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Issue: Baldwin 630t has several notes playing at higher volume levels

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  • Issue: Baldwin 630t has several notes playing at higher volume levels

    Since picking up my Baldwin 630t I've now played it often enough that all keys are sounding again. It seems many keys simply needed the cleaning produced by their movement during playing. (Great news)
    However, over the past several weeks many of the "E" keys have started sounding at a higher volume than the others. It seems to occur at all volume levels but becomes more pronounced with increased master volume levels. And I do like to play it "pedal to the metal" as it were. Any insights are appreciated. Also, at this point I have not done any physical and/or Deoxit cleaning of internal components.
    This is my first post so pardon my "newbie" knowledge of this site and how it is best utilized.

    The 'Home Organs' section is for entertainment type instruments. As yours is a church organ I've moved the thread to where it may get more views and responses. Andy-Moderator
    Last edited by andyg; 08-25-2015, 12:55 AM.

  • #2
    First: DO NOT spray any contact cleaner on the keyswitches or bussbars.

    Try to isolate the problem by playing one stop at a time, one key at a time. Take notes and report back. Words like "many" and "some" don't help with troubleshooting.
    Does the loud tone move when you use the transposer?

    td
    Servicing electronic organs since 1969.

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    • #3
      Thank you for the reply. I've spent time today working up a report to post. However I want to recheck my findings tomorrow before I send it along. I'll post it as a PDF. Indeed there appear to be some patterns which I'm hoping you'll be able to figure out. Here is a Great Manual sample copied from my report. The "T" is the transposed setting and the higher volume notes are shown.
      [TABLE]
      [TR]
      [TD]Stop
      [/TD]
      [TD]T-6

      Oops - I see this system does not like a pasted Word table. Sorry. I'll post the full attachment tomorrow.
      cp

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      • #4
        Baldwin C630t note volume issue

        Okay. Using only my ears I've attempted to produce a report which indicates where the excessive volume notes are located. It shows some patterns, but not always. Thanks in advance for any insights you can provide as well as other "don't do this" tips. Haven't used the attachment feature before so I've uploaded a PDF version of the report and inserted png images of the two pages within the post. Hope it works.
        cp

        Click image for larger version

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        • #5
          I did a quick look through the service manual and based on your charts it looks like a higher than normal output from the E frequency divider IC. There are also resistors to set a reference voltage on each divider output.
          Tracking this down may require an oscilloscope, service manual, and a knowledge of electronic organ circuitry.

          td
          Servicing electronic organs since 1969.

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          • #6
            Baldwin C630t volume issue

            "The first step is often the hardest" is a phrase which comes to mind. I now have my first targets - locate a service manual and a local, knowledgeable friend with an oscilloscope. In the meantime I'll start learning about frequency dividers. If the issue boils down to just one divider that is great news. I've restored reed organs but this is my first electronic organ. I have two other organs waiting on the sidelines - a 2-manual Conn 611 Cathedral from a "smoker's" house and a 3-manual Conn 650 T2 from a barn. All 3 organs have full pedals.
            Thanks again. My new journey has begun.

            cp

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