Lenovo ThinkCentre M57 Hardware Maintenance Manual - Page 134
installing
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a. Take notice of the orientation of the notches 1 on the microprocessor. This is important when installing the microprocessor on the new system board. b. Do not drop anything on the socket while it is open. Keep all contacts as clean as possible. 14. On the new system board, release the lever securing the microprocessor retainer then pivot the retainer until it is fully open. 15. Position the microprocessor so that the notches on the microprocessor are aligned with the tabs in the microprocessor socket. Important To avoid damaging the microprocessor contacts, do not tilt the microprocessor when installing it into the socket. 16. Lower the microprocessor straight down into the system board socket of the new system board. 128 Hardware Maintenance Manual