Electronics Forum | Mon Nov 06 12:43:35 EST 2023 | milas
Hi We are mounting an microphone device (SMT package) onto a PCB which has an ENIG finish and, observed some contamination on the underside of the device, post reflow. The SEM analysis shows that the contamination has a high level of Carbon. Where c
Electronics Forum | Tue Nov 07 12:07:10 EST 2023 | tommy_magyar
We are mounting an microphone device (SMT package) onto a PCB - how? Surface mount line or hand soldering? Contamination can only come from the solder paste, solder wire, flux, or burning the component/PCB assembly during hand soldering. Unless the
Electronics Forum | Wed Jul 31 09:08:18 EDT 2024 | rayshowers
Activated carbon is utilized to remediate contaminants from a variety of industries, such as fertilizer plants, subway surfers cars, petroleum, pharmaceuticals, cosmetics, and textiles, by removing inorganic and organic pollutants, as well as colors,
Electronics Forum | Sun Aug 23 07:03:09 EDT 2009 | ghepo
OK Eric, is difficult answer at distance without examine the PCB..., anyway in my opinion the problem is the PCB quality. There are two possibility : the crack is between solder and nickel or is between nickel and pad copper. In both situation the
Electronics Forum | Fri Oct 23 17:40:19 EDT 2009 | gregoryyork
So if you have Carbon showing on this would this not mean it is something Organic contaminating the pad.I have seen this before with solder resist depositing over the pad.
Electronics Forum | Sun Oct 13 22:19:28 EDT 2002 | mikestringer
Hi Everyone What lubricants do your maintenance people use for the chains in your Reflow ovens? The manuals for our ovens have one recommendation - but I am always open to other people�s experiences and recommendations. Another option may be easie
Electronics Forum | Wed Sep 10 17:12:55 EDT 2008 | gregoryyork
I dont know about analysis on boards it is OK as long as the people carrying it out know how to interogate the answers.I worked on a problem just last week where an analysis house in China tested the resist then the pads and found on both surfaces C
Electronics Forum | Mon Aug 24 13:12:28 EDT 2009 | ghepo
OK Eric, maybe you're right. My suggestion is to proceed by exclusion. First perform the tape test. Is easy and without costs. You have used many similar PCB without problem, but from the same vendor ? Is my experience that in similar cases the qua
Electronics Forum | Wed May 03 15:00:44 EDT 2006 | patrickbruneel
It all depends on process, design and environment in which the contacts are used. Both have excellent conductivity characteristics Both don't oxidize over time On the other hand gold is much softer then carbon, and after hitting that contact a gazil
Electronics Forum | Tue Aug 27 13:52:24 EDT 2002 | Mike Konrad
MK, In most cases, if the machine is completely closed-looped (prewash, wash, prerinse, rinse, final rinse etc), then the water should not require changing. As with most inline cleaners, there should be a considerable amount of water loss in the cl
