Lenovo ThinkCentre A62 User Manual page 34

Figure 16. Removing the heat sink and fan assembly
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User Guide
5. Disconnect the heat sink and fan assembly cable from the microprocessor fan
connector on the system board.
6. Pivot the handle 1 to release the heat sink and fan assembly clamp and then
disengage the clamp from the plastic retention bracket.
Note: You might have to gently twist the heat sink and fan assembly to free it
from the microprocessor.
7. Lift the failing heat sink and fan assembly off the system board.