Lenovo ThinkPad T540p User Manual page 97

6. Remove the screw. The wireless WAN card is released from the secured position and pivots upward.
7. Carefully remove the wireless WAN card out of the slot.
8. Align the contact edge of the new wireless WAN card with the key in the slot. Then carefully insert the
new wireless WAN card into the slot at an angle of about 20 degrees.
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Chapter 6 Replacing devices