Lenovo ThinkCentre M55e Hardware Maintenance Manual - Page 109

14. Remove the retention module from the rear of the failing system board and install it in the same position on the new system board. 15. To remove the microprocessor 2 from the system board, lift the small handle 1. 16. Lift the microprocessor straight up and out of the socket. Notes: a. Your microprocessor and socket might look different than the one illustrated. b. Note the orientation of the microprocessor in the socket. Look for the small triangle on one corner of the microprocessor. This is important when reinstalling the microprocessor on the new system board. c. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept as clean as possible. 17. Holding the microprocessor with your fingers, position the microprocessor so that the small triangle 1 is aligned with the corresponding triangle on the socket in the new system board. Chapter 8. Replacing FRUs (desktop computers) 103