"Engineer" wrote in message
...
On Aug 26, 12:12 am, Sylvia Else wrote:
The sustaining pedal on my Yamaha electronic piano is become rather
flaky. Sometimes it doesn't sustain when pressed.

So I disassembled the piano enough to get at the mechanism, (removed 12
screws, and 6 bolts), and was rather surprised to see that the business
end consists of a potentiometre.

I'm not really surprised that it's failing. In fact, the surprise is
that it's lasted so long. When a piano is played, the sustaining pedal
is in constant use. I can't help feeling potentiometres were never
designed with that kind of use in mind.

The design seems rather primitive.

Sylvia.

I have three pedals on my General Music PRO-1 keyboard. Two are are
KORG brand and the other is something else but the same design. I
took one apart a few year ago to clean and, IIRC, it was a compression
design. They work perfectly, don't fail and I only paid about $25
each.
Cheers,
Roger

You got me there. What's a 'compression' design ?

Arfa