Electronics Forum | Wed Oct 25 12:24:02 EDT 2000 | Philip
Hi Chris! I hope this will help you! The CBGA uses an array of high melting point solder spheres(Sn10/Pb90) to connect its ceramic chip carrier to an epoxy glass (FR4) PCB using eutectic (Sn63/Pb37) solder joints at both ceramic and card inter
Electronics Forum | Mon Oct 09 17:49:29 EDT 2000 | sean
Hello John, The biggest stumbling block is going to be taking these responses and applying them to your assembly process much the same as trying to make other manufacturers' defect levels apply to your process. Ultimately, the overall quality of yo
Electronics Forum | Wed Nov 01 12:10:20 EST 2000 | Jeff
charles, i can appreciate the hand held "reel to reel" scanner as a good solution that is very cost effective. during my smt supervision days we had a number of part loading checks. 1. load plan check, 2. scan check, 3. reel to reel manual check.
Electronics Forum | Mon Aug 14 18:24:36 EDT 2000 | Dave F
James: Here's a starting point: 1 www.wwnet.net/~rkroy/wp-inb.html 2 www.sas.com/otherprods/jmp/Home.html 3 www.micromeg.com/ 4 Boeing SQC (avail. from Boeing for $100) is a good little package for DOS machines. 5 For Windows, SPC KISS from Air Aca
Electronics Forum | Fri Aug 04 12:57:34 EDT 2000 | Steve Thomas
James, we used to use 3 clamshell type printers (one of which did have a two camera vision system, and did all our fine pitch), but had limited success with 20 mil pitch. 25 mil pitch was no problem. I suspect that you'll find people that have had
Electronics Forum | Wed Jun 14 08:08:56 EDT 2000 | Wolfgang Busko
Hi ji tae, we had a similar problem with QFPs 0,5 pitch processed by one subcontractor. The symptoms we noticed were: - the solderjointshape and wetting looked normal - the surface had a dull gray appearance - by pushing a lead sideways with a tweez
Electronics Forum | Fri Jun 02 17:19:56 EDT 2000 | Big K
I am currently experiencing several problems with QFP's on one of our IP3's. The first problem is with QFP240 devices. We are experiencing a high reject rate with these parts when using vision type 100. What appears to happen is that the vision syste
Electronics Forum | Tue May 16 20:59:46 EDT 2000 | Dave F
Ashok: Haven't unloaded that ESD Coordinator job yet have you? Smocks: Don't work, they're hot, and no one likes them, but they put up with them (sort of). Now if they knew they didn't work, all the customer PR in the world wouldn't help. The bi
Electronics Forum | Fri May 12 11:48:35 EDT 2000 | Mike Konrad
Advantages of using a stencil cleaner verses manually cleaning stencils: 1. Using a stencil cleaner ensures no direct contact between operator and solder paste (lead being the primary concern). 2. Most stencil cleaners remove 100% of the solder p
Electronics Forum | Sat May 06 08:42:18 EDT 2000 | Dave F
Hi Steve: Easy question, Klein Wassink is THE BOOK. It is head and shoulders above the others. Coombs: Very good book, focused primarily on board fab with some discussion on assembly. Lea: A dated, once very good book. Rahn: Average book. Actu
