P-105 with dead keys

Synth Repair
1

I have a Yamaha P-105 with some dead keys - they bottom three D keys, the bottom two A flat keys and the C in the sixth octave.

I’ve cleaned the contacts (‘the internet’ indicated that might be a solution for such a problem) - didn’t work. I tried switching around the rubber contact strips to see if they were the problem - the same keys are dead, so I concluded they weren’t.

Have replaced the contact board for the lower section (certain that would fix it :slightly_frowning_face:) and no change…

Anyone have any ideas? Only thing left I can think of is the main board - but I think that would be prohibitively expensive :shushing_face:

2

This is probably a middle board problem due to corrosion . It’s best to replace all 3 boards as long as you have the unit open. Yamaha recommends changing the rubber too, but in my experience when this issue occurs changing the rubbers isn’t really necessary.

1 Like
3

Cool, thanks. I’ll give that a try (if I can get hold of them!)

4

I know, right?? Backorders are a bitch.

5

So I replaced lower, middle and upper boards - which fixed all the keys in the lower registers, but now I’ve lost the C#s and G’s in my top two octaves…

Any ideas?

6

Sounds like one of those pesky cables are either not seated correctly or when you reattached one you bent one of the pins……