Lenovo ThinkStation 4215 Hardware Maintenance Manual page 111

Figure 23. Removing the system board
11. Carefully lift the failing system board out of the chassis.
12. Position the new system board into the chassis so that the screw holes in the
new system board are aligned with those in the chassis. Install the screws that
secure the system board following the sequence shown in Figure 23.
13. Remove the microprocessor socket cover from the new system board.
14. Install the memory modules, PCI cards, battery, microprocessor, and heat sink
and fan assembly that you removed from the failing system board to the new
system board.
15. Reinstall the secondary hard disk drive. See "Replacing the secondary hard
disk drive" on page 109.
16. Connect all cables to the system board. See "Locating parts on the system
board" on page 86.
17. Go to "Completing the FRU replacement" on page 122.
The failing system board must be returned with a microprocessor socket cover to
protect the pins during shipping and handling.
To install the microprocessor socket cover:
1. Remove the microprocessor from the microprocessor socket. See "Replacing the
microprocessor" on page 101.
2. Align the notches 1 on the microprocessor socket cover with the alignment
keys 2 in the microprocessor socket.
3. Install one side of the socket cover into the microprocessor socket as shown.
Chapter 9. Replacing FRUs
105