We do similarly here.  If ICT is available, we have a stripped down version of the ICT to
verify all IR soldered parts.  You can get some failures on caps that haven't cooled
sufficiently after reflow, but they can be verified visually.

Gary Camac

"Stephen R. Gregory" wrote:

> In a message dated 06/26/2000 6:07:32 PM Central Daylight Time,
> [log in to unmask] writes:
>
> > Hello Technet,
> >
> >  I need some advice from the SMT experts. The issue is around the placement
> >  of wrong SMT reel components on boards due to vendor or process issues
> >  (errors in labelling, parenting the reel to the wrong feeder, etc). Any
> >  suggestions on best practices for incoming material quality processes
> and/or
> >  suggestions on the most effective ways to verify that the right components
> >  have been placed on the line before populating the boards?
> >
> >  Thank you!
> >  Monica Mihai
> >  Process Engineering
> >  Nortel Enterprise Solutions
> >  Tel.: (403) 735 - 5488 (ESN 775)
> >  Fax: (403) 291 - 7488 (ESN 775)
>
> Monica,
>
> Sounds like you've been bit once or twice! Starting from the beginning, one
> needs to check the part at incoming inspection by measuring the value upon
> receiving the part, if it's possible. If there is some sort of marking on the
> part that one can use (In the case of IC's) then that's all you have to go on.
>
> Things can get mis-labled at incoming receiving inspection. I have run across
> that more times than the vendor sending us the wrong part. But most of the
> time a part being loaded wrong on a board has been because of the operator
> putting the wrong part in a feeder...
>
> I've always done a "first article" on a assembly when the first board comes
> off the line just to make sure the placement program is correct. If
> everything is verified correct, then during the run to make sure the right
> part is loaded into the feeder, I've put in-place what I've called a "Feeder
> Change Log". When a part runs out on a feeder, there needs to be a "second
> set of eyes" look at the part (measuring it if need be as in the case of
> capacitors) and also verifying it to the feeder position on the machine
> set-up sheet.
>
> This came from being burned at a past employer where we were placing some
> capacitors on the bottomside of a board (de-coupling caps), that were epoxied
> and wave soldered, and not discovered wrong until ICT...the caps went 105 per
> board. Placed a whole reel (5,000 parts) wrong (FUJI spits them guys out in
> about 1/2 hour)...you can imagine how much rework there was...
>
> A "Reel Change Log" prevented the same thing from happening for as long as I
> was there. This just gets people to stop and slow down to MAKE SURE they're
> putting the RIGHT parts in the CORRECT feeders!!!
>
> -Steve Gregory-
>
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