On Mon, 24 Nov 2008 10:28:13 +0000, f825_677
wrote:

Arfa Daily wrote:

As Graham says, but be aware that unless you are a *very* experienced
solderer, and posess the right desoldering equipment, you will struggle to
do the job. These are some of the very worst bitches to get out of a board,
that you will *ever* come across. And then some.


You should try a Sony 1602 or 1601 IC from one of their broadcast mixer
boards - it can take an hour if you're lucky and all day if you're not
and we have professionaly desoldering vacumme equipment - the holes are
barely larger than the pin its self every engineer working on these
things in every broadcast engineering department complaints about these
devices.. Give me a 100 pin BGA device any day..


Desoldering a through hole part on a multi-layer PCB can be difficult,
especially if the part in question or the PCB is sinking all of your
solder tip heat away.

I have two good solutions. First one is to pre-heat the entire PCB
assembly to about 160F. That will keep the heat from sinking away so
much.

You can also heat the local area with a heat gun. This works even
better with the pre-heated PCB. The soldering operations generally take
place without a hitch in these cases.