Richard,
MIL-P[RF]-55110/50884/31032 documents clearly state "no repair", of course
if these are military product built to IPC-6010 series then repair may be
performed I agree repair is allowed.
Many OEMs such as Raytheon, LMCO, Boeing, provide PCB suppliers with PCB
Fabrication or Acceptance Specifications which state the same (no repair, or
repair with prior communication), I've reviewed many of these and have had
to comply with these requirements.
I don't disagree that there are many OEMs which would accept this particular
repair (repaired delamination) But in my experience over the past 10 years
I've not seen one of my customers even consider discussing repairing
delaminated product, and as mentioned, today I would not even entertain the
idea of asking them.
Did you say you're building PCB's costing $50,000.00...wow, I'm impressed,
I'm now interested in the design you're building? What material type, layer
count, features, etc. If it does not violate any proprietary of NDA of
course.
Franklin
-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Wednesday, September 13, 2006 11:49 AM
To: TechNet E-Mail Forum; Franklin D Asbell
Subject: RE: [TN] Delamination
Wrong, Franklin.
Nearly all medical, industrial, aerospace, military, and government agencies
recognize that qualified repair processes, including for delamination, are
perfectly reliable, in most cases even more reliable than the original
undamaged hardware. There is no more risk in performing a certified repair
procedure than there is in doing standard rework.
That is the reason MRB boards exist in large military OEMs and CEMs such as
Honeywell, Rockwell, GD, etc., etc., with documented, qualified, and
certified repair procedures, non-conforming material segregation and
handling methods, trained and certified operators and inspectors,
traceability systems, and quality departments.
Many of these companies recognize the incidential value in these systems,
including the impact of not having to delay a program, re-order new parts,
re-inspect new parts and boards, re-stock replacement parts and boards,
re-assemble replacement assemblies, re-test, etc, etc.
Simply scrapping a board because it is delaminated may be acceptable for
your product, but many programs cannot afford to scrap a single bare pwb
valued at $50,000 for example, let alone a finished assembly valued at more
than $500,000 because it has a delamination or other repairable defect. And
yes, pwbs and assemblies with those values are becoming somewhat common in
the industry today, what with the rapidly escalating level of technology.
And in most cases, by the time you add up the cost of all of the above
replacement activity, the real hidden cost of scrap becomes a factor in even
the least costly commercial, high-volume products.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin D Asbell
Sent: Wednesday, September 13, 2006 11:23 AM
To: [log in to unmask]
Subject: Re: [TN] Delamination
I'm curious what customers would actually accept repaired delaminated
product.
I read repair procedures for delaminated conditions many years ago and in my
opinion the end result presents many reliability possibilities.
When I see delamination, I see scrap.
Franklin
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, September 12, 2006 1:22 PM
To: [log in to unmask]
Subject: Re: [TN] Delamination
Helena, I forgot to mention that many delaminations are quite repairable.
There are repair procedures outlined in IPC-STD-7711/7721.
They are not automatic scrap. This requires MRB authority from your
customer, however.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pasquito, Helena
Sent: Tuesday, September 12, 2006 11:45 AM
To: [log in to unmask]
Subject: [TN] Delamination
Hi TechNetters,
Let me ask a question; I know delamination is bad, but why? What is the
failure mode to the board when a board delaminates and would there ever be
an instance that a board that delaminates is still OK to use? This is a
Class 3 application. Yes, I know what the IPC standards say but not real
sure about the board process. Yes, I "googled" and there is a lot of stuff
out there. Maybe someone can recommend some reading material (hopefully
short and sweet and to the point).
Thanks!
Helena
Helena Pasquito
Manufacturing Skills Instructor
M/A-COM, Tyco Electronics
1011 Pawtucket Blvd., M/S 107
Lowell, MA 01853
978-442-5024
[log in to unmask]
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