One of the few times in life that size really does matter
Mike Bryce, WB8VGE
the heathkit shop
SunLight energy systems
J e e p
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On Oct 16, 2013, at 5:07 PM, Richards wrote:
>
>
> 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.
>
> _______________________________________
>
>
> 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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