Kevin,
the problem is: when you complete your test (i can think about many
other tests, such as humidity/bias...because it is polyimide, not FR4),
are you sure the board still can be used for the field?... He is only
having on the rework board, hopefully, he only need to deal with one or
two (not many, otherwise, we are dealling with QA problem)....How much
effort you should put in for unique one or two, possibly due to
non-compliance of procedures....(too many "ifs")...Resistivity test at
current stage will be a "pass"...the trick is, who knows what is the
impact at end of life of the product...(don't like to deal with
polyimide...if steve know about his vendor product, such as weight loss
value, he may have some guesstimate of the quality v.s. the measling
impact)...
jk
-----Original Message-----
From: PERALTA, Kevin (BREA) [mailto:[log in to unmask]]
Sent: June 5, 2001 9:41 AM
To: [log in to unmask]
Subject: Re: [TN] Measling...
Hey Joyce! Don't go to far out there. Remember "Inspect to Accept"!
Since there is only "Acceptable" criteria mentioned in the 610 document,
I would suggest to Steve to perform a dielectric resistance test to ease
his mind. Unless heat is going to be applied to the board again, the
condition probably won't progress.
Kevin L. Peralta
Senior Quality Systems Analyst
TRW Aeronautical / Lucas Aerospace
-----Original Message-----
From: Joyce Koo [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Tuesday, June 05, 2001 5:35 AM
To: [log in to unmask]
Subject: Re: [TN] Measling...
I am no so sure...Steve is using polyimide board, which most likely is
for high reliability usage (not off the shelf items for commercial
usage)...I would not use it if it is for avionics (measling cross the
sky is scary...it may infect the stars...)..jk
-----Original Message-----
From: <Peter George Duncan> [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: June 4, 2001 10:23 PM
To: [log in to unmask]
Subject: Re: [TN] Measling...
No. The measling looks quite minor and doesn't come close to other
traces
or pads. Unless I'm mis-judging the scale of the picture, the affected
area
isn't carrying high power either, so I don't see that there's a problem.
Pete Duncan
"Stephen R.
Gregory" To: [log in to unmask]
<SteveZeva@AO cc: (bcc: DUNCAN Peter/Asst
Prin Engr/ST Aero/ST Group)
L.COM> Subject: [TN] Measling...
Sent by:
TechNet
<[log in to unmask]
ORG>
06/05/01
02:58 AM
Please
respond to
"TechNet
E-Mail
Forum.";
Please
respond to
SteveZeva
Hi ya'll!
I took a few days off last week, and came back to be confronted with
some
boards that have been measled from rework...
Go to: http://stevezeva.homestead.com/index.html
<http://stevezeva.homestead.com/index.html> to take a peek.
The boards are polyimide, and it obviously appears that there was too
much
heat used when they were reworked...also they may have not been baked
prior
to the rework...I was told that they were, but you know how that goes.
I know what the -610 says about it, it says it's acceptable as long as
the
assembly performs as specified. There isn't any burns or anything around
any
of the barrels, just the measles...and it's only on one 14-pin DIP
location.
Would any of you have any REAL hesitation about accepting this assembly?
Thanks!
-Steve Gregory-
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