Lenovo ThinkStation C20x 4269 Hardware Manual page 117

10. Remove the microprocessor socket cover from the new system board.
11. Remove the microprocessor from the failing system board and install it on the
new system board. See "Replacing the microprocessor" on page 107.
12. The failing system board must be returned with a microprocessor socket cover
to protect the pins during shipping and handling. Install the microprocessor
socket cover removed from the new system board on the failing system board.
To install the microprocessor socket cover:
a. Make sure the microprocessor has been removed from the microprocessor
socket, and then close the microprocessor retainer and lock it into position
with the small handle.
b. Insert the tabs 1 of the socket cover into the hinged side of the socket,
and then press the other side of the socket cover downward until the tabs
2 snap into position.
13. 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
following the sequence shown in the figure above.
14. Install the memory modules in the same location on the new system board.
15. Install the microprocessor on the new system board. See "Replacing the
microprocessor" on page 107
16. Install the heat sink and fan assembly on the new system board. See
"Replacing the heat sink" on page 105.
17. Connect the heat sink and fan assembly cable to the new system board. See
"System board connectors and components" on page 93.
18. Install the hard disk drive fan. See "Replacing a fan assembly" on page 119.
19. Connect all cables to the system board. See the system board illustration for
your machine type at "System board connectors and components" on page 93.
20. Go to "Completing the FRU replacement" on page 123.
Chapter 9. Replacing FRUs (types 6423 and 6483)
111