Lenovo T420 Maintenance Manual page 122

Table 31. Removal steps of system board and ExpressCard slot assembly (continued)
Step Screw (quantity)
M2 × 3 mm, wafer-head, nylon-coated (1)
1
When installing: Make sure that the connector is attached irmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Torque
Color
Black 0.181 Nm
(1.85 kgfcm)