Removing The Baseboard - NEC Express 5800/140Rb-4 Service Manual

Removing the Baseboard

To remove the baseboard:
1. Make backup copies of the current NvRAM information before replacing the mother board, and
restore the information onto the new mother board after the replacement. If the system is unable
to make backup copies, set the NvRAM information.
2. Remove all external cables from the baseboard I/O ports at the back of the chassis.
3. Remove the fan assembly (page 82).
4. Label and disconnect all internal cables connected to the PCI add-in boards.
5. Remove all PCI add-in boards (pages 67and 69).
6. Plastic curtains run the length of the electronics bay separating the PCI add-in cards. Remove
the curtains as follows:
a. Release one end of the curtain from the front retention mechanism. Lift the free end high
enough to clear the chassis.
b. From outside of the rear of the chassis, push down on the other end of the curtain and pull
the free end out of the chassis.
7. Label and remove all internal cables attached to connectors on the board. For a diagram showing
labeled connectors, see Figure 61 on page 108. Remove all cables from the cable retention clip
on the front of the electronics bay.
8. A plastic retention mechanism for the PCI add-in cards is fastened to the front of the electronics
bay by three clips (Figure 15, A). Release each clip by pressing down on the tab and remove the
retention mechanism.
A
B
Installing and Removing Components
Tabs (3) on retention mechanism
Protective overlay
Figure 15. Removing the Front Retention Mechanism
C Overlay tab (1 of 2)
D Overlay screw
41