Samsung ML-3750ND Service Manual

MonoLaserPrinter

ML-3750ND

MANUAL

SERVICE

MonoLaserPrinter

1.Precautions

2.ProductSpecications

3.DisassemblyandReassembly

4.AlignmentandTroubleshooting

5.SystemDiagram

6.ReferenceInformation

Contents

RefertotheservicemanualintheGSPN(seetherearcover)formoreinformation.

Contents

1.Precautions......................................................................................................................................1−1

1.1.Safetywarning........................................................................................................................1−1

1.2.Cautionforsafety....................................................................................................................1−2

1.2.1.Toxicmaterial.............................................................................................................1−2

1.2.2.Electricshockandresafetyprecautions.........................................................................1−2

1.2.3.Handlingprecautions...................................................................................................1−3

1.2.4.AssemblyandDisassemblyprecautions...........................................................................1−3

1.2.5.Disregardingthiswarningmaycausebodilyinjury............................................................1−4

1.3.ESDprecautions......................................................................................................................1−5

2.ProductSpecications........................................................................................................................2−1

2.1.Specications..........................................................................................................................2−1

2.1.1.ProductOverview........................................................................................................2−1

2.1.2.Specications.............................................................................................................2−1

2.1.2.1.GeneralPrintEngine......................................................................................2−1

2.1.2.2.ControllerandSoftware..................................................................................2−2

2.1.2.3.PaperHandling.............................................................................................2−4

2.1.2.4.Consumables................................................................................................2−5

2.1.2.5.ReliabilityandService...................................................................................2−5

2.1.2.6.Maintenancepart...........................................................................................2−5

2.1.2.7.Environment................................................................................................2−5

2.1.3.ModelComparisonTable..............................................................................................2−7

2.2.ProductDescription..................................................................................................................2−8

2.2.1.FrontView.................................................................................................................2−8

2.2.2.RearView..................................................................................................................2−9

2.2.3.PaperPath..................................................................................................................2−10

2.2.4.Systemlayout.............................................................................................................2−11

2.2.4.1.FeedingPart.................................................................................................2−12

2.2.4.2.Tonercartridge.............................................................................................2−14

2.2.4.3.Fuserunit....................................................................................................2−16

2.2.4.4.LSU(LaserScanningUnit).............................................................................2−17

2.2.5.HardwareConguration................................................................................................2−18

2.2.5.1.Mainboard..................................................................................................2−19

2.2.5.2.OPEboard...................................................................................................2−21

2.2.5.3.DIMMPBA-Optional...................................................................................2−22

2.2.5.4.SCFboard-Optional.....................................................................................2−22

2.2.5.5.SMPSboard.................................................................................................2−23

2.2.5.6.HVPSboard.................................................................................................2−24

2.2.6.EngineF/WControlAlgorithm......................................................................................2−25

Contents

2.2.6.1.Feeding.......................................................................................................2−25

2.2.6.2.Transfer.......................................................................................................2−25

2.2.6.3.Fusing.........................................................................................................2−26

2.2.6.4.LSU............................................................................................................2−26

2.2.7.SoftwareDescriptions..................................................................................................2−27

2.2.7.1.Softwaresystemoverview..............................................................................2−27

2.2.7.2.Architecture.................................................................................................2−27

2.2.7.3.DataandControlFlow...................................................................................2−28

3.DisassemblyandReassembly..............................................................................................................3−1

3.1.Precautionswhenreplacingparts................................................................................................3−1

3.1.1.Precautionswhenassemblinganddisassembling...............................................................3−1

3.1.2.PreautionswhenhandlingPBA......................................................................................3−1

3.1.3.ReleasingPlasticLatches..............................................................................................3−2

3.2.Screwsusedintheprinter..........................................................................................................3−3

3.3.ReplacingtheMainSVCparts...................................................................................................3−4

3.3.1.Cover........................................................................................................................3−4

3.3.2.Mainboard.................................................................................................................3−6

3.3.3.HVPSboard...............................................................................................................3−6

3.3.4.SMPSboard...............................................................................................................3−7

3.3.5.LaserScanningUnit(LSU)...........................................................................................3−7

3.3.6.Fuserunit...................................................................................................................3−8

3.3.7.MainDriveunit...........................................................................................................3−9

3.3.8.Feeddriveunit............................................................................................................3−10

3.3.9.Pickup/Regi./MPClutch.............................................................................................3−11

3.3.10.Pickuproller..............................................................................................................3−11

3.3.11.TransferRoller............................................................................................................3−12

3.3.12.MPunit.....................................................................................................................3−12

3.3.13.OPEboard.................................................................................................................3−13

3.3.14.Bin-fullsensor............................................................................................................3−13

3.3.15.Regi_Feed_Emptysensor..............................................................................................3−14

3.3.16.Cassetteroller(Retardroller).........................................................................................3−15

4.AlignmentandTroubleshooting...........................................................................................................4−1

4.1.AlignmentandAdjustments.......................................................................................................4−1

4.1.1.ControlPanel..............................................................................................................4−1

4.1.2.UnderstandingTheStatusLED......................................................................................4−2

4.1.3.Clearingpaperjams.....................................................................................................4−3

4.1.4.Usefulmenuitemforservice.........................................................................................4−7

4.1.5.PeriodicDefectiveImage..............................................................................................4−9

4.1.6.Usefulmanagementtools..............................................................................................4−10

4.1.6.1.UsingSamsungEasyPrinterManager(Windowsonly)........................................4−10

