On 10/16/2013 2:25 AM, Ken Brown wrote:
You want to get in, melt the solder, and wick it away quickly, and get
out before you cause a lot of damage.
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Amen, Bruddah.
Hard Lesson No 92874.
I learned that the hard way when replacing a faulty IC that came in my
TT Model 1254 receiver kit. TT sent me a replacement chip saying they
had a lot of lousy chips, so that part was easy - but I used too small a
conical tip, and heated the board too long removing the old part,
damaging a couple of the solder pads.
I am lucky because a really good friend who builds prototype boards for
exotic experimental weapon systems sorta owed me a favor from something
I helped him with... systems. He reworked the board, and fixed the
damage as a return favor. Next time, I suppose it will cost me a
bottle of really good bourbon! And that can get real expensive!
But everything said in his thread reminds me of what he told me.
I guess one of the take-away points is: MASS - it is all about mass and
a large enough tip will have enough mass to pass a lot of heat quickly.
I thought a smaller tip would mean I was confining the heat to a small,
concentrated area - wrong - there was not enough heat to do the job
quickly - so the the board suffered.
Lesson learned.
----------------- K8JHR -------------------
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