Lenovo T420 Maintenance Manual page 110

Table 27. 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 grams, on the
parts marked as in the following igures. Either too much or too less application of grease can cause a thermal
a
problem due to imperfect contact with a component. For the fan in the integrated graphics models, you need to
peel the thin ilm off from the thermal rubber marked
For Discrete Graphics models:
For Integrated Graphics models:
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ThinkPad T420 and T420i Hardware Maintenance Manual
.
b
a
a
b