Lenovo ThinkPad Edge E420 Hardware Maintenance Manual page 87

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 shown in the following figures. 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 rubbers marked b .
For models with a discrete fan assembly
For models with an integrated fan assembly
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Chapter 8 Removing and replacing a FRU