Home › Forums › Vintage EHX › 1978 Small Stone works fine on power supply but not on battery…

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  • August 2, 2012 at 3:58 pm #82498
    billbo
    Participant

    Hello,

    I have a 1978 Small Stone wersion J that works fine on power supply but doesn’t work on a battery.

    I checked all the obvious things, i.e. battery snap, dirty jacks, connections and everything seems to be good. The switching 1/4″ input jack as well as the power supply jack are functioning as they should. Seems to have 9 volts at the input from the battery too. And no, I’m not checking it in battery mode with a pwer supply connected.

    With a battery connected, it passes (low) signal in effect and bypass modes. You can hear the effect a bit in the background, but not on the signal.

    As I said, the pedal works perfectly with a pwer supply connecteted. Frustrating because this seems like it should be a totally simple fix, yet I can’t figure it out. Could it be a bad component on the board?

    Thanks so much for any help with this matter,

    Bill

    August 2, 2012 at 4:03 pm #117959
    The EH Man
    Moderator

    Is the battery connector backward?

    August 2, 2012 at 4:05 pm #117960
    The EH Man
    Moderator

    Might be the 47 ohm resistor on the board in the +9 line.

    August 2, 2012 at 4:32 pm #117961
    billbo
    Participant

    The battery connector’s not backwards. It appeared to have never been disturbed when I got this, but I did try revering it anyway, nope, that’s not it. Red from the snap is connectected to the tip of the power jack, the black wire to the ring of the input jack.

    Thanks for the tip about the resistor. Where would that be on the board and what are the stripe colors? (I’m not really a tech, but trust myself with small repairs) Is that a componnent that is likely to fail?

    Thanks!

    August 2, 2012 at 4:35 pm #117962
    The EH Man
    Moderator

    it would be right where the red lead goes to the board. Yellow, Violet, Black

    August 2, 2012 at 4:41 pm #117963
    billbo
    Participant

    No red wires go directly to the board…the only red wires are from the snap and 2 others going from the input to the footswitch. All the other wires from the input and power jacks are white on this ‘Stone.

    Thanks…

    August 2, 2012 at 4:43 pm #117964
    The EH Man
    Moderator

    The power wire from the DC jack.

    August 2, 2012 at 4:45 pm #117965
    billbo
    Participant

    I think I see the resistor in question, Y/Blk/V. It’s on the upper left hand corner of the board near the input jack. Would jumping a new one in work to test it or do I have to remove the old one first?

    Thanks

    August 2, 2012 at 4:48 pm #117966
    The EH Man
    Moderator

    just try jumping it with a piece of wire.

    August 2, 2012 at 4:51 pm #117967
    billbo
    Participant

    Power wire from the DC jack is white on this one. That’s the resistor I think you mean, but it’s vilet black brown, looks like.

    August 2, 2012 at 4:57 pm #117968
    billbo
    Participant

    I jumped it, no difference.

    August 2, 2012 at 5:47 pm #117969
    The EH Man
    Moderator

    Do you have a multimeter?

    August 2, 2012 at 6:17 pm #117970
    billbo
    Participant

    yes i have a multimeter

    August 2, 2012 at 6:19 pm #117971
    The EH Man
    Moderator

    Check for +9vdc at both ends of the resistor.

    August 2, 2012 at 6:32 pm #117972
    billbo
    Participant

    I get .3** and the last 2 digits won’t settle down.

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