Re: Hand reworking SMT mictors?
- From: nico@xxxxxxxxxxx (Nico Coesel)
- Date: Wed, 11 Oct 2006 16:07:47 GMT
a7yvm109gf5d1@xxxxxxxxxxx wrote:
Hi,
This might be a bit out of place in a design group, so apologies in
advance. This just seems the best place to ask a practical question.
I'd like to replace Samtec QTE connectors manually on a populated
board.
http://www.samtec.com/ftppub/cpdf/QTE-XXX-XX-X-D-XXX-MKT.pdf
The specifics are not important. The general problem is that there is a
long ground pin under the part which needs a solid connection. None of
the rework places want to touch this because I'd need at least a custom
stencil for this. The ground lead must be soldered properly.
I tried approaching solid solder deposit people but they won't touch a
populated board. I tried the polyimide microstencil folks but the
thickness of the stencil means the connector won't seat properly. I
tried convincing the rework people to pop the ground lead out a bit
with a small screwdriver and solder the pin by hand then mash the
connector housing back together later. But "pop" and "mash" are not
accepted terms in this industry, it seems.
I will write-off the boards if I can't replace the connectors but maybe
someone out here has a great idea??
Heat the board gently with a paint stripper (aka heat gun) to remove
the connector, clean the pads using desoldering braid. Apply some
solder to the centre pad (not too much) and some solder flux and
re-heat the board using the paint stripper. Just be carefull not to
over heat (burn) the board. After this, the pins of the connector can
be soldered. I've used this procedure before on devices which hidden
pads.
--
Reply to nico@nctdevpuntnl (punt=.)
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