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Thread: MST300 erratic welding output

  1. 03-16-2018 #1
    78sharpshooter
    78sharpshooter is offline WeldingWeb Apprentice
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    MST300 erratic welding output

    The display doesnt flash and turning the weld level pot doesn't change the output and it seems stuck on 100% welding current. Tried a remote 5k pot and it lowered the output but would randomly go back to 100%. I checked the pot on the panel and it is good. Blew out all the dust before starting it up the first time today. Checked the connections to the PWBs. The amps reading on the front shows "c04" or "c05". I looked at all the caps and nothing seems blown. Wondering if anyone else had this type of problem. Thx


    Powcon MST300
    Powcon 400SMT
    Powcon 300SS
    Powcon 300ST
    Powcon 300SM
    '71 SA200
    '75 SAM400
    '88 SAM650
    XMT350
    MM200
    Linde VI402
    Mig35
    SWM23
    LN25
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  2. 03-23-2018 #2
    78sharpshooter
    78sharpshooter is offline WeldingWeb Apprentice
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    Re: MST300 erratic welding output

    Fixed it. Talked to Eddie and he said it was possibly the hall sensor so $28 for the part from newark, soldered it in, and it works perfectly. HA!
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  3. 03-23-2018 #3
    C. Livingstone
    C. Livingstone is offline WeldingWeb Craftsman
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    Re: MST300 erratic welding output

    Wow,

    Nice save!
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