Doug,
12 sigma??? WHAT -- Are you Kidding -- get with the show! We're at 24 sigma!
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, April 23, 2003 10:13 AM
To: [log in to unmask]
Subject: Re: [TN] Omega Testing AND No-Clean
Carrie,
You're welcome. The results that you are seeing are not surprising. OA
flux residues are highly conductive, both in terms of electrical, hence the
shorts, and ionically, hence the high values. The problem goes away with
low solids fluxes because heat converts them to a non-conductive form.
They stay that way unless dissolved back into isopropyl alcohol and water.
Whether or not you get elevated ROSE levels depends on time and temperature
in the ROSE solution. OA residues dissolve quickly, as they are supposed
to, and NC residues more slowly, so you may get a lower ROSE reading with
the NC. The issue of OA flux residues causing conductive shorts in
cleaning shadowed areas is not a new problem. Fortunately, it never
happens here at Rockwell where we have 12 sigma quality and the workers
whistle happily all day, but I've seen it happen other places. Some have
converted to NC materials. Some give extra spacing to the connector to
improve the accessibility for cleaning media. Others have gone to a
pre-soak process to allow cleaning chemistries more time to work on the
flux residues.
I now look forward to the 15 out of office replies.
Doug Pauls
"Morse, Carrie"
<CMorse@CIRTRONIC To: [log in to unmask]
S.COM> cc:
Sent by: TechNet Subject: Re: [TN] Omega Testing AND No-Clean
<[log in to unmask]>
04/23/2003 08:42
AM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to
"Morse, Carrie"
Thanks for the plethora of info from those with great depths of knowledge
--
You know who you are (DOUG, BRIAN!). And...Thanks for leaving the WAR's
(Wise Assed Remarks) out of the discussion! At this point, if you'd like
to throw in any WAR remarks -- feel free! (Now that I have the info I need
my sense of humor is back.)
Jack -- if you have any info I can read please forward.
And just to let those know what I needed the info for....we have a customer
getting unexpected shorts under a connector that was soldered with OA.
It goes away when soldered with NC. Turns out, the component is not
designed
in such a way that allows for sufficient cleaning. I soldered one with OA
and tested it and the results showed NaCl outside acceptance levels
(23.4ug's)
I haven't gotten around to test ones soldered with NC yet, but, now that
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