Electronics Forum | Fri Jun 10 12:05:54 EDT 2005 | jdumont
Hi all, we are just getting into using local fiducials for BGAs. My question is, in addition to having to be on the same diagonal (opposing corners) do the fiducials have to be the exact same distance from the center of the part? I always thought yes
Electronics Forum | Fri Jun 10 21:22:36 EDT 2005 | KEN
JD, fiducials are merely land marks. The vision processor will measure the actual location and compare it to the CAD location. It does not care if the design is symetrical, asymetrical or what. In the case of a single center design fiducial (which
Electronics Forum | Sun Jun 12 19:22:52 EDT 2005 | techknow..
When examining a Bga using an Ersascope, I found that all the joints where good. However I found that the first few solder balls from left to right ( vice versa ) seem higher than the middle solder balls. It appears that the body of the part is flex
Electronics Forum | Mon Jun 13 04:26:00 EDT 2005 | Joris Groot koerkamp
For the lead free reflow process we tested with our Vitronics 500smr oven. To reach the high temperature of the lead free profile was no problem. We are not using an active cooling system so the pcb's are maby to hot wen the leaving the oven. Can an
Electronics Forum | Tue Jun 21 07:39:23 EDT 2005 | davef
There's a fair amount of material on cooling rates for lead free on the web. Look here: * http://www.speedlinetech.com/docs/Cooling-Slopes-Lead-Free-Reflow.pdf * http://www.findarticles.com/p/articles/mi_qa3776/is_200412/ai_n9473486 * http://www.m
Electronics Forum | Mon Jun 27 15:02:55 EDT 2005 | cmiller
Thanks for the reply. I had the instructions out of the manual but after re-programming we had all kinds of wierd stuff going on. After re-setting the PC several times it worked fine. Can I get a copy of the instructions you have? It would be appreci
Electronics Forum | Thu Jun 16 18:11:33 EDT 2005 | Jason Fullerton
The IPC standards have NO bearing on the state of the RoHS Directive - Europe isn't going to change the rules because the IPC has a few draft standards floating around that create a category "RoHS Compliant, except I still have lead in my solder". Th
Electronics Forum | Mon Jun 13 15:54:20 EDT 2005 | peter ng
Our technical side facing the printing shifted at the Sony SP750 Printer.It happened randomly exspecially when the printing X axis offset is more than 1.5mm.We using the Cad fiducial mark at our programme but the problem still remain.We need some ad
Electronics Forum | Mon Jun 13 16:15:04 EDT 2005 | peter ng
Dear all, We faced some major issue in setting our company target to 500 points per million at machine throw rate.It might be caused by human error,machine,feeder,environment or other factor.We need some opition and advise on how to achieve this targ
Electronics Forum | Mon Jun 13 16:17:30 EDT 2005 | peter ng
Dear all, We faced some major issue in setting our company target to 500 points per million at machine throw rate.It might be caused by human error,machine,feeder,environment or other factor.We need some opition and advise on how to achieve this targ
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