IBM DS4800 - Installing the DS4800

b. Using the 5/16 (8 mm) hex nut driver, insert one M5 screw into the hole on
each flange, and tighten the screws completely to secure the front of the
storage subsystem to the cabinet.
3. At the front and the rear of the rack cabinet, use the 5/16 (8 mm) hex nut driver
to finish tightening the other three M5 screws for each rail.
4. Continue with “Replacing the components.”
Replacing the components
Complete this procedure to replace the components in the storage subsystem.
1. Replace the power supply-fans. Figure 21 shows the locations and correct
orientation of the power supply-fans and the power supply-fan levers. The
power supply-fans are keyed to always fit into the enclosure in the proper
orientation. When the component is oriented correctly, a relief along one edge of
each component aligns with a ledge in the enclosure. Before installing the
component, turn the component so that the indicator LEDs are near the center
of the storage subsystem.
2. Replace the interconnect-battery unit. Figure 22 on page 44 shows the location
of the interconnect-battery unit and the interconnect-battery unit levers.
The interconnect-battery unit is keyed to always fit into the enclosure in the
proper orientation. A large pin located on the back of the component prevents
the component from being installed incorrectly. Before installing the component,
turn the component so that the LEDs are near the top of the component.
Power supply-fan
Levers in
released
position
Indicator LEDs
ds48030
Figure 21. Replacing the power supply-fans
Chapter 2. Installing the storage subsystem 43