Contents

4.1.6.2.UsingSamsungPrinterStatus(Windowsonly)...................................................4−12

4.1.6.3.UsingSmartPanel(MacintoshandLinuxonly)..................................................4−13

4.1.6.4.UsingSyncThruWebService(SWS)................................................................4−14

4.1.7.UpdatingFirmware......................................................................................................4−16

4.1.7.1.UpdatethermwarebyusingtheUSBport........................................................4−16

4.1.7.2.Updatethermwarebyusingthenetwork..........................................................4−17

4.1.8.TechMode.................................................................................................................4−19

4.2.Troubleshooting......................................................................................................................4−22

4.2.1.Procedureofcheckingthesymptoms...............................................................................4−22

4.2.1.1.BasicCheckList...........................................................................................4−23

4.2.2.ErrorCodeandTroubleshooting.....................................................................................4−24

4.2.3.Imagequalityproblem..................................................................................................4−36

4.2.4.Othererrors................................................................................................................4−42

5.SystemDiagram................................................................................................................................5−1

5.1.BlockDiagram........................................................................................................................5−1

5.2.ConnectionDiagram.................................................................................................................5−2

6.ReferenceInformation........................................................................................................................6−1

6.1.ToolforTroubleshooting...........................................................................................................6−1

6.2.Glossary.................................................................................................................................6−2

6.3.TheSamplePatternfortheTest..................................................................................................6−8

6.4.Selectingalocation..................................................................................................................6−9

1.Precautions

Inordertopreventaccidentsandtopreventdamagetotheequipmentpleasereadtheprecautionslistedbelowcarefully beforeservicingtheprinterandfollowthemclosely .

1.1.Safetywarning

1)Onlytobeservicedbyafactorytrainedservicetechnician.

Highvoltagesandlasersinsidethisproductaredangerous.Thisproductshouldonlybeservicedbyafactorytrained servicetechnician.

2)UseonlySamsungreplacementparts.

Therearenouserserviceablepartsinsidetheproduct.Donotmakeanyunauthorizedchangesoradditionstothe productasthesecouldcausetheproducttomalfunctionsandcreateanelectricshocksorrehazards.

3)LaserSafetyStatement

TheprinteriscertiedintheU.S.toconformtotherequirementsofDHHS21CFR,chapter1SubchapterJfor ClassI(1)laserproducts,andelsewhereiscertiedasaClassIlaserproductconformingtotherequirementsofIEC 60825-1.ClassIlaserproductsarenotconsideredtobehazardous.Thelasersystemandprinteraredesignedso thereisneveranyhumanaccesstolaserradiationaboveaClassIlevelduringnormaloperation,usermaintenance orprescribedservicecondition.

1.Precautions

•Wavelength:800nm

•Beamdivergence

-Paraller:12degrees

-Perpendicular:35degrees

•Maximumpowerofenergyoutput:15mW

WARNING

NeveroperateorservicetheproductwiththeprotectivecoverremovedfromLaser/Scannerassembly .Thereected beam,althoughinvisible,candamageyoureyes.

Whenusingthisproduct,thesebasicsafetyprecautionsshouldalwaysbefollowedtoreduceriskofre,electricshock, andpersonalinjury .

1.Precautions

1.2.Cautionforsafety

1.2.1.Toxicmaterial

Thisproductcontainstoxicmaterialsthatcouldcauseillnessifingested.

1)Pleasekeepimagingunitandtonercartridgeawayfromchildren.Thetonerpowdercontainedintheimagingunitand tonercartridgemaybeharmful,andifswallowed,youshouldcontactadoctor.

1.2.2.Electricshockandresafetyprecautions

Failuretofollowthefollowinginstructionscouldcauseelectricshockorpotentiallycauseare.

1)Useonlythecorrectvoltage,failuretodosocoulddamagetheproductandpotentiallycauseareorelectricshock.

2)Useonlythepowercablesuppliedwiththeproduct.Useofanincorrectlyspeciedcablecouldcausethecableto overheatandpotentiallycauseare.

3)Donotoverloadthepowersocket,thiscouldleadtooverheatingofthecablesinsidethewallandcouldleadtoare.

4)Donotallowwaterorotherliquidstospillintotheproduct,thiscancauseelectricshock.Donotallowpaperclips,pins orotherforeignobjectstofallintotheproduct,thesecouldcauseashortcircuitleadingtoanelectricshockorrehazard.

5)Nevertouchtheplugsoneitherendofthepowercablewithwethands,thiscancauseelectricshock.Whenservicing theproduct,removethepowerplugfromthewallsocket.

6)Usecautionwheninsertingorremovingthepowercord.Whenremovingthepowercord,gripitrmlyandpull.The powercordmustbeinsertedcompletely,otherwiseapoorcontactcouldcauseoverheatingleadingtoare.

7)Takecareofthepowercable.Donotallowittobecometwisted,bentsharplyaroundcornersorpowercablemaybe damaged.Donotplaceobjectsontopofthepowercable.Ifthepowercableisdamageditcouldoverheatandcausea re.Exposedcablescouldcauseanelectricshock.Replacethedamagedpowercableimmediately,donotreuseor repairthedamagedcable.Somechemicalscanattackthecoatingonthepowercable,weakeningthecoverorexposing cablescausingreandshockrisks.

8)Ensurethatthepowersocketsandplugsarenotcrackedorbrokeninanyway .Anysuchdefectsshouldberepaired immediately.T akecarenottocutordamagethepowercableorplugswhenmovingthemachine.

