Lenovo T420 - Manual (Page 109)

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Step Screw (quantity) Color Torque
2 M2 × 5 mm, wafer-head, nylon-coated (8) Black 0.181 Nm
(1.85 kgfcm)
When installing: Make sure that the connector is attached firmly.
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When installing: Make sure that the wireless switch is adjusted as shown in callout a .
Chapter 8 . Removing and replacing a FRU 103