Electronics Forum | Tue Feb 02 12:31:26 EST 1999 | John
| I have a product using high temperature solder to connect terminal pins to a PCB. The board is single sided copper, no plaiting. The solder is 95% tin 5 % silver. The flux is low activity rosin. The product is a subassembly. When the product i
Electronics Forum | Mon Jul 19 16:26:09 EDT 2004 | davef
Your fab has supplied you with unsolderable boards. They are dewetted, due to some process problem. That they are dewetted on the annular ring of the via indicates that the problem is with the board and not with your paste. [We assume you do not p
Electronics Forum | Tue Dec 13 17:41:04 EST 2011 | davef
A Study Of 0201’s And Tombstoning In Lead-Free Systems, Phase II Comparison Of Final Finishes And Solder Paste Formulations http://sheaengineering.com/Documents/APEX%2008%200201s%20and%20Tombstoning%20phase%202%20paper.pdf CONCLUSION The condition
Electronics Forum | Sat Aug 29 21:42:46 EDT 2015 | sarason
When I made my previous reply, I don't think I was very clear in what I said, so like any politician I will rephrase my response to the question. My intent was that the board didn't have enough soak time leading up to final reflow. So what was happen
Electronics Forum | Fri Apr 13 22:38:19 EDT 2001 | edylc
Hi , Could you be seeing the nickel under the gold plating because you are removing some of the Gold with the Kapton Tape....?? You mean , the adhesive properties of the kapton tape will cause the gold plating on the gold finger to be somehow peel of
Electronics Forum | Mon Nov 25 12:16:03 EST 2002 | Dragonslayr
I have conducted 2 BGA rework studies over the last 3 years or so. Each time I came to Air-Vac as the prefered machine. I looked at all the models mentioned in the other posts here plus a few more. As a final step in the study I took the actual oper
Electronics Forum | Mon Aug 16 16:57:06 EDT 2004 | Shean Dalton
Try to observe the board as it exits the wave, look for solder snapping as the leads finally exit the solder. The surface tension could be such that a "string" of solder stretches away from the wave until it finally breaks. Then, as the string reco
Electronics Forum | Fri Sep 24 08:19:35 EDT 2004 | Rob
Hi FengAng, Sorry about the misunderstanding - last time I was out there all of the front end SMT equipment was very good, but the final assembly of the phones into cases was being undertaken by hand, whereas in Europe we were seeing a lot of automa
Electronics Forum | Mon Jun 12 10:46:37 EDT 2006 | mhanc
I am trying to help a customer with a problem. His Process Tech is out and the operator is trying to load a program via floppy. When trying to load on the Amistar 5630 the following errors occur: Data Type Error (level.4) we continue to load and
Electronics Forum | Sun Nov 19 22:21:37 EST 2006 | KEN
When you say "SMD" I am assuming you are refering to a component. But in your description you mention these are some type of "boards". "flatness" or coplanarity is a function of the application and process. I think in your case your standards wo