9)Usecautionduringthunderorlightningstorms.Samsungrecommendsthatthismachinebedisconnectedfromthe powersourcewhensuchweatherconditionsareexpected.Donottouchthemachineorthepowercordifitisstill connectedtothewallsocketintheseweatherconditions.

10)A voiddampordustyareas,installtheproductinacleanwellventilatedlocation.Donotpositionthemachineneara humidierorinfrontofanairconditioner.Moistureanddustbuiltupinsidethemachinecanleadtooverheatingand causeareorcausepartstorust.

11)Donotpositiontheproductindirectsunlight.Thiswillcausethetemperatureinsidetheproducttorisepossiblyleading totheproductfailingtoworkproperlyandinextremeconditionscouldleadtoare.

12)Donotinsertanymetalobjectsintothemachinethroughtheventilatorfanorotherpartofthecasing,itcouldmake contactwithahighvoltageconductorinsidethemachineandcauseanelectricshock.

13) cangetashockbytheelectricdischarge.

WhenreplacingtheSMPSboard,pleasewait5minutesafterunpluggingthepowercord,thenreplaceit.Y ou

1.Precautions

1.2.3.Handlingprecautions

Thefollowinginstructionsareforyourownpersonalsafetytoavoidinjuryandsoasnottodamagetheproduct.

1)Ensuretheproductisinstalledonalevelsurface,capableofsupportingitsweight.Failuretodosocouldcause theproducttotiporfall.

2)Theproductcontainsmanyrollers,gearsandfans.T akegreatcaretoensurethatyoudonotcatchyourngers,hairor clothinginanyoftheserotatingdevices.

3)Donotplaceanysmallmetalobjects,containersofwater,chemicalsorotherliquidsclosetotheproductwhichifspilled couldgetintothemachineandcausedamageorashockorrehazard.

4)Donotinstallthemachineinareaswithhighdustormoisturelevels,besideonopenwindoworclosetoahumidieror heater.Damagecouldbecausedtotheproductinsuchareas.

5)Donotplacecandles,burningcigarettes,etcontheproduct,Thesecouldcauseare.

1.2.4.AssemblyandDisassemblyprecautions

1)ReplacepartscarefullyandalwaysuseSamsungparts.T akecaretonotetheexactlocationofpartsandalsocable routingbeforedismantlinganypartofthemachine.Ensureallpartsandcablesarereplacedcorrectly.Pleasecarryout thefollowingproceduresbeforedismantlingtheproductorreplacinganyparts.

2)Ensurethatpowerisdisconnectedbeforeservicingorreplacinganyelectricalparts.

3)Disconnectinterfacecablesandpowercables.

4)Onlyuseapprovedspareparts.Ensurethatpartnumber,productname,anyvoltage,currentortemperaturerating arecorrect.

5)Whenremovingorre-ttinganypartsdonotuseexcessiveforce,especiallywhenttingscrewsintoplastic.

6)Takecarenottodropanysmallpartsintothemachine.

7)HandlingoftheOPCDrum

•TheOPCDrumcanbeirreparablydamagedifitexposedtolight.T akecarenottoexposetheOPCDrumeither todirectsunlightortouorescentorincandescentroomlighting.Exposureforaslittleas5minutescandamage thesurfaceofthephotoconductivepropertiesandwillresultinprintqualitydegradation.Takeextracarewhen servicingtheproduct.RemovetheOPCDrumandstoreitinablackbagorotherlightproofcontainer.Take carewhenworkingwiththeCovers(especiallythetopcover)openaslightisadmittedtotheOPCareaandcan damagetheOPCDrum.

•TakecarenottoscratchthegreensurfaceofOPCDrumUnit.IfthegreensurfaceoftheDrumCartridgeis scratchedortouchedtheprintqualitywillbecompromised.

1.Precautions

1.2.5.Disregardingthiswarningmaycausebodilyinjury

1)Becarefulwiththehightemperaturepart.

Thefuserunitworksatahightemperature.Usecautionwhenworkingontheprinter.Waitforthefuserunitto cooldownbeforedisassembly.

2)Donotputngersorhairintotherotatingparts.

Whenoperatingaprinter,donotputhandorhairintotherotatingparts(Paperfeedingentrance,motor,fan,etc.). Ifdo,youcangetharm.

3)Whenyoumovetheprinter,usesafeliftingandhandlingtechniques.

Thisprinterisheavy .Usetheliftinghandleslocatedoneachsideofthemachine.Backinjurycouldbecausedif youdonotliftcarefully.

4)Ensuretheprinterisinstalledsafely.

Ensuretheprinterisinstalledonalevelsurface,capableofsupportingitsweight.Failuretodosocouldcausethe printertotiporfallpossiblycausingpersonalinjuryordamagingtheprinter.

5)Donotinstalltheprinteronaslopingorunstablesurface.Afterinstallation,doublecheckthattheprinterisstable.

1.Precautions

1.3.ESDprecautions

Certainsemiconductordevicescanbeeasilydamagedbystaticelectricity.Suchcomponentsarecommonlycalled “ElectrostaticallySensitive(ES)Devices”orESDs.ExamplesoftypicalESDsare:integratedcircuits,someeldeffect transistors,andsemiconductor“chip”components.Thetechniquesoutlinedbelowshouldbefollowedtohelpreducethe incidenceofcomponentdamagecausedbystaticelectricity.

CAUTION

Besurenopowerisappliedtothechassisorcircuit,andobserveallothersafetyprecautions.

