Lenovo ThinkPad T420 Hardware Maintenance Manual

ThinkPadT420andT420i

HardwareMaintenanceManual

Note:Beforeusingthisinformationandtheproductitsupports,besuretoreadthegeneralinformation

underAppendixA“Notices”onpage175.

FifthEdition(March2012)

©CopyrightLenovo2012.

LIMITEDANDRESTRICTEDRIGHTSNOTICE:IfdataorsoftwareisdeliveredpursuantaGeneralServicesAdministration

“GSA”contract,use,reproduction,ordisclosureissubjecttorestrictionssetforthinContractNo.GS-35F-05925.

Contents

Aboutthismanual...........iii

Chapter1.Safetyinformation......1

Generalsafety................1

Electricalsafety...............2

Safetyinspectionguide............3

Handlingdevicesthataresensitivetoelectrostatic

discharge..................3

Groundingrequirements............4

Safetynotices(multilingualtranslations)......5

Lasercompliancestatement(multilingual

translations)................17

Chapter2.Importantservice

information..............23

StrategyforreplacingFRUs.........23

Strategyforreplacingaharddiskdrive...23

Importantnoticeforreplacingasystem

board................24

Howtouseerrormessage........24

StrategyforreplacingFRUsforCTO,CMV,and

GAV...................25

Productdenition............25

FRUidenticationforCTO,CMV,andGAV

products...............25

Chapter3.Generalcheckout.....27

Whattodorst..............28

Checkoutguide..............29

SystemsupportingtheLenovoThinkVantage

ToolboxprogramandthePC-DoctorforDOS

diagnosticsprogram..........29

SystemsupportingtheLenovodiagnostics

programs...............33

Powersystemcheckout...........37

Checkingtheacpoweradapter......37

Checkingoperationalcharging......37

Checkingthebatterypack........38

Checkingthebackupbattery.......38

Chapter4.Relatedservice

information..............41

RestoringthefactorycontentsbyusingRecovery

DiscSet.................41

Passwords................42

Power-onpassword...........42

Hard-diskpassword...........42

Supervisorpassword..........43

Howtoremovethepower-onpassword...43

Howtoremovethehard-diskpassword...43

Powermanagement............45

Screenblankmode...........45

Sleep(standby)mode..........45

Hibernationmode...........45

Symptom-to-FRUindex...........47

Numericerrorcodes..........47

Errormessages............49

Beepsymptoms............50

No-beepsymptoms...........50

LCD-relatedsymptoms.........50

Intermittentproblems..........52

Undeterminedproblems.........52

Chapter5.Statusindicators.....53

Chapter6.Fnkeycombinations...57

Chapter7.FRUreplacement

notices................61

Screwnotices...............61

Retainingserialnumbers...........62

Restoringtheserialnumberofthesystem

unit.................62

RetainingtheUUID...........63

ReadingorwritingtheECAinformation...63

Chapter8.Removingandreplacinga

FRU..................65

BeforeservicingThinkPadT420andT420i...66

1010Batterypack.............67

1020ExpressCardblankbezel........68

1030SerialUltrabayEnhanceddeviceortravel

bezel..................69

1040Harddiskdrive(HDD)andsolidstatedrive

(SSD)..................70

1050DIMMslotcover............73

1060DIMM(intheslotontheundersideofthe

computer)................74

1070PCIExpressMiniCardforwirelessWAN..75

1080Keyboard..............77

1090DIMM(intheslotunderthekeyboard)...81

1100Backupbattery............83

1110PCIExpressMiniCardforwirelessLAN..85

1120Keyboardbezelassembly,FPCcable,and

Bluethoothdaughtercard..........87

1130SmartCard..............92

1140Modemdaughtercard(MDC).......94

©CopyrightLenovo2012

i

1150Speakerassembly...........95

1160LCDunit...............97

1170Fanassembly.............101

1180CPU................105

1190BasecoverassemblyandDC-inconnector

cable..................106

1200Magnesiumstructureframe.......110

1210SystemboardandExpressCardslot

assembly.................112

