Lenovo ThinkPad X240 User Manual page 97

Attention: Before you start installing an M.2 wireless-WAN card, touch a metal table or a grounded metal
object. This action reduces any static electricity from your body. Static electricity could damage the card.
Some computers might come with an M.2 wireless-WAN card. To replace the wireless-WAN card, do
the following:
1. Disable the built-in batteries. See "Disabling the built-in battery" on page 67.
2. Close the computer display, and turn the computer over.
3. Remove the battery pack. See "Replacing the battery pack" on page 69.
4. Loosen the screws that secure the base cover assembly
5. If a tool is provided with the new card to help you disconnect cables, use the tool to disconnect the
cables from the old card. If no such a tool is provided, hold the cable connector with your fingers and
gently disconnect each cable from the old card.
1
. Then remove the base cover assembly
Chapter 6
2
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81
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Replacing devices