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Replacing a failed fan and communications module
When instructed by the storage-management or diagnostic software, replace a fan and
communications unit.
Attention: To prevent damage to the controller unit circuitry, do not operate the
controller unit without adequate ventilation to the controllers. If it will take
longer than 15 minutes to replace the controller fan, you must shut down the
controller unit to prevent it from overheating. The time limit applies only to
the total time that the fan is out of the chassis. The time begins when you
remove the failed module and ends when you install the new one. This does
not include the time it takes you to perform this entire procedure (for
example, checking the lights).
When you handle electrostatic discharge (ESD) sensitive devices, take
precautions to avoid damage from static electricity. For details about
handling ESD-sensitive devices, refer to the following Web site and use a
search term of ESD: http://www.ibm.com/
1 Unpack the new fan and communications module.
2 If you are using a diagnostic program, stop the program before disconnecting the
cables.
3 Disconnect all RS-232 and Ethernet interface cables from the failed fan and
communications module. The locations of the ports are shown in the following figure.
RS-232 cable ports
Controller A
Controller B
Figure 24. Fan and communications module ports and indicator light
Ethernet cable ports
Controller B
Controller A
Chapter 3. Replacing controller unit components
Fan and
communications
indicator light
43
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