It also goes for the resoldering as well. It is a good practice to
solder, if the component is a connector, one pad at one end  and one in the
middle, and move in the same direction, or solder every three pads to avoid
over heating  one area too much. The tips specially the extraction tips must
be free of corrosion for faster heat transfer.
        Regards,
        Ramon


> Solder extractors can be notorious for lifting pads if not used properly
> by skilled operators. When an extractor has to be used, you don't want to
> extract the solder from holes right next to each other, one right after
> another. Do one hole, and then go to another hole that is a good distance
> away from the hole you just worked on. This keeps the heat from
> building-up to the point where a pad is easily lifted.
>
> -Steve Gregory-
>
>
>
>
>       Hello Yannick,
>
>       I have found the easiest way to remove a PGA (worked with lots of
> them in the late 80's at Unisys/Burroughs) is with a "mini wave". Sort of
> a tiny wave solder pump with nozzles that form a shape approximating the
> size of the device. Once you've removed the component, the holes need to
> be cleared out using a vacuum solder extractor, then replacement of the
> device performed by hand soldering. Replacement could be performed with
> the "mini wave" but it is very operator dependent.
>
>       Regards,
>
>       Ed Popielarski
>       QTA Machine
>       10 Mc Laren, Ste D
>       Irvine, Ca. 92618
>
>       Phone:949-581-6601
>       Fax: 949-581-2448
>       Cel: 949-337-2578
>
>       WWW.QTA.NET <http://www.qta.net/>
>
>
>
>
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