Lenovo ThinkCentre A61 Hardware Maintenance Manual page 136

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Hardware Maintenance Manual
4. Rotate handle 1 to release the heat sink clamp and then disengage the
clamp from the plastic retention bracket.
5. Lift the heat sink and fan assembly off the system board. Place the heat sink
on its side so that the thermal grease does not come in contact with anything.
Note: You might have to gently twist the heat sink to free it from the
microprocessor.
6. To release the microprocessor 2 from the system board socket, lift the small
handle 1 .