Electronics Forum | Wed Sep 18 19:43:12 EDT 2002 | dragonslayr
One more variable I've remembered - pad height with respect to solder mask height. Pads being too low can cause stencil "gasketing" problems that in turn allow more paste to be deposited than needed. Are your fabs HASL or some other media?
Electronics Forum | Wed Sep 18 16:12:41 EDT 2002 | kenbliss
Hi Dilbert I do not know if you meant to use the words argue in your posting, but assuming it was not sarcastic I would like to offer my point of view as an equipment supplier to people like you. First the customer is not always right but they are
Electronics Forum | Thu Sep 19 21:17:50 EDT 2002 | Sam
We had encountered similar problem before. But the cause was found out to be the poor good plating, instead of contamination. The way we dealt with that was sending them to the supplier for rework. It may be the fastest and most relaibility way. Goo
Electronics Forum | Fri Sep 20 15:44:00 EDT 2002 | pjc
Do you have a Panasonic & Toshiba camera? What are the MPM p/ns your looking at? Whats the problem? Noise perhaps. If noise try checking the metal cylinder to the right of the camara housing. The set screws can loosen up. Tighten up all the screws.
Electronics Forum | Tue Oct 08 09:51:10 EDT 2002 | larryk
Russ, I use the R562, it has a longer tack time then the Hm531 and have found no problems with voiding on my BGAs. You may want to evaluate this formula also Larry
Electronics Forum | Tue Oct 08 18:54:04 EDT 2002 | BobbyB
Hey Russell. The boys at Air-Vac Engineering can help you solve your problem. Are you using an DRS system. If not, you are probably out of luck and should scrap the boards. Cheers!
Electronics Forum | Wed Oct 09 17:44:46 EDT 2002 | alj
I guess you don't use one. Call them and I'm sure they will solve your problems and teach you a little bit about BGA rework profiling... CHEERS!
Electronics Forum | Thu Oct 03 10:02:08 EDT 2002 | davef
Your problem is likely not the Pd-Ag surface layers, but the underlying metal to which you need to wet. Either a base metal is: * Contaminated and poorly wettable. OR * A material [eg, Alloy 42 (check with magnet), Kovar, etc] that is inherently dif
Electronics Forum | Wed Oct 09 12:29:14 EDT 2002 | ppcbs
We have been encountering black pad contamination on gold plated boards mainly affecting BGA components during assembly. This problem has been noticed with many of our customers that are using an array of fab vendors. Does anyone have a solution fo
Electronics Forum | Tue Oct 22 18:29:30 EDT 2002 | bdoyle
man, I've gotta learn to read the whole thread before trying to figure out a problem. I literally stared at your post for a good 5 minutes.