Electronics Forum | Thu Mar 26 11:25:21 EST 1998 | Earl Moon
In December and January (1997 & 1998) a number of people requested information regarding component cracking. I overlooked this until recently thinking design and process requirements were violated. After reviewing the last 14 months consulting effort
Electronics Forum | Wed Oct 26 11:51:06 EDT 2005 | moonshine
Don't V score, unless you absolutely have concurrence with your QUALIFIED fab and assembly operations. Routing is best for all chip devices close to board edge. It's better and cleaner for everything when seeking quality and reliability. Visit htt
Electronics Forum | Wed Feb 05 11:38:46 EST 2003 | Stephen
Don't forget placement. I"ve seen chips broken when they are being placed because they were thicker than the parts data used for them. This is not an issue on Panasonic machines because they measure the thickness of parts but I have seen it happen
Electronics Forum | Thu Mar 02 13:20:26 EST 2006 | inds
jagman, take a hard look at a capacitor under the high mag microscope before you start assembling it.. I remembering seeing cracks even before the assembly. apparently all chip capacitors have crack at the intersection between the capacitor head and
Electronics Forum | Tue Feb 28 16:09:27 EST 2006 | outgasser
Does anyone have any insight as to the cause of cracked chip capacitors during SMT? Z-stop? Thermal shock? Any help is appreciated.
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 | 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 | Tue Feb 28 16:53:26 EST 2006 | slthomas
Depaneling with the parts in question near a V-score?
Electronics Forum | Tue Feb 28 17:08:09 EST 2006 | outgasser
Steve, I believe you hit it right on the head! Thanks! Gary
Electronics Forum | Thu Apr 10 07:24:56 EDT 2003 | pjc
I had a similar problem with cracked caps. I checked all my processes and finally found that the caps were cracked in the tape. Check the condition of the caps in the tape. This was unique to one mfg.- EPCOS.
