ThinkPad T420s - Battery pack replacement

SomemodelsoftheThinkPadT420sandT420siyouareservicingmighthavetheSIMcardthatthe
customerhasinstalled.
IfthecomputeryouareservicinghastheSIMcard,removeitbeforeyoustarttheservicing.
ToremovetheSIMcard,youneedtoremovethebatterypackfirst.(See1010Batterypack.)
Afteryoufinishtheservicing,makesurethatyouinsertthecardbackintotheslotfirmly.
Noticeondisconnectingthecablefromflip-lockZIFconnector:
SomecablesusedinThinkPadT420sandT420simodelsareconnectedtoflip-lockZIFconnectors.
Whendisconnectingacablefromtheflip-lockZIFconnector,doasshowninthisfigure.
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1010Batterypack
Importantnoticeforreplacingabatterypack:
68HardwareMaintenanceManual