Lenovo ThinkPad S540 Hardware Maintenance Manual page 107

Step Screw (quantity)
3
M2 × 3.5 mm, wafer-head, nylon-coated (2)
Antenna locations
a Wireless LAN main antenna (black)
b Wireless LAN auxiliary antenna (gray)
Color
Black
a
b
Chapter 9
Torque
0.392 Nm
(4.00 kgf-cm)
.
Removing or replacing a FRU
101