Lenovo ThinkStation C20 User Manual page 36

5. Depending on the heat sink and fan assembly you want to replace, do one of the following:
• If you are replacing heat sink and fan assembly 1, go to step 6.
• If you are replacing heat sink and fan assembly 2, do the following:
a. Remove the optical drive. See "Replacing the optical drive" on page 27.
b. Pivot the optical drive bracket as shown in the following illustration and then remove it from
the chassis. Go to step 6.
Figure 27. Removing the optical drive bracket
6. Disconnect the heat sink and fan assembly cable from the system board. Note the cable location.
7. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw
b. Partially remove screw
Note: Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink and fan assembly.
30
ThinkStation User Guide
1
, then fully remove screw
3 , then fully remove screw
2
, and then fully remove screw
4 , and then fully remove screw
1
.
3 .