Yamaha P515 Dead Keys

Synth Repair
1

I’ve been trying to repair a Yamaha P515 that has a cluster of 6 dead keys, all grouped together in a neat cluster. At first, I suspected a failure on the key contact board, since the P515 splits the keybed into three separate boards: High, Mid, and Low, and those divided into sections of key contacts. The affected keys were all located in that section on the high board. (It was all the keys in said section), so I ordered a replacement and swapped it out. Unfortunately, the issue still persists.

I’ve ruled out the rubber contacts. I tested by swapping around the old and replacing with new ones.
I’ve also ruled out connector issue between High and Mid Boards

Now I do not know what to do next…

2

Sometimes, one of the boards on keyboards has the scanning chip. It could be this that’s at fault since it scans keys in groups and one faulty line can drop out a set of keys.

Looking at the photos of the Syntaur replacement boards, I can see that the middle board has a chip on it whilst the top and lower do not. Perhaps Syntaur can swap with extra cash for the middle board?

Did you get hold of the service manual? This should help you isolate the problem.

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