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September 2009

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Subject:
From:
Dan Skweres <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dan Skweres <[log in to unmask]>
Date:
Wed, 9 Sep 2009 10:52:14 -0400
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Jim,
I believe what they're attempting to convey is there is a micro etch before
the OSP process to clean the copper. They have to test prior to OSP so that
is the reasoning they're giving for not catching the open(s). It looks like
there's barely any copper in the holes. What requirement were they building
and inspecting to? Unless they left the panels in a micro etch and forgot
about them there's no way a proper pre-clean using micro etch would remove
that much copper. Send 'em back!!!
Dan S.
----- Original Message ----- 
From: "J W" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 09, 2009 10:41 AM
Subject: [TN] PTH problem


Hi TechNet group,

I'm really getting nervous about a China bare board supplier and their
quality and need your opinions.  Please take a look at the picture by
clicking on the link below showing two plated through holes (via's).  The
problem reported originally was a bad ground connection between ground via's
and ground planes.  As you can see, the pictures are very telling, and you
can clearly see the ground plane not connected (several planes not connected
actually).  What I'm also nervous about is the comment listed below the
pictures "The plated copper on PTH surface will be etched thin after OSP
process".  Is that statement correct?  I'm not a bare board expert by any
means, but I believe a PTH should have a little more copper than what is
shown?  I know that OSP is not something new, so are other board suppliers
dealing with the same issue of possible thin PTH walls because of OSP?

I also submitted pictures early last week regarding the same supplier having
problems with the their solder mask process, so to me, I'm thinking this
board shop is not up to standards and we should inform out board assembler
house to look for another supplier...immediately?

Thanks for your help!

Jim

http://stevezeva.homestead.com/PTH_Connection_issue.jpg

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