Field Notice: FN - 63110 - 15454-MR-L1-xx.x, 15454-MRP-L1-xx.x , Bad Lot of Boards, Recall Due to a MOSFET Reliability Issue in a DC to DC Circuit on the Cards - Replace on Failure

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Products Affected

Defect Information

Problem Description

A lot of MOSFETs provided by a specific supplier are marginal in design. These MOSFETs are part of the 2.5V power supply. The power supply is a push/pull design, where two devices are designed to alternate on and off, such that both are not driving at the same time. The problem MOSFETs have a very high turn off delay, resulting in simultaneous driving. If this occurs, one part can heat up, causing it to fail over time.

Note: The replacement program associated with this field notice will be expiring as of 10/28/2010. Those customers wishing to participate in this program must do so by this expiration date.

Background

The defective MOSFET is due to a bad lot from a single vendor. Assemblies that contain a MOSFET that is potentially subject to this failure mode are identified by Serial Number.

Problem Symptom

The card starts generating OTUk alarms, it will begin to autoreset, and eventually permanently fail.

Workaround/Solution

Cisco recommends replacing hardware potentially impacted by this issue to avoid a field failure. Customers should use the standard RMA process to replace affected HW after 10/28/2010. The impacted Serial Numbers are listed in the Field Notice validation link below.

As of approximately 5-22-08 new products that were manufactured under Engineering Change Order(ECO)#E091403 are guaranteed to be free of this problem.

Refer to the "How to Identify Affected Products" section for instructions on how to view the serial numbers of in-service product.

How To Identify Affected Products

All parts potentially impacted by this issue are listed by part number and serial number in this field notice.

To determine the serial number of your ONS 15454-MR-L1-xx.x, or 15454-MRP-L1-xx.x:

Open Cisco Transport Controller.

From the Shelf View, select Inventory.

From the Inventory tab, locate the MR-L1-xx.x, or MRP-L1-xx.x cards and compare the information from the Inventory tab against the serial number validation tool.

If you are using TL1 commands.

1. >ACT-USER::

2. >RTRV-INV::ALL

3. >CANC-USER::

Compare the information from the TL1 inventory command against the serial number validation tool.

Please use the link below to validate your serial number(s).

Cisco Serial Number Validation Tool

Note: The replacement program associated with this field notice will be expiring as of 10/28/2010. Those customers wishing to participate in this program must do so by this expiration date.

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:

• Open a service request on Cisco.com
• By email
• By telephone

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