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September 2003

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 25 Sep 2003 06:06:39 -0700
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text/plain
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text/plain (78 lines)
        Pete:
                It seems that the short was there prior to the CC
application.  CC will not correct a short.  Check boards prior to CC
process.
        Regards,
        Ramon


> :
>
> > Hi Everyone,
> >
> > Having trouble with conformal coating.  Currently using a UV cure
> silicone
> > based spray on a PCB with gold plating.
> >
> > The problem we are experiencing is after the conformal coating is
> applied
> > and curred (0.002" thick), using simple probes with very little pressure
> on
> > the probes, we obtain conductivity between certain traces.  In other
> words,
> > the conformal coating is not preventing electrical conduction between
> points.
> >
> > Specificially, we are having difficulty coating vias and SMT
> > resistor/capacitors.
> >
> > We tried increasing the thickness of the conformal coating sprayed, but
> no luck.
> >
> > Does anyone have any ideas?
> >
> > Thanks,
> >
> > Pete
> >
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