1220mSATAsolidstatedrive.........114

2010LCDbezelassembly..........116

2020LEDboard..............117

2030Integratedcamera...........119

2040LCDpanelandLCDcable........121

2050Cameracable.............123

2060WirelessLANantennaassemblyorwireless

LAN/WANantennaassembly.........124

2070HingesandLCDrearcoverassembly...126

Chapter9.Locations........129

Frontview................129

Rearview.................131

Bottomview...............132

Chapter10.Partslist........133

Overall..................134

LCDFRUs................155

Keyboard.................160

Miscellaneousparts............162

Informationaboutacpoweradapters......164

Powercords...............165

Recoverydiscs..............166

Commonservicetools...........173

AppendixA.Notices.........175

Electronicemissionsnotices.........176

Trademarks................177

iiThinkPadT420andT420iHardwareMaintenanceManual

Aboutthismanual

ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad

®

products.

ThinkPadT420andT420iMachineType4177,4178,4179,4180,4236,4237,and4238

Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.

Important:

ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPadproducts.Usethis

manualalongwiththeadvanceddiagnosticteststotroubleshootproblemseffectively.

BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderChapter1“Safetyinformation”on

page1andChapter2“Importantserviceinformation”onpage23.

©CopyrightLenovo2012

iii

ivThinkPadT420andT420iHardwareMaintenanceManual

Chapter1.Safetyinformation

Thischapterpresentsfollowingsafetyinformationthatyouneedtobefamiliarwithbeforeyouservice

aThinkPadNotebook.

•“Generalsafety”onpage1

•“Electricalsafety”onpage2

•“Safetyinspectionguide”onpage3

•“Handlingdevicesthataresensitivetoelectrostaticdischarge”onpage3

•“Groundingrequirements”onpage4

•“Safetynotices(multilingualtranslations)”onpage5

•“Lasercompliancestatement(multilingualtranslations)”onpage17

Generalsafety

Followtheserulestoensuregeneralsafety:

•Observegoodhousekeepingintheareaofthemachinesduringandaftermaintenance.

•Whenliftinganyheavyobject:

1.Makesurethatyoucanstandsafelywithoutslipping.

2.Distributetheweightoftheobjectequallybetweenyourfeet.

3.Useaslowliftingforce.Nevermovesuddenlyortwistwhenyouattempttolift.

4.Liftbystandingorbypushingupwithyourlegmuscles;thisactionremovesthestrainfromthe

musclesinyourback.Donotattempttoliftanyobjectthatweighsmorethan16kg(35lb)orthat

youthinkistooheavyforyou.

•Donotperformanyactionthatcauseshazardstothecustomer,orthatmakestheequipmentunsafe.

•Beforeyoustartthemachine,makesurethatotherservicetechniciansandthecustomer'spersonnelare

notinahazardousposition.

•Placeremovedcoversandotherpartsinasafeplace,awayfromallpersonnel,whileyouareservicing

themachine.

•Keepyourtoolcaseawayfromwalkareassothatotherpeoplewillnottripoverit.

•Donotwearlooseclothingthatcanbetrappedinthemovingpartsofamachine.Makesurethatyour

sleevesarefastenedorrolledupaboveyourelbows.Ifyourhairislong,fastenit.

•Inserttheendsofyournecktieorscarfinsideclothingorfastenitwithanonconductiveclip,about8

centimeters(3inches)fromtheend.

•Donotwearjewelry,chains,metal-frameeyeglasses,ormetalfastenersforyourclothing.

Attention:Metalobjectsaregoodelectricalconductors.

•Wearsafetyglasseswhenyouarehammering,drilling,soldering,cuttingwire,attachingsprings,using

solvents,orworkinginanyotherconditionsthatmightbehazardoustoyoureyes.

•Afterservice,reinstallallsafetyshields,guards,labels,andgroundwires.Replaceanysafetydevice

thatiswornordefective.

•Reinstallallcoverscorrectlybeforereturningthemachinetothecustomer.

•Fanlouversonthemachinehelptopreventoverheatingofinternalcomponents.Donotobstructfan

louversorcoverthemwithlabelsorstickers.

©CopyrightLenovo2012

1

Electricalsafety

Observethefollowingruleswhenworkingonelectricalequipment.

