I agree, CYS that type of defect should not occur with a shop whose
processes are in control.


James Hofer
Director of Operations
Accurate Circuit Engineering
3019 S. Kilson Dr.
Santa Ana Ca. 92707-4202
714-546-2162 work
714-473-6127 cell
[log in to unmask]
----- Original Message -----
From: "Brian Ellis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 02, 2004 10:45 PM
Subject: Re: [TN] Contamination on the fabs....


> The quick answer is CYS (change your supplier).
>
> I don't go with the "erupting via" theory because the second photo shows
> the "contamination" well away from any via. The appearance of the
> soldermask is execrable, in any case. I suspect that the mask material
> may be to blame, with incomplete cross-linking.
>
> A chemical analysis is needed before any conclusions can be drawn. In
> the meanwhile, return the goods to your supplier for replacement,
> because it may be doubtful whether they are usable. Then CYS.
>
> Brian
>
> Ken Patel wrote:
> > Fab & Assembly Experts,
> >
> > I am seeing some kind of contamination to bare boards. I have put
pictures
> > at Steve web site for everyone's review and here is the link.
> >
> >
> >
> > http://www.stevezeva.homestead.com <http://www.stevezeva.homestead.com/>
> >
> >
> >
> > Does anyone have seen similar kind of contamination? Is it some kind of
> > corrosion? It looks outside of board to me but not sure as I have seen
the
> > boards personally yet. Boards are processed Electroless Nickel Immersion
> > Gold.
> >
> >
> >
> > Any help will be highly appreciated.
> >
> >
> >
> > Re,
> >
> > Ken Patel
> >
> >
> >
> >
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