Before you begin
This task assumes that the following conditions were met:
v All power cables were removed from the enclosure, as described in “Powering
off the expansion enclosure: 2077-92F” on page 135.
v The top cover, fan modules, and the other heavy FRUs (drives, secondary
expander modules) were removed before the enclosure was removed from the
rack.
v The expansion enclosure was removed from the rack, as described in “Removing
an expansion enclosure from a rack: 2077-92F” on page 95.
Ensure that you use a lift to support the weight of the enclosure.
About this task
The 2077-92F expansion enclosure contains two fan interface boards (FIBs). The
FIBs act as the interface between the fans and the system drive board. FIB 1
connects fan modules 1 and 2 to the drive board; FIB 2 connects fan modules 3
and 4. If both fan modules controlled by a FIB fail, it is possible that the FIB needs
to be replaced.
Important: Because this task is disruptive to the storage system, always attempt
fan replacement first. See “Removing a fan module: 2077-92F” on page 115 and
“Installing or replacing a fan module: 2077-92F” on page 91 for information about
the removal and replacement procedures. Ensure that both fans are installed
correctly. Perform the following procedure only if the amber fault LED on each fan
remains lit (▌1▐ in Figure 101).
Procedure
1. Using a cross head screwdriver, remove the narrow metal cover that is over the
FIBs, as shown in Figure 102 on page 118. The screws are on each side of the
chassis. Place the cover and cover screws in a safe location.
Figure 101. Fan module LED
Chapter 2. Installing the system hardware 117
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