On 7/13/2017 12:31 AM, Eric Smith via cctalk wrote:
There are also vacuum desoldering stations that use "shop air" to derive
the vacuum, rather than having an internal pump. I've never used them as I
don't normally have an air compressor anywhere near my electronics
workbench.
This works very well. The best station for 7400 type IC's was a Weller
vacuum desoldering station.
You had to have the full complement of accessories, and it was important
to have a dryer on the
air. There was a cleaning tool set which allowed you to service the
tips, and replacing them from
time to time was necessary. The technique of clipping off the IC didn't
work that well with this,
as the heat sinked into the chip as you desoldered. If you removed
that, you would potentially
delaminate the PC board, and in the days I used, it, the boards didn't
have that good of thru hole
plating. You could potentially pull the plating out of the hole if you
were not careful / lucky.
I never had any boards with vias connecting to internal laminations, so
that never burned me,
but these days it's a different story.
also being able to heat and apply air to the holes helped and that was
easy with shop air. Not
as good with canned air, if you use that to flush out holes after
pulling ic's
I also have a plastic gizmo that provided vacuum from shop air, but it
was not near as good as
the Weller's integrated unit.
thanks
Jim
