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 | Sat Feb 15 06:40:14 EST 2003 | Hans Koerner, Germany
It is a serius problem with that mulilayer ceramic caps! In automotive applications you have to use 2 in series for one single cap. During depanelizing you create a mechanically wave in the board, so 3.. 4 mm. Best way is not to do such a wrong desig
Electronics Forum | Tue Feb 28 16:58:39 EST 2006 | PWH
Too fast heating/cooling rate in reflow (look at mfg's spec.). Z "overdrive" on pick and place or chipshooter though unlikely I would say. Depanelization method (bending a scored board to break it is tough on things). Bad PCB design - cap. too clo
Electronics Forum | Thu Sep 11 15:23:31 EDT 2003 | Peter L.
I have come across a rash of failed assemblies that have 0805 capacitors and resistors, bottom side glued, wave soldered and washed. Trouble shooter reported touching up the solder joints on a few areas and the boards would pass test. I had a look a
Electronics Forum | Mon Dec 04 11:14:03 EST 2000 | JimH
All, For what it's worth the only time I have experienced this phenom was when board support pins were misplaced on our chip shooter and these components (previously placed) were resting on the pins and cracking when we populated the other side o
Electronics Forum | Wed Dec 06 07:41:48 EST 2000 | John
To the post on the depaneling system. Almost any smt component can (and will according to Murphy's law) be damaged during hand breakout. Our company began using SMT a few years ago, and our primary customer absolutely will not allow us to hand brea
Electronics Forum | Fri Dec 08 23:02:24 EST 2000 | LeeKibler
Beware the foam fluxer. I had a problem with cracked caps that just about drove me off the deep end. I discovered that my foam fluxer air knife was not turned on resulting in excessive flux. The excessive flux (VOC free) was not properly dried off
Electronics Forum | Mon Mar 03 05:35:21 EST 2003 | Kelly
We just had this issue a couple months ago with a single sided FR-4 board which was scored. We found that the design was a factor but also the depth of the v-score. Since then we have re-designed the part further away from the score line. At the same
Electronics Forum | Wed Aug 18 08:58:49 EDT 2004 | M.Enright
We are finding cracked capacitors at both first pass and second pass.
Electronics Forum | Thu Oct 21 15:33:56 EDT 2004 | Indy
I have seens cracks from AVX capacitors too. The thing is they already have micro cracks that are not visible to naked eye. When the capacitor is stressed the crack expands. One way of mitigating this is by tweeking your process. See how your singula