
Notes:
•Makesurethatyouusethecorrectscrew.Ifyouhaveatorquescrewdriver,tightenallscrewsrmlytothe
torqueshowninthetableforeachstepinChapter8“RemovingandreplacingaFRU”onpage49.Never
useascrewthatyouremoved.Useanewone.Makesurethatallofthescrewsaretightenedrmly.
•Ensuretorquescrewdriversarecalibratedcorrectlyfollowingcountryspecications.
Retainingserialnumbers
Thistopicprovidesinstructionsonthefollowing:
•“Restoringtheserialnumberofthesystemunit”onpage46
•“RetainingtheUUID”onpage47
•“ReadingorwritingtheECAinformation”onpage47
Restoringtheserialnumberofthesystemunit
Whenthecomputerwasmanufactured,theEEPROMonthesystemboardwasloadedwiththeserial
numbersofthesystemandallmajorcomponents.Thesenumbersneedtoremainthesamethroughout
thelifeofthecomputer.
Ifyoureplacethesystemboard,youmustrestoretheserialnumberofthesystemboardtoitsoriginalvalue.
Beforereplacingthesystemboard,savetheoriginalserialnumberbydoingthefollowing:
1.InstalltheLENOVOThinkPadHardwareMaintenanceDisketteVersion1.76orlater,andrestartthe
computer.
2.Fromthemainmenu,select1.SetSystemIdentication.
3.Select2.ReadS/NdatafromEEPROM.
Theserialnumberofeachdeviceinyourcomputerisdisplayed.Theserialnumberofthesystemboardis
listedislistedas20:Serialnumber.
Writedownthatnumber.
Note:Theserialnumberofthesystemboardisalsowrittenonthelabelattachedtothebottomofthe
computer.
Afteryouhavereplacedthesystemboard,restoretheserialnumberbydoingthefollowing:
1.InstalltheLENOVOThinkPadHardwareMaintenanceDisketteVersion1.76orlaterandrestartthe
computer.
2.Fromthemainmenu,select1.SetSystemIdentication.
3.Select1.AddS/NdatafromEEPROM.Followtheinstructionsonthescreen.
IftheMTMandProductIDnumbersdifferfromeachotherontherearlabel,usewhatisshownforthe
ProductIDeld.Seeexamplebelow:
46HardwareMaintenanceManual
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