Electronics Forum | Thu Jan 08 15:03:40 EST 2004 | dwzeek
We have an ongoing problem with our QFP144 packages soldering. It has not received much attention until late due to some customer failures. Most of the failures would show up in ESS testing and be repaired. The failure rate is about 2 in 1000 parts f
Electronics Forum | Mon Jan 19 14:54:38 EST 2004 | cyber_wolf
How did you come to the conclusion that you are having a cold joint problem. Just by appearance ? As Dave stated if you have any of the metals that he listed in the joints they will appear to be dull and grainy sometimes. But... Dave, I will have t
Electronics Forum | Wed Jan 28 09:46:27 EST 2004 | stefwitt
I don�t know, what you are going to do with this type of request. Are you indeed making up your mind because a few readers give their hands up or down? All the machines listed above do a good job. However, consider that you will be married for a long
Electronics Forum | Wed Feb 11 12:38:11 EST 2004 | peterson
As someone who has worked for a contract manufacturer in China, I can tell you that regaining manufacturing jobs in the US will be a difficult task. Difficult, but not impossible. Many companies are discovering that manufacturing has only ONE advanta
Electronics Forum | Thu Mar 04 10:45:19 EST 2004 | Robert
My company is relatively small but we have a SMT line. However, we don't have a stencil cleaner so I resort to a spray bottle of denatured alcohol, wiping it with a cloth and then using a toothbrush to brush the apertures. Finally another wipe down a
Electronics Forum | Thu Apr 01 13:16:56 EST 2004 | Jimmy
>When these boards are built new do we not have solder >>paste on the ground pad and then reflow? Has this caused >>any misregistration for you? We didnt assemble these boards so I have no knowledge of the manufacturing process that was implemented h
Electronics Forum | Tue Apr 13 22:48:11 EDT 2004 | Ken
I assumed the balls were tin/silver 221C or tin/silver/copper 218C liquiduous....but, this is obviously not the case. It looks like you balls are almost pure tin (mp=238C) You are correct. This is exactly the same as using 10/90 high temp balls o
Electronics Forum | Tue Apr 13 20:57:14 EDT 2004 | Mike Konrad
Hey Dreamy, Dave is correct. If you attempt to clean your water soluble (OA) flux with water only, you will turn the no-clean flux white. No inspector or end-user will accept this. If a proper cleaning system is not available to you, then I would
Electronics Forum | Fri Apr 16 11:03:35 EDT 2004 | davef
Your copper corrosion is not good. It indicates that you have not done a good job in cleaning. [We assume this is a medium green color, not unlike the color of the solder mask on your board, that is almost like a translucent lacquer; rather than th
Electronics Forum | Tue Apr 20 08:19:07 EDT 2004 | revathichan
We the biggest technical institution in Asia now proposed a SMT theory and SMT Laboratory in our college to the final year Electronics and Communication Engineering students. The Industrial Giants in SMT in Assembly, Process, Testing, Repairing, Sold