[sdiy] Error on the SoundBite board!

[PETER K BROWN]

-- Original Message ----
From: Paul Schreiber <synth1 at airmail.net>
To: Synth-DIY <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, February 3, 2008 9:52:46 PM
Subject: Re: [sdiy] Error on the SoundBite board!

> Do you have a good trick for unsoldering 0805s? Or do you have rework 
> tools?
> Just curious; undsoldering SMT packages turns out to be a lot trickier 
> than
> soldering them, in my experience.

Well, I just use a small width Solder Wick and get as much solder as I can 
off each end of the part. Then, I use a pair of needle-nose pliers and twist 
the part off the board. 99% of the time, it just pops off without 
cracking/shattering. The nickel end caps will usually still be stuck to the 
pads, I then use the Solder Wick and essentially wipe the pads with the iron 
pressing down on the Wick. I am not trying to preserve the original 
resistor.

I then use 0.021" no-clean solder and put a *very tiny* bit of solder on one 
of the pcb pads. Using tweezers, I press the part straight down on the pads 
with one hand, the other I just touch the end termination with the iron. 
This is enough to make the part 'stick' on the pads. I then apply a *tiny* 
amount of solder to each end termination.

Paul S.

By far the easiest method is to use two irons, one on each pad.   The part will come right off.   I have been hand soldering SMT boards for over a decade and I can change parts out or re-use them several times without damage using this method.

 With a little practice it is posible to use the surface tension of the solder to prefectly center the part when soldering by using two irons.   Both irons must be removed at exactly the same time.

Peter
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