Lenovo ThinkCentre A58 User Manual - Page 108

c. Touch only the sides of the microprocessor. Do not touch the gold contacts on the bottom. d. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept as clean as possible. Figure 18. Removing the microprocessor 9. Make sure that the small handle is in the raised position and the microprocessor retainer is fully open. 10. Remove the protective cover 2 that protects the gold contacts on the new microprocessor 1 . 11. Hold the new microprocessor and align the notches on it with the tabs in the microprocessor socket, or align the small triangle on one corner with the corresponding beveled corner of the microprocessor socket. 12. Lower the new microprocessor straight down into the microprocessor socket on the system board. 13. Close the microprocessor retainer and lock it into position with the small handle to secure the new microprocessor in the socket. 14. Reinstall the heat sink and fan assembly. See "Replacing the heat sink and fan assembly" on page 98. 15. Reconnect the heat sink and fan assembly cable to the microprocessor fan connector on the system board. 16. Reinstall any other parts or reconnect any other cables you removed. 102 Hardware Maintenance Manual