Hi, Fred
When I was still fixing early digital RCA projection TV power
supplies, I used paste flux because, when working on a vertical
circuit board, it would hold the transistor in place long enough
to tack one of its little leggies. If I remember correctly, there
were 3 smd transistors that would be popped in the SMPS, and
getting the board into a "face down" position was a bear.
73
Jim W4JED
On 6/15/22 15:51, Fred Spinner wrote:
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Removal of two legged devices?? The easiest way is
with two grounded/ESD soldering irons.? (or hot tweezers but
honestly two irons are easier).? You can get many three legged
devices that way too...one iron gets two leads in that case.?
Once the solder flows grab the device case with the irons or
sweep the device if you can off the board.?
I thought you guys were talking about something
difficult!? :)?
More than that, heat gun and tweezers or low
temp alloys like chip quik.
Always, always, always... when doing smt work,
use a generous amount of quality liquid flux. It's a game
changer.? Trust me.?
Don't panic, once you learn the tricks smt
work and rework can be easier than through lead.
Hardest part for us bifocal guys is to see
what we are doing...
Fred W0FMS?
On Wed, Jun 15, 2022, 12:35 PM
Peter Lascell <
plascell@...>
wrote:
Lots of
good advice, but I think if I needed to remove one or two
surface mount 2 legged parts I would wrap a short piece of
#14 bare, solid copper wire around my iron tip (or remove
the tip and incert the folded end of #14) into the iron,
then with two ends of the #14 making a fork about 3/4"
long and spaced the width of the SMD, I could unsolder
both solder joints at the same time, flipping the componet
away with a tooth pick.
Pete
W4WWQ
More good advice from Colin and JP!
I will let the group know how I make
out with this SMD device removal and if it fixes
the QDX.
--
Pete Lascell
Forest, VA
James Daldry W4JED