1)Immediatelybeforehandlingasemiconductorcomponentorsemiconductor-equippedassembly,drainoffany electrostaticchargeonyourbodybytouchingaknownearthground.Alternatively ,employacommerciallyavailable wriststrapdevice,whichshouldberemovedforyourpersonalsafetyreasonspriortoapplyingpowertotheunit undertest.

2)AfterremovinganelectricalassemblyequippedwithESDs,placetheassemblyonaconductivesurface,suchas aluminumorcopperfoil,orconductivefoam,topreventelectrostaticchargebuildupinthevicinityoftheassembly.

3)UseonlyagroundedtipsolderingirontosolderordesolderESDs.

4)Useonlyan“anti-static”solderremovaldevice.Somesolderremovaldevicesnotclassiedas“anti-static”can generateelectricalchargessufcienttodamageESDs.

5)DonotuseFreon-propelledchemicals.Whensprayed,thesecangenerateelectricalchargessufcienttodamageESDs.

6)DonotremoveareplacementESDfromitsprotectivepackaginguntilimmediatelybeforeinstallingit.Most replacementESDsarepackagedwithallleadsshortedtogetherbyconductivefoam,aluminumfoil,oracomparable conductivematerial.

7)ImmediatelybeforeremovingtheprotectiveshortingmaterialfromtheleadsofareplacementESD,touchtheprotective materialtothechassisorcircuitassemblyintowhichthedevicewillbeinstalled.

8)MaintaincontinuouselectricalcontactbetweentheESDandtheassemblyintowhichitwillbeinstalled,until completelypluggedorsolderedintothecircuit.

9)MinimizebodilymotionswhenhandlingunpackagedreplacementESDs.Normalmotions,suchasthebrushingtogether ofclothingfabricandliftingone’sfootfromacarpetedoor,cangeneratestaticelectricitysufcienttodamageanESD.

2.ProductSpecications

2.1.Specications

2.1.1.ProductOverview

1)Speed

•35ppminA4/37ppminLetter

2)Processor

•533MHz

3)PrinterLanguages

•PCL6/5e,PostsScript3,IBMProPrinter,EPSON

4)Memory(Std/Max)

•128MB/512MB

5)Interfaces

•HighSpeedUSB2.0

•10/100/1000BaseTXnetworkconnector

•IEEE1284Parallel(Optional)

6)Tonercartridge(Initial/Sales)

•7K/7K,15K

2.1.2.Specications

•ProductSpecicationsaresubjecttochangewithoutnotice.

2.1.2.1.GeneralPrintEngine

ItemSpecication

SimplexUpto35ppminA4(37ppminLetter) EngineSpeed

DuplexUpto17ipminA4(18ipminLetter)

Warm-uptimeFromSleep15sec

FromReadyAsfastas8sec FPOT

FromSleepAsfastas15.5sec

ResolutionUpto1,200x1,200dpieffectiveoutput

2.1.2.2.ControllerandSoftware

ItemSpecication

ProcessorSamsung533MHz

2.ProductSpecications

Memory

PrinterLanguagesPostScript3,PCL6/5e,IBMProPrinter,EPSON

Fonts93scalable,1bitmap,136PostScript3fonts

Driver

Std128MB

Max512MB

Flash16MB

DefaultDriverPCL

InstallPCL6/PS3

SupportingOS

Windows2000/XP(32/64bits)/Vista(32/64bits)/2003 Server(32/64bits)/2008Server(32/64bits)/7(32/64bits)/2008Server R2(64bits)

VariousLinuxOS:

•RedHatEnterpriseLinuxWS4,5(32/64bit)

•Fedora4,5,6,7,8,9,10,11,12(32/64bit)

•SuSELinux10.0,10.1(32bit)

•OpenSuSE10.2,10.3,11.0,11.1,11.2(32/64bit)

•Mandriva2005,2006,2007,2008,2009,2009.1(32/64bit)

•Ubuntu5.04,5.10,6.06,6.10,7.04,7.10,8.04,8.10,9.04,

9.10(32/64bit)

•SuSELinuxEnterpriseDesktop10,11(32/64bit)

•Debian4.0,5.0(32/64bit)

MacOS10.3~10.6

UNIXOS:

•SunSolaris9,10(x86,SPARC)

•HP-UX11.0,11iv1,11iv2,11iv3(PA-RISC,Itanium)

•IBMAIX5.1,5.2,5.3,5.4

WHQLWindows2000/XP(32/64bits)/Vista(32/64bits)/2003

Server(32/64bits)/2008Server(32/64bits)/7(32/64bits)/2008Server R2(64bits)

Compatibility•PCL6:Win2000/XP(32/64bits)/2003Server(32/64bits)/

Vista(32/64bits)/2008Server(32/64bits)/7(32/64bits)/2008 ServerR2(64bits)

•PS3:Win2000/XP(32/64bits)/Vista(32/64bits)/2003

server(32/64bits)/2008Server(32/64bits)/7(32/64bits)/2008 ServerR2(64bits)PPD,MacPPD,LinuxPPD(Withinthe scopeofSupportingOS)

2.ProductSpecications

ItemSpecication

WiredNetwork

Protocol•[TCP/IP]

TCP/IPv4/IPv6,HTTP ,SNMPv1/v2c/v3,SMTP ,IPSec, DNS/WINS,DDNS,DHCP ,SSL/TLS,BOOTP ,AutoIP , StandardTCP/IPprinting,LPR,IPP ,UPnP(SSDP),Bonjour, Telnet,WSD,SLP ,SetIP

•[Others]

