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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