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Pedalboard problem (5 replies and 1 comment)
My first post, so I apologise for it being a problem and request for assistance!
A local chapel has a Viscount Jubileum 232 that, due to Covid, has not been played since March. The organist reports that the following keys on the pedalboard do not now work:
7, 8, 9
15, 16, 17
23, 24, 25
31, 32, 1
He advises that he has tried cleaning the contacts, as that is "the usual problem", to no avail.
I am an electronics engineer and (not very good) organist, so he has asked me to investigate. This looks like a cabling or electronics problem to me: exactly 8 keys between each block and 3 per block. Least significant 2 binary bits missing.
I plan to take a look in the next few days. Any pointers gratefully received. A circuit diagram would be especially helpful. Many thanks.
Update: I now have the "schematic" and can see clearly that the problem is lines EDC0/EDC1/EDC7 from the anode sides of the diode multiplexer to CONN6 on the CPU. Once on the CPU board these data lines are commoned with Swell/Great, etc. so as far as I can see it's either a poor connection at the pedalboard or CPU end, or it's the ribbon cable. Anywhere else would present additional faults.
If anyone has any other thoughts on this then I would be glad to hear them.
Hi John, 99% of the time it is a mouse eating the cable. If you need a new cable get in touch as we can supply. Repair of ribbon cables is very difficult.
Hi David, thank you for the reply. I agree that's the most likely reason, especially as the chapel has been left unattended for seven months or so. I'm there tomorrow to take a look and will report back. Good to know you have replacement cables and yes, I agree, IDC terminated ribbon cables are difficult to repair.
Sure enough, it was those dastardly meeces to blame. The expected three wires on the pedalboard ribbon cable were well chewed through and the power cables have also been damaged enough to need replacing. I quickly bridged the broken ribbon cable wires and the organ is now working again so we have a happy organist. A durable repair will require new ribbon and power cables, so I'll be in touch!
Is Australia officially open for visits. I mean if they accept the tourists in connection with the coronavirus pandemic.
I have thought that travelling is restricted to all direction today. But I may be wrong about it. Where to check the official information about travelling possibilities at the moment? I am from the US, watch New York webcam. I am not sure tourists are allowed here.
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