Lenovo ThinkCentre A62 (English US/UK) User guide - Page 34

You might have to gently twist the heat sink and fan assembly to free it, from the microprocessor.

Page 34 highlights

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. Figure 16. Removing the heat sink and fan assembly 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. 26 User Guide

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5.
Disconnect the heat sink and fan assembly cable from the microprocessor fan
connector on the system board.
6.
Pivot the handle
±1²
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.
Figure 16. Removing the heat sink and fan assembly
26
User Guide