Lenovo ThinkStation C20 Hardware Maintenance Manual - ThinkStation C20/C20x - Page 97

and then fully remove screw, b. Partially remove screw

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b. Pivot the optical drive bracket as shown in the following illustration and then remove it from the chassis. Go to 6 on page 91. 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 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: 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. Chapter 9. Replacing FRUs 91

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b. Pivot the optical drive bracket as shown in the following illustration and then remove it from
the chassis. Go to 6 on page 91.
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
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:
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.
Chapter 9
.
Replacing FRUs
91