Re: unsoldering - a bit off topic


Mike Easterbrook
 

I originally thought Chip Quick a bit expensive but in desperation gave in and tried it.   The trick is that you only need very small quantities of the alloy. I've used it with SMD, thru hole and larger items too and still got a lot left a year or more later.  The other advantage of being miserly is that clean-up is much easier.  The liquid flux supplied with the kit is also very effective.

Slightly off-topic - I always found desoldering wick difficult to use - then in a rare moment of brain involvement it occured to me that desoldering had a lot in common with soldering i.e. get the heat in the right place, clean/bright surfaces and plenty of flux.  I don't recall having seen this written anywhere but am sure it's there somewhere.  So a quick polish-up of the wick with steel wool, a drop of liquid flux, nice hot iron and it works like a charm. Oh - all those wasted hours of frustration.  I can almost hear all the chuckling (60 years in the hobby and he didn't know this) anyway better late than never!

Mike 9M2LXM (currently 9V1LX)  

On Mon, Jan 3, 2022 at 11:06 AM M Carroll <mikecn10ec@...> wrote:
Thanks for the excellent tip about slow-solidifying chip removal material! I found Fast Chip and Chip Quick on Amazon. It's not cheap but it can definitely help remove modern pcb components without spending a lot of money on special desoldering equipment that might be seldom used.

W4AEE

On Sun, Jan 2, 2022, 12:09 PM Syd via groups.io <nhuq1=yahoo.com@groups.io> wrote:
Recently I had to solder in a SMA PC mounted connector and then, for some reason, I had to take it out.  Heating up the pads (of a very good heat sink)  and trying to remove it one pin at a time with a screwdriver was no help, neither was using solder wick  or  a solder pump. I recently bought an surface mount solder and unsoldering tutorial kit to learn more about installing and uninstalling surface mounted devices. It came with special solder flux and and something called 'FastChip', a low temperature solder alloy! One can flood all the solder pads and the solder will not solidify for several minutes so one can remove large surface mount ICs with a set of tweezers. So I took out a piece of 'Fast Chip' and flooded the 5 terminals to the SMA connector and all of a sudden the whole thing just fell off the board!  This might come in handy for removing high heat capacity metal items from PC boards without damaging the board!
73
wt1v

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