3. Insert the system board into the chassis and slide it toward the rear of the
server until the tabs on the fan sink mounting bracket is fully engaged in the
holes for fan sink mounting bracket slots 1 on the bottom the chassis.
Note: The tabs are fully engaged when the screw holes in the system board
are aligned with the corresponding holes in the chassis.
126 ThinkServer TS100 Types 6431, 6432, 6433, and 6434: Hardware Maintenance Manual