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Attn: CRUIZER! Millermatic 175 dead (Power to welder-No fan-No Gas-No Arc)

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  • #16
    Okay thanks! I checked the two traces resistance that I fixed and found no problems after, but before the fix they showed no connection. I will follow the other traces with the multimeter and see if I cant find something else.

    Originally posted by Miller Kevin View Post
    The 2 black leads are fed from the control board, RC1 pins 1 and 5. If the switch is good the only other thing that could interupt the power is an open trace on the board itself.

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    • #17
      Okay so checked the voltage to the fan...
      - First black wire to ground is 120v.
      - Second black wire to ground is 120v.
      - Zero across the two black but I expect that is normal as they are both positive. Correct?
      - Checked the fan resistance again and got 45.6 ohm across black and 5.4 ohm across white.

      So if the fan gets 230v why dies it still not function? I assume the two white wires power the fan? Thoughts from here?

      Originally posted by blue devil View Post
      Okay thanks! I checked the two traces resistance that I fixed and found no problems after, but before the fix they showed no connection. I will follow the other traces with the multimeter and see if I cant find something else.

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      • #18
        OK, we don't test to ground (chassis) generally and not in this case....

        Black to black (thats the fan circuit), power switch on should be 230vac

        White to white ( control voltage) power switch on must be 24Vac

        There are NO positive/ neg circuits in AC Voltage
        Last edited by cruizer; 03-28-2013, 05:49 PM.

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        • #19
          On your traces you fried, make sure that RC1-1 goes to RC1-4 and RC3-12

          And RC1-5 goes throgh to RC3-7

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