Lenovo ThinkPad T420s Hardware Maintenance Manual page 111

Removal steps of integrated camera, microphone, or hall sensor card
Step Screw (quantity)
1
M2 × 3 mm, small-head, nylon-coated (1)
When installing:
Make sure that the connector of the integrated camera, microphone, or the hall sensor card is attached firmly.
Downloaded from LpManual.com Manuals
1
Color Torque
Silver 0.181 Nm
(1.85 kgf-cm)
.
Chapter 8 Removing and replacing a FRU
105