Manual
BeforeservicingThinkPadT420andT420i
SomemodelsoftheThinkPadT420andT420iyouareservicingmighthavetheSIMcardthatthecustomer
hasinstalled.
IfthecomputeryouareservicinghastheSIMcard,removeitbeforeyoustarttheservicing.
ToremovetheSIMcard,youneedtoremovethebatterypackrst.(See“1010Batterypack”onpage63.)
Afteryounishtheservicing,makesurethatyouinsertthecardbackintotheslotrmly.
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62ThinkPadT420andT420iHardwareMaintenanceManual