[Boatanchors] Desoldering Components

[Dave Harmon]

All you guys that think laying a component wire against a solder lug and
'soldering' it should have to repair the hacked KWM-2 that I had to fix the
other day.
I'm still mad about it. 
There were literally dozens of parts that had been removed then tacked back
without removing the old leads or sucking off the old solder.

As far as TEK testing this kind of solder joint....well they didn't have to
follow behind some hambone that replaces components this way.

As far as removing old, wrapped lead components....I use only dental picks,
flush cuts and an old worn out large GC solder sucker bulb.
I was looking around for another one the other day and I can't find the
larger size. The newer much small bulbs look pretty wimpy to me.
As far as the Hakko unit is concerned.....I dunno....sounds like a lot of
money to me.....yeah I know....I'll forget about the money when I use it.

Removing wrapped components definitely is an art but after some practice it
is pretty easy.....it's all in the technique.
I never use solder wick....only the bulb.
And...you have to have to use a large enough soldering iron to get the job
done. 
A 40w iron is not big enough...I use a 60w iron most of the time and it is
just barely enough.
Other leads that are on a ground lug attached to the chassis require a lot
more heat and a larger chisel tip....I have a 120w American Beauty style
iron made by Weller...not a pistol grip.

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of David C. Hallam
Sent: Thursday, May 09, 2013 2:49 PM
To: Jim Haynes
Cc: boatanchors at mailman.qth.net; Al Klase
Subject: Re: [Boatanchors] Desoldering Components

I certainly have considered for those tie points where the hole is not
completely filled with wire just cutting the wires of the old components as
close as possible and heating just enough to push a new component's wire
through.  In the past I have used the quigs or Quikettes as Sprague called
them.  I just can't bring myself to like the looks of them, just like the
orange drop capacitors.

Resistors can generally be tested without loosening an end. Capacitors are
another matter, although the manual I have with my old Solar capacitor
tester gives some kind of a qualitative in-circuit test for capacitors.  I
gather this test requires some kind of test leads that I don't have for the
meter.  I have never been able to get any information about them.

I have read that TEK did some testing the reliability of solder joints and
found that wrapping the wire around the lug did not make any improvement
over just putting the wire through the tie lug hole and soldering.

David
KW4DH

On 5/9/2013 3:20 PM, Jim Haynes wrote:
> Another possibility is to ignore the old dictum that the joint must be 
> mechanically sound before the solder is applied.  Which is the reason 
> component leads are wrapped around the terminal lugs in the first place.
> Just lay the new component lead on the terminal lug while applying the 
> soldering iron, after applying a little fresh solder to the new 
> component leads.  If the component is not massive and subject to 
> vibration the joint will probably last a lifetime.
>
> Jim W6JVE
>
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