Lenovo ThinkCentre M55e Hardware Maintenance Manual - Page 113
To secure the microprocessor in the socket, close the microprocessor retainer
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b. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept as clean as possible. 8. Make sure that the microprocessor retainer is fully open. 9. Holding the microprocessor with your fingers, remove the protective cover 2 that protects the gold contacts on the new microprocessor 1 . 10. Holding the microprocessor with your fingers, align the notches on the microprocessor with the tabs in the microprocessor socket 11. Lower the microprocessor straight down into the socket. 12. To secure the microprocessor in the socket, close the microprocessor retainer and lock it into position with the small handle. 13. Use the thermal grease syringe to place five drops of grease on the top of the microprocessor. Each drop of grease should be 0.03ml (3 tick marks on the grease syringe). Chapter 8. Replacing FRUs (desktop computers) 107