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13. Remove the heat sink(s) and place them on a clean, at, and static-protective surface. See “Installing or
replacing a heat sink” on page 104.
14. Disconnect all cables from the system board. Then, remove the ten screws that secure the system
board following the recommended numerical sequence as shown.
Note: The screws 9 and 10 are different from the other eight screws. Reinstall the two screws to the
same positions after you install the new system board.
Figure118. Removing the screws that secure the system board
148 ThinkServer RD540 User Guide and Hardware Maintenance Manual