Yamaha Piano pedal mechanism

Sylvia Else · 2009-08-26T04:12:42+00:00

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.

Aug 26, 2009 41 Replies

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Bob Larter 16 years ago

A column of resistive wotchamajiggits that get compressed when you push the pedal, like sewing machines.

W . | ,. w , "Some people are alive only because \\|/ \\|/ it is illegal to kill them." Perna condita delenda est ---^----^---------------------------------------------------------------

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Sylvia Else 16 years ago

I just today received the new pot.

It's an odd device. Over most of its range the resistance doesn't vary. All the change occurs within quite a small angle. This makes a kind of sense, given that the pedal mechanism doesn't rotate it far. But it seems to imply that the pots were specially made, which can't have helped to keep the price down.

Sylvia.

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