Philips Philicorda GM760 - Percussion and separate keyboards

[xfce]

Hi,

I am starting my journey with Philips Philicorda GM760.
For a moment 2 things are not working:

1. Percussion - there is no sound from any pedal - when all 3 keys of percussion are off - there is loud buzz.
2. If SK23 is in the second position, both keyboards are connected in parallel and only in this position 2 keyboards play. But when I switch it to position 1 top keyboard do not give any sound. Manipulating R446 do not give any result.

I have looked for instruction - but have found only in Dutch:
https://elektrotanya.com/philips_phi...wnload.html#dl
Also I am not sure how to open top part to have a look inside.
Under keyboard there were 2 connectors - One of them on right side previous owner de-mounted - inside I can see few cables cut and mostly modified recently - but I am not sure if it can impact any functions.

Any help is warmly welcomed & thank you a lot in advance 🙂

 

[xfce]

Hi,


One more thing is that few black keys have exactly the same sound like white keys.
I am wondering if it is something that can be quite easily fixed?
The same issue is always - no matter which sound i will choose.