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Allen MOS-1 Presets problem

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  • Allen MOS-1 Presets problem

    Hello, i have a little problem with my Allen 120-C MOS-1 organ: when i turn my organ, is a number 1, or 4 or 8 (!) of preset activated,without that
    i have the presets activated. What can be the problem? Bad caps in the power supply?
    Regards Chris
    Last edited by praestant; 10-26-2015, 02:05 AM.

  • #2
    Does the cancel piston work? Do the pistons work properly?

    Check the -5 volt power supply for correct voltage and no AC ripple.
    Check the 2 mfd capacitor on the preset board.

    td
    Servicing electronic organs since 1969.

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    • #3
      Hi td, yes the cancel piston work.
      The caps was replaced.

      chris

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