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Electricalsafety
Observethefollowingruleswhenworkingonelectricalequipment.
Important:
Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoftmaterialthatdoes
notinsulateyouwhenworkingwithliveelectricalcurrents.
Manycustomershave,neartheirequipment,rubberoormatsthatcontainsmallconductiveberstodecrease
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
metaloorstripsandmachineframes.
Observethespecialsafetyprecautionswhenyouworkwithveryhighvoltages;Instructionsforthese
precautionsareinthesafetysectionsofmaintenanceinformation.Useextremecarewhenmeasuring
highvoltages.
•Regularlyinspectandmaintainyourelectricalhandtoolsforsafeoperationalcondition.
•Donotusewornorbrokentoolsandtesters.
•Neverassumethatpowerhasbeendisconnectedfromacircuit.First,checkthatithasbeenpoweredoff.
•Alwayslookcarefullyforpossiblehazardsinyourworkarea.Examplesofthesehazardsaremoistoors,
nongroundedpowerextensioncables,powersurges,andmissingsafetygrounds.
•Donottouchliveelectricalcircuitswiththereectivesurfaceofaplasticdentalmirror.Thesurfaceis
conductive;suchtouchingcancausepersonalinjuryandmachinedamage.
•Donotservicethefollowingpartswiththepoweronwhentheyareremovedfromtheirnormaloperating
placesinamachine:
–Powersupplyunits
–Pumps
–Blowersandfans
–Motorgenerators
–Similarunitstolistedabove
Thispracticeensurescorrectgroundingoftheunits.
•Ifanelectricalaccidentoccurs:
2ThinkPadT420andT420iHardwareMaintenanceManual
- ThinkPadT420andT420i 1
- HardwareMaintenanceManual 1
- FourthEdition(November2011) 2
- ©CopyrightLenovo2011 2
- Contents 3
- Chapter9.Locations........125 4
- AppendixA.Notices.........167 4
- Aboutthismanual 5
- Chapter1.Safetyinformation 7
- Electricalsafety 8
- Safetyinspectionguide 9
- Groundingrequirements 10
- Chapter1.Safetyinformation5 11
- .Safetyinformation7 13
- Chapter1.Safetyinformation9 15
- Chapter1.Safetyinformation11 17
- .Safetyinformation13 19
- .Safetyinformation15 21
- Chapter1.Safetyinformation17 23
- .Safetyinformation19 25
- .Safetyinformation21 27
- StrategyforreplacingFRUs 29
- Howtouseerrormessage 30
- Productdenition 31
- Chapter3.Generalcheckout 33
- Whattodorst 34
- Checkoutguide 35
- LenovoThinkVantageT oolbox 37
- FRUtests 39
- Powersystemcheckout 40
- Checkingtheacpoweradapter 40
- Checkingoperationalcharging 40
- Checkingthebatterypack 41
- Checkingthebackupbattery 41
- Voltage(Vdc) 42
- Red+2.5to+3.2 42
- Passwords 44
- Power-onpassword 44
- Hard-diskpassword 44
- Supervisorpassword 45
- Powermanagement 47
- Screenblankmode 47
- Sleep(standby)mode 47
- Hibernationmode 47
- Symptom-to-FRUindex 49
- Numericerrorcodes 49
- Errormessages 51
- Beepsymptoms 52
- No-beepsymptoms 52
- LCD-relatedsymptoms 52
- .Relatedserviceinformation47 53
- Intermittentproblems 54
- Undeterminedproblems 54
- Chapter5.Statusindicators 55
- .Statusindicators51 57
- Chapter6.Fnkeycombinations 59
- .Fnkeycombinations55 61
- Screwnotices 63
- Retainingserialnumbers 64
- RetainingtheUUID 65
- 1010Batterypack 69
- 1020ExpressCardblankbezel 70
- 3tocompletelyremoveit 71
- Capturescrew(1) 72
- 1050DIMMslotcover 75
- 1080Keyboard 79
- Installationstepsofkeyboard 80
- 1.Attachthekeyboardconnector 80
- .RemovingandreplacingaFRU75 81
- 1100Backupbattery 85
- .RemovingandreplacingaFRU85 91
- .RemovingandreplacingaFRU87 93
- 1130SmartCard 94
- 1140Modemdaughtercard(MDC) 96
- 1150Speakerassembly 97
- 1160LCDunit 99
- StepScrew(quantity)Color 100
- Black0.181Nm 100
- (1.85kgfcm) 100
- Black0.392Nm 101
- (4.0kgfcm) 101
- 1170Fanassembly 103
- 3tosecuretheCPU 107
- .RemovingandreplacingaFRU103 109
- 1200Magnesiumstructureframe 112
- .RemovingandreplacingaFRU107 113
- 1220mSATAsolidstatedrive 116
- .RemovingandreplacingaFRU111 117
- 2010LCDbezelassembly 118
- 2020LEDboard 119
- 2030Integratedcamera 121
- 2040LCDpanelandLCDcable 123
- 2050Cameracable 125
- .RemovingandreplacingaFRU121 127
- .RemovingandreplacingaFRU123 129
- Chapter9.Locations 131
- Rearview 133
- Bottomview 134
- Chapter10.Partslist 135
- .Partslist131 137
- .Partslist133 139
- .Partslist135 141
- .Partslist137 143
- .Partslist139 145
- .Partslist141 147
- .Partslist143 149
- .Partslist145 151
- .Partslist147 153
- .Partslist149 155
- .Partslist151 157
- .Partslist153 159
- Keyboard 160
- .Partslist155 161
- Miscellaneousparts 162
- .Partslist157 163
- Powercords 165
- Recoverydiscs 166
- Chapter10.Partslist161 167
- Chapter10.Partslist163 169
- Chapter10.Partslist165 171
- Commonservicetools 172
- AppendixA.Notices 173
- Electronicemissionsnotices 174
- Trademarks 175
- *0A60007_03* 178
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