Lenovo THINKPAD L420 Hardware Maintenance Manual page 73

Table 16. Removal steps of fan assembly (continued)
2a 2d
Note: Loosen the screws to in order, but do not remove them. When you attach the fan, secure the screws in
order.
2
Note: Different models might have different numbers of screws in step .
When installing: Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2
a
grams, on the parts marked as 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. For the new CPU thermal device, you need
b
to peel the thin film off from the rubbers marked .
67
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Chapter 8 Removing and replacing a FRU