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  1. #1
    Join Date
    May 2014
    Posts
    12

    Default TB 302 (dc only unit) Help!!

    Hello all,
    I just got my used TB 302 DC only unit. It welds great, on the run idle setting it will "idle up" when I strike the ark and will hold the idle up for a few seconds after I am done welding...... NOw If I plug something into the generator side and the unit is in the idle run setting, it will not kick up and produces low power, but if I manually turn it to the run setting it idles up and I have all the power I need, Any suggestions on where to look for what part is in need of repair

    Thanks
    D

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,740

    Default

    Idle pickup toroid has failed and needs to be replaced

  3. #3
    Join Date
    Dec 2010
    Location
    Andover, Ohio
    Posts
    90

    Default

    Welcome to the forum K&D welding.

  4. #4
    Join Date
    May 2014
    Posts
    12

    Default

    Thanks Cruz,
    I will looking in to it,

  5. #5
    Join Date
    May 2014
    Posts
    12

    Default

    Cruz is that the same as a current transducer? Sorry for the slew of questions I am new to fixing. Also finding part numbers seems a bit of a pain, I think the PN is #168829
    thanks again

  6. #6
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,740

    Default

    Yes, CT1

  7. #7
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,214

    Default

    I suggest you check it before just replacing it. CTs can but rarely fail.

    You haven't offered a unit SN but you should have 0VAC at CT1 leads (PC2 RC11 pins 1 & 3) with no auxiliary load and around 3.6VAC with a 100W light bulb load.

    If CT1 checks out then you've got a PC2 board problem.
    MM200 w/spot controller and Spoolmatic 1
    Syncrowave 180 SD
    Bobcat 225G Plus LPG/NG w/14-pin*
    *Homemade Suitcase Wire Feeder
    *HF-251D-1
    *WC-1S & Spoolmatic 1
    PakMaster 100XL
    Marquette "Star Jet" 21-110

  8. #8
    Join Date
    May 2014
    Posts
    12

    Default

    sorry the SN is LH300258Q, I hope its a quick fix, I am ok with just turning it to run and than back to idle run when I don't need full power but I really want the machine to be 100% functional.
    thank again

  9. #9
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,214

    Default

    Use the values I posted previously to check CT1.

    Also check the harness connectors at PC1 (RC21) and PC2 (RC16) for poor/corroded connections.
    MM200 w/spot controller and Spoolmatic 1
    Syncrowave 180 SD
    Bobcat 225G Plus LPG/NG w/14-pin*
    *Homemade Suitcase Wire Feeder
    *HF-251D-1
    *WC-1S & Spoolmatic 1
    PakMaster 100XL
    Marquette "Star Jet" 21-110

  10. #10
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,740

    Default

    You should get 66 ohms on a resistance test
    Last edited by cruizer; 05-14-2014 at 11:12 AM.

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