HTTPs,IPPs,802.1x(EAP-MD5,EAP-MSCHAPv2, PEAP,TLS),IPSec

SupportingOS•[Windows]

•MicrosoftWindows2000/XP(32/64bits)/

2003(32/64bits)/Vista(32/64bits)/2008(32/64bit)/ 7(32/64bit)

•[Mac]

•MacOS10.3~10.6

•[Linux]

•RedHat8~9(32bit)/EnterpriseLinuxWS4,5(32/64bit)

•FedoraCore1~7(32/64bit)

•SuSE8.2~10.2/EnterpriseDesktop9~10(32/64bit)

•Madrake9.2~10.1(32/64bit)

•Mandriva2005~2007

•Ubuntu6.06~7.04

•Debian3.1~4.0[Novell]-Netware5.x,6.x(TCP/IPOnly)

•[Novell]

•Netware5.x,6.x(TCP/IPOnly)

•[Unix]

•SunSolaris8,9,10(SP ARC/x86)

•IBMAIX5.x(6.1)IBMLinux(SystemP)

•HP-UX11i(PA-RISC/IA-64)

(11.11/11.20/11.22/11.23/11.31)

ProtocolN/A WirelessNetwork

SupportingOSN/A

EasyPrinterManagerforWindows/Macintosh/LINUX Application

NetworkManagementSyncThruWebAdminService5.0

Interface

UserInterface

ParallelOption

USBHi-SpeedUSB2.0

WiredNetworkGigabit(Internal)

WirelessNetworkN/A

LCD2-Line

LEDNavigation,ECO,Power,Status

KeyNavigationkeys,ECO,NumericKeypad,Power,Cancel

2.1.2.3.PaperHandling

ItemSpecication

StandardCapacity250-sheetCassetteTray,50-sheetMultiPurposeTray@80g/m²

Max.Capacity820sheets@80g/m²(850sheets@75g/m²)

2.ProductSpecications

Printing

Multi-purposetray

StandardCassetteTray

OptionalCassetteTray

•Max.Size:216x356mm(8.5"x14")

•Min.Size:76x127mm(3.0"x5.0")

Capacity

Mediasizes

Mediatype

Mediaweight16~58lb(60to220g/m²)

SensingPaperEmpty

Capacity250sheets@80g/m²(250sheets@75g/m²)

Mediasizes

MediatypesPlainPaper,Thin,Thick,Recycled,Bond,Cardstock,Archive

Mediaweight16~43lb(60to163g/m²)

SensingPaperEmpty

Capacity520sheets@80g/m²(550sheets@75g/m²)

MediasizesA4,A5,A6,Letter,Legal,Folio,Ocio,Executive,ISOB5,JISB5

MediatypesPlainPaper,Thin,Thick,Recycled,Bond,Cardstock,Archive

•PlainPaper:50sheets@80g/m²(50sheets@75g/m²)

•Envelop:5sheets

A4,A5,A6,Letter,Legal,Folio,Ocio,Executive,ISOB5,JISB5, 3"x5",Envelope(Monarch,No.10,DL,C5,C6),Custom

Plain,Thin,Thick,Thicker,Cotton,Colored,Envelope,Transparency , Pre-Printed,Recycled,Labels,Bond,Cardstock,Archive

A4,A5,A6,Letter,Legal,Folio,Ocio,Executive,ISOB5,JISB5, Custom

Mediaweight16~43lb(60to163g/m²)

SensingCSTOpen,PaperEmpty

Capacity

OutputStacking

OutputFullsensingYes

SupportingBuilt-in

MediasizesA4,Letter,Ocio,Folio,Legal

Duplex

MediatypesPlainPaper,Thin,Thick,Recycled,Bond

Mediaweight16~32lb(60to120g/m²)

PrintableAreaNon-PrintableArea

•Face-Down:150sheets@80g/m²

•Face-Up:1sheet

•Envelop:10mm(0.4")fromedge(Top,Bottom,Left,Right)

•OtherMedia:4mm(0.16")fromedge(Top,Bottom,Left,

Right)

2.ProductSpecications

2.1.2.4.Consumables

ItemSpecication

Toner

DrumYieldN/A

Black•Standard:AverageCartridgeYield7Kstandardpages.

KeyElectronickey(CRUM)Only

LifedetectTonergaugesensorbydotcount

2.1.2.5.ReliabilityandService

ItemSpecication

RecommandedAMPV1500sheets/month

MaxAMPV3500sheets/month

Max.MonthlyDuty80,000sheets/month

MPBF45,000sheets

MTBF35months

MTTR30min.

•HighYield:A veragecartridgeYield15Kstandardpages.

(Shipswith7,000pagesStarterTonerCartridge)

DeclaredcartridgeyieldinaccordancewithISO/IEC19752.

