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Posted by Ken Sterling on April 29, 2008, 9:36 pm
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>>On Sun, 27 Apr 2008 14:44:28 -0700, Gunner Asch
>>
>>>I picked up a Lincoln tig 300 square wave machine a couple weeks ago.
<snip>
Gunner.... looks like you're getting some good information, but I feel
it is my moral responsibility to let you know that your efforts will
be futile, and your only recourse is to crate that thing up and send
it to me so I can "dispose" of it properly..... <G>
Ken.
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Posted by Gunner on April 30, 2008, 8:29 am
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On Tue, 29 Apr 2008 21:36:39 -0400, Ken Sterling
>>>On Sun, 27 Apr 2008 14:44:28 -0700, Gunner Asch
>>>
>>>>I picked up a Lincoln tig 300 square wave machine a couple weeks ago.
><snip>
>Gunner.... looks like you're getting some good information, but I feel
>it is my moral responsibility to let you know that your efforts will
>be futile, and your only recourse is to crate that thing up and send
>it to me so I can "dispose" of it properly..... <G>
>Ken.
<G> That stubby little critter is HEAVY. I used the forklift to put
it up on my welding table and tried to shove it into a corner so I
could work on it.
I pushed..and it didnt move. I pushed harder and it moved a
smidge..puckered up the old bung hole and pushed HARD to get it where
i wanted it
Pretty good sized transformer in that critter.
Gunner
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Posted by Jon Elson on April 30, 2008, 1:42 pm
Please log in for more thread options Ken Sterling wrote:
>>>On Sun, 27 Apr 2008 14:44:28 -0700, Gunner Asch
>>>
>>>
>>>>I picked up a Lincoln tig 300 square wave machine a couple weeks ago.
>
> <snip>
> Gunner.... looks like you're getting some good information, but I feel
> it is my moral responsibility to let you know that your efforts will
> be futile, and your only recourse is to crate that thing up and send
> it to me so I can "dispose" of it properly..... <G>
> Ken.
Warning! Stick it on a pallet, and it weighs 840 Lbs. (That
actually includes the wheeled cart and a torch cooler.) At
least that's what mine weighed when shipped. Fortunately, mine
came in excellent shape, and I only had one problem with it, the
post-flow timer would stick on. One replacement capacitor and
it works like a charm. Bad news is that the thing is full of
Tantalum capacitors, which tend to degrade over time, especially
if the unit is unused for a couple years.
But, I sure wouldn't even want to pay the shipping on one of
these if it has serious problems. It has a very complicated
electronic control system that could be real trouble to fix
without factory repair documents. Lincoln will send out the
machine wiring drawing (I think you can download it from their
web site for old models, too) but won't provide info on what is
in the boards themselves. The main board must have 40 CMOS 4000
series chips, and there are 3 or 4 smaller boards, too. Even
with complete schematics it could take sume serious study to
figure out what's wrong.
Jon
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Posted by DoN. Nichols on April 28, 2008, 5:30 pm
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[ ... ]
> I'd have to agree with the majority - the former owner has already
> tried swapping boards, so odds are it's not a board. Bad power SCR or
> Triac in the output sections, bad potentiometer or cabling in the
> controls, bad safety switch, open coupling capacitor, bad
> opto-isolator, etc.
>
> Do a methodical search and you'll find it.
>
> That, and/or make like Jimmy Durante and follow your schnoz - if a
> component has met an electrically violent end, the nose knows. Stuff
> your proboscis in there and take a deep sniff, and track down the
> crispy critter.
Well ... resistors and perhaps caps (depending on the type) will
show up -- including pots.
But SCRs and the like tend to fail in such a way that the smoke
does not really escape, but is rather trapped where it does no good --
and gives no clues to the nose. (Though it may cook the insulation off
the wiring, which you can smell. (If the wiring has Teflon insulation,
you better hope that you *don't* smell it cooking. :-)
And I have seen high voltage silicone insulation get the wire
zapped from inside it without opening at all -- the insulation just
turns limp in certain areas. Not too sure how many welders would be
using that insulation -- it was rather uncommon and expensive when I was
using it at work -- and we were normally routing 45KV with it, a bit
beyond what you would see in the typical welder. :-)
Enjoy,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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