Electronics Forum | Wed Jun 11 10:23:07 EDT 2008 | charliedci
Hi, > > we have to print a serial barcode on a low > volume PCB. For another module we just used our > laser printer and cut the labels to > size. > > However, those laser labels are easy to > rub off, and the new labels are much > smaller. >
Electronics Forum | Fri Oct 23 15:43:31 EDT 2009 | seankim10
According to 5.2.6.1, it states that defected if Solder balls are not entrapped in no-clean residue or conformal coating. How do you define entrapment or how do you assess if the balls won't dislodge under normal product service environment? The sold
Electronics Forum | Tue Apr 14 17:39:34 EDT 2009 | gregoryyork
Sorry been away for a while. It is actually due to high boiling solvents or plasticizers leaching from the porous resist that kills the cure as it puddles out and has nothing to adhere to. We do have some wipes to check the cure and are looking to ma
Electronics Forum | Fri Nov 06 11:39:17 EST 2009 | 14367
As you know, the H1N1 virus is on the move, and we are trying to take precautions. We wish to use a 60% alcohol based lotion for disinfecting our hands. It has been questioned if the added substances could be detrimental to electronic assembly board
Electronics Forum | Sun Nov 22 09:36:17 EST 2009 | patrickbruneel
Dave, A low residue/No residue flux does exist that when an excessive amount of flux is applied it would only create a cosmetic problem not a reliability issue. The active ingredients are neutralized by the heat applied in the soldering machine and
Electronics Forum | Fri Feb 05 20:39:41 EST 2010 | localperm79
I've recently been placed in control of operations of our SCS conformal coat sprayer and I must eliminate problems with wicking of humiseal 1b73 into surface mount connectors while also trying to minimize masking as much as possible. We use a 55:45
Electronics Forum | Tue May 25 12:17:44 EDT 2010 | markhoch
Dang, you're picky. Try buying your operators mittens, and then tell them that your company has discovered that mittens generate less ESD so they're making them mandatory now. Then...after a few hours, bring them their gloves back and tell them that
Electronics Forum | Mon Aug 22 10:15:30 EDT 2011 | davidalvarez
we have never had a problem using no-clean flux as far as far as shorts and testing problems, using high pressure test probes helps overcome this. The problem we have had is if a unit comes back down the line a couple of years later we notice that t
Electronics Forum | Wed Sep 14 15:42:45 EDT 2011 | nowak18
During temperature cycling we have determined that the conformal coating wicking underneath our BGAs has caused fractures in our solder balls. One proposed solution is to run an RTV dam around the parameter of the BGA to prevent the CC from wicking u
Electronics Forum | Fri Nov 18 11:43:05 EST 2011 | rway
What type of contamination is it? Flux residue or something else? If you are having contamination issues, you have a problem with your process. Simply washing the boards or using a roller may fix the problem, but you are treating the symptom, not