Important:

Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoftmaterialthatdoes

notinsulateyouwhenworkingwithliveelectricalcurrents.

Manycustomershave,neartheirequipment,rubberoormatsthatcontainsmallconductiveberstodecrease

electrostaticdischarges.Donotusethistypeofmattoprotectyourselffromelectricalshock.

•Findtheroomemergencypower-off(EPO)switch,disconnectingswitch,orelectricaloutlet.Ifanelectrical

accidentoccurs,youcanthenoperatetheswitchorunplugthepowercordquickly.

•Donotworkaloneunderhazardousconditionsornearequipmentthathashazardousvoltages.

•Disconnectallpowerbefore:

–Performingamechanicalinspection

–Workingnearpowersupplies

–Removingorinstallingmainunits

•Beforeyoustarttoworkonthemachine,unplugthepowercord.Ifyoucannotunplugit,askthecustomer

topower-offthewallboxthatsuppliespowertothemachine,andtolockthewallboxintheoffposition.

•Ifyouneedtoworkonamachinethathasexposedelectricalcircuits,observethefollowingprecautions:

–Ensurethatanotherperson,familiarwiththepower-offcontrols,isnearyou.

Attention:Anotherpersonmustbetheretoswitchoffthepower,ifnecessary.

–Useonlyonehandwhenworkingwithpowered-onelectricalequipment;keeptheotherhandinyour

pocketorbehindyourback.

Attention:Anelectricalshockcanoccuronlywhenthereisacompletecircuit.Byobservingtheabove

rule,youmaypreventacurrentfrompassingthroughyourbody.

–Whenusingtesters,setthecontrolscorrectlyandusetheapprovedprobeleadsandaccessoriesfor

thattester.

–Standonsuitablerubbermats(obtainedlocally,ifnecessary)toinsulateyoufromgroundssuchas

metaloorstripsandmachineframes.

Observethespecialsafetyprecautionswhenyouworkwithveryhighvoltages;Instructionsforthese

precautionsareinthesafetysectionsofmaintenanceinformation.Useextremecarewhenmeasuring

highvoltages.

•Regularlyinspectandmaintainyourelectricalhandtoolsforsafeoperationalcondition.

•Donotusewornorbrokentoolsandtesters.

•Neverassumethatpowerhasbeendisconnectedfromacircuit.First,checkthatithasbeenpoweredoff.

•Alwayslookcarefullyforpossiblehazardsinyourworkarea.Examplesofthesehazardsaremoistoors,

nongroundedpowerextensioncables,powersurges,andmissingsafetygrounds.

•Donottouchliveelectricalcircuitswiththereectivesurfaceofaplasticdentalmirror.Thesurfaceis

conductive;suchtouchingcancausepersonalinjuryandmachinedamage.

•Donotservicethefollowingpartswiththepoweronwhentheyareremovedfromtheirnormaloperating

placesinamachine:

–Powersupplyunits

–Pumps

–Blowersandfans

–Motorgenerators

–Similarunitstolistedabove

Thispracticeensurescorrectgroundingoftheunits.

•Ifanelectricalaccidentoccurs:

2ThinkPadT420andT420iHardwareMaintenanceManual

–Usecaution;donotbecomeavictimyourself.

–Switchoffpower.

–Sendanotherpersontogetmedicalaid.

Safetyinspectionguide

Thepurposeofthisinspectionguideistoassistyouinidentifyingpotentiallyunsafeconditions.Aseach

machinewasdesignedandbuilt,requiredsafetyitemswereinstalledtoprotectusersandservicetechnicians

frominjury.Thisguideaddressesonlythoseitems.Y oushouldusegoodjudgmenttoidentifypotential

safetyhazardsduetoattachmentofnon-ThinkPadfeaturesoroptionsnotcoveredbythisinspectionguide.

Ifanyunsafeconditionsarepresent,youmustdeterminehowserioustheapparenthazardcouldbeand

whetheryoucancontinuewithoutrstcorrectingtheproblem.

