Lenovo ThinkPad T540p Hardware Maintenance Manual page 82

When installing:
Ensure that the connector is attached firmly.
Removal steps of the fingerprint reader
Step Screw (quantity)
1
M2 × 3 mm, flat-head, nylon-coated (2)
76
Hardware Maintenance Manual
Color Torque
0.181 Nm
Silver
(1.85 kgf-cm)