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Thread: Need Experienced Help

  1. #1
    Join Date
    Apr 2020
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    Need Experienced Help

    I was in the market for a slightly bigger machine than i have and wanted a good deal on a tig machine. Saw my local CL ad for a syncrowave 351 and wanted to see if anyone knows what the issue could be with this thing? I wouldn't even know where to begin. I'd really appreciate any help. https://reading.craigslist.org/tls/d...101578886.html

  2. #2
    Join Date
    Oct 2014
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    Re: Need Experienced Help

    Don't know if the guy selling it is a welder or just has some used machines. High frequency could have caused damage or could be something simple like the local remote switch is bad. Pretty hard to say what's wrong without doing some tests. Here's an owners manual with a troubleshooting guide that may help.

    https://www.millerwelds.com/files/ow.../O354B_MIL.pdf

  3. #3
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    Jul 2016
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    Re: Need Experienced Help

    My guess would be that because this is a popular and highly thought of machine, He has had it looked at and it is probably too costly to fix. I would love to have it for $500 and find out it was a switch. If I was interested in it I would call a couple welding supply houses with repair staff. They are usually pretty good to bounce questions off of.
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  4. #4
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    Apr 2020
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    Re: Need Experienced Help

    Thank you guys! Iíll read into that manual today.

  5. #5
    Join Date
    Mar 2010
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    Ceres, California
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    Re: Need Experienced Help

    No Hf is a common problem with this welder. Most of the time it is just a small relay that fails on the relay pcb.
    Left side of the welder on the back. Last is checked miller still has a few or you can just replace the small relay. Black box.
    Before you buy it, remove one side panel and look at the polarity switch. see if it is plastic or metal blades.
    The plastic one fails, the all metal seem to last for ever. also look at the filter pcb to the left of the relay pcb.
    Make sure nothing is burnt or damaged on it. The line contactor is turned on by a cable that runs from a push button. Once welder powers up, that contactor stays on until the off button is pressed and the off switch opens, removing power from the contactor coil. Off switch and two small diodes next to the coil must be good for contactor to be able to stay on.
    Relay pcb has a ribbon cable going to it. One large relay in a plastic box and several small relays.
    Check CB1 next the the 115 volt receptacle. If tripped you will have no HF. Contact me by private massage if you need more help.

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