Do you mean "the truth really bites"? No wonder many choose to "know" it.
Hats off, Dave!
Best regards,
jk
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Ingemar Hernefjord
>(EMW)
>Sent: Tuesday, June 25, 2002 3:02 AM
>To: [log in to unmask]
>Subject: Re: [TN] Cleaning of Military PWAs That Have Been Soldered
>withNo -CleanFlux
>
>
>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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