Everlast 140st issue
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  1. #1
    Join Date
    May 2015
    Location
    Barre Town, VT
    Posts
    861

    Everlast 140st issue

    After many hours of trouble free welding my little 140st seems to have developed an issue. When it is plugged into 240v and I turn it on the amperage display briefly displays the set amperage an the fan starts up. Then display flickers off and displays 000 and continues to flicker with the power and warning LEDs lit. On 120v the display just stays 000 and doesn't flicker.

    It seems to be a control issue because it never went bang or smoked like they tend to do when a filter cap or IGBT gives up the ghost.

    Anybody know if there is a schematic for this welder or am I going to have to make it up as I go along?
    My "collection":

    Homemade Stick Welder
    Victor O/A Torch
    AC 225
    Ideal Arc 250

    HF 90 Amp Flux Core
    HF Mig 170
    Solar 2020 Plasma Cutter
    Power i-Mig 140E
    Harris O/A torch
    HF Dual Mig 131
    140ST
    Alpha Tig 200x

  2. #2
    Join Date
    Nov 2008
    Location
    south GA where its hot in summer and cold in winter
    Posts
    4,766

    Re: Everlast 140st issue

    Just call tech support. 877 755 9353 ext 207. Easiest way (and best) way to get help. 9 to 5 Eastern.
    Esab Migmaster 250
    Lincoln SA 200
    Lincoln Ranger 8
    Smith Oxy Fuel setup
    Everlast PowerPlasma 80
    Everlast Power iMIG 160
    Everlast Power iMIG 205
    Everlast Power iMIG 140E
    Everlast PowerARC 300
    Everlast PowerARC 140ST
    Everlast PowerTIG 255EXT

  3. #3
    Join Date
    May 2015
    Location
    Barre Town, VT
    Posts
    861

    Re: Everlast 140st issue

    Quote Originally Posted by lugweld View Post
    Just call tech support. 877 755 9353 ext 207. Easiest way (and best) way to get help. 9 to 5 Eastern.
    Thanks, I'll call them tomorrow. If it's set up like a typical switch mode power supply I'd say this smacks of an issue with the power supply to the oscillator board.
    My "collection":

    Homemade Stick Welder
    Victor O/A Torch
    AC 225
    Ideal Arc 250

    HF 90 Amp Flux Core
    HF Mig 170
    Solar 2020 Plasma Cutter
    Power i-Mig 140E
    Harris O/A torch
    HF Dual Mig 131
    140ST
    Alpha Tig 200x

  4. #4
    Join Date
    May 2015
    Location
    Barre Town, VT
    Posts
    861

    Re: Everlast 140st issue

    Well I fixed it. It had a burnt out 12v regulator near the top of the welder. It's a standard L7812CV regulator which I happen to have a drawer of. I added a small computer fan to keep it cool and added a metal handle to take the place of the less than useful shoulder strap. I'm taking a page out of Mister Tig's book and calling this new and improved welder the IP140. It came from the factory as a good little welder now it is a great little welder.

    Here's the video of me fixing the thing and adding the fan plus handle.
    My "collection":

    Homemade Stick Welder
    Victor O/A Torch
    AC 225
    Ideal Arc 250

    HF 90 Amp Flux Core
    HF Mig 170
    Solar 2020 Plasma Cutter
    Power i-Mig 140E
    Harris O/A torch
    HF Dual Mig 131
    140ST
    Alpha Tig 200x

  5. #5
    Join Date
    Dec 2015
    Posts
    1,398

    Re: Everlast 140st issue

    Hey,

    I scrubbed through the video, whicle catching some points, even though I hardly know my way around a multi-meter.

    But you've obviously got some mad electronics troubleshooting skills, dude!

  6. #6
    Join Date
    Mar 2018
    Location
    SE Massachusetts
    Posts
    43

    Re: Everlast 140st issue

    Excellent troubleshooting, video and repair! Great idea to add additional cooling on the voltage regulator too.. The Everlast welder appears to be well made.. What's your opinion on build design and quality aside from this one flaw?

  7. #7
    Join Date
    May 2015
    Location
    Barre Town, VT
    Posts
    861

    Re: Everlast 140st issue

    Quote Originally Posted by Raybonz View Post
    Excellent troubleshooting, video and repair! Great idea to add additional cooling on the voltage regulator too.. The Everlast welder appears to be well made.. What's your opinion on build design and quality aside from this one flaw?
    Thanks! Their build quality seems top notch and all of the components are brand name. If you are really interested in how it works just look up "half bridge converter" in google because that's what this is designed around. It's a text book inverter circuit. I'd buy other Everlast welders.
    Last edited by Iain P; 03-14-2018 at 09:59 PM.
    My "collection":

    Homemade Stick Welder
    Victor O/A Torch
    AC 225
    Ideal Arc 250

    HF 90 Amp Flux Core
    HF Mig 170
    Solar 2020 Plasma Cutter
    Power i-Mig 140E
    Harris O/A torch
    HF Dual Mig 131
    140ST
    Alpha Tig 200x

  8. #8

    Re: Everlast 140st issue

    I am an interested lurker in these forums but registered for the specific purpose of complimenting you on this thread and your troubleshooting video. Outstanding.

  9. #9
    Join Date
    May 2015
    Location
    Barre Town, VT
    Posts
    861

    Re: Everlast 140st issue

    Well it’s been 8 months since the rebuild and it has been working flawlessly. Today me and a coworker were welding on a bridge joint and wanted to run two welders without having to drag two engine drives to the job so I brought in the 140st and ran it off the Miller Trailblazer’s 240v output while my coworker welded with the Trailblazer. We were burning 1/8 7018 at 125 and both machines were handling it fine!

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    My "collection":

    Homemade Stick Welder
    Victor O/A Torch
    AC 225
    Ideal Arc 250

    HF 90 Amp Flux Core
    HF Mig 170
    Solar 2020 Plasma Cutter
    Power i-Mig 140E
    Harris O/A torch
    HF Dual Mig 131
    140ST
    Alpha Tig 200x

  10. #10
    Join Date
    Nov 2008
    Location
    south GA where its hot in summer and cold in winter
    Posts
    4,766

    Re: Everlast 140st issue

    That's just so neat.
    Esab Migmaster 250
    Lincoln SA 200
    Lincoln Ranger 8
    Smith Oxy Fuel setup
    Everlast PowerPlasma 80
    Everlast Power iMIG 160
    Everlast Power iMIG 205
    Everlast Power iMIG 140E
    Everlast PowerARC 300
    Everlast PowerARC 140ST
    Everlast PowerTIG 255EXT

  11. #11

    Re: Everlast 140st issue

    Iain. I tinker in electronics. Your explanation of how that circuit works was excellent. Thank You!

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