I have a Kurzwiel PC 1X piano. The left keys (bass) do not sound. After checking, it turns out that the damage is not to the keys but to the PCB board. I have attached a photo. My question is, are there any cheap ones for sale, or are there any PCB boards for sale? How can I get one? Thank you.
I think you can test the left side by inserting the bass cable into the treble cables position and if the keyboards bass side activates the treble side that will verify that either the bass contact board damage or the main board is defective. If I remember correctly swapping those cables which are passive will only switch the treble side to the bass side and visa versa. Only attempt if you are confident in do so though.