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Stanton STR8-100 running fast.

Discussion in 'Electronic Repair' started by Odrec, May 11, 2007.

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  1. Odrec

    Odrec Guest

    I recently acquired two Stanton STR8*100 turntables but one of them
    has begun to have problems. When I press Start it goes to flyaway
    speed instantly regardless of where the speed selection button is
    (33/45/78). I can reach the correct speed by slowing it down with my
    fingers but if I use the Pitch Slider, Pitch Bend, Pitch Select or any
    speed change it just goes back to flyaway speed. If I use the reverse
    button I get any of two reactions, it either stops totally or goes to
    flyaway speed.

    Another thing, when I press the Stop button it does not stop
    immendiately like it should but acts as motor kill.

    Thanks for any help you might give me...

  2. Often runaway speed means the loss of a FG tach pulse, such as from a
    magnetic or optical speed sensing device. Sometimes even a dirty control or
    switch can cause this.

    In this case however, I'm thinking bad solder connections or maybe a bad
    drive IC. Seems to me that if the FG were missing the braking would still

    Mark Z.
  3. Franc Zabkar

    Franc Zabkar Guest

    I'm not familiar with your t/t, but it sounds like it has a servo
    problem, possibly a lack of rotational feedback ???

    Before doing any serious troubleshooting, I'd squirt all the pots and
    switches with cleaning solvent/lubricant.

    FWIW, the instruction manual is here:

    - Franc Zabkar
  4. Odrec

    Odrec Guest

    Nuck from replied:

    Odrec, the input to the speed control is open, there is a wire missing
    from the 3 wire connection between control and motor. Search the wire
    back from the control board, one is voltage supply, one is reference,
    one is signal.

    I am gonna give it a try.
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