Shop Master 300 issue

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I have a Miller Shop Master 300 that wont weld when the switch is turned to DC straight polarity It works fine in AC and DC Reverse Should I take it to the repair shop or is it a simple contact problem
Reply:I changed the title to your thread to better fit your question, so hopefully one of the members who is familiar with machines will note it easier and reply. Not all of them visit every day, so it may take a day or two before they get a chance to chime in..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Take a side off and look inside as you change the switch to see if it's moving the blades when the switch is rotating into the DC straight position. It is probably just the handle slipping.
Reply:What is the unit SN?I'm not familiar with any Shop Master 300 that has DC a polarity selection switch only AC/CC/CV with the associated and appropriate weld output studs.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:Originally Posted by duaneb55What is the unit SN?I'm not familiar with any Shop Master 300 that has DC a polarity selection switch only AC/CC/CV with the associated and appropriate weld output studs.