Electronics Forum | Fri Apr 18 16:53:25 EDT 2003 | takfire
DST, What was the crack signature? Was the crack parallel with the internal electrodes or 45� with the terminal electrode? It is also important to determine the orientation of the failed caps on the PCB (in regards to depaneling). Perhaps the cap
Electronics Forum | Fri Apr 18 19:15:49 EDT 2003 | adlsmt
Please elaborate on "De-paneling method" vs. boards being "snapped out of thier pannel". Read the last post before mine again.
Electronics Forum | Mon Jun 21 07:00:16 EDT 2004 | N.Berkhoudt
May be a little late for you, but we experienced the some problems with decouple 100 nF C's. Siemens has reported problem in production in november 1998.
Electronics Forum | Thu Sep 11 17:15:07 EDT 2003 | davef
We've seen two source of this: * Poor cure recipe [lookup 'microcanyon' in the fine SMTnet Archives] * Moisture absorbing glue formulations [lookup psi or aguayo in the fine SMTnet Archives]
Electronics Forum | Tue Feb 28 17:09:40 EST 2006 | outgasser
PWH, Thanks for all your input. All these areas are of concern which I will look closer into. thanks! gary
Electronics Forum | Wed Mar 01 12:28:48 EST 2006 | Chunks
Round cracks that look like it's from a placement are generally from a too big Delta T in wave (been there done that). All other cracks are anomalies. Ya gotta see it find it.
Electronics Forum | Mon Apr 25 11:39:41 EDT 2011 | jmw
I have worked on the mirae's. Easy software...with a few bugs of course.....Accuracy is great from 0201 on up. Like them better than the Juki's or Samsung. Dont know about other machines. Good luck
Electronics Forum | Tue Jun 10 11:51:15 EDT 2014 | rway
Your target ppm in on the Juki machine a take it. So it's rejecting these parts due to the inversion? Any way to disable this. A right-side down resistor is not ideal, but it will certainly work electrically. Reese
Electronics Forum | Tue Jun 10 14:04:08 EDT 2014 | rway
Perhaps neither. I assume the part is T&R. It's flipping inside the tape before placement. I don't know how the nozzle could be doing it. There could be excess vibration on the feeder which is causing the part to flip. Just a thought.
Electronics Forum | Tue Jun 10 17:13:44 EDT 2014 | grauen06
I have seen this on a MyDATA machine and we had to slow our feed rate of the feeder down. That seemed to do the trick. We concluded the carrier tape was too large for the part, but our vendor didn't really seem to care.
