Lenovo ThinkStation S30 Hardware Maintenance Manual page 116

9. Remove the nine screws that secure the system board to the chassis by following the sequence shown
in the following illustration.
Figure 45. Removing the nine screws that secure the system board to the chassis
10. Slide the system board to the front of the computer and then carefully pivot the failing system board
upward to remove it out of the chassis.
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ThinkStation S30 Hardware Maintenance Manual