Joe,

We have used cans of aerosol with the plastic tube mounted in the spray head
from Chemtronics in the Flux-off Series for applications with tight
clearances. Admittedly this could be expensive but you did say that you do
this operation periodically. You also say that you use liquid RMA flux, I'm
surprised that you haven't burned a board yet with the Air-Vac. We had an
operator that made a mistake and used RMA liquid flux at the Air-Vac only to
have the alcohol component burn the PC board. We use tacky flux exclusively
at the Air-Vac.

Hope this helps.

Bill Kasprzak
Moog Inc. Manufacturing Engineering, Electronics


> -----Original Message-----
> From: Macko, Joe @ IEC [SMTP:[log in to unmask]]
> Sent: Saturday, April 26, 2003 1:57 PM
> To:   [log in to unmask]
> Subject:      [TN] cleaning under BGAs
>
> Fellow Technets,
>
> Periodically, BGAs are reflowed using our AIR-VAC hot air rework station.
> RMA liquid flux is 1st flowed under the BGA prior to reflow and then clean
> afterwards starting with IPA spray followed by an in-line cleaner wash.
> Occasionally, flux residue remains which requires additional cleaning.
>
> I am in need of a creative and operator safe way to either spray/flow warm
> IPA or a mixture of hot saponifier/DI water (from our in-line cleaner)
> under
> BGAs to expedite cleaning.  I do not know of any equipment on the market
> that can be used for this application.
>
> Welcome ALL suggestions and proven methods.  thanks
>
> joe
>
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