ThinkPad T420 - Default Chapter; Table of Contents

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
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