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  1. #1
    Join Date
    Nov 2009
    Location
    Charlotte NC
    Posts
    68

    Default Cannot Adjust the output of my TB 251..

    I'm using my TB 251, 1999' model, with HF box on a big aluminum job. My TB amps outout is max or near, with no adjustment. The adjustment dial has no effect on the max output. The machine is welding fine on max output but cannot be turned down. The generator 120v works....everything works but I cannot turn down the amp output.......Any advice??
    Miller TrailBlazer 251NT
    Miller HF-250-1
    Miller Maxstar 150slt
    Miller ft peddles and thumb wheels
    Miller MM 212
    Lincoln power mig180c (two of)
    MM 252
    Miller Elite Dig
    Miller Pro-Hobby

  2. #2
    Join Date
    Mar 2014
    Location
    Texas
    Posts
    54

    Default

    Check position of Remote Amperage/Voltage switch S3.
    Check resistance and connections of A/V control R1; R1 is 0 to 1000 ohm
    Check hall device HD1, and replace if necessary.
    Check Field Current Control Board PC2 and connections, and replace if necessary (see Section 8-6 or
    8-8). LED2 and LED3 on PC2 light when PC2 is energized.

  3. #3
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    990

    Default

    Can you adjust it if it is in regular stick mode with no 14 pin connected?

  4. #4
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,741

    Default

    If you still can't figure it out, I kinda need the machines serial #

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