2.1.2.6.Maintenancepart

ItemPartCodeLife

TransferrollerJC66-02842AApprox.100,000Pages

FuserUnit•JC91-01023A(110V)

•JC91-01024A(220V)

Pick-upRollerJC73-00340AApprox.90,000Pages

ReverseRollerJC90-01032AApprox.60,000Pages

Approx.90,000Pages

2.1.2.7.Environment

ItemSpecication

Temperature10Cto32C OperatingEnvironment

Humidity20%to80%

AcousticNoiseLevel

(SoundPower/Pressure)

Printing52dBA

StandbyBackGroundLevel(Lessthan26dBA)

SleepBackGroundLevel

ItemSpecication

2.ProductSpecications

PowerConsumption

ReadyLessthan60W

AverageLessthan550W

Powersave/PowerOffLessthan1.5W/Lessthan0.1W

Dimension(WxDxH)Set366x368x272.9mm(14.40x14.48x10.74inches)withoutoptional

tray

WeightSet(Includetoner

10.24kg(22.58lbs)

cartridge)

2.ProductSpecications

2.1.3.ModelComparisonTable

Samsung

ML-3750ND

Image

Speed35ppm(A4)/37ppm

(Letter)

Processor533MHz600MHz600MHz400MHz

Memory (Std/Max)

EmulationPCL6/5e,PS3PCL6/5e,PS3PCL6PCL6/PS3

MP/Cassette50/25050/25050/25050/250

SCF520sheets520sheets500sheets550sheets

DuplexStd.Std.Std.Std.

TonerYield7K/15K2K/5K/10K2.3K/6.5K3.5K/9K

Interface•HighspeedUSB

128/512MB128/384MBP2055dn(128/384MB)

2.0

•Ethernet

10/100/1000Base TX

Samsung

ML-3710ND

35ppm(A4)/37ppm (Letter)

•HighspeedUSB

2.0

•Ethernet

10/100/1000Base TX

P2050series

33ppm(A4)38ppm(A4)

P2055d(64/320MB)

•HighspeedUSB

Lexmark

E360dn

32/288MB

•HighspeedUSB

2.0

•Ethernet

•Ethernet10/100

10/100/1000Base TX(P2055dn)

2.0

BaseTX

Noise52dB52dB55dB53dB

2.2.ProductDescription

}

{

Thischapterdescribesthefunctionsandoperatingprincipalofthemaincomponent.

2.2.1.FrontView

2.ProductSpecications

1Outputtray

2Controlpanel

3Controlboardcover

4Frontcover

5Paperlevelindicator

6Optionaltray

7Tray1

8Multi-purposetray

9Multi-purposetraypaperextension

10Paperwidthguidesonamulti-purposetray

11Outputsupport

2.ProductSpecications

{

}

2.2.2.RearView

1NetworkPort

2USBport

3USBport2*(ML-3753NDonly)

4IEEE1284parallelconnectorpowersupplyjack

5Power-switch

6Powerreceptacle

7Duplexunit

8Rearcover

9Traybackcover

*TwoUSBportsallowyoutoconnectaprintertotwoseparatecomputers.Printerdriversneedtobeinstalledonboth computersforthisoperation.DoubleconnectionsfromaprintertoasinglecomputerthroughtheUSBportscanresultin seriousdamagetotheprinterandcomputer.

2.2.3.PaperPath

[1]

S implex [2] Duplex [3] MP

Thefollowingdiagramdisplaysthepaththepaperfollowsduringtheprintingprocess.

2.ProductSpecications

2.2.4.Systemlayout

ThismodelconsistsoftheEngineparts,HardwareandFirmware.Theenginepartsconsistsofthemechanicalparts comprisingFrame,Duplex,Tonercartridge,Driveunit,Transferroller,Fuser,Cassette.TheHardwarepartconsistsofthe maincontrolboard,powerboard,operationpanel,PCInterface.

1LSU(LaserScanningUnit)

2TonerCartridge

3Regi.Roller

4MP

5FeedRoller

6Pick-UpRoller

7Cassette

8DuplexUnit

9Fuser

10ExitRoller1

11ExitRoller2

2.ProductSpecications

2.2.4.1.FeedingPart

Itconsistsofacassette,anMPtrayforsupplyingdifferenttypesofmedia(envelope,label,specialpaper)andparts relatedtopaperfeedinitialization.

1)Cassette

ThepapertraysconsistoftheMaintrays,Optionaltrays(SCF),andoneMulti-Purpose(MP)tray .Thebasiccassetteis locatedonfrontsideofthemachineandallowsfeedingofcommonpaper.PapersizeissetusingtheSizeGuidesineach tray.AdjustthePaperlength/widthguidestomatchthepapersize.

2)Pickup/Retard(Reverse)roller

Whenpickuptakesplace,thepickuprollerrotatestoseparateandtransportthepaper.Thepickuprollerrotateswhenthe pickupclutchisactivated.Thereverserollerservetomakesurethatasinglesheetofpaperismovedtothepaperpath, andthepaperismovedasfarastheregistrationrollerbytheworkofthefeedroller.Thefollowingisadiagramofthe pickupsection:

3)Registrationroller

Itisusedasanantiskewdevice,andtosetupproperregistrationtimingwiththatofthetonedimageonthedrum.Italsois usedforjamdetectiontoensurepaperhasleftthepapertray.

2.ProductSpecications

4)MPTray

Themulti-purposetraycanholdspecialsizesandtypesofprintmaterial,suchaspostcards,notecards,andenvelopes. Itisusefulforsinglepageprintingonletterheadorcoloredpaper.Ituses3rollersfeedingmethodtofeed50sheets ofgeneralpapers.

5)DuplexUnit

Ithaspapertransferringfunction,paperguidefunction,jamremovingfunction.Itisdesignedforbasicattachment,andthe duplexfeedingtakesasidefeedingmethod.UsablepapersareA4,letter,andlegalsizepaper.Forremovingajamoccurred inafrontpart,itisdesignedtoopenacassetteandaguide.Itisdesignedtoopenarearcovertoremoveajaminarearpart. Ifafaceuptrayisopen,theduplexoptioncannotbeused.

