Electronics Forum | Wed Sep 19 09:34:08 EDT 2001 | jschake
Both FormFlex and Grid-lok tooling systems are marketed as compliant tooling systems. Both are able to conform to the variations of the topography on the bottomside of a substrate to provide full support during printing of 2nd side assembly. The ba
Electronics Forum | Tue Oct 16 07:00:06 EDT 2001 | genglish
Hi all, I have a problem and would gratefully take on suggestions, firstly let me explain the situation: We are currently screen printing adhesive, using a method similar to DEKs 'Pump Print', The adhesive we are currently using is supplied from Alp
Electronics Forum | Wed Mar 27 21:20:30 EST 2002 | davef
There is two major BGA coating camps. * Camp #1: "We require the coating to be under low stand-off devices but with no filleting. So we apply a thinned dip coat first, and then top-off with a proper spray coat" * Camp #2: "We want no coating under th
Electronics Forum | Wed Jul 03 10:32:05 EDT 2002 | davef
First, we have talked about drying / baking / demoisturizing / whatevering bare board previously. Search the fine SMTnet Archives to get started on recipes. Second and more importantly, you gotta fix this delamination problem. If it is delaminatio
Electronics Forum | Tue Aug 13 12:22:03 EDT 2002 | dragonslayr
A bit of gray area for you. consider the application over the specmanship. Why are the stiffeners there in the first place? Is the rigidity requirement a high function i.e. very necessary due to potential shock and vibration , etc.? The soldering is
Electronics Forum | Fri Jan 03 19:17:12 EST 2003 | Mike Konrad
Hi Richard My experience with R.O.S.E. testers has been positive with regard to detecting ionic contamination (even exceptionally low levels). As previously mentioned, a good R.O.S.E tester will be able to detect minuet levels of ionic contaminatio
Electronics Forum | Thu Mar 20 13:22:27 EST 2003 | bmaheu
James, I've done some extensive studies cleaning BGA's while I was employeed by one the companies you are considering. In an attempt to avoid being commercial I will use general statments to address your question(s). The key to cleaning underneath
Electronics Forum | Tue Apr 01 09:58:52 EST 2003 | davef
You're entirely correct. The gold is most likely gone away. [Don't forget you can check if the surface is still solderable with a hand soldering iron.] We're not sure it it will give you the results you seek, but consider using a dye penetrant fai
Electronics Forum | Wed Apr 07 22:15:31 EDT 2004 | davef
We're not familiar with the AUG5 from Taiyo. [It doesn't show on their US site.] Is it liquid photoimageable? Printed solder masks are more likely to bleed. But you wouldn't have any solderability with bleed. Your plating seems acceptable [if th
Electronics Forum | Sat May 21 08:22:42 EDT 2005 | davef
We agree with the previous poster. 50 pounds sounds like a lot. We don't know: * How often you dedross? * What method you use for dedrossing? * What portion of your dross that is dross versus solder? * How many boards do you run between drossings?
