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ADC 4600 Dead Key

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  • ADC 4600 Dead Key

    Hi, I'm new to this Forum, but I'd like to see if I could get a few pointers on repairing a Allen ADC-4600 key that's dead.

  • #2

    Welcome to the Forum. I hope you continue to participate here for a time to come.

    I don't have my ADC manual right handy, but if I recall correctly, the organ has reed switches at the back of each key. If you select a stop and pass a magnet along the reed switches, they should all activate when the magnet passes. If the key is still dead with that test, the reed switch is probably broken. It is rare for reed switches to go bad, but it does happen. Just be sure when you replace it, it is aligned with the other reed switches. Otherwise, the note will actuate either just before or after the other keys.

    Hope that helps solve your problem.


    P.S. If the keyboard is a leaf type action, let us know, and there is a way to solve that as well.
    P.P.S. I've moved this thread to the Electronic Organ Repair Forum so you'll get more views.
    Way too many organs to list, but I do have 5 Allens:
    • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony) / ADC-8000DKC
    • Lowrey Heritage (DSO-1)
    • 11 Pump Organs, 1 Pipe Organ & 7 Pianos


    • #3
      Another thing to check if it has the glass reedswitches. Check to see if the magnet fell off the metal key adjuster that is attached to the back of the wooden keystick.


      • myorgan
        myorgan commented
        Editing a comment
        Good point. I forgot about that possibly happening.


      • you795a
        you795a commented
        Editing a comment
        I thought about that because we had our share of loose magnets on the key adjusters when I worked there.

      • jbird604
        jbird604 commented
        Editing a comment
        I see a loose magnet on a key stick now and then.