Lenovo T420i Technical Information download pdf (Page 3)

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

DiagnosticsusingPC-DoctorforDOS....29

LenovoThinkVantageToolbox.......31

FRUtests...............33

Powersystemcheckout...........34

Checkingtheacpoweradapter......34

Checkingoperationalcharging......34

Checkingthebatterypack........35

Checkingthebackupbattery.......35

Chapter4.Relatedservice

information..............37

RestoringthefactorycontentsbyusingRecovery

DiscSet.................37

Passwords................38

Power-onpassword...........38

Hard-diskpassword...........38

Supervisorpassword..........39

Howtoremovethepower-onpassword...39

Howtoremovethehard-diskpassword...39

Powermanagement............41

Screenblankmode...........41

Sleep(standby)mode..........41

Hibernationmode...........41

Symptom-to-FRUindex...........43

Numericerrorcodes..........43

Errormessages............45

Beepsymptoms............46

No-beepsymptoms...........46

LCD-relatedsymptoms.........46

Intermittentproblems..........48

Undeterminedproblems.........48

Chapter5.Statusindicators.....49

Chapter6.Fnkeycombinations...53

Chapter7.FRUreplacement

notices................57

Screwnotices...............57

Retainingserialnumbers...........58

Restoringtheserialnumberofthesystem

unit.................58

RetainingtheUUID...........59

ReadingorwritingtheECAinformation...59

Chapter8.Removingandreplacinga

FRU..................61

BeforeservicingThinkPadT420andT420i...62

1010Batterypack.............63

1020ExpressCardblankbezel........64

1030SerialUltrabayEnhanceddeviceortravel

bezel..................65

1040Harddiskdrive(HDD)andsolidstatedrive

(SSD)..................66

1050DIMMslotcover............69

1060DIMM(intheslotontheundersideofthe

computer)................70

1070PCIExpressMiniCardforwirelessWAN..71

1080Keyboard..............73

1090DIMM(intheslotunderthekeyboard)...77

1100Backupbattery............79

1110PCIExpressMiniCardforwirelessLAN..81

1120Keyboardbezelassembly,FPCcable,and

Bluethoothdaughtercard..........83

1130SmartCard..............88

1140Modemdaughtercard(MDC).......90

1150Speakerassembly...........91

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