Lenovo ThinkCentre 3512 Manual page 111

Figure 40. Removing the seven screws that secure the system board to the main bracket
13. Place the new system board into the chassis and align the screw holes with those in the chassis.
14. Reinstall the seven screws that secure the system board to the main bracket.
15. Reinstall the rear I/O assembly. See "Replacing the rear I/O assembly" on page 86.
16. Reinstall the battery. See "Replacing the battery" on page 98.
17. Reinstall the memory modules. See "Installing or replacing a memory module" on page 100.
18. Reinstall the microprocessor. See "Replacing the microprocessor" on page 93.
19. Reinstall the heat sink assembly. See "Replacing the heat sink assembly" on page 91.
20. Reinstall the system board shield. See "Removing and reinstalling the system board shield" on page 88.
21. Reconnect all cables that were disconnected from the system board. See "System board parts and
connectors" on page 72.
22. Go to "Completing the parts replacement" on page 111.
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, do the following:
1. Release the lever securing the microprocessor retainer and open the retainer to access the
microprocessor.
2. Grasp the microprocessor on the sides and lift it straight up and out of the socket. Do not touch the
contacts on the microprocessor socket.
3. Note the orientation of the socket cover. Align the notches
with the alignment keys
the microprocessor socket.
2
on the microprocessor socket. Install one side of the socket cover into
1 on the microprocessor socket cover
.
Chapter 9
105
Replacing FRUs