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Updated Defect Information Table
|Affected Product ID
||There were no defects filed with this field notice at the time of publication.|
Cisco has observed that certain identified serial number of WLC 4400 series controllers may fail to boot on a subsequent power cycle.
Few 4400 series controllers that are built between November 2008 and March 2009 have experienced lower test during power cycles due to a bad part. Based on analysis performed by Cisco and the component supplier, we have found that only three percent of the total identified units are built during that period may fail over the life of the product if the product is power cycled frequently. The actual failure rate in the field in the last six months has been less than one percent.
As of April 14th, new products that were manufactured under deviation D102201 or D102319 are free of this problem.
Refer to "How to Identify Affected Products" below for instructions on how to view the deviation number of in-service product.
A small number of controllers that are identified by serial numbers may fail with symptom: "No Power".
- If a unit with a redundant power supply fails, then the system will automatically revert to the backup. Unit will function properly without any problems.
- If a unit with a single power supply fails, then the power supply can be removed from that slot and replaced in the other slot. The unit should boot up and function properly. For instructions on changing the power supply slot, please refer to "Quick Start Guide: Power Supplies for Cisco 4400 Series WLAN Controllers" (Text Part Number: 78-17159-03).
If a customer has a unit with an impacted serial number and they have not experienced a power supply failure, we recommend the customer continue to use the unit. Because the likelihood of a failure is low Cisco recommends a "Fix on Failure" approach. (The UMPIRE Program for the affected units in place is complete, Please follow Standard Cisco RMA process if the user encounter this issue with a suspected unit)
Use the linked Serial Validation Tool to verify if these products are affects:
Note: Products that fall within the affected serial number range are NOT affected by this problem if they have Deviation label D102201 or D102319 applied.
How To Identify Affected Products
Top assembly number (TAN) is the same for all impacted units. Serial number is on the front of the bezel.
Deviations D102201 and D102319 indicate that the product has been reworked and is not impacted by this notice.
For More Information
If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:
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