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How to tune a Yamaha electone c40 i

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  • How to tune a Yamaha electone c40 i

    Hello all- I just got this organ (HEAVY!!!) as a gift- the thing is that it’s about 20 cents sharp, a little more on the upper keys. I opened it to look inside thinking I could find how to tune it but I can’t figure it out. Any help?

    Also, there’s a foot long metal piece screwed into the back of the inside of the organ. It has a rubber handle and the tip of it is a little notch - what is this for? The notch is too big to fit any of the pots I saw inside.

    Thanks for all y’alls help

  • #2
    Originally posted by Dzmusic View Post
    Hello all- I just got this organ (HEAVY!!!) as a gift- the thing is that it’s about 20 cents sharp, a little more on the upper keys. I opened it to look inside thinking I could find how to tune it but I can’t figure it out. Any help?

    Also, there’s a foot long metal piece screwed into the back of the inside of the organ. It has a rubber handle and the tip of it is a little notch - what is this for? The notch is too big to fit any of the pots I saw inside.

    Thanks for all y’alls help
    Looking from the front, there is a cage made of metal on the right rear. This is the digital cage. It has three circuit boards inside. The tool you describe is a tool used to help remove these digital boards from their socket.
    The middle board is the main computer board (DM) and it has a small board plugged into it that stands up. That board (M) has a small tuning coil. The tuning coil is usually adjusted with a plastic Hex Tool. It looks like an allen wrench. In the tuning coil, the ferrite core is threaded and when turned, moves up and down changing the pitch of the organ. This core is FRAGILE! Do not use any metal tools with it. Only use a plastic hex tool. Yamaha may have included this tool inside the organ. Worth a look.

    Geo

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    • #3
      Thanks! This worked - it was a flathead notch rather than an Allen wrench though- maybe someone did some mods to it?

      So after putting everything back together I notice that the headphone out distorts sometimes, if there’s too many notes played or if it’s loud - this wasn’t happening before, is there something I can do about this?

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