Considertheseconditionsandthesafetyhazardstheypresent:

•Electricalhazards,especiallyprimarypower(primaryvoltageontheframecancauseseriousorfatal

electricalshock)

•Explosivehazards,suchasadamagedCRTfaceorabulgingcapacitor

•Mechanicalhazards,suchaslooseormissinghardware

Todeterminewhetherthereareanypotentiallyunsafeconditions,usethefollowingchecklistatthebeginning

ofeveryservicetask.Beginthecheckswiththepoweroff,andthepowercorddisconnected.

Checklist:

1.Checkexteriorcoversfordamage(loose,broken,orsharpedges).

2.Poweroffthecomputer.Disconnectthepowercord.

3.Checkthepowercordfor:

a.Athird-wiregroundconnectoringoodcondition.Useametertomeasurethird-wireground

continuityfor0.1ohmorlessbetweentheexternalgroundpinandtheframeground.

b.Thepowercordshouldbethetypespeciedinthepartslist.

c.Insulationmustnotbefrayedorworn.

4.Checkforcrackedorbulgingbatteries.

5.Removethecover.

6.Checkforanyobviousnon-ThinkPadalterations.Usegoodjudgmentastothesafetyofany

non-ThinkPadalterations.

7.Checkinsidetheunitforanyobviousunsafeconditions,suchasmetallings,contamination,wateror

otherliquids,orsignsofreorsmokedamage.

8.Checkforworn,frayed,orpinchedcables.

9.Checkthatthepower-supplycoverfasteners(screwsorrivets)havenotbeenremovedortamperedwith.

Handlingdevicesthataresensitivetoelectrostaticdischarge

Anycomputerpartcontainingtransistorsorintegratedcircuits(ICs)shouldbeconsideredsensitiveto

electrostaticdischarge(ESD).ESDdamagecanoccurwhenthereisadifferenceinchargebetweenobjects.

ProtectagainstESDdamagebyequalizingthechargesothatthemachine,thepart,theworkmat,andthe

personhandlingthepartareallatthesamecharge.

Chapter1.Safetyinformation3

Notes:

1.Useproduct-specicESDprocedureswhentheyexceedtherequirementsnotedhere.

2.MakesurethattheESDprotectivedevicesyouusehavebeencertied(ISO9000)asfullyeffective.

WhenhandlingESD-sensitiveparts:

•Keepthepartsinprotectivepackagesuntiltheyareinsertedintotheproduct.

•Avoidcontactwithotherpeople.

•Wearagroundedwriststrapagainstyourskintoeliminatestaticonyourbody.

•Preventthepartfromtouchingyourclothing.Mostclothingisinsulativeandretainsachargeevenwhen

youarewearingawriststrap.

•Useagroundedworkmattoprovideastatic-freeworksurface.Thematisespeciallyusefulwhen

handlingESD-sensitivedevices.

•Selectagroundingsystem,suchasthoselistedbelow,toprovideprotectionthatmeetsthespecic

servicerequirement.

Note:TheuseofagroundingsystemtoguardagainstESDdamageisdesirablebutnotnecessary.

–AttachtheESDgroundcliptoanyframeground,groundbraid,orgreen-wireground.

–Whenworkingonadouble-insulatedorbattery-operatedsystem,useanESDcommongroundor

referencepoint.Y oucanusecoaxorconnector-outsideshellsonthesesystems.

–Usetheroundgroundprongoftheacplugonac-operatedcomputers.

Groundingrequirements

Electricalgroundingofthecomputerisrequiredforoperatorsafetyandcorrectsystemfunction.Proper

groundingoftheelectricaloutletcanbeveriedbyacertiedelectrician.

4ThinkPadT420andT420iHardwareMaintenanceManual

Safetynotices(multilingualtranslations)

Thesafetynoticesinthissectionareprovidedinthefollowinglanguages:

•English

•Arabic

•BrazilianPortuguese

•French

•German

•Hebrew

•Japanese

•Korean

•Spanish

•TraditionalChinese

DANGER

BeforethecomputerispoweredonafterFRUreplacement,makesureallscrews,springs,andothersmall

partsareinplaceandarenotleftlooseinsidethecomputer.Verifythisbyshakingthecomputerandlistening

forrattlingsounds.Metallicpartsormetalakescancauseelectricalshorts.

