Lenovo 3057 Maintenance Manual page 197

19. Install the ten screws following the recommended numerical sequence as shown to secure the new
system board on the chassis.
Figure 145. Installing the screws to secure the system board
20. Remove the microprocessors from the old system board and install them on the new system board. See
"Installing or replacing the microprocessor" on page 137.
21. The old system board must be returned with two microprocessor socket covers to protect the pins on
the microprocessor sockets during shipping and handling. Use the microprocessor socket covers
removed from the new system board.
To install a microprocessor socket cover on the old system board, do the following:
a. Ensure that the small handle and the microprocessor retainer are in the fully open position. See
"Installing the second microprocessor" on page 137.
Note: Do not drop anything onto the microprocessor socket while it is exposed. The socket pins
must be kept as clean as possible.
.
Chapter 6 Installing, removing, or replacing hardware
183