Electronics Forum | Thu Apr 13 21:02:37 EDT 2000 | Mario Carluccio
Can anyone advise me what are the types of contaminants which can be present on a printed circuit board at the very beginning of a SMT line. Of these contaminants, are any of them detrimental to the SMT process (i.e. label application, or solder pas
Electronics Forum | Sat Jul 08 00:06:16 EDT 2000 | Edmund
Can any pls enlighten me what is the purpose of using DI water during washing of PCBA. If the board is not wash using DI water , what will happe? What is the range of resitivity reading should be. Rdgs...
Electronics Forum | Thu Aug 30 06:57:56 EDT 2007 | simonalden
Hi we are currently experiencing a problem with solder contamination of the gold contact pads on our pcbs following the reflow process, possibly through sputtering. We have been advise that this can be caused due to the pcbs being humid or due to th
Electronics Forum | Fri Apr 14 11:00:38 EDT 2000 | Dave F
Mario: Your ask a very broad question and give no background information. Generally, the amount and type of residues present on a printed circuit board at the very beginning of a SMT line depends on the exposure of the board up to that point. For
Electronics Forum | Wed Jan 12 13:42:19 EST 2011 | dwonch
Hi All, I'm hoping there is a PCB expert or two hanging around. We're having some solderability issue on our boards. The finish is ENIG but it doesn't seem to be related to the finish process itself. We did SEM and EDX analysis and found aluminum an
Electronics Forum | Mon Aug 09 11:34:25 EDT 2004 | Woodsmt
I am looking for data / info on how flux may contaminate the solder in a Wave. I have a customer who requires a no clean process. Our wave is equipped with 2 separate fluxing systems and I would like to use OA in one and the No Clean in the other. Th
Electronics Forum | Mon Nov 11 20:11:07 EST 2013 | davef
Matt: What's the solderability protection on the boards? * Specification? * Actual? Are the boards fabricated by the same supplier?
Electronics Forum | Fri Nov 08 17:49:05 EST 2013 | davef
First, it's a surprise that your failure analysis lab thought everything was OK with these boards. They look like shit. Second, a few years ago, there was a bunch of complaints about ENIG boards with issues similar to what you're observing. There wa
Electronics Forum | Wed Nov 13 18:00:59 EST 2013 | davef
It's too bad that SMTnet won't let us view your pdf. I asked the geeks to fix that. If someone really want to read it Matt can likely get it off to you. Is it OK to do that, Matt? Anyhow, the Trace Labs report seems to be focused on some SMT pad dis
Electronics Forum | Mon Nov 11 08:47:00 EST 2013 | mleber
Thanks guys. Here are more details. The cards are essentially the same. They use the same connectors, same footprint, the traces / layers would be comparable etc. The difference between the 2 we see is that one is laminate - Rigid Metal Clad Base, Ty
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