DANGER

Somestandbybatteriescontainasmallamountofnickelandcadmium.Donotdisassembleastandbybattery,

rechargeit,throwitintoreorwater,orshort-circuitit.Disposeofthebatteryasrequiredbylocalordinances

orregulations.Useonlythebatteryintheappropriatepartslisting.Useofanincorrectbatterycanresult

inignitionorexplosionofthebattery.

DANGER

Thebatterypackcontainssmallamountsofnickel.Donotdisassembleit,throwitintoreorwater,or

short-circuitit.Disposeofthebatterypackasrequiredbylocalordinancesorregulations.Useonlythe

batteryintheappropriatepartslistingwhenreplacingthebatterypack.Useofanincorrectbatterycanresult

inignitionorexplosionofthebattery.

DANGER

Thelithiumbatterycancauseare,anexplosion,orasevereburn.Donotrechargeit,removeitspolarized

connector,disassembleit,heatitabove100°C(212°F),incinerateit,orexposeitscellcontentstowater.

Disposeofthebatteryasrequiredbylocalordinancesorregulations.Useonlythebatteryintheappropriate

partslisting.Useofanincorrectbatterycanresultinignitionorexplosionofthebattery.

Chapter1.Safetyinformation5

DANGER

IftheLCDbreaksandtheuidfrominsidetheLCDgetsintoyoureyesoronyourhands,immediatelywash

theaffectedareaswithwaterforatleast15minutes.Seekmedicalcareifanysymptomsfromtheuidare

presentafterwashing.

DANGER

Toavoidshock,donotremovetheplasticcoverthatprotectsthelowerpartoftheinvertercard.

DANGER

Thoughthemainbatterieshavelowvoltage,ashortedorgroundedbatterycanproduceenoughcurrentto

burnpersonnelorcombustiblematerials.

DANGER

UnlesshotswapisallowedfortheFRUbeingreplaced,doasfollowsbeforeremovingit:poweroffthe

computer,unplugallpowercordsfromelectricaloutlets,removethebatterypack,anddisconnectany

interconnectingcables.

6ThinkPadT420andT420iHardwareMaintenanceManual

PERIGO

Chapter1.Safetyinformation7

AntesdeligarocomputadorapósasubstituiçãodaFRU,certique-sedequetodososparafusos,molase

outraspeçaspequenasestejamnolugarenãoestejamsoltosdentrodocomputador.Veriqueissosacudindo

ocomputadoreprocurandoouvirsonsdepeçassoltas.Peçasmetálicasoulascasdemetalpodemcausar

curto-circuito.

PERIGO

Algumasbateriasreservacontêmumapequenaquantidadedeníquelecádmio.Nãodesmonteumabateria

reserva,recarregue-a,jogue-anofogoounaágua,oudeixe-aentraremcurto-circuito.Descarteabateria

conformerequeridopelasleisouregulamentoslocais.Usesomenteabaterianasparteslistadasapropriadas.

Ousodeumabateriaincorretapoderesultaremcombustãoouexplosãodabateria.

PERIGO

Opacotedabateriacontémumapequenaquantidadedeníquel.Nãoodesmonte,jogue-onofogoouna

água,oudeixe-oentraremcurto-circuito.Descarteopacotedabateriaconformerequeridopelasleisou

regulamentoslocais.Usesomenteabaterianasparteslistadasapropriadasaosubstituiropacotedabateria.

Ousodeumabateriaincorretapoderesultaremcombustãoouexplosãodabateria.

PERIGO

Abateriadelítiopodecausarincêndio,explosãoougravesqueimaduras.Nãoarecarregue,removaseu

conectorpolarizado,desmonte-a,aqueça-aacimade100°C(212°F),incinere-a,ouexponhaoconteúdode

suacélulaàágua.Descarteabateriaconformerequeridopelasleisouregulamentoslocais.Usesomente

abaterianasparteslistadasapropriadas.Ousodeumabateriaincorretapoderesultaremcombustão

ouexplosãodabateria.

