[c-nsp] heat fins popping loose on WS-X67xx cards

[Eric Cables]

We experienced the same problem on a number of 6748 blades, and requested
failure analysis from Cisco (report below).

We were performing a chassis swap, and the heatsink/fin/whatever literally
fell off upon card removal, which led to the discovery of the faulty bracket
on multiple cards -- but not all cards.

Here's the failure analysis report:

*FA case Number: FA-0063752

Fault Isolated

The customer reported that the line cards had faulty Heatsink latches.  The
customer's symptom was duplicated.  The line cards failed visual inspection.

The line card with serial number <<REMOVED>> had a Z1 latch became detached.

The Z1 came off and caused the heatsink to become loose. No damage was done
to the baseboard.  The line card with serial number <<REMOVED>> had both Z1
and Z2 missing.  The latches were not on the card, which caused the Heatsink
to move around. Only some minor scratches were observed on the baseboard.

This case was closed as fault isolated due to the detached latches on the
boards. MM/CG*


-- Eric Cables


On Thu, May 28, 2009 at 9:19 AM, Jay Ford <jay-ford at uiowa.edu> wrote:

> In the past 9 days I've found that 3 of our Catalyst 6500 WS-X67xx cards (2
> WS-X6748-GE-TX & 1 WS-X6748-SFP) had dislodged heat fins.  The fins are
> supposed to be tethered by a spring hooked into a small wire loop which
> seems
> to be soldered onto the circuit board.  In the case at hand the wire loop
> pulls out of the board & the heat fin then flops around free & in 1 case
> the
> wire loop was rattling around on the card.  Not good.
>
> I'm trying to determine if this is a systemic problem or just a fluke.  It
> seems like a design flaw, with the spring being too much for the soldered
> wire loop.  Has anybody else seen this?  If so, with how many cards & of
> what
> types?
>
> ________________________________________________________________________
> Jay Ford, Network Engineering Group, Information Technology Services
> University of Iowa, Iowa City, IA 52242
> email: jay-ford at uiowa.edu, phone: 319-335-5555, fax: 319-335-2951
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