Silicon Graphics 1450, Maintenance Manual

Page: 55 / 162

Cooling System
007-4276-001 39
Removing the Fan Board Assembly
To remove the fan board assembly, follow these steps:
1. Observe the safety and ESD precautions at the beginning of this chapter.
2. Turn off the system by pressing the power on/off button on the front panel, and
unplug all AC power cords.
3. Remove the front cover. See “Removing the Front Cover” on page 23.
4. Remove the top cover. See “Removing the Top Cover” on page 25.
5. Remove all individual fans from the assembly. See “Removing and Installing
Individual Fans” on page 42.
6. Remove the two screws that secure the board assembly to the chassis. Set the screws
aside. You will need them later in this procedure. One of the screws is noted by “A”
in Figure 2-7.
Figure 2-7
Fan Board Assembly Screw
7. Lift the fan board assembly directly upward and rest it on the E-Bay assembly.
8. Disconnect the cables from the assembly. There are three cables, as follows:
A