Lenovo ThinkServer TD350 User Manual And Hardware Maintenance Manual page 190

17. Install the new system board into the chassis. Align the holes in the new system board with the
corresponding mounting studs on the chassis. Then, move the system board towards the rear of the
server. Ensure that the rear connectors on the new system board are inserted into the corresponding
holes in the rear panel. Tighten the two screws to secure the system board in place
Figure 144. Installing the system board
18. Remove the microprocessors from the old system board and install them on the new system board. See
"Installing or replacing the microprocessor" on page 138.
19. Use a cleaning pad to wipe the thermal grease from the heat sinks and the top of the microprocessors.
Dispose of the cleaning pad after all of the thermal grease is removed.
20. Use one of the following methods to apply appropriate amount of thermal grease to the top of the
microprocessors in the shape of a cross or a circle as shown. Using too much or too little thermal grease
can cause a thermal problem due to imperfect contact with the components.
Notes:
• Do not touch the thermal grease.
• Keep the thermal grease off the system board.
Figure 145. Applying the thermal grease to the top of the microprocessor
21. Install the heat sinks on the new system board. See "Replacing the heat sink" on page 169.
22. The old system board must be returned with two microprocessor socket covers to protect the pins on
the microprocessor sockets during shipping and handling. Use the microprocessor socket covers
removed from the new system board.
To install a microprocessor socket cover on the old system board, do the following:
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ThinkServer TD350 User Guide and Hardware Maintenance Manual