Lenovo 3658 - Manual (Page 38)

5. Pivot the handle 1 to release the heat sink clamp and then disengage the
clamp from the plastic retention bracket.
Note: The system board for your computer might look different to the one
illustrated below.
Note: You might have to gently twist the heat sink and fan assembly to free it
from the microprocessor.
6. Lift the failing heat sink and fan assembly off the system board.
7. Remove the mylar film that covers the greased side of the new heat sink and
fan assembly that will face the microprocessor.
Figure 26. Removing the heat sink and fan assembly held in place by a clamp
30 User Guide