March 01, 2004
This issue potentially affects all Catalyst 6000 linecards that use a Immersion Silver Printed Circuit Board (PCB) surface finish.
Some Catalyst 6000 Immersion Silver Printed Circuit Board (PCB) surface finish, which is not covered by solder, may become discolored over time. This discoloration is purely cosmetic in nature, and has NO impact on product performance or product functionality.
Immersion Silver is one of several surface finishes commonly used on PCB's in both the electronic and automotive industries. Discoloration of Catalyst 6000 Immersion Silver surfaced PCBs commonly occurs for these reasons:
If Immersion Silver surfaced PCB's come into contact with finger oil residue from bare hands.
If Immersion Silver surfaced PCB's are exposed to excessive levels of humidity.
Dark smudges and areas of discoloration appear on the silver surfaces of a Catalyst 6000 PCB. The edge rails of a PCB are the most common locations for discoloration to occur.
Customers are encouraged not to handle Immersion Silver PCBs by the edge rails. No other workaround is required.
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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