Lenovo ThinkPad T540p Hardware Maintenance Manual page 72

Removal steps of the wireless WAN card
Detach the connectors, and then remove the screw
Step Screw (quantity)
2
M2 × 3 mm, flat-head, nylon-coated (1)
When installing:
Plug the red cable into the connector labeled MAIN on the card; and plug the blue cable into the connector
labeled AUX on the card.
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Hardware Maintenance Manual
2 .
2
1
Color
Black
3
1
Torque
0.181 Nm
(1.85 kgf-cm)