Name: Lenovo ThinkPad X220 Tablet
Brand: Lenovo
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•T orquedriver

Ifyouhaveatorquedriver,refertotheTorquecolumninthescrewinformationtableforeachstep.

•Makesurethatyouusethecorrectscrew.Itisrecommendedtousenewscrewsforreplacements.If

youhaveatorquescrewdriver,tightenallscrewsrmlytothetorquespeciedinthescrewinformation

tableforeachstep.

•Ensuretorquescrewdriversarecalibratedcorrectlyfollowingcountryspecications.

Retainingserialnumbers

Thissectionincludesthefollowingdescriptions:

•“Restoringtheserialnumberofthesystemunit”onpage58

•“RetainingtheUUID”onpage59

•“ReadingorwritingtheECAinformation”onpage59

Restoringtheserialnumberofthesystemunit

Whenthecomputerwasmanufactured,theEEPROMonthesystemboardwasloadedwiththeserial

numbersofthesystemandallmajorcomponents.Thesenumbersneedtoremainthesamethroughout

thelifeofthecomputer.

Ifyoureplacethesystemboard,youmustrestoretheserialnumberofthesystemunittoitsoriginalvalue.

Beforereplacingthesystemboard,savetheoriginalserialnumberbydoingthefollowing:

1.InstalltheLENOVOThinkPadHardwareMaintenanceDisketteVersion1.76orlater,andrestartthe

computer.

2.Fromthemainmenu,select1.SetSystemIdentication.

3.Select2.ReadS/NdatafromEEPROM.

Theserialnumberofeachdeviceinyourcomputerisdisplayed;theserialnumberofthesystemunitis

listedasfollows:

•20:Serialnumber

Writedownthatnumber.

Note:Theserialnumberofthesystemunitisalsowrittenonthelabelattachedtothebottomofthecomputer.

Afteryouhavereplacedthesystemboard,restoretheserialnumberbydoingthefollowing:

1.InstalltheLENOVOThinkPadHardwareMaintenanceDisketteVersion1.76orlaterandrestartthe

computer.

2.Fromthemainmenu,select1.SetSystemIdentication.

3.Select1.AddS/NdatafromEEPROM.Followtheinstructionsonthescreen.

IftheMTMandProductIDnumbersdifferfromeachotherontherearlabel,usewhatisshownforthe

ProductIDeld.Seeexamplebelow:

58HardwareMaintenanceManual

Lenovo ThinkPad X220 Tablet Hardware Maintenance Manual

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