6)OptionCassette

Itisthesamemethodwiththemaincassette,andthecapacityis520sheets.Ithasaseparatedrivingmechanism.Itis designedforacommonusewithamaincassette.

2.2.4.2.Tonercartridge

1)Printingprocessoverview

2.ProductSpecications

ThismonoprintingsystemincludestheLSUwithalaserbeams,atonercartridgeandtransferroller .

Thismachineusessingletonercartridgeandduallaserbeamsformonoprinting.ThetonercartridgeconsistsofDrum unitandDevelopmentunit.TheDrumunithasanOPCdrum,cleaningblade.

TheOPCdrumischargedwithanegativevoltagebythescorotronandisexposedbythelightfromtheLSU(Laser Scanningunit).ThelightproducedbyalasercreatesalatentimagebydischargingonthesurfaceoftheOPCdrum.The negativelychargedtonersareattractedtothelatentimageduetoandelectriceld.Thetoners(realimage)ontheOPCdrum aremovedtothetransfermediabythepositivebiasappliedtothetransferroller.

1)ChargingtheOPCdrum:Thescorotrongivesthedrumnegativecharges.

2)Laserexposure:LightproducedbyalaserdiodeirradiatesthechargedOPCthroughthelensandmirrors.

3)Development:Thismachineusesadual-componentdevelopmentsystem.Themagneticrollercarriesnegatively chargedtonertothelatentimageonthedrumsurface.

4)Transfer:ThetransferrollersoppositetheOPCdrumstransfertonerfromthedrumstothetransfermedia(e.g.paper, OHPlm,etc).

5)CleaningforOPCdrum:Thecleaningbladeremovesremainingtonersonthedrumsurfaceafterimagetransfer tothepaper.

2.ProductSpecications

2)TonerCartridge

Byusingtheelectronicphotoprocess,itcreatesavisualimage.Inthetonercartridge,theOPCunitandthedeveloping unitareinabody.TheOPCunithasOPCdrumandchargingroller,andthetonercartridgeunithastoner,supplyroller, developingroller,andblade(Doctorblade).

•Operationcondition:T emp10~30℃,Humidity20~85%RH

•DevelopingMethod:Nonmagnetic1elementcontactingmethod

•Toner:Nonmagnetic1elementshattertypetoner

•Thelifespanoftoner(ISO19752pattern/A4standard)

-Initialtoner:7K

-Salestoner:7K/15K

•TonerResidualSensor:DotcountwithCRUM

•OPCCleaning:Collectthetonerbyusingcleaningblade

•Handlingofwastedtoner:Collectthewastedtonerinthecleaningframebyusingcleaningblade

•OPCDrumProtectingShutter:None

•Classifyingdevicefortonercartridge:IDisclassiedbyCRUM.

aChargeRoller

bDrumOPC

cCleaningBlade

fSupplyRoller

gChargeCleaningRoller

hAgitator1

dDoctorBlade

eDeveloperRoller

iAgitator2

2.ProductSpecications

Pressure Roller

Pressure Roller2

Halogen Lamp

Heat Roller

Thermistor

Thermostat

2.2.4.3.Fuserunit

Itisconsistedofahalogenlamp,heatroller,pressureroller,thermistorandthermostat.Itsticksthetoneronapaperby heatandpressuretocompletetheprintingjob.

1)Thermostat

Whenaheatlampisoverheated,aThermostatcutsoffthemainpowertopreventover-heating.

•ThermostatType:Non-Contacttype

•ControlTemperature:170℃±5℃

2)Thermistor

Itisatemperaturedetectingsensor .

•TemperatureResistance:7(180℃)

3)Heatroller

Theheatrollertransferstheheatfromthelamptoapplyaheatonthepaper.

ThesurfaceofaheatrolleriscoatedwithTeon,sotonerdoesnotsticktothesurface.

4)Pressureroller

Apressurerollermountedunderaheatrollerismadeofasiliconresin,andthesurfacealsoiscoatedwithT eon.When apaperpassesbetweenaheatrollerandapressureroller,toneradherestothesurfaceofapaperpermanently.

5)HalogenLamp

•V oltage:120V,115±5%/220V ,230±5%

•Capacity:850Watt±25W

2.ProductSpecications

OPC Drum

Photo Diode

LD Driver circit

Protector panel

LD(Laser Diode)

Polygon Mirror

Polygon Motor

Motor Driver

2.2.4.4.LSU(LaserScanningUnit)

ItisthecorepartoftheLBPwhichswitchesfromthevideodatareceivedtothecontrollertotheelectrostaticlatentimage ontheOPCdrumbycontrollinglaserbeam,exposingOPCdrum,andturningprincipleofpolygonmirror.TheOPCdrumis turnedwiththepaperfeedingspeed.The/HSYNCsignaliscreatedwhenthelaserbeamfromLSUreachestheendofthe polygonmirror,andthesignalissenttothecontroller.Thecontrollerdetectsthe/HSYNCsignaltoadjusttheverticallineof theimageonpaper.Inotherwords,afterthe/HSYNCsignalisdetected,theimagedataissenttotheLSUtoadjusttheleft marginonpaper.Theonesideofthepolygonmirrorisonelineforscanning.

