Lenovo 5393 - Manual (Page 34)

6. Remove the four screws 1 that secure the heat sink and fan assembly to the
system board.
Note: Carefully remove the four screws from the system board to avoid any
possible damage. The four screws cannot be removed from the heat
sink and fan assembly.
7. Lift the heat sink and fan assembly off the system board.
Notes:
a. You might have to gently twist the heat sink and fan assembly to free it
from the microprocessor.
b. When handling the heat sink and fan assembly, do not touch the thermal
grease on the bottom of the heat sink and fan assembly.
8. Place the new heat sink and fan assembly on the system board so that the
four screws are aligned with the corresponding holes in the system board.
Make sure that you place the new heat sink and fan assembly correctly so that
you can easily connect the heat sink and fan assembly cable to the
microprocessor fan connector on the system board.
9. Alternate tightening each screw a small and equal amount until the heat sink
and fan assembly is secured to the system board. Do not over-tighten the
screws.
10. Connect the new heat sink and fan assembly cable to the microprocessor fan
connector on the system board. See “Locating parts on the system board” on
page 12.
Figure 16. Screws that secure the heat sink and fan assembly
26 User Guide