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Thread: Pedal board - 4 notes not rersponding

  1. #1
    p Piano KOC62's Avatar
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    Pedal board - 4 notes not rersponding

    On a Johannus OPUS 1100 there are 4 pedal notes, out of 32, not responding. The printed circuit board, at the rear of the organ, holds 8 reed switches for the upper 8 notes. When a rod type magnet is held near a reed switch in turn, all 8 reeds will sound their respective notes, but not when using the pedals. Removing the pedal board shows no apparent problem and all the magnets are in place in each pedal and there is no debris to block proper function. There is no apparent adjustment to position the magnet closer to the reed switch, which is behind a thin baffle board. The pedal board has two pins to hold the pedal board in place. No physical repositioning of the pedal board makes any difference either.

    Any suggestions as what to try next?

  2. #2
    ff Fortissimo arie v's Avatar
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    Hi,

    If I read you correctly, the notes not working with the pedalboard are all at the top of the compass, or at least near the top.

    Unless Johannus changed the pedalboard switching setup, the switch rail is height adjustable. Will need an Allen key to do it. I think there are 3 places where adjustments can be made, near the bottom, middle, and the top. I have forgotten whether the adjustment is done from the back or from the front.

    If the problem is say every 8th note not working, likely a wiring problem.

    Usually the is an explanation, and fairly easy to sort out.

    AV

  3. #3
    p Piano KOC62's Avatar
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    Our reed switches are mounted on a strip of printed circuit board so that each reed switch would align to the center of each pedal width. The pcb is mounted on a sloped plywood form and held with small wood screws. There are no adjustments found, neither on the pedals. Each reed switch sounds a note if a magnetized screwdriver is placed near each reed switch at the pcb.

    Pedals_X.pngReed_sw.jpg

  4. #4
    Moderator myorgan's Avatar
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    Quote Originally Posted by KOC62 View Post
    Our reed switches are mounted on a strip of printed circuit board so that each reed switch would align to the center of each pedal width. The pcb is mounted on a sloped plywood form and held with small wood screws. There are no adjustments found, neither on the pedals. Each reed switch sounds a note if a magnetized screwdriver is placed near each reed switch at the pcb.
    KOC62,

    Have you moved the organ lately? Could you temporarily lift the pedalboard a very slight amount to see if that solves the issue? Alternately, you could raise the corner of the organ a bit (to effectively lower the pedals), you might be able to get sound then.

    I know on my Allen organs, when I lose a caster either off the pedals or the console, just raising one or the other is enough to either make the pedals sound, or not. It was a surprise to me to learn that a pedalboard either too high OR too low can cause the pedal to cipher. When I replaced a couple of broken reed switches on one of my organs I had the time to experiment, and it was enlightening to discover the reed switch could be activated in more than one location.

    Hope you find that helpful.

    Michael
    Way too many organs to list, but I do have 4 Allens:
    • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony)
    • Lowrey Heritage (DSO-1)
    • 9 Pump Organs, 1 Pipe Organ & 4 Pianos

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    p Piano KOC62's Avatar
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    Thanks Michael for your response.
    No, the organ has not been moved recently but I have removed the pedal board to look at it to see if there was any obstruction. It looked clean. There isn't much to the mechanism so I thought I'd ask in case there was something I didn't think of. I have replaced some reed switches which would not respond to a magnet held right on top of the reed switch. Now all the reeds respond with a magnet held about an inch away from the reed switch. Hence I thought that some pedal magnet may have less strength. But there doesn't appear to be any adjustable means to move a pedal magnet closer to the reed switch. Next week I'll have another go at it and see if I can either raise or lower the pedal board somehow.

    Peter.

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    p Piano KOC62's Avatar
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    Not seeing anything resembling an adjustable feature I used another solution for the not-sounding pedals. I bought some 1/4" x 0.1" and 3/8" x 0.1" rare earth magnets from Lee Valley in Ottawa. Placed one on each pedal not sounding. One pedal needed the 3/8" version. Now all the pedals work.

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    Moderator myorgan's Avatar
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    How odd. Had the pedals lost their magnets, or had they lost their magnetism somehow? Hmmm.

    Curious minds, you know.

    Michael
    Way too many organs to list, but I do have 4 Allens:
    • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony)
    • Lowrey Heritage (DSO-1)
    • 9 Pump Organs, 1 Pipe Organ & 4 Pianos

  8. #8
    p Piano KOC62's Avatar
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    All the pedals have a rod-like magnet embedded on the end of each pedal. I don't know how deep the "rod" part is. The pedal ends are relatively flat with no apparent magnet protruding beyond any other magnet. Two pins hold the pedal board in place. The current position causes the organ to rest snuggly on top of the pedal board. I'm new to this aspect of organ repairs.

    The sanctuary floor is a concrete slab, covered with carpet, so there is no sag or "give" to any organ position and pedal board - except what the carpet will allow. It is possible that the organ should be raised slightly in case the pedal board is too high relative to the reed switches. But due to recent construction the organ is moved around somewhat. There is a plan to use the organ for one song this coming Sunday evening for a Reformation Service. So I'm anxious to have it running without shimming, in case they move the organ again. It is not clear if the guest organist will use the pedal board for the one planned song. We have no organist so the organ has been silent for many years. I think a funeral service used it once in the last 10 years.

    The extra magnets hold well on their own and it was a quick solution for the time being. I could remove the pedal board and see if I could mark the optimum magnet position for each reed switch, by using a small single magnet, and then determine where the pedal magnet is actually positioned when pressed. Perhaps this experiment may determine if the organ needs to be raised relative to the pedal board for a final solution.

  9. #9
    Moderator myorgan's Avatar
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    I knew I should have taken photos when I replaced my Pedal reed switches. I'm glad you got something working.

    Michael
    Way too many organs to list, but I do have 4 Allens:
    • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony)
    • Lowrey Heritage (DSO-1)
    • 9 Pump Organs, 1 Pipe Organ & 4 Pianos

  10. #10
    p Piano KOC62's Avatar
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    I did replace some reed switches during an earlier diagnostic. Just using an ohmmeter and a magnet, 4 reed switches won't close no matter how close the magnet was, while the other reed switches worked with the same magnet about an inch away from a reed switch. However, when the pedal board was again installed I still had 5 pedals not responding. The added magnets made it work.

    I also had to repair a speaker cable as it carries audio to 4 speakers mounted high up inside a wall. I believe that each of the 4 channels contains one driver and one 12" driver for bass. I could envisage improvements here to provide a wider bandwidth for each channel. Perhaps a future project if they want to use the organ again.

    This past Sunday the organ was used for two songs for our Reformation Sunday (500th anniversary) and it worked and the guest organist commented that she was pleased I got all the pedals working as she uses pedals. I was a bit nervous whether my repairs would remain reliable enough for the service.

    Peter.

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