How to Replace the Keys on a Yamaha PSR-330 Piano Keyboard

Unplug and flip the keyboard over.

Remove the 4 inner 25 mm screws using a Phillips screwdriver.

Remove the rest of the 7 mm screws using a Phillips screwdriver.

Carefully remove the back casing with both hands from the bottom.

While holding the back casing, unplug the ribbon cable connecting both front and back casings together.

Set aside the back casing.

Remove both 7 mm Phillips #1 screws from the XR736(C) PCB.

Carefully move the XR736(C) PCB away from the contact pad.

Push down on the black tabs on the contact pad.

Starting from the ends, carefully remove the contact pad by wiggling it out.

Flip over the contact pad.

Using a clean cloth, dust the contact pad and the silicone molds.

Remove the silicone molds and dust the other side of them.

Set them aside.

Remove the 10 mm Phillips #1 screw(s) from the case.

Flip the keys rights-side up.

Remove the 7 mm Phillips #1 screws from the keys together

Remove the keys in sections using both hands.

Clean the area using a clean cloth and/or compressed air.

Using the tabs on the keys, insert them into their respective slots.

Place the set of keys back one at a time.