Lenovo ThinkServer RD350G User Manual And Hardware Maintenance Manual page 154

17. Install the new system board into the chassis and press the system board to the rear of the server.
Ensure that:
• The new system board is engaged by the mounting stud on the chassis.
• The rear connectors on the new system board are inserted into the corresponding holes in the
rear panel.
Figure 117. 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 97.
Note: Do not drop anything onto the microprocessor socket on the old system board while it is exposed.
The socket pins must be kept as clean as possible.
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. Either too much or too less application of
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 118. Applying the thermal grease to the top of the microprocessor
21. Install the heat sinks on the new system board. See "Installing or replacing a heat sink" on page 95.
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ThinkServer RD350G User Guide and Hardware Maintenance Manual