Hi, Lawrence

> I found there was a lot of solder balls left on the board, and I had to
> mechanically remove them quite vigorously.  Underneath was a good solder
> joint.  I tried a toothbrush, which would not touch it, then the end of a
> needle, which scraped it off pretty well.  I finally just got out a fine
> wire brush and removed the stuff wholesale.  This is never a problem with
> a hand soldering iron.
>
> Do other people have to remove this stuff after reflow?  Does it seem to
> take a vigorous amount of work?  I would have a hard time applying less
> solder, using a syringe, I just touch the pad, don't squeeze any on at
> all.  I added extra flux to the board, and I am using a combo solder, RMA
> flux.  It has 2% silver content, which might make it a little higher
> temperature solder.

    The solder balls are the result of using too much solder paste ! If you
use the right amount of paste you will have a clena board at the end. I also
prefer no clean solder paste and no extra flux. If you control the
temperature right you will get almost perfect boards.

Best regards,
Alexandre Guimaraes

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