Keys at every OTHER octave not working-JX-10

Synth Repair
1

I got a jX-10; It seems that certain keys do not work at every OTHER octave.

So, for example, c3 is dead, c4 is good, c5 is dead, c6 is good…

This happens for a couple of different notes.

I have reseated all the cables underneath or related to the keybed, no love. I"m not very technical, just 'not afraid" to try stuff… Can anyone help me?

3

I am quite sure that this is not each second octave only but simply every eighth key (which results of course for certain keys in every second octave). Check with a scope at CN5 whether there are digital signals on the lines T0 to T7

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