Lenovo ThinkPad L420 Hardware Maintenance Manual page 73

Table 8. Removal steps of fan assembly (continued)
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 .
For models with a discrete fan assembly:
a
For models with an integrated fan assembly:
67
.
Chapter 8 Removing and replacing a FRU