Samsung SCX-4701ND - Fusing; Lsu

2.Productspecicationanddescription
2.2.6.3.Fusing
Thetemperaturechangeoftheheatroller’ssurfaceischangedtotheresistancevaluethroughtheuseofathermistor.
TheMainBoardusestheresistancevalueoftheThermistorandconvertsittoavoltagevaluethroughtheuseofanAD
converter,thetemperatureisdecidedbasedonthevoltagevalueread.TheACpoweriscontrolledbycomparingthetarget
temperaturetothevaluefromthethermistor.Ifthevaluefromthethermistorisoutofcontrollingrangewhilecontrollingthe
fusing,theerrorstatedinthebelowtableoccurs.
•OpenHeatError
Whentheengineoperatesthewarm-upprocess,ifthetemperatureofthexingunitisnothigherthanaspecied
temperaturewithinapredeterminedtime,theenginedenesOpenHeatError.Whenthiserrorisdetected,theengine
stopsallfunctionsandkeepstheerrorstate.Also,theengineinformstheerrorstatusofthemainsystem,soitcantake
appropriateaction;andthentheerrormessageisdisplayedatLCDwindoworLEDinformingtheerrorstatusoftheuser.
•LowHeatError
Whentheengineisatstand-by,printingorwarm-upmode,ifthetemperatureofthexingunitislowerthanthe
speciedtemperatureateachstateandthelowertemperaturestateismaintainedduringthespeciedtime,theengine
denesLowHeatError.Whenthiserrorisdetected,theenginestopsallfunctionsandkeepsitattheerrorstate.Also,
theengineinformstheerrorstatusofthemainsystem,soitcantakeappropriateaction;andthentheerrormessage
isdisplayedatLCDwindoworLEDinformingtheerrorstatusoftheuser.
•OverHeatError
Foroverallenginestate,ifthetemperatureofthexingunitishigherthanthespeciedtemperatureandthetemperature
stateisdetectedforaspecicduration,thentheenginedenesOverHeatError.Whenthiserrorisdetected,theengine
stopsallfunctionsandkeepsitattheerrorstate.Also,theengineinformstheerrorstatusofthemainsystem,soit
cantakeappropriateaction;andthentheerrormessageisdisplayedatLCDwindoworLEDinformingtheerror
statusoftheuser.
2.2.6.4.LSU
LSUreceivestheimagedatafromPVCorHPVCandmakethelatentimageonOPCsurface.Itusesthedualbeam,
LD.TheerrorsrelatedtoLSUareasfollows:
•ByLready
Whentheprintingisstarted,theenginedrivesthepolygonmotorofLSU.Afterthespeciedtimeiselapsed,ifthe
motorisnotinareadystatus,theenginedetectstheerrorthatthepolygonmotorisnotinareadystatus.Ifthiserror
happens,theenginestopsallfunctionsandkeepsitattheerrorstate.Also,theengineinformstheerrorstatusofthe
mainsystemandtheerrormessageisdisplayedatLCDwindoworLEDinformingtheerrorstatusoftheuser.
•ByHsync
Whenthepolygonmotorisready,theLSUsendsoutthesignalcalledHsyncandusedtosynchronizewitheachimage
line.So,iftheenginedoesnotdetectconsecutivelythesignalforaxedtime,itdenestheHsyncError.Ifthiserror
happens,theenginestopsallfunctionsandkeepsitattheerrorstate.Also,theengineinformstheerrorstatusofthe
mainsystemandthentheerrormessageisdisplayedatLCDwindoworLEDinformingtheerrorstatusoftheuser.LSU
ErrorRecovery:IftheLReadyorHsyncerrorhappens,thepaperisexitedbeforetheerrorcodeisinitiated.Theengine
modeischangedtorecoverymodeandtheengineinformsthemainsystemoftheenginemode.Theenginerechecks
theLSUerror,iftheerrordoesnotreoccurprintingisresumed.
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