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July 1998

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Subject:
From:
John Waite <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 8 Jul 1998 08:28:18 -0400
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Hello Thomas,
    A lot of how to rework this issue may be dependent upon its cause.  I will offer one suggestion that
may work, dependent upon the severity and root cause. LIGHTLY scrub your boards (by hand) with a
scotchbrite pad and alcohol.  Dry the boards.   Turn your reflow machine on a "standby" temperature and run
your boards through the flux and reflow unit.  The theory is that you will begin activation of the flux,
but the temp is not high enough to bring the solder to its eutectic point.  I have had some limited success
with this technique.   If this does not work, you may have to re-hot air level the parts.  PS>  Check your
solder thickness before and after.   JOHN WAITE

Thomas Jacob wrote:

> Hi Technetters
>
> We have a full rack of rigid polyimide boards with pale, oxidized
> surface onto the HASL-solder pads.
> How can we remove the oxide layer whithout scrapping the boards?
> Is there an economical way to run thru a cleaning machine?
> I don't want to heat up the boards to reflow the solder...
>
> Your help will be highly appreciated
>
> Thomas Jacob
>
> Phone:  0041-1-306 24 07 (direct)
> Fax:    0041-1-306 36 40
> e-mail: [log in to unmask]
> Internet: http://www.dyconex.com
>
> DYCONEX LTD.
> Unterwerkstrasse 3
> CH-8052 Zurich
> Switzerland
>
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