PERIGO

SeoLCDquebrareouidodedentrodeleentraremcontatocomseusolhosoucomsuasmãos,laveas

áreasafetadasimediatamentecomáguadurantepelomenos15minutos.Procurecuidadosmédicossealgum

sintomacausadopelouidosurgirapósalavagem.

PERIGO

Paraevitarchoqueelétrico,nãoremovaacapaplásticaqueprotegeaparteinferiordaplacainversora.

PERIGO

8ThinkPadT420andT420iHardwareMaintenanceManual

Emboraasprincipaisbateriaspossuambaixavoltagem,umabateriaemcurto-circuitoouaterradapode

produzircorrenteobastanteparaqueimarmateriaisdepessoalouinamáveis.

PERIGO

AmenosqueumahotswapsejapermitidaparaaFRUqueestásendosubstituída,façaoseguinteantesde

removê-la:desligueocomputador,desconectetodososcabosdeenergiadastomadas,removaopacotede

bateriasedesconectequaisquercabosdeinterconexão.

DANGER

Avantderemettrel'ordinateursoustensionaprèsremplacementd'uneunitéenclientèle,vériezquetousles

ressorts,visetautrespiècessontbienenplaceetbienxées.Pourcefaire,secouezl'unitéetassurez-vous

qu'aucunbruitsuspectneseproduit.Despiècesmétalliquesoudescopeauxdemétalpourraientcauser

uncourt-circuit.

DANGER

Certainesbatteriesdesecourscontiennentdunickeletducadmium.Nelesdémontezpas,nelesrechargez

pas,nelesexposezniaufeuniàl'eau.Nelesmettezpasencourt-circuit.Pourlesmettreaurebut,

conformez-vousàlaréglementationenvigueur.Lorsquevousremplacezlapiledesauvegardeoucellede

l'horlogetempsréel,veillezàn'utiliserquelesmodèlescitésdanslalistedepiècesdétachéesadéquate.Une

batterieouunepileinappropriéerisquedeprendrefeuoud'exploser.

DANGER

Labatteriecontientdunickel.Neladémontezpas,nel'exposezniaufeuniàl'eau.Nelamettezpasen

court-circuit.Pourlamettreaurebut,conformez-vousàlaréglementationenvigueur.Lorsquevousremplacez

labatterie,veillezàn'utiliserquelesmodèlescitésdanslalistedepiècesdétachéesadéquate.Eneffet,une

batterieinappropriéerisquedeprendrefeuoud'exploser.

DANGER

Lapiledesauvegardecontientdulithium.Elleprésentedesrisquesd'incendie,d'explosionoudebrûlures

graves.Nelarechargezpas,neretirezpassonconnecteurpolariséetneladémontezpas.Nel'exposezpasà

unetemperaturesupérieureà100°C,nelafaitespasbrûleretn'enexposezpaslecontenuàl'eau.Mettezla

pileaurebutconformémentàlaréglementationenvigueur.Unepileinappropriéerisquedeprendrefeuou

d'exploser.

Chapter1.Safetyinformation9

DANGER

Silepanneaud'afchageàcristauxliquidessebriseetquevousrecevezdanslesyeuxousurlesmainsune

partieduuide,rincez-lesabondammentpendantaumoinsquinzeminutes.Consultezunmédecinsides

symptômespersistentaprèslelavage.

DANGER

And'évitertoutrisquedechocélectrique,neretirezpaslecacheenplastiqueprotégeantlapartieinférieure

delacarted'alimentation.

DANGER

Bienquelevoltagedesbatteriesprincipalessoitpeuélevé,lecourt-circuitoulamiseàlamassed'une

batteriepeutproduiresufsammentdecourantpourbrûlerdesmatériauxcombustiblesoucauserdes

brûlurescorporellesgraves.

DANGER

Sileremplacementàchaudn'estpasautorisépourl'unitéremplaçablesursitequevousremplacez,

procédezcommesuitavantderetirerl'unité:mettezl'ordinateurhorstension,débrancheztousles

cordonsd'alimentationdesprisesdecourant,retirezleblocdebatterieetdéconnecteztouslescâbles

d'interconnexion.

