Lenovo ThinkPad T420 2620 Hardware 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
a
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 fan in the integrated graphics models, you need to
peel the thin film 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