2.2.5.HardwareConguration

MAIN

C3N

533 MHz

FUSER Unit

ThermoS tat

Thermisto r1

Exit

Sen sor

Regi Clutch

Pickup Clutch

Front Cover Micro Switch

24V

5V_SMP S

FUSER ON

Relay

24VS

3.3V

3.3V_Co ver_Op en1

3.3V_Co ver_Op en3.3V

DEVELOPER Unit

FAN

MAIN

FAN

SMPS

OPC MHV

DEV

Supp ly

THV

Varistor

DRUM

Main

Motor

BLDC

Se rial Flas h

16MB

DDR3 1 DIMMP BA

Defa ult x1 6 128 MB(1Gb 1e a)

Opt ion x16 5 12MB(2Gb*2e a)

EEP ROM(I2C CH0 )

EEP ROM

24C51 2(Sys +NW)

SP I

000

SOL

C R U M

0000

RTL8211 E Giga_ PHY

25MHz

FUSER

BIAS

INLET

Clutch

Pap er

Size/Binful

Sen sor

Clock

Gene rato r

ASM3P28 63A

12MHz

MAINCLK

USB CLK

REF

USB 2 .0

Device

INLET

FUSER

SOL

HVPS

SMPS

24VS

EMPTY

Sen sor

REGI

Sen sor

FEED

Sen sor

LSU MOTOR

Lase r Diod(Dua l Beam )

UART

Option

SCF

ECO

Canc el

Powe r

Statu s_LED

C ance

Na vi

_K E

LCD

Relay

SYS TEM RAM

SO _DIMMCo n.

204 pin

Eras er

LED

SOL

Usb

USB/P ara llel

DC-DC 3 CH

5V to 3 .3V,1.5V,1 .2V

2 Lin e LCD

I2C

3.3V/1.2 V

1.5V

Rea r Cove r

Micro Switch

PANEL

LSU

uart

Option

PARALLEL

(Parallel to US B)

DIMM_P BA

LDO

5V to 1 .8V

1.8V

TheML-3750seriesElectricalCircuitSystemconsistsofthefollowing:

•Mainboard

•OPEboard

•SMPSboard

•HVPSboard

•SCFboard(Optional)

DiagramoftheML-3750SeriesElectricalCircuit

2.ProductSpecications

TheMainControllercontrolsallmodulesrequiredtoprint,thatis,LSU,HVPS,SMPS,FAN,Fuser,etc.

TheMainControllerreceivesprintdatafromthehostthroughnetworkorUSBPort.Ittakesthisinformationandgenerates printablevideobitmapdata.EngineandVideoControllerarenotseparated.

TheMainControlleradoptstheChorus3N(533MHz)CPU,onboardDDR3memorytoperformprintingjobssuccessfully.

TheOPEControllerdisplaysthestatusofthesystemusing16x2lineLCDinresponsetouseractionsortheMaincontroller.

TheHVPSsupplieshighvoltagefordevelopingProcess.HighVoltagecontrolledbyPWMsignalfromCPU.

TheSMPSmakes+5Vand+24VDCfrom220Vor110AC.

2.ProductSpecications

MAIN

C3 N

53 3 MHz

S e rial F las h

16 MB

DDR3 1 DIMM PBA

De fa u lt x16 1 28 MB(1 Gb 1 e a )

Op tion x16 512 MB(2Gb *2e a)

EE P RO M(I2C C H0)

EE P RO M

24C 512(S ys+NW)

S P I

RTL82 11 E Giga _PHY

25MHz

Clock

Ge nera tor

ASM3P 2863 A

12 MHz

MAIN CLK

USB C LK

REF

US B 2 .0

De vice

S YSTEM R AM

S O_DIMM Con.

20 4pin

US B/P a ra llel

DC-DC 3 CH

5V to 3.3V,1.5 V,1.2V

I2C

3.3 V/1.2 V

1.5 V

DIMM_PBA

LDO

5V to 1.8V

1.8 V

2.2.5.1.Mainboard

ML-3750seriesMainboardiscomposedwithbelowcomponents.

•Chorus3N:T ogeneratetheprintablevideodataandcontrolengineEmbeddedUSB2.0device,Hostchannel

•Systemmemory-1CHDIMMPBADDR3128MB(Default)

•GigaEthernetPHY:Networkprinting

•SerialFlash(16MB):Programmemory

TheMainControllermanagesanElectro-photographysystem,controlstheVideoDataofprintingimagesfromMainBoard toLSU,provideshigh-voltagesandPWMs,adjuststemperatureinthefusingsystem,readssensorsignalsandcontrols SCFoption.

TheMaincontrolleralsocontrolsOPEandGigaN/WPHY ,USBDevice.

[Mainboarddiagram]

[Mainboardimage]

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vve

wwe

xxe

yye

zze

{{e

||e

}}e

~~e

uue

vve

2.ProductSpecications

•Connection

1HVPS

2PaperEmpty,Regi,Feed

sensor

3OPE

4CRUM

5THERMISTOR

6OutbinFullSensor&Rear

Cover

7N/W

8USBDevice

•Information

-PartCode:JC92-02469A

-PBAName:PBA-MAIN

9ParallelOptionDCsupply

10Debug

11ExitSensor

12F ANSMPS

13Airtemperature

14MainMotor&Clutch

15SCF

16SMPSSignal

17SMPSPower

jack

18MP

19LSU

20F ANMAIN

21DDR3SODIMM

2.ProductSpecications

2.2.5.2.OPEboard

TheOPEboardiscomposedofanOPEMICOM(STM8SP103K3MAFTR),twostatusLED,ECOLED,powerLED,four navigationLED,16x2lineLCDandsomekeys.OPEcommunicateswithmaincontrollerviaUART .

[OPEboarddiagram]

[OPEboardimage]

•Information

-PartCode:JC92-02468A

-PBAName:OPE-LCD

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