Lenovo ThinkCentre M51 Hardware Maintenance Manual - Page 153
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9. Reinstall the PCI riser card and any adapters. 10. Lower the drive bay assembly into the normal position. 11. To complete the installation, go to "Closing the cover and connecting cables" on page 159. Removing and replacing the microprocessor Important To allow the thermal interface between the microprocessor and the heat sink time to cool down, turn off the computer at least one hour before removing the microprocessor. Note: This procedure is also used when replacing a failing system board. When you receive a new microprocessor, you will also receive a new heat sink and vacuum pen for handling the microprocessor. You must install the new heat sink when replacing the microprocessor. If you use the old heat sink with the new microprocessor, the computer might over heat. 1. Open the cover. See "Opening the cover" on page 138. Chapter 10. Replacing FRUs (Types 8098, 8171, 8172, 8173, 8424, and 8425) 147