftheprintermeasurement.

（1）themeasurementofthermistor:

theresistanceofthermistorvarieswiththetemperature.Accordingtothischaracteristic,themultimeterresistanceprofile10Kselectormeasurement,twoendsarerespectivelyconnectedtothethermistorprobe,themultimetershowstheresistance,in300~500K.Whentheelectricironisclosetothethermistor（don'tleanontheresistor,soasnottoburnout）,theresistancewillbecomesmallerasthetemperatureincreases.Thermalresistanceduetolaserprinterisnegativetemperaturecoefficient.Suchashand（ordigital）doesnotmove,orstartnumericalmeasurementsshowthattheresistanceissmall,hasbeendamaged.

（2）themeasurementofvaristors:

varistorsaregenerallyusedinparallelcircuits.Whenthevoltageatbothendsoftheresistorchangesrapidly,theresistanceshortcircuitfusesthecurrentfuseandplaysaprotectiverole.Varistorsareusedinlaserprintercircuitsforovervoltageprotectionandvoltageregulation.Whenmeasuringthemultimeter10Kfile,toprobeconnectedtotheresistormultimetershouldshowmarkedvaristoronresistance,ifbeyondthisgreatvalue,thevaristorhasbeendamaged.

（3）measurementofcapacitor:

capacitorisgenerallydividedintotwokindsofpolaritycapacitorandnon-polarcapacitor.Inthecircuit,themainfunctionsofisolatingandfiltering.

Whenmeasuringthemultimeter（+）probeconnectedtotheelectrolyticcapacitor（-）,（-）probeconnectedto（+）,justcontact,displayvaluesfromlargetosmall,thendisplayalargervalue,whichindicatesthattheelectrolyticcapacitorbasicallyisgood;ifonejustcontactnumericalverylargeorverysmall,andthereisnochange,thatthecapacitorhasbeendamaged.Thevalueisgreat,indicatingthattheinternalcircuitbreakeroftheelectrolyticcapacitorisverysmall,indicatingtheinternalshort-circuitoftheelectrolyticcapacitorandtheseriousleakageofelectricity.

Measuringcapacitanceofdifferentcapacity,multimetertobeplacedindifferentstalls,suchasmeasuring0.01~1uFcapacitance,withR*10KOmegafile,measuring1~100uFcapacitance,withR*1OmegaKfile,measuring100uFcapacitorwithR*100Omegafile.Particularattentionshouldbepaidtothecapacitordischarge（shortcircuit）whenmeasuringtheelectrolyticcapacitanceabove100uF,otherwi