Tom:
                There is a solution kit that when dropped on the surface of a board containing flux will change the color of the flux  to blue.  I am not able to find it at this time. Perhaps someone in the forum knows.
        Regards,
        Ramon


-----Original Message-----
From: Tom Gervascio [mailto:[log in to unmask]]
Sent: Thursday, May 20, 2004 10:29 AM
To: [log in to unmask]
Subject: Re: [TN] Cleaning test boards


Thanks good idea. I've gone so far as adding flourescent agents (without effecting the paste and flux)  to the paste and flux to improve detection.

Tom Gervascio
Senior Process Engineer
Sparton Electronics
(352) 540-4040

>>> [log in to unmask] 05/20/04 08:48AM >>>
        Hi Tom:
                  Just and idea, how about gluing all the components on one corner only. Do not use solder paste and deball the BGAs. Or perhaps the  BGAs can be set up with stand offs and glued on just on corner and not be deballed. Spray the board with flux, run it through the reflow oven and clean it. Break off the glue and check under parts and between  leads.
        Good luck
        Ramon

-----Original Message-----
From: Tom Gervascio [mailto:[log in to unmask]]
Sent: Thursday, May 20, 2004 8:30 AM
To: [log in to unmask]
Subject: [TN] Cleaning test boards


I am looking for an "off the shelf" test board and components that could be used for evaluating the effectiveness of cleaning process.

 In the past, I've ordered dummy boards with mixtures of microBGA, Pin Grid Arrays, Quad Flat Packs and SMT connectors representing parts for which we have had cleaning problems. Sometimes I've tried to bond glass slides and cover plates to quickly look at the ability to get under different standoff height versus package size (yes I realize this has different surface energies than actual parts- but it's a tradeoff of actually trying to remove soldered parts to look under them for ionic and visual residues).  But his is difficult and time consuming to get the boards and parts and I was trying to get ideas. Also this doesn't include test patterns to check for electromigration or S&IR effects.

Are there any standard test vehicles or designs that people have developed and be willing to share?

Thanks



Tom Gervascio
Senior Process Engineer
Sparton Electronics
(352) 540-4040

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