Before Servicing The Computer; Disabling The Built-In Battery; Removing The Sim Card Tray - Lenovo ThinkPad X240 Hardware Maintenance Manual

Before servicing the computer

Carefully read this topic before servicing the computer.

Disabling the built-in battery

Before replacing any FRU, ensure that you have disabled the built-in battery by doing the following:
1. Turn off the computer and disconnect the ac power adapter and all cables from the computer.
2. Turn on the computer. When the ThinkPad logo is displayed, press F1 continuously to enter the
ThinkPad Setup program.
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 to five
minutes to let the computer cool.
The battery will be automatically enabled when the ac power adapter is reconnected to the computer.

Removing the SIM card tray

Before you start the servicing, remove the SIM card tray with the installed SIM card or dummy SIM card
from the computer.
After you finish the servicing, ensure that you install the SIM card tray with the SIM card or dummy SIM
card back into the computer.
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