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Has anyone else experienced missing tones after busbar cleaning job? And now I mean tones related to resistance wiring of some individual keys.
I recently serviced -65 A100 which had very weird issue of lost tones in upper manual. After busbar cleaning some years ago (that wasn't me...) there were three or four keys in different octaves that randomly lost percussion/1' drawbar. It occasionally might come back when flipping percussion on/off tab, but after some time they were lost again. Busbar shifting nor hitting key as staccato didn't have any help.
Then I realized that giving a strong thump to organ body somehow affected to it, also lifting and moving the organ couple of inches could lost tones and get them back. What I next found out was that when I grabbed wiring harness going from generator terminal to upper manual terminal and moved it back and forth, those tones went on and off. And finally the upper manual terminal itself was the place where the fault seemed to be located.
In this case I managed to get all tones back alive when carefully pulled upper manual terminal strip towards back of the organ. Other direction they went dead. But the question is, how actually are those bunches of resistance wires connected to terminals, if there is possibility for contact issue with only one wire when other wires from same lug were ok?
It's now very obvious that lifting manuals and therefore bending wiring harnesses for busbar job was causing this, but I guess that this kind of behaviour should not be very common. And what also made troubleshooting a bit misleading was that lost tones of those keys were 1' and 2 2/3', which seemed to be percussion issue at first...
I recently serviced -65 A100 which had very weird issue of lost tones in upper manual. After busbar cleaning some years ago (that wasn't me...) there were three or four keys in different octaves that randomly lost percussion/1' drawbar. It occasionally might come back when flipping percussion on/off tab, but after some time they were lost again. Busbar shifting nor hitting key as staccato didn't have any help.
Then I realized that giving a strong thump to organ body somehow affected to it, also lifting and moving the organ couple of inches could lost tones and get them back. What I next found out was that when I grabbed wiring harness going from generator terminal to upper manual terminal and moved it back and forth, those tones went on and off. And finally the upper manual terminal itself was the place where the fault seemed to be located.
In this case I managed to get all tones back alive when carefully pulled upper manual terminal strip towards back of the organ. Other direction they went dead. But the question is, how actually are those bunches of resistance wires connected to terminals, if there is possibility for contact issue with only one wire when other wires from same lug were ok?
It's now very obvious that lifting manuals and therefore bending wiring harnesses for busbar job was causing this, but I guess that this kind of behaviour should not be very common. And what also made troubleshooting a bit misleading was that lost tones of those keys were 1' and 2 2/3', which seemed to be percussion issue at first...
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