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4. Verify that the LED is lit green on the replaced IOM after properly inserting and seating it in the empty slot.
5. Facing the front of the 5U enclosure, verify that the Power On LED is green and there are no fault conditions.
Replace a 5U fan cooling module
Fan cooling modules (FCMs) provide cooling to the 5U enclosure modules and components. Each fan cooling module (FCM)
has a green and an amber fault LED to identify various states. The asterisk (*) indicates a fault condition.
An important feature of the 5U enclosure design is redundancy. The 5U enclosure will maintain continuous operation during
the replacement of a single FCM, if it is within the time limit of 7 minutes, since removal of an FCM significantly reduces airflow
in the enclosure.
CAUTION If you remove any FRU while the expansion enclosure is powered up, you must replace it with a tested, good
spare within the allotted time for that FRU. If you do not replace the FRU and, when applicable, fully close the related drawer
within the identified time limit, you void the product warranty and the expansion enclosure might overheat, causing
equipment failure and possible data loss.
CAUTION Do not remove covers from any FRU. There is a danger of electric shock inside. Return the FRU to your
supplier for repair.
To replace a fan cooling module:
1. Retrieve the new FCM in its static-protected container, ready to access and use the new FCM immediately upon removal of
the faulty one.
2. Complete the following actions to remove the faulty FCM:
a. Facing the rear of the rack cabinet, press downward to release the FCM latch.
b. Use one hand to support the FCM's weight and the other to gently withdraw the FCM all the way from its slot.
90 Chapter 10 In-service field maintenance for 5U enclosures
LED Type
Color
State
On
FCM OK
Green
Off*
On*
FCM fault Amber
Off
Figure 66 Fan cooling module fault LEDs
Status
FCM hardware functioning properly
FCM hardware fault
Fan speed is out of tolerance
Communication with input/output module (IOM) lost
FCM hardware functioning properly
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