Lenovo ThinkCentre Edge 91 Hardware Maintenance Manual (HMM) (April 2012) - Th - Page 104
contacts on the microprocessor socket.
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17. Install all memory modules and PCI cards removed from the failing system board on the new system board. See "Installing or replacing a memory module" on page 85 and "Installing or replacing a PCI card" on page 82. 18. Reconnect all remaining cables to the system board. See "Locating parts on the system board" on page 77. 19. To complete the replacement, go to "Completing the parts replacement" on page 104. The failing system board must be returned with a microprocessor socket cover to protect the pins during shipping and handling. To install the microprocessor socket cover, do the following: 1. Release the lever securing the microprocessor retainer and open the retainer to access the microprocessor. 2. Grasp the microprocessor on the sides and lift it straight up and out of the socket. Do not touch the contacts on the microprocessor socket. 3. Note the orientation of the socket cover. Align the notches 1 of the microprocessor socket cover with the alignment keys 2 of the microprocessor socket. 4. Install one side of the socket cover into the microprocessor socket as shown. Figure 29. Installing the socket cover Note: Your microprocessor socket and cover might look slightly different from the illustration. 100 ThinkCentre Hardware Maintenance Manual