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April 1999

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Subject:
From:
Paul Klasek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 7 Apr 1999 22:02:45 -0700
Content-Type:
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Hi Werner
I'm pretty sure you came across it in your reliability life :
What's the inspector's (class 2) issue (correctly so unfortunately) :
1
He says ; yes we validated the specific profile (amalgamated comp & flux
specs) performance on specific cycled regime (785) ; great ;
the joint integrity ; life and structure is known to comply with all tied
specs .
2
Than he says :if you touch any of the SMD's therefore after, you alter the
validated conditions and the product (joint) is no longer known entity,
because unless the process (repair) conditions replicate those used for
cycled samples AND comply with all of the other (component manufacturers
specs) ties ; it's no longer under validated umbrella .
He for example says if the specific cap with specified raise utilizing
specified flux activation window does not go through the resulting path when
it's iron soldered : > I should retire unless I can explain why I "violate"
all specs concerned with this crude "process" .
If I'd tell him , hey everybody (except class 3 I hope) does so ; he'd
ground me for sure ; notwithstanding I could only agree with him :
he's telling me I'm bustin' the component AND the joint ! I knew it's there
; didn't think he'd go this far on class 2 ; but he does .

The barrel cracks are fairly simple issues ; I have more of the regulatory
problems where we're required not to have invalidated holes (like "repairs")
in the overall process ; and even if I'd validated (cycled) the iron joint
integrity ; I'd still have to research why do I go against manufacturers
(components; flux) specs.

Being medical oem I can not wiggle out of it ; I just hope somebody out
there in similar poo pioneered something what essentially lazy bum like me
could follow . IT's with their long life high volumes could have data on it
as well .

So to sum it up again ; did anybody have the sensors and crossections and
cycles on this subject (reflow v iron) ?
Any shocked components life stats ? Satellite falling anecdotes ? Telephones
recalls ? Don't tell me you have nothing .
You don't have to specifically mention buddies in Nortel have had this X$M
recall because of this and that ; just a gist of it ?
How (ever?) was this undeniable Effect addressed ?

Thanks A lot again (you right with that heartburn ; not mentioning the
headache)

Paul

> ----------
> From:         [log in to unmask][SMTP:[log in to unmask]]
> Sent:         Thursday, 8 April 1999 12:18
> To:   [log in to unmask]; [log in to unmask]
> Subject:      Re: [TN] Repair's Adverse Effect
>
> Hi Paul,
> I do not know what your inspectors are looking for, but here the general
> heartburn about manual soldering operations has to do about what they can
> do
> to plated-through vias, like barrel cracks and innerlayer separations.
> Those
> problems are typically found in areas were manual soldering operations
> have
> taken place.
>
> Werner Engelmaier
> Engelmaier Associates, L.C.
> Electronic Packaging, Interconnection and Reliability Consulting
> 7 Jasmine Run
> Ormond Beach, FL  32174  USA
> Phone: 904-437-8747, Fax: 904-437-8737
> E-mail: [log in to unmask]
>

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