Lenovo ThinkPad T431s Hardware Maintenance Manual - Page 62

Before servicing the computer, Disabling the built-in battery, Removing the SIM card

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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 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 to five minutes to let the computer cool. Removing the SIM card Some models you are servicing might have a SIM card that a customer has installed. If the computer you are servicing has a SIM card installed, remove it before you start the servicing. 1 2 3 After you finish the servicing, ensure that you install the card back into the SIM card tray firmly. 56 Hardware Maintenance Manual

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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 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 to
five minutes to let the computer cool.
Removing the SIM card
Some models you are servicing might have a SIM card that a customer has installed. If the computer you are
servicing has a SIM card installed, remove it before you start the servicing.
2
1
3
After you finish the servicing, ensure that you install the card back into the SIM card tray firmly.
56
Hardware Maintenance Manual