Before Servicing The Computer; Removing External Devices; Disabling The Built-In Battery; Removing The Nano-Sim Card - Lenovo 20KF Hardware Maintenance Manual

Before servicing the computer

Carefully read this topic before servicing the computer.

Removing external devices

Before you start servicing, ensure that you remove all external devices installed by the customer, such as
microSD card, dock, and external display.

Disabling the built-in battery

Before replacing any FRU/CRU, ensure that you disable the built-in battery.
To disable Fast Startup, do the following:
1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small
icons.
2. Click Power Options, and then click Choose what the power buttons do on the left pane.
3. Click Change settings that are currently unavailable at the top.
4. If prompted by User Account Control (UAC), click Yes.
5. Clear the Turn on fast startup check box, and then click Save changes.
To disable the built-in battery, do the following:
1. Restart your computer. When the logo screen is displayed, immediately press F1 to enter ThinkPad
Setup.
2. Select Config ➙ Power. The Power submenu is displayed.
3. Select Disable built-in battery and press Enter.
4. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off
automatically. Wait three to five minutes to let the computer cool.

Removing the nano-SIM card

If the computer has a nano-SIM card installed, remove the nano-SIM card before you start the servicing.
After you finish the servicing, ensure that you install the nano-SIM card (if available) back into the computer.

Removing the microSD card

If the computer has a microSD card installed, remove the microSD card before you start the servicing.
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X280 Hardware Maintenance Manual