Lenovo ThinkCentre A61 Hardware Maintenance Manual page 101

15. Holding the microprocessor with your fingers, position the microprocessor so
that the small triangle 1 on one corner is aligned with the corresponding
triangle on the socket on the new system board.
16. Make sure that the small handle is in the raised position.
17. Lower the microprocessor straight down into the system board socket of the
new system board.
18. Lower the small handle to secure the microprocessor in the socket.
19. Position the heat sink on the microprocessor socket and then position the
clamp on the plastic retention bracket. Pivot the handle to clamp the heat sink
to the plastic retention bracket.
20. Connect the heat sink and fan assembly cable to the system board. See
"Locating parts on the system board" on page 89.
21. 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.
22. Pivot the hard disk drive back into position.
23. Connect the power and signal cables to the hard disk drive.
24. Connect all remaining cables to the system board. See "Locating parts on the
system board" on page 89.
25. Go to "Completing the FRU replacement" on page 114.
Chapter 8. Replacing FRUs - Tower Computers
95