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OK, let me know what is incomprehensible, and I will translate if at all possible!
And, if you know what parts the dealership found 'no longer available' then I might possibly be able to locate them... it's just a thought.
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Thanks... it seems to be downloading fine now, though it will take a little while.
None yet, to be quite honest.
To remind me, please make a brief response.
I will work on it further this evening (Eastern Time). I hope that's OK.
I regret to say that I have no really good news from my perusal of the service manual.
There is a 'pedal board', but it appears to have only one adjustment on it, for the volume of the damper pedal... the sostenuto pedal (if that's the one you think is not working) has no adjustment.
There appears to be no adjustment for sostenuto... the pedal simply acts while it is depressed, and ceases acting when it is released. That is its function (there's a way to test this, in a test program that the service manual goes through for a bit). If you were expecting it to act like a strings-and-sounding-board piano's pedal, which may prolong notes even after the pedal is released again (unless dampers cut off the note at that point!) well, it isn't supposed to have any delay or prolongation past the time when that (sostenuto) pedal is depressed.
But I'm not sure which of the three pedals you were concerned about - ?
Ah, that's different!
Does the third (damper pedal) not work?
Or does it just have the wrong volume when you step on it?
There is, I think, an adjustment on the pedal board, for that pedal.
My impression, while looking over the service manual, was that the adjustment was for volume.
(Does the sound cut short, once you let go of the pedal?)
Allow me to review what I saw about the third (right-hand-most?) pedal in the service manual...
I confess I don't yet know what to make of that, but it is interesting.
In the Service Manual page 31 shows that there is a 'damper volume adjustment'. Maybe, just maybe, tweaking that might help.
Specifically, that adjustment is on the Pedal VR board.
There's a test procedure that includes that pedal, but it basically just tests whether the pedal switch senses the pedal, and not much else.
Is PEDAL (a setting) ON when the pedal is being used?
The pedal circuit board could be replaced, if we could locate a source for it. That would involve taking the whole 'stand' part off the keyboard part, then disassembling the stand to get at the pedal board. But I suspect that ultimately the pedal board doesn't do more than signal that the pedal(s) is/are depressed, and the fault is not there.
It might be a fault in a major circuit board of some expensiveness, but I'm not even sure of that.
I confess I cannot see what to do. Taking this case to a Yamaha Authorized Service Center might be most wise... but that decision is decidedly up to you.
If I can advise you on any point or option (including the choice of local Y. A. Svc. Centers) let me know.
That would require, as I said, disassembly to the point where the inner workings of the pedal assembly were accessible.
That would involve taking the whole 'stand' part off the keyboard part, then disassembling the stand to get at the pedal board.
The service manual does, by and large, show how to do that... in verbal summary, very summarized:
- set on side
- un-do the connection to the legs of the stand-and-pedals part.
- further disassemble, taking case off the pedal assembly, exposing the potentiometer that adjusts the damper volume.
Turn the damper volume adjustment one way - or the other.
With the pedals still hooked up to the keyboard part, temporarily while disassembled, see if that improves or worsens the problem.
Then turn it the other way if the problem worsens.
After which a repair shop might be able to help.
Note: I am not sure that the adjustment for the pedal volume requires the stand be disassembled... but the service manual does not suggest otherwise.
I suggest that you examine the area to one side of the three pedals, for a round hole, possibly labeled as the damper pedal adjustment, through which the adjustment might be made, making it unnecessary to disassemble the base and the pedal case.