255ext HF Start

[performance]

If you see light through the cover, you have points. Try the above mentioned remedies I gave. Make sure you are directly grounded ( and the torch is actually in the negative and the work clamp/ground is in the positive).

[labmaster02]

If you see light through the cover, you have points. Try the above mentioned remedies I gave. Make sure you are directly grounded ( and the torch is actually in the negative and the work clamp/ground is in the positive).

Here's a picture of the HF board. The small can in front of the blues caps is the blue light. There's aren't any contacts to adjust. Unless they are somewhere else in the welder

[performance]

No, that is the solid state board. Must be a little different than the one I have. The "can" doesn't emit light on my unit. It's metal.

[labmaster02]

It's strange. You wouldn't think it was a light by just looking at it, but it definitely lights up when the pedal is depressed. It kind of looks like a capacitor.

[Rambozo]

That can is a gas discharge tube. Very much like a sealed spark gap. It is typically used for input protection from things like lightning strikes and other over voltage events. Kinda a clever use of it as a point gap for an HF board. Depending on how thick the ceramic can is, the light obviously can shine through it, if thin enough.

[WhitsonMetal]

So is that the "points" or are they elsewhere? Sure seems like a delicate part the way the light flickers through it.

[Rambozo]

It looks like that has replaced the points. Depends on what you mean by delicate. Electrically that thing is as tough as nails. You could blow every chip in the machine and that part would probably survive. Physically it is a sealed ceramic piece, so you could break it with enough force. Mounted inside the machine it would be hard to break, without doing a lot of other damage, first. A lot of ceramics let some light through. It should provide greater consistency, as there are no exposed points that must be set by hand, and are subject to getting bumped around during assembly and in transport.