Lenovo ThinkPad T550 (English) Hardware Maintenance Manual - ThinkPad T550, W5 - Page 62

Before servicing the computer, Disabling the built-in battery, Removing the micro 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. When the ThinkPad logo is displayed, immediately press F1 to enter ThinkPad Setup. 3. Select Config ➙ Power. The Power submenu is displayed. 4. Select Disable built-in battery and press Enter. 5. 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 micro SIM card For access, remove this FRU: • "1010 Removable battery" on page 57 If the computer has a micro SIM card installed, you also must remove the micro SIM card before you start the servicing. 1 2 After you finish the servicing, ensure that you install the micro SIM card (if available) into the micro SIM card slot. Removing a major FRU This section provides instructions on how to remove a major FRU. 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. When the ThinkPad logo is displayed, immediately press F1 to enter ThinkPad
Setup.
3. Select
Config
➙
Power
. The
Power
submenu is displayed.
4. Select
Disable built-in battery
and press Enter.
5. 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 micro SIM card
For access, remove this FRU:
• “1010 Removable battery” on page 57
If the computer has a micro SIM card installed, you also must remove the micro SIM card before you
start the servicing.
1
2
After you finish the servicing, ensure that you install the micro SIM card (if available) into the micro SIM
card slot.
Removing a major FRU
This section provides instructions on how to remove a major FRU.
56
Hardware Maintenance Manual