14. Reinstall the system fan. See “Replacing the system fan” on page 229.15. If you have removed the Wi-Fi card module, reinstall the Wi-Fi card module. See “Replacing the Wi-Ficard module” on page 219.16. Install all memory modules removed from the failing system board onto the new system board. See“Installing or replacing a memory module” on page 215.17. Reinstall the hard disk drive assembly. See “Installing or removing the hard disk drive assembly” onpage 213.18. Refer to your record to connect cables to the new system board. You also can refer to “Locatingparts on the system board” on page 87 to help you locate the connectors on the system board andconnect cables.19. To complete the replacement, go to “Completing the parts replacement” on page 239.The failing system board must be returned with a microprocessor socket cover to protect the pins duringshipping and handling.To install the microprocessor socket cover, do the following:1. After you have removed the microprocessor from the failing system board, close the microprocessorretainer and then put the lever to the locked position to secure the retainer in place.2. Note the orientation of the socket cover, and install one side of the socket cover into the microprocessorsocket. Carefully press the other side of the socket cover downward until the socket cover snapsinto position.Note: Your microprocessor socket and cover might look slightly different from the illustration.Figure209. Installing the microprocessor socket cover3. Carefully check the four corners of the socket cover to ensure that the cover is seated securely.4. Follow any additional instructions that are included with the replacement part you received.Replacing the keyboard or mouseAttention:Do not open your computer or attempt any repair before reading and understanding the “Important safety information”on page 1.This section provides instructions on how to replace the keyboard or mouse.To replace the keyboard or mouse, do the following:1. Disconnect the old keyboard cable or mouse cable from the computer.238 ThinkCentre M73 Hardware Maintenance Manual
