Lenovo ThinkPad T420si Hardware Maintenance Manual page 102

In step 5 , remove the system board with fan assembly together from the base cover assembly.
Turn the system board over, and then disconnect the fan assembly from the system board.
Step Screw (quantity)
7
M2 × 5 mm, big-head, nylon-coated (4)
When installing:
• Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams,
on the part marked a
cause a thermal problem due to imperfect contact with a component. You need to peel the thin film
off from the rubber b
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Hardware Maintenance Manual
as in the following figure. Either too much or too less application of grease can
.
Color Torque
Black 0.181 Nm
(1.85 kgfcm)