17. Lower the microprocessor straight down into the system board socket of the
new system board.
18. Lower the microprocessor retainer.
19. Lock the retainer with the small handle to secure the microprocessor in the
socket.
20. The new retention bracket has plastic one-way rings on the posts that insert
into the rear of the new system board. Install the new retention bracket by
aligning the posts on the module with the holes in the system board and
pushing the posts through the holes until the retention bracket is secure.
21. Install the heat sink and fan assembly on the new system board.
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. Connect all cables to the system board. See “Identifying parts on the system
board” on page 116.
24. Replace the hard disk drive. See “Replacing the hard disk drive” on page 140.
25. Install the drive bay assembly and connect the power and signal cables to the
drives.
26. Reinstall any PCI adapter cards that were removed. See “Replacing a PCI
adapter” on page 121.
27. Position the fan duct on the heat sink fan.

28. Go to “Completing the FRU replacement” on page 144.

128 Lenovo 3000 J Series