Steve,
I would agree with Scott, there is alot of surface area
on the board and it does not appear to be micro-etched/pumice scrubbed prior
to soldermask application. The copper is very shiny. Question:
Is the process selective strip tin-lead or HASL?
Tony Steinke
AIT-Atlanta Inc.
----- Original Message -----
From: "Scott B. Westheimer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, January 13, 2004 4:41 PM
Subject: Re: [TN] "Snake Board"...
> Steve,
>
> Looks like the pre-clean prior to the solder mask application was not
> properly. The copper looks shinny which it should not if the boards have
> been either chemically or mechanically cleaned. Since there is a lot of
> copper that it has to stick to, the cleaning process is critical. The mask
> look like it is fully cured but difficult to determine that from a photo.
>
> My thoughts
>
> Scott Westheimer
> Colonial Circuits
> ----- Original Message -----
> From: "Steve Gregory" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, January 13, 2004 4:01 PM
> Subject: [TN] "Snake Board"...
>
>
> > Hi All!
> >
> > You're probably wondering; "What the heck? Snake board?" That's what I
> call
> > it.
> >
> > Built this assembly (all PTH), waved it, and then washed it, went to get
> it
> > out of our cleaner, and all the solder mask is coming off in big slabs
> just
> > like a snake does when he sheds his skin! Go look at "Mask Peel, Mask
Peel
> 2, &
> > Mask Peel 3" at:
> >
> > http://www.stevezeva.homestead.com
> >
> > I wash in a Electrovert MCS-1000 with Kyzen XJN, and the mask on the
board
> > was a Dupont Vacrel dry film. Never have had a problem with Vacrel dry
> films.
> >
> > The mask doesn't look degraded, or damaged in any way...it's just not
> stuck
> > to the board! Anybody ever seen this happen before? Unfortunately, this
> was a
> > rather expensive assembly.....:^{
> >
> > Nice way to start the year off, huh?
> >
> > -Steve Gregory-
> >
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