15454-FTA2= and 15454-FTA3-T= - Reversed Polarity on Capacitors May Cause Premature Failure of FTA Units

Revised March 10, 2004

December 20, 2002

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Products Affected

Product	Top Assembly		HW Rev.
	Part Number	Rev.
15454-FTA2=	800-07145-04	D0	D0
15454-FTA3-T=	800-21448-02	D0	D0

Problem Description

Due to a defect introduced in the manufacturing process between production weeks 46 and 49, any 15454-FTA2= or 15454-FTA3-T= that was built during this period has a high probability of failure (approximately 30 percent of build). These failures may not happen immediately, but the product will eventually fail. This failure is caused by reverse polarity on the capacitor located at C2 on the Fan Tray Assembly Fan Control Board (FCB).

Background

This issue was introduced in the factory during weeks 46-49 of production at Cisco manufacturing. Week 48 was the week of Thanksgiving and no units were produced. The issue stems from a reversed capacitor at location C2. The defect was detected and corrective action was taken within the manufacturing line to eliminate this issue, starting with week 50 of production. All products built prior to and after weeks 46-49 of production are believed to be free from this defect. There were a number of boards from this production lot that were identified prior to shipment. For a list of serial numbers that are not affected, see the How To Identify Hardware Levels section of this document.

Problem Symptoms

The reversed capacitor eventually causes the fans to intermittently oscillate or stop completely. This should be indicated by a FAN alarm within CTC and a Critical Alarm on the NE itself.

Workaround/Solution

There is no workaround for this defect. As a result of this defect, all affected assemblies eventually fail. If you have products that are listed in this field notice, contact Cisco Technical Support to initiate a return materials authorization (RMA).

How To Identify Hardware Levels

Only production weeks 46 through 49 are affected. Units that do not match the serial number pattern below or are included in the screened materials list are not affected and should not be returned.

Currently, the range of affected serial numbers matches one of the patterns below. The boldfaced text identifies which year and week the product was assembled by the manufacturing team and should be used to screen your inventory to identify units that require replacement.

Affected Serial Numbers

S M A 0 6 4 6 # # # #

S M A 0 6 4 7 # # # #

S M A 0 6 4 9 # # # #

Note: Week 48 was Thanksgiving. The production line was closed.

If you find a serial number that matches one of the patterns above and is of the revision mentioned in the Products Affected section, return this product for immediate replacement. All products that are reworked as a result of this recall will have a revision that is different than what is listed in this field notice.

For example:

• 15454-FTA2= 80007145-04 D0 will become 800-07145-04 E0

• 15454-FTA3-T= 800-21448-02 D0 will become 800-21448-02 E0

The Version and Revision information is viewable with use of the Inventory Screen within CTC.

These serial numbers have been screened and are not affected by this issue:

SMA06463007, SMA06463009, SMA06473001, SMA06473002, SMA06473003, SMA06473006, SMA06473008, SMA06473009, SMA06473010, SMA06473012, SMA06473013, SMA06473014, SMA06473016, SMA06473017, SMA06473018, SMA06473019, SMA06473020, SMA06473021, SMA06473022, SMA06473023, SMA06473026, SMA06473027, SMA06473028, SMA06473030, SMA06473031, SMA06473032, SMA06473034, SMA06473035, SMA06473036, SMA06473037, SMA06473042, SMA06473043, SMA06473044, SMA06473045, SMA06473046, SMA06476109, SMA06476115, SMA06476134, SMA06476138, SMA06476149, SMA06476151, SMA06476154, SMA06476161, SMA06476169, SMA06476171, SMA06476174, SMA06476175, SMA06476182, SMA06476185, SMA06476208, SMA06476215, SMA06476218, SMA06476251, SMA06476267, SMA06476268, SMA06476273, SMA06493001, SMA06493003, SMA06493004, SMA06493005, SMA06493006, SMA06493007, SMA06493008, SMA06493009, SMA06493010, SMA06493011, SMA06493012, SMA06493017, SMA06493018, SMA06493019, SMA06493020, SMA06493022, SMA06496006, SMA06496009, SMA06496010, SMA06496011, SMA06496016, SMA06496017

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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