Before servicing the computerCarefully read this topic before servicing the computer.Disabling the built-in batteryBefore replacing any FRU, ensure that you have disabled the built-in battery by doing the following:1. Turn off your computer and disconnect the ac power adapter and all cables from the computer.2. Turn on your computer. Press F1 to enter ThinkPad Setup when the ThinkPad logo is displayed.3. Select Config ➙ Power. The Power submenu is displayed.4. Select Disable built-in battery.5. Click Yes in the Setup Warning window. Then the computer turns off automatically. Wait three tofive minutes to let the computer cool.1010 Lenovo OneLink connector coverRemoval steps of the Lenovo OneLink connector coverRemove the connector cover as shown in the following illustration.1Note: Ensure that you reattach the connector cover to the Lenovo OneLink connector after finishing theservicing.1020 Base cover assemblyRemoval steps of the base cover assemblyRemove the screws 1 , then lift the base cover assembly 2 , and then remove the base cover assemblyin the direction 3 as shown.58 Hardware Maintenance Manual