Looks like the mask is very thin over the traces. Hope you don't get
failures there.
Some of the circles look like the inner layer clearances, others look like
contaminants.
I think you need a X-section.
Chuck Brummer
3M Manufacturing Engineer
8357 Canoga Ave.
Canoga Park, CA 91304-2605
(818) 734-4930
Paul Reid <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/19/2009 02:12 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Paul Reid <[log in to unmask]>
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Subject
Re: [TN] PCB problems
Hi Ioan,
I think the Halo looks like a contaminant and could be a problem. It
might be thick mask but my vote says contaminant under the mask.
Why not probe the mask and see if the discolorations is on the surface of
the PWB or not.
Best regards,
Paul
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Friday, June 19, 2009 3:49 PM
To: [log in to unmask]
Subject: [TN] PCB problems
Dear Technos,
I have a few questions regarding a funny lot of PCBs we've received. Steve
was kind enough to post the pictures, see
http://stevezeva.homestead.com/files/non_uniform_hasl.jpg <
http://stevezeva.homestead.com/files/non_uniform_hasl.jpg>
http://stevezeva.homestead.com/files/non_uniform_hasl_1.jpg <
http://stevezeva.homestead.com/files/non_uniform_hasl_1.jpg>
http://stevezeva.homestead.com/files/via_halo.jpg <
http://stevezeva.homestead.com/files/via_halo.jpg>
http://stevezeva.homestead.com/files/via_halo_detail.jpg <
http://stevezeva.homestead.com/files/via_halo_detail.jpg>
Out of the pack of 15 that I have inspected, most of them have some weird
halos around all the vias, but no such issue around the component mounting
holes. The pictures show the worst board, the rest have it to a lesser
extent. What is it? Should this be a reject? Is this anything we should
admonish our fab about?
Secondly, the SnPb HASL, is irregular on the pads, which is not out of the
ordinary, but on some boards looks like in the pictures. I hesitate
calling this de-wetting, since the wetting angles are good. Is it
de-wetting? Should we reject the boards? I will paste the worst board I
find and reflow it, to get an idea what happens during soldering, but I
should also be able to help the incoming inspectors draw a line between
good and bad in visual inspection of future lots...
Thank you,
Ioan Tempea, ing.
Ingénieur Principal Fabrication / Sr. Manufacturing Engineer
30 ans déjà! - Already 30 years!
950 rue Bergar, Laval, Québec, H7L 5A1
t : 450-967-7100 ext : 244
Mtl : 514-990-5762
f : 450-967-7444
[log in to unmask] <mailto:[log in to unmask]>
www.digico.cc <http://www.digico.cc/>
P N'imprimer que si nécessaire - Print only if you must
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