Contents
Aboutthismanual...........iii
Chapter1.Safetyinformation......1
Generalsafety................1
Electricalsafety...............2
Safetyinspectionguide............3
Handlingdevicesthataresensitivetoelectrostatic
discharge..................3
Groundingrequirements............4
Safetynotices(multilingualtranslations)......4
Lasercompliancestatement(multilingual
translations)................17
Chapter2.Importantservice
information..............25
StrategyforreplacingFRUs.........25
Strategyforreplacingaharddiskdrive...26
Importantnoticeforreplacingasystem
board................26
Howtouseerrormessage........26
StrategyforreplacingFRUsforCTO,CMV,and
GAV...................26
Productdenition............26
FRUidenticationforCTO,CMV,andGAV
products...............27
Chapter3.Generalcheckout.....29
Whattodorst..............29
Checkoutguide..............30
SystemsupportingtheLenovoThinkVantage
ToolboxprogramandthePC-DoctorforDOS
diagnosticsprogram..........30
SystemsupportingtheLenovodiagnostics
programs...............34
Powersystemcheckout...........36
Checkingtheacpoweradapter......36
Checkingoperationalcharging......37
Checkingthebatterypack........37
Checkingthebackupbattery.......38
Chapter4.Relatedservice
information..............39
RestoringthefactorycontentsbyusingRecovery
DiscSet.................39
Passwords................40
Power-onpassword...........40
Hard-diskpassword...........40
Supervisorpassword..........41
Howtoremovethepower-onpassword...41
Howtoremovethehard-diskpassword...41
Powermanagement............42
Screenblankmode...........42
Sleep(standby)mode..........42
Hibernationmode...........42
Symptom-to-FRUindex...........43
Numericerrorcodes..........44
Errormessages............44
No-beepsymptoms...........44
LCD-relatedsymptoms.........45
Intermittentproblems..........45
Undeterminedproblems.........45
Chapter5.Statusindicators.....47
Chapter6.Specialkeys........49
Chapter7.FRUreplacement
notices................51
Screwnotices...............51
Retainingserialnumbers...........52
Restoringtheserialnumberofthesystem
unit.................52
RetainingtheUUID...........53
ReadingorwritingtheECAinformation...53
Chapter8.Removingandreplacinga
FRU..................55
BeforeservicingThinkPadEdgeE420models..55
1010Batterypack.............56
1020ExpressCardblankbezel........57
1030Bottomslotcover...........58
1040Opticaldriveortravelcover.......59
1050Memorymodules...........60
1060Harddiskdriveassembly........61
1070PCIExpressMiniCardforwirelessLAN..63
1080PCIExpressMiniCardforwirelessWAN..64
1080mSATAsolidstatedrive.........65
1090Backupbattery............66
1110Keyboard..............67
1120Topcaseassembly...........68
1130Bluetoothdaughtercard........71
1140Expresssubcard...........72
1150Speakerassembly...........73
1160Systemboardassemblyandfanassembly.74
1170CPU................80
1180DC-insubcardandbasecoverassembly..81
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