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February 2002

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Subject:
From:
tony steinke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 26 Feb 2002 11:20:37 -0800
Content-Type:
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----- Original Message -----
From: tony steinke <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, February 26, 2002 11:19 AM
Subject: Fw: [TN] The board looks funny...


>
> ----- Original Message -----
> From: tony steinke <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, February 26, 2002 11:18 AM
> Subject: Re: [TN] The board looks funny...
>
>
> > Genny,
> > Sounds like your board supplier is using various types of materials and
> > processes if you are recieving boards from the same supplier. As you
> > explained
> > if your inner cores are lighter in color they probably used an oxide
> > replacement
> > or double treat copper which will not give you the "black oxide" or very
> > dark
> > coloration. If your traces on the outside appear darker they may have
> > switched
> > to an adhesion promoter for the soldermask, but usually you would not
see
> > this unless the board has ENIG, white tin, or other aggresive finish
which
> > do in fact
> > attack the mask.
> > Tony Steinke
> > Process Engineer
> > AIT-Atlanta Inc.(multi-wire lives on)
> > [log in to unmask]
> > ----- Original Message -----
> > From: Genny Gibbard <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Tuesday, February 26, 2002 6:59 AM
> > Subject: [TN] The board looks funny...
> >
> >
> > > Hi,
> > > We just received a new rev of a PWB in house.  It has not been
populated
> > > yet.  It looks like it has been built correctly - the right layer
order,
> > > connections, etc - but it looks different than the rest of our 4 layer
> > > boards.  Normally the traces on the inner layer that is closest to the
> > > surface appear dark in colour and the deeper layer appears lighter.
> This
> > > board is the opposite.  The layer closest to the surface is light in
> > colour
> > > and the deeper layer is dark.  Also, the FR4 seems much easier to see
> > > through than usual.
> > >
> > > Any thoughts or explanations for this?
> > > Thanks for your time.
> > >
> > > Genny Gibbard (mailto:[log in to unmask])
> > >
> >
>
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