I agree with Victor on the solder-on-Au-connector issue...
Looks to me that someone either reworked or touched-up the connectors after SMT or they hand soldered the connectors in...
Adding flux to the connector and touching the SJs to clear a solder short or (most likely) to add solder to the joint will cause solder to wet up into the contact area on low profile connectors...Extra heat starts it but too much solder and flux does it every time...
You'll have to ask the CM to remove and replace the connectors...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Wednesday, October 07, 2009 10:06 AM
To: [log in to unmask]
Subject: Re: [TN] gold connector discoloration
Beware of fretting with the solder on the gold plated contacts.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Wednesday, October 07, 2009 9:34 AM
To: [log in to unmask]
Subject: Re: [TN] gold connector discoloration
Justin,
It looks like you have some solder that has made its way up the gold.
The picture of the prior board looked as if there was less solder used
to attach the connector, as there is still evidence of gold on the leads
(where solder has not covered the leads as it has done in the 'new
batch' image).
Maybe they installed connectors that had been tinned, so there was
additional solder in the process.
Ben
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Justin Braime
Sent: Wednesday, October 07, 2009 10:12 AM
To: [log in to unmask]
Subject: [TN] gold connector discoloration
Hi Technetters,
We've just received a new batch of boards from one of our
subcontractors,
and the Hirose DF12 header sockets have discoloration on the mating
terminals.
On previous batches, we have seen a little discoloration adjacent to the
solder joints, but never up in the connector mating area itself. The
process
hasn't (allegedly) changed.
I've posted some pics at:
http://gallery.me.com/jbraime/100005
Any ideas as to the cause? Any detriment to functionality?
Thanks in advance,
Justin
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