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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 11:20:26 -0800
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----- 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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