Lenovo ThinkPad P51 User Manual page 140

6. Align the contact edge of the new wireless-WAN card with the key in the slot. Then carefully insert the
1
new wireless-WAN card into the slot at an angle of about 20 degrees . Pivot the wireless-WAN card
downward 2 . Install the screw to secure the wireless-WAN card in place 3 . Connect the cables to the
wireless-WAN card 4 . Ensure that you attach the red cable to the main connector and the blue cable to
the auxiliary connector on the wireless-WAN card.
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P51 User Guide