Lenovo ThinkPad T420si Hardware Maintenance Manual - Page 102
as in the following figure. Either too much or too less application of grease can
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5 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. 7 6 8 Step 7 Screw (quantity) M2 × 5 mm, big-head, nylon-coated (4) Color Black Torque 0.181 Nm (1.85 kgfcm) 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 as in the following figure. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component. You need to peel the thin film off from the rubber b . 96 Hardware Maintenance Manual
5
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.
8
6
7
Step
Screw (quantity)
Color
Torque
7
M2 × 5 mm, big-head, nylon-coated (4)
Black
0.181 Nm
(1.85 kgfcm)
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
as in the following figure. Either too much or too less application of grease can
cause a thermal problem due to imperfect contact with a component. You need to peel the thin film
off from the rubber
b
.
96
Hardware Maintenance Manual