IBM J15 Manual page 93

• All power cables were removed from the enclosure, as described in "Powering off the 5U92 disk
enclosure" on page 44.
• The expansion enclosure is removed from the rack, as described in "Removing a 5U92 disk enclosure
from a rack" on page 69.
• A lift is supporting the weight of the enclosure.
• The top cover, fans, drives, and other heavy FRUs are removed from the enclosure.
About this task
The 5U 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 the fault LED on each fan module is lit, it is possible that the FIB that
controls those modules needs to be replaced. You can also issue the lsenclosurefanmodule
command to display the status of the fans.
If you removed the FIBs from a faulty expansion enclosure, you must reinstall them in the replacement
enclosure. Refer to the procedure described in "Replacing a disk enclosure " on page 51.
Procedure
1. Assemble the new FIB, cover, and the cover screws (shown in Figure 65 on page 65) in a safe
location.
Figure 65. FIB parts for the chassis
2. Carefully insert the new FIB into the expansion enclosure chassis, as shown in Figure 66 on page
66.
Chapter 3. Maintaining the system hardware 65