Lenovo ThinkCentre A57, Hardware Maintenance Manual

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15. On the new system board, release the lever securing the microprocessor retainer and then pivot the
retainer until it is fully open.
Note: There will be a black plastic cover on the microprocessor retainer to protect the socket on the
new system board. Remove the black plastic cover and place it on the microprocessor socket of the
failing system board.
16. Holding the microprocessor with your fingers, 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.
17. Lower the microprocessor straight down into the system board socket of the new system board.
18. To secure the microprocessor in the socket, close the microprocessor retainer and lock it into position
with the small handle.
19. Install the new retention module (if required) on the new system board.
20. Install the heat sink and fan assembly on the system board.
21. Connect the heat sink and fan assembly cable to the new system board. See the system board illustration
for your machine type at “System board connectors” on page 92.
22. Install the new system board into the chassis and align the screw holes with those in the chassis. Insert
and tighten the screws that secure the system board.
23. Pivot the hard disk drive back into position.
24. Connect the power and signal cables to the hard disk drive.
25. Connect all cables to the system board. See the system board illustration for your machine type at
“System board connectors” on page 92.
26. Go to “Completing the FRU replacement” on page 117.
Chapter 9
.
Replacing FRUs (Types 7064, 7094, 9349, 9356, 9357, 9439, 9488, 9702, 9708, 9709, 9789, 9851, 9948)
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