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May 1998

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 8 May 1998 23:55:25 +0300
Content-Type:
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Ed Cosper wrote:

> Hmmmm..... another coupon dilemma. You know Ralph, this always seems
> to be an ongoing issue. Frankly I feel way too much emphases is placed
> on these dang coupons.
> Coupons are a good if used as a process indicator. They don't by any
> stretch of the imagination ( in my opinion ) mean the board is good. I
> don't care where  you place them.
> I wonder just how many of us can tell stories of  countless dollars
> lost due to coupons.
> Some customer will section a board regardless of what your coupons
> look like and if the board shows a non-compliant condition ... guess
> what? Typically there would be a push to scrap the entire lot. After
> all, if your coupon is acceptable and the holes sectioned from the
> board is not.... well then.... You coupons obviously have  no bearing
> on acceptability. Now on the other hand, if the coupons shows
> unacceptable, there is a tendency by many to scrap the lot regardless
> if the board sections good
>
>
>
> Just my two cents.
>
> Ed Cosper
>
> ----------
> From:  Vaughan, Ralph H[SMTP:[log in to unmask]]
> Sent:  Friday, May 08, 1998 8:44 AM
> To:  [log in to unmask]
> Subject:  [TN] PWB Test Coupons
>
> Greets
>
> How about a relatively non-technical arguement to chew on?
> For years we have procured pwb's to the mil- or ipc-d 275 rules from
> several very reputable suppliers.  All the boards are delivered with a
> 1
> to  2 inch wide manufacturing panel surrounding the board, which is
> routed off after we complete assembly.  In all cases, the shops have
> regarded this panelized board as "the board" and have placed the test
> coupons one-half inch from the"the board", as the spec requires.  We
> have always concurred with this, as we didn't particularly want our
> manufacturing panel cut up to remove coupons, and we understand that
> this is pretty much industry practice, and also feel that having the
> coupon one inch closer to the circuitry makes no real dif.   Now,
> another faction of my company with a more purist attitude tells me
> none
> of my boards are spec compliant because of coupon placement.  We have
> already gone to the needless trouble and expense of modifying drawing
> notes to allow this condition, so I'm not in a panic,  but I'd still
> like the decision from the jury.
>
> Thoughts?
>
> Thanks
>
> Ralph
>
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   Ed and everyone!
It's true,of course,that customers prefer to check a board from the
batch, we are doing so too.
But, I would like to give  our board suppliers confidence too, so,
please tell me how they
inspect the goodies before sending those boards which are scrapped by
the customer later?
Are we expecting some relevant changes in the future-standards for
example?
And the boards we check cost money too.Sometimes a big lot.
Thank you,
Gaby

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