Lenovo ThinkStation S20 - Manual (Page 38)

To replace the heat sink and fan assembly:
1. Remove the computer cover. See “Removing the computer cover” on page 11.
2. Lay the computer on its side for easier access to the heat sink and fan assembly.
3. Remove the heat sink and fan assembly cable from the system board. Note the cable location. See
“Identifying parts on the system board” on page 10.
4. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 .
b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 .
Note: The four screws can be removed from the system board, but they cannot be removed from the
heat sink and fan assembly.
Figure 28. Removing the heat sink and fan assembly
5. Carefully 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. Do not touch the thermal grease while handling the heat sink and fan assembly.
6. Remove the plastic cover from the bottom of the new heat sink and fan assembly to expose the thermal
grease (this cover protects the thermal grease from contamination).
Notes:
32 ThinkStation Hardware Installation and Replacement Guide