We just had an experience with cracked capacitors during manufacturing,  What we found is the construction of the caps was of poor quality, there were micro cracks under the end cap, and when boards went through SMT, the end caps were pulled due to surface tension and therefore caused the crack of the caps to move.  Because the clearance between the capacitor plates are very tight,  any slight movement of the end caps caused shorting between the capacitor plates.  

 

We tried a different vendor, and when that vendor was used the issues went away. 


________________________________

From: TechNet on behalf of Dehoyos, Ramon
Sent: Wed 6/28/2006 4:56 AM
To: [log in to unmask]
Subject: Re: [TN] Bad capacitors in Boston Scientific Defibrillators and Pacemakers



        That is exactly what the subject was just a few days ago.
Ceramic capacitors that were cracked during depanelization. I second the
motion.
        Ramon



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Tuesday, June 27, 2006 11:09 AM
To: [log in to unmask]
Subject: Re: [TN] Bad capacitors in Boston Scientific Defibrillators and
Pacemakers

Hi,
Everybody seems to be concentrating on the capacitors-it could just as
likely be the assembly process in combination with the PWB design
cracking the CCs.
In fact, from the reported numbers/percentages, that would be my first
guess.

Werner

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