Another dialarc question

[kevin4578]

Just a quick question i found my slide resistor(R3) was bad on my dialarc 250 hf so I bought a new one but what or how do I set this resistor to. The serial number is JE742058. I figured it would be set from factory but apparently it's not. It's the last piece of the puzzle to get the hf start finally...

[kevin4578]

Okay thanks for the insight it's been very helpful!...

[kevin4578]

Also what would be a decent price for a used machine like this used. It's ready to go with coolmate 1 cooler foot pedal and torch. Don't know the hours on it yet. Just looking for a ballpark what these are going for. I'm basically looking for something to use around the garage that takes up less space...

[kevin4578]

Thanks guy's for the info is there any thing in particular that goes on these to be aware of or are they all seem to be solid except for the few odd exceptions

[kevin4578]

Seller is unable to tell me much about this welder all i have is the serial # ma180633l. will this number tell me what model and year this unit is?

[kevin4578]

Thanks bud for the brake down it really helps when you know how everything functions. Hopefully tonight I'll have time to work on it. Do you know what the voltage is supposed to be coming out of the center terminal of the slide resistor (wire 47). After going through the schematic this has to be where...

[kevin4578]

Ok have some good news and some bad the good is i got the post flow gas working turns out the nob probably got smacked hard and broke the connections at the board so i re soldered now working, the bad is i replace the bridge rectifier and double checked the 47 wire but the cr1 relay still isn't pulling...

[kevin4578]

Ok will check #47 wire when I get home. I checked the rc1 relay by removing from welder and putting 12 volts to it, coil pulled in so figured it is fine. When I had that relay out I installed another relay that has the same rating as the original. New relay didn't pull in either. I'll also see if i...

[kevin4578]

Ok thanks I actually did do a visual check on that it has a couple capacitors tied in there aswell. I didn't notice any broken or disconnect wires there but now that I know this is the part cruizer was referring to I'll look into it a little deeper. What's the best way to test this part, should I disconnect...

[kevin4578]

Hey cruizer not sure what you mean by the small bridge sorry for the stupid question but could you let me know what you're referring to. Also i checked all over and the only loose or bad connection is one of the terminals on the rheostat that I still need to fixThanks Kevin

[kevin4578]

And switched to remote

[kevin4578]

A bud of mine had a good relay that is basically the same as the original that's in the welder so I swapped them with the same result. I then tested the two incoming lines that fire the coil. With switch on hf start there isn't any voltage at the leads with the pedal pressed or depressed. When i switch...

[kevin4578]

Ok so the cr1 relay is good but don't have power to it

[kevin4578]

Well just started tearing into this machine now and found the cr1 relay isn't pulling in I also found the end wire if the 150 watt rheostat ( part number 083671) stake on connection had come appart. What would that connection cause the welder to do? It's the high end wire of the rheostat.

[kevin4578]

Fair enough cruser thanks very much for your help it's a great starting point, hopefully I can start to tear into it over the weekend!