Samsung SCX-4701ND - Engine F;W Control Algorithm; Feeding; Transfer

2.Productspecicationanddescription
2.2.6.EngineF/WControlAlgorithm
2.2.6.1.Feeding
Iffeedingfromacassette,thedriveofthepickuprolleriscontrolledbycontrollingthesolenoid.Theon/offofthe
solenoidiscontrolledbycontrollingthegeneraloutputportortheexternaloutputport.Whilepapermoves,occurrence
ofJamisjudgedasbelow.
ItemDescription
JAM0•Afterpickingup,paperdoesnotreachtheFeedSensorwithinapredeterminedtime.
•Afterpickingup,ifthefeedsensorisnoton,re-pickupwillbeinitiated..Afterre-pickingup,ifthe
feedsensorisnotonaftercertaintime,itisJAM0.
•Eventhoughthepaperreachestothefeedsensor,thefeedsensordoesnotdetecttheleadedgeof
thepaper.
JAM1•Aftertheleadingedgeofthepaperpassesthefeedsensor,thetrailingedgeofthepaperdoesnotclear
thesensorafterpredeterminedperiodoftime.
•Aftertheleadingedgeofthepaperpassesthefeedsensor,thepapercannotreachtheexitsensor
afterpredeterminedperiodoftime.
*Thepaperexistsbetweenthefeedsensorandtheexitsensor.
JAM2Thetrailingedgeofthepaperdoesnotcleartheexitsensorwithinapredetermined
2.2.6.2.Transfer
Thechargingvoltage,developingvoltageandthetransfervoltagearecontrolledbyPWM(PulseWidthModulation).The
eachoutputvoltageischangeableduetothePWMduty.Thetransfervoltageadmittedwhenthepaperpassesthetransfer
rollerisdecidedbyenvironmentconditions.Theresistancevalueofthetransferrollerischangedduetothesurrounding
environmentortheenvironmentoftheset,andthevoltagevalue,whichchangesduetotheenvironment,ischangedthrough
theADconverter.Thevoltagevalueforimpressingtothetransferrollerisdecidedbythechangedvalue.
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