Lenovo ThinkPad Edge E420 Hardware Maintenance Manual page 94

Step Screw (quantity)
2
M2.5 × 6 mm, wafer-head, nylon-coated (2)
When installing: Make sure that the connector is attached firmly to the system board.
In step 5 , release wireless antenna cables from the cable guides.
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Hardware Maintenance Manual
Color Torque
Black 0.392 Nm
(4 kgfcm)