Lenovo T420 - Manual (Page 92)

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When installing: Make sure that the connectors are attached firmly.
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Step Screw (quantity) Color Torque
13 M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm
(1.85 kgfcm)
86 ThinkPad T420 and T420i Hardware Maintenance Manual