Electronics Forum | Thu May 15 07:37:49 EDT 2003 | pteerink
Have seen similar circumstances a couple times. Possible causes: 1) PCB defect - remove the BGA and inspect/test the PCB for shorts. ( trace short, layer short etc ) 2) PCB defect that only shows up when the BGA is populated - a short somewhere o
Electronics Forum | Fri Sep 12 22:57:13 EDT 2003 | Dean
What is the surface finish of the PCB? Tin? Imersion Silver? What flux is used in wave solder and / or SMT? I have much experience with silver migration and tin wiskers. Both can disappear during a reqork cycle. Both can be extremely difficult
Electronics Forum | Wed May 21 14:47:49 EDT 2003 | radney
On the new 4797 T12W8P feeders we are having trouble picking the very thin chip resistors. Adding foam to the feeder (beneath the pick point) helps, but it only minimizes our frustration. Universal has a reel of these parts and they are looking into
Electronics Forum | Thu May 22 18:47:12 EDT 2003 | russ
I would assume we are talking about a radial leaded electrolytic cap? We use Electronic grade RTV (Dow corning 3145). It sticks good and can be removed if necessary. It is also pliable so you don't have to worry about CTE or other stresses that may
Electronics Forum | Fri May 30 20:54:53 EDT 2003 | jonfox
Conversion refresher: 1 inch = 25.4 mm 1 inch = 25,400 microns 10 microns = 0.3937 mils 10 microns = 0.010 mm so 0.4mm = 400 microns and for s/n/g: 1mm = 3.240783e-20 parsecs (pc) Have some fun with that one!
Electronics Forum | Thu May 29 18:58:41 EDT 2003 | davef
Lead free solder is bad for the environment, while increasing product costs. The US looked at restricting lead use a few years ago, took no action, and has no plans to enact frivolous legislation like the "greens" have foisted upon the Eurolanders a
Electronics Forum | Tue Jun 03 18:34:22 EDT 2003 | Kris
Hi, There have been other studies where it was found that lead-free soloder joints are more reliable than tin-lead solder joints irrespective of test conditions. In fact the automotive industry has been using Sn/Ag for underhood applications for a
Electronics Forum | Fri Jun 06 07:34:43 EDT 2003 | johnw
Rick, my understanding is that the US do not have plan's fr lead free legislation. However the European legislation states that any product entering the european market after June 2006 must meet the lead free std's of the directive. So basically if
Electronics Forum | kadaba |
Wed Jun 04 07:17:10 EDT 2003
Electronics Forum | Mon Jun 09 17:41:45 EDT 2003 | davef
Welcome. You have selected a fascinating area to work. "What is delta temperature? Depends on what someone is talking about. Here's some possibilities: * In process equipment definition, the difference in temperature from one side of conveyor to
