The sustain pedal of my Clavinova CLP 120 doesn't work anymore... after "only" 13 years!

Let's have a look and repair it

Supplies

Philips screwdriver

Step 1: Tilt Your Piano

Tilt your piano and remove the dust!!

Then use your screw driver to remove the 8 screws (4 are only reachable through holes in the plate)

remove 2 little black screws to withdraw the pedal itself

the switch is a "Rubber Contact Membrane" or "Carbon Tactile Keys" or "rubber-coated switch"
FYI a comprehensive study here : http://www.comdes.nl/PDF/GTC/Keypad-Design-Guide.p...

solution 1/ I swapped the grey switch from the middle pedal to the sustain pedal: It didn't solve my problem... but maybe yours?

solution 2/ I simply added a corrugated board between the pedal and the switch! It works again!

solution 3/ you could try to re-paste the conductive circuit with a silver conductive glue

Beware that cheap conductive glue has low amount of silver (if any) and won't really work

here the official documentation from Yamaha, it could be helpful

We cannot accept that our piano pedal may malfunctionning... imagine the danger, if you have a piano-car