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Miller XMT 300 troubleshooting

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    cruizer
    Senior Member

  • cruizer
    replied
    These are dangerous machines to both troubleshoot and successfully repair. I still stand back when I turn it on. I would stop throwing parts at it. Just not worth the time, effort and substantial $$. For the limited return

    Leave a comment:

  • H80N
    Senior Member

  • H80N
    replied
    Originally posted by Adam Mc Laughlin View Post
    Hi Everyone

    Trying to repair an XMT 300 that had belonged to an old family member.
    This is not the unit that is auto-link, it is the 240 V edition.

    When I first opened it I found that the LEM board had a burst electrolytic, so I got a replacement LEM board from Miller. Installed it and replaced the bad switch on the upper left hand side, middle row. That switch was crunchy so I ordered and installed a replacement one. Switch alone was $66 - for a switch!

    Anyway, problem now is that while the unit turns on and powers up it does not strike an arc or indicate anything on the LED display -
    anyone tackled this before? Any recommendations as to what to do next?

    I took electronics certificate program at the local community college a few years back, I don't mind diving in but was hoping that all of you might have a suggestion as to where I should start.

    Adam
    First PLS post your serial number ... that way the correct schematics and docs can be looked up....

    If I recall some old threads correctly... that unit has some unique troubleshooting challenges....and that Cruizer has lot of experience with them...

    Hope he checks in on this one............

    Leave a comment:

  • Aeronca41
    Senior Member

  • Aeronca41
    replied
    Welcome, Adam. I know nothing about your welder but there are those here who do. Hope you get an answer.

    Leave a comment:

  • Adam Mc Laughlin
    Junior Member

  • Adam Mc Laughlin
    started a topic Miller XMT 300 troubleshooting

    Miller XMT 300 troubleshooting

    Hi Everyone

    Trying to repair an XMT 300 that had belonged to an old family member.
    This is not the unit that is auto-link, it is the 240 V edition.

    When I first opened it I found that the LEM board had a burst electrolytic, so I got a replacement LEM board from Miller. Installed it and replaced the bad switch on the upper left hand side, middle row. That switch was crunchy so I ordered and installed a replacement one. Switch alone was $66 - for a switch!

    Anyway, problem now is that while the unit turns on and powers up it does not strike an arc or indicate anything on the LED display -
    anyone tackled this before? Any recommendations as to what to do next?

    I took electronics certificate program at the local community college a few years back, I don't mind diving in but was hoping that all of you might have a suggestion as to where I should start.

    Adam
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