Lenovo ThinkPad X240 User Manual page 100

DANGER
Electric current from power, telephone, and communication cables is hazardous. To avoid shock
hazard, disconnect the cables before opening the cover of this slot.
Attention: Before you start installing an M.2 wireless-LAN 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.
To replace the M.2 wireless-LAN card, do the following:
1. Disable the built-in batteries. See "Disabling the built-in battery" on page 73.
2. Close the computer display, and turn the computer over.
3. Remove the battery pack. See "Replacing the battery pack" on page 75.
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.
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User Guide
1 . Then remove the base cover assembly 2 .