Remove the particles, not to risk leakage current between pins.
If the insulator is silicon rubber then it's not likely that it's decomposit
result.
Futhermore, silicon rubber use to be repellant to many debris.
Are the connectors directly from stock or have they been used? Washed?
A EDAX run can decide, or a FTIR ditto.
I inspected connectors from the Iraq war zones and the whole inside was
full of desert dust. Your connector seems to be the same, not only the
(silicon rubber?) water protection gasket.
The micron-sized dust is nearly impossible to stop, creeps in everywhere.
Costs US mil millions every month.
I was responsible connector specialist for Ericsson once, and I never saw
something like, except for military parts from the field.
Inge
----- Original Message -----
From: "Steve Gregory" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 16, 2010 2:18 PM
Subject: Re: [TN] Any concern for this connector?
> Good Day Wee Mei,
>
>
>
> I have your pictures posted. They are here:
>
>
>
> http://stevezeva.homestead.com/Connector_1.jpg
>
>
>
> http://stevezeva.homestead.com/Connector_2.jpg
>
>
>
> The little black particles remind of something I saw on some assembled
> boards one time. It came from the black conductive foam that was old and
> breaking down that lined the bottom of the trays we were using to
> transport
> the boards.
>
>
>
> I'm not really sure about the little defect in the end of the pin, it
> looks
> like something that was there when it was made. It will probably be okay,
> but why not just replace the pin? But then again that might be easier said
> than done. I don't know what kind of cable you have.
>
>
>
> Steve
>
>
>
> From: Lum Wee Mei [mailto:[log in to unmask]]
> Sent: Monday, November 15, 2010 9:29 PM
> To: [log in to unmask]
> Subject: Any concern for this connector?
>
>
>
> Steve,
>
>
>
> Can you post the two pictures for me and forward them with my message to
> our
> dear TechNet
>
>
>
> During a visual inspection, I noticed the following :
>
> 1. There are tiny black spots on the base insulator which cannot be
> removed using blower. However, they can be removed by slowly wiping them
> with bits of lint wipe. Guess the smooth padding of the insulator caused
> the
> soot (can I called them) to stick on it.
> 2. One of the pin was found to have a "defect" mark nearing its tip.
>
> As I was not involved in the initial inspection when the harness is made,
> I
> did not know whether these two observations are already present initially.
> No one can recall the initial status. The connector has been used for 4
> testing with no failure observed. My questions are :
>
> 1. What is the likely cause of those tiny "soot" if they are not
> present initially?
> 2. What is the likely cause of the "defect" on that pin if it was not
> initially there?
> 3. If I continue to use this connector, will the "defect" on that pin
> cause any potential failure? The condition this connector is going to be
> used will be voltage of 60V and current about 8.5Amp.
>
> Thanks & Regards,
>
> ~ Wee Mei ~
>
>
>
> "Each of us has a mission that only we can fulfil. That mission will not
> be
> found somewhere far away, in doing something special or extraordinary.
> Even
> those people who seem to have led great lives have really only done what
> they felt they had to do in order to truly be themselves. We realise our
> purpose in life by doing our very best where we are right at this moment,
> by
> thinking about what we can do to improve the lives of those right around
> us." - SGI President Daisaku Ikeda
>
>
>
>
>
>
>
>
>
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