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Kenwood KR-V126R - Need Help ID'ing Impedance Switch Polarity

Discussion in 'Electronic Repair' started by Tim, Apr 3, 2007.

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  1. Tim

    Tim Guest

    My problem is that I need to know which side is less than 8 or which
    side is 8 or more. Kinda dumb I know, but I had to twist the lines
    around to get at the switch, and now I am not sure which is which. One
    side has yellow wires and the other has white. When the switch is moved
    to one side it shorts those lines to ground thru a set of green wires.

    The wires themselves go back to the power transformer (the yellow and
    white ones). The green ones go to the main power board and to ground.


    - Tim -
  2. Tim

    Tim Guest

    In addition I would like to verify the the regulator id'ed as IC12 on
    the main board is supposed to be a 78M15. there has been work on this
    area and it seems to be sensitive to the problem I am trying to solve. I
    subbed in a 78M12 with a 1200 resistor on the ground to get 15.2 V, but
    the receiver got very noisy.

    - Tim -
  3. Tim Schwartz

    Tim Schwartz Guest


    In general, the 8 ohm position will be the one with higher voltage from
    the transformer. All you need to do is measure the voltage on the
    output of the switch, and see which position has the higher voltage on
    the green wires, which you've described as the output from the switch to
    the rectifier.

    PLEASE NOTE: I'm assuming that your description here is accurate, and
    that is not other wiring to the main power supply.

    Tim Schwartz
    Bristol Electronics
  4. Tim

    Tim Guest

    OK I measured across the green set, and one position has 90-95 and the
    other 120-125, The reading fluctuates a fair amount, but there is
    definatly one higher side, so I'll assume that's the 8 ohm or higher

    Thanks for the lesson,

    - Tim -
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