Ingemar,
You should see the nervous twitch I've developed!!
David A. Douthit
Manager
LoCan LLC
"Ingemar Hernefjord (EMW)" wrote:
> David,
> these people aren't aware they will never be able to sleep after reading your paper..I presented your reality file for some here, after that they unplugged my copy machine....he-he
> Ingemar
>
> -----Original Message-----
> From: Lusby, Jack R. [mailto:[log in to unmask]]
> Sent: den 24 juni 2002 21:32
> To: [log in to unmask]
> Subject: Re: [TN] Cleaning of Military PWAs That Have Been Soldered
> withNo -CleanFlux
>
> David,
>
> I would also like to get a copy of your paper since we have experience
> issues associated with contamination on mil spec CCA's
>
> Thanks,
> Jack Lusby
> Northrop/Grumman ESSS
> [log in to unmask]
> direct (410)552-2886
> fax (410)981-5361
>
> > -----Original Message-----
> > From: Debbie Kenney [SMTP:[log in to unmask]]
> > Sent: Monday, June 24, 2002 2:16 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] Cleaning of Military PWAs That Have Been Soldered
> > withNo -CleanFlux
> >
> > I would also like to get a copy.
> >
> > Debbie Kenney
> > Engineer
> > M-Flex / AMT
> > Direct (714) 688-5242
> > Fax (714) 996-3834
> > [log in to unmask]
> >
> > > -----Original Message-----
> > > From: Gordon F. Davis Jr [SMTP:[log in to unmask]]
> > > Sent: Friday, June 21, 2002 4:30 AM
> > > To: [log in to unmask]
> > > Subject: Re: [TN] Cleaning of Military PWAs That Have Been Soldered
> > > withNo-CleanFlux
> > >
> > > May I get an e-copy of the paper you refered to as well. I also work
> > for
> > > a
> > > military supplier, but we clean everything. I would like to get further
> > > info on no-clean.
> > >
> > > Gordon Davis
> > > Application Engineer
> > > Rockwell Collins
> > >
> > >
> > >
> > >
> > > David Douthit <[log in to unmask]>@ipc.org> on 06/20/2002 09:10:13 PM
> > >
> > > Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please
> > > respond
> > > to David Douthit <[log in to unmask]>
> > >
> > > Sent by: TechNet <[log in to unmask]>
> > >
> > >
> > > To: [log in to unmask]
> > > cc:
> > >
> > > Subject: Re: [TN] Cleaning of Military PWAs That Have Been Soldered
> > > withNo-CleanFlux
> > >
> > >
> > > You have landed in a very nasty area. You are correct to be concerned
> > > about
> > > contamination issues.
> > > Even if the residues from the flux do not create migration/leakage
> > current
> > > problems they may
> > > collect other airborne contaminates that can cause problems.
> > >
> > > Process, shipping, and storage control are critical to the reliability
> > of
> > > the circuitry.
> > >
> > > If you wish I have a paper I presented in May of 2001 titled
> > > "Avionics Systems, Reliability, and Harsh Environments"
> > > that I could e-mail you. The information in the paper will
> > > give you a good idea of what type of airborne contamination
> > > issues you may have to deal with.
> > >
> > > David A. Douthit
> > > Manager
> > > LoCan LLC
> > >
> > > Bogert wrote: 6/20/2002 Folks is anyone manufacturing military PWAs
> > using
> > > no-clean flux and not cleaning the PWAs prior to shipment? If so, what
> > is
> > > your reliability experience with this process? We are considering a
> > > military application (Class 2) where mixed technology (SMT and PTH) PWAs
> > > will be soldered using no-clean flux and then not conformal coated
> > > (assuming the uncoated PWAs can pass our temperature/humidity
> > > qualification
> > > testing). Although the no-clean flux we will use should be benign (we
> > are
> > > having SIR testing performed to confirm this and Omegameter testing), I
> > am
> > > concerned that contamination may be introduced by other shop processes
> > > such
> > > as mechanical assembly, testing, etc., even if one uses gloves or
> > fingere
> > > cots during handling. One could argue that after shipment, since the
> > PWAs
> > > are not conformal coated, you can introduce contamination in the field
> > and
> > > therefore, why not not clean prior to shipment. We may be performing
> > board
> > > testing (boundry scan, bed-of-nails, etc) on PWAs that have been
> > soldered
> > > using no-clean flux. I understand that certain noclean flux can impede
> > > this testing, and also, may cause problems in event we need to conformal
> > > coat the PWAs. Any comments on this subject will be appreciated.
> > >
> > >
> > >
> > >
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