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  1. #1
    Join Date
    Jun 2014
    Posts
    2

    Default millermatic 200 woes

    I've had a millermatic 200 serial# jd732347 since new. Good machine till yesterday. I was tack welding and the machine quit.Everything works except for weld power. The fan, feeder, gas sol., all work but does not have weld power. I need my welder working and would like to fix it myself verses haulin it 35 miles.
    Doug

  2. #2
    Join Date
    Mar 2014
    Location
    Texas
    Posts
    53

    Default

    Could be a bunch of different thing on this machine.
    TP3
    S3
    Contactor
    Coil
    Relay
    Just to name a few

  3. #3
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    948

    Default

    Do you hear a clunk, from the contactor when you pull the trigger? Pull the cover, check that, looks at the contacts, clean the selector, check the studs where you connect the cables, they have a tendency to have problems.

  4. #4
    Join Date
    Aug 2007
    Location
    Oklahoma Indian Land
    Posts
    22

    Default

    Check the rectifier bridge. Turn the machine on, set wire speed to (0), with a volt meter check the voltage on the gun wire + to wire - to grd, voltage should read approx 26 volts. If it does not it is most likely the rectifier bridge. Be sure to pull the gun trigger when checking voltage. The bridge is located in the top central portion of the welder with 1 screw in the center and has 4 wires going to it. If you change this do it 1 wire at a time don't get them mixed up..

    See page 41 of MM 200 manual for location..

    Mine blew and it was a bad wire in the gun that caused the problem. FWIW Good luck..
    Last edited by Mangleweld; 06-29-2014 at 09:32 AM.

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