Lenovo ThinkStation 4353 Hardware Maintenance Manual page 127

Figure 53. Removing the ten screws that secure the system board to the chassis
12. Carefully lift the failing system board out of the chassis.
13. 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 ten screws that secure the system board to the chassis by
following the sequence from
14. Remove the microprocessor socket cover(s) from the new system board.
15. Install the memory modules, PCI cards, battery, microprocessor, heat sink and fan assembly, hard disk
drive enablement module (if applicable), and the hard disk drive fan assembly that you removed from the
failing system board to the new system board.
16. Connect all cables to the system board. See "Locating parts on the system board" on page 76.
17. Go to "Completing the parts replacement" on page 124.
The failing system board must be returned with microprocessor socket covers to protect the pins during
shipping and handling. Install the microprocessor socket covers removed from the new system board
on the failing system board.
Note: The microprocessor socket cover installation procedure should be performed on both microprocessor
sockets on the failing system board.
To install the microprocessor socket cover on the failing system board:
1. Pivot the microprocessor retainer downward to close the retainer.
10 to 1 .
.
Chapter 10 Replacing FRUs
121