Thermal Arc 130/150/190 gts repair

  1. thompo New Member

    Messages:
    2
    Location:
    Belfast
    Hi folks,

    New on here looking to learn a bit about tig welding.

    I've picked up a thermal arc 190 gts but it's in need of some love. Fan comes on nothing else and it's got some interesting wiring inside. I think it's taken a hit or been dropped and someone has messed up trying to repair.

    Is anyone here running one of these models?

    I've followed the service manual and everything tests good but I have found a resistor is missing. Would anyone be willing to take a photo of their pcb for me or even just the value of resistor?

    it's R202 I need just behind the main mcb when you take the cover off. Should similar maybe even identical to R201 (white tower block shaped thing) in the attached picture

    thanks Neil
     
    • 2016-05-09 07.22.31.jpg
  2. ostosix New Member

    Messages:
    4
    Location:
    Lincoln
    Hi did you get this sorted? I have one of these
     
  3. chris pruteanu Member

    Messages:
    856
    Location:
    ROMANIA
    Probably he got rid of it or he managed to fix it, the post is from 2016...many things have changed under the sun in this time...
     
  4. ostosix New Member

    Messages:
    4
    Location:
    Lincoln
    Hi yes i am aware when it from, just following might be sat in his shed
     
    chris pruteanu likes this.
  5. Richard.

    Richard. Forum Supporter

    Messages:
    18,347
    Location:
    Cambridgeshire
    Old threads can quite easily be bought back into life. It is very annoying to see a thread started up with a technical question but then no update on how things progressed. Makes the thread absolutely useless.

    In this particular case you’ve got no chance of a reply
    Member has only ever posted once and was last seen in 2016.
     
    • 7B59D193-4B6B-4D92-9A0C-A9891A700C28.jpeg
    ostosix and eLuSiVeMiTe like this.
  6. thompo New Member

    Messages:
    2
    Location:
    Belfast
    Just seen this lol.
    Still have the machine, unfixed in my shed.
    For reference R202 is the same as R201 100ohm 7W.
    Sanrex USA suggested that if PHC 101/102 were gone it was likely an indepth repair and a new PCB would be more cost effective.
    Unfortunately i have no way to verify if these are working.
     
  7. eddie49 Member

    Assuming these components are on the main power board of the inverter, it should be fairly easy to trace the layout of the circuit around the suspect components and the ones close to them. This can be done by identifying the components and visually tracing the PCB tracks, then making a sketch. Easier said than done, of course, but in this case the components are large, generic, high-power stuff. D101 is a bridge rectifier, R201 and R202 are wire-wound 100 Ohm resistors, the sleeved component is probably a metal-oxide Varistor, there's a bunch of 1500uF smoothing capacitors nearby. The wires that were originally connected to the screw-terminals, such as TB7, should be traceable to their source.
    Sanrex USA may be right, other parts of the machine could be at fault, but this localised area should be fixable.
     
  8. Paul Brown New Member

    Messages:
    5
    Location:
    Uk
    Hi guys I have just acquired a 190 gts I'm new to welding I have set machine up but can't get hf start to work I have to touch the work piece to get an arc I have tried torch with a button and foot pedal. The plug on the torch only has 2 prongs and the foot pedal has 7 could this be the problem? Sorry if it's a stupid question like i say just new to this.
    Paul.
     
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