VORSICHT

BevornacheinemFRU-AustauschderComputerwiederangeschlossenwird,mußsichergestelltwerden,daß

keineSchrauben,FedernoderandereKleinteilefehlenoderimGehäusevergessenwurden.DerComputermuß

geschütteltundaufKlappergeräuschegeprüftwerden.Metallteileoder-splitterkönnenKurzschlüsseerzeugen.

VORSICHT

DieBereitschaftsbatterie,diesichunterdemDiskettenlaufwerkbendet,kanngeringeMengenNickel

undCadmiumenthalten.SiedarfnurdurchdieVerkaufsstelleoderdenIBMKundendienstausgetauscht

werden.Siedarfnichtzerlegt,wiederaufgeladen,kurzgeschlossen,oderFeueroderWasserausgesetzt

werden.DieBatteriekannschwereVerbrennungenoderVerätzungenverursachen.BeiderEntsorgungdie

örtlichenBestimmungenfürSondermüllbeachten.BeimErsetzenderBereitschafts-oderSystembatterienur

BatteriendesTypsverwenden,derinderErsatzteillisteaufgeführtist.DerEinsatzfalscherBatterienkann

zuEntzündungoderExplosionführen.

10ThinkPadT420andT420iHardwareMaintenanceManual

VORSICHT

AkkusenthaltengeringeMengenvonNickel.Siedürfennichtzerlegt,wiederaufgeladen,kurzgeschlossen,

oderFeueroderWasserausgesetztwerden.BeiderEntsorgungdieörtlichenBestimmungenfürSondermüll

beachten.BeimErsetzenderBatterienurBatteriendesTypsverwenden,derinderErsatzteillisteaufgeführt

ist.DerEinsatzfalscherBatterienkannzuEntzündungoderExplosionführen.

VORSICHT

DieSystembatterieisteineLithiumbatterie.Siekannsichentzünden,explodierenoderschwereVerbrennungen

hervorrufen.BatteriendiesesTypsdürfennichtaufgeladen,zerlegt,über100°Cerhitztoderverbranntwerden.

AuchdarfihrInhaltnichtmitWasserinVerbindunggebrachtoderderzurrichtigenPolungangebrachte

Verbindungssteckerentferntwerden.BeiderEntsorgungdieörtlichenBestimmungenfürSondermüll

beachten.BeimErsetzenderBatterienurBatteriendesTypsverwenden,derinderErsatzteillisteaufgeführt

ist.DerEinsatzfalscherBatterienkannzuEntzündungoderExplosionführen.

VORSICHT

DieLeuchtstoffröhreimLCD-BildschirmenthältQuecksilber.BeiderEntsorgungdieörtlichenBestimmungen

fürSondermüllbeachten.DerLCD-BildschirmbestehtausGlasundkannzerbrechen,wennerunsachgemäß

behandeltwirdoderderComputeraufdenBodenfällt.WennderBildschirmbeschädigtistunddiedarin

bendlicheFlüssigkeitinKontaktmitHautundAugengerät,solltendiebetroffenenStellenmindestens15

MinutenmitWasserabgespültundbeiBeschwerdenanschließendeinArztaufgesuchtwerden.

VORSICHT

AusSicherheitsgründendieKunststoffabdeckung,diedenunterenTeilderSpannungswandlerplatineumgibt,

nichtentfernen.

VORSICHT

ObwohlHauptbatterieneineniedrigeSpannunghaben,könnensiedochbeiKurzschlußoderErdunggenug

Stromabgeben,umbrennbareMaterialienzuentzündenoderVerletzungenbeiPersonenhervorzurufen.

VORSICHT

Chapter1.Safetyinformation11

WenneinAustauschderFRUbeilaufendemBetriebnichterlaubtist,gehenSiebeimAustauschderFRUwie

folgtvor:SchaltenSiedenComputeraus,ziehenSiealleNetzkabelvondenNetzsteckdosenab,entfernen

SiedenAkkuundziehenSieallemiteinanderverbundenenKabelab.

12ThinkPadT420andT420iHardwareMaintenanceManual

Chapter1.Safetyinformation13

14ThinkPadT420andT420iHardwareMaintenanceManual

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Lenovo ThinkPad T420, ThinkPad T420i Hardware Maintenance Manual

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