NEC Express 5800/120Lg, Service Manual

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Disassembly and Reassembly 4-59
11. Tag and remove any PCI option boards installed on the system board. See
PCI Boards earlier in this chapter. Save the PCI option boards for
reassembly.
Note:
The PCI option boards must be reinstalled in the
same slots when you reassemble the system.
12. Tag and disconnect all the power, signal, and fan cable connectors from their
mating connectors on the system board.
13. Remove the eight screws securing the system board to the chassis.
See Figure 4-55, A. Save the screws for reassembly.
14.
Carefully move the board sideways slightly towards the front of the cabinet
so that it clears all its I/O connectors. Then lift the system board out of the
chassis and place it component-side up on a nonconductive, static free
surface.
15.
Remove the four screws securing each CPU retention module and remove
the module for use on the replacement system board. See Figure 4-55, B.
Note that the CPU retention module reinforcement brackets are located on
the back of the system board and will become loose once the screws are
removed.
A
B
C
A
System board mounting
screws (8)
B
CPU retention module
mounting screws (4)
C System Board
Figure 4-55. Removing the System Board and Retention Modules