daveb22

Thanks for the advice, i'll give that a go. The working keys are the first octave C0-C1. As I say, they trigger on press and release but then just stick until power cycling.

Hi @IanB, yes the synth operates fine over MIDI. The 3 PCB's are connected by soldered ribbon cables which all looked to be in great condition. There is also a master ribbon that connects the 3 PCB's to the main board. It is soldered at the keybed side but plugs in on the mainboard side. I cleaned and reseated this but didn't help. I suppose it could be a dry joint issue but the connections are a little close for me to start weilding my untrained soldering iron at them! I followed this video for the teardown -

Hi, looking for some advice. I acquired a CZ-1 with a faulty keyboard. The first octave works but triggers on both key down and release and then holds the note continuously. None of the other keys do anything. I removed the keybed and cleaned and reseated all the ribbon connectors and cables but hasn't helped. The synth works fine over midi so i'm assuming it's a component issue on the board. Would anyone happen to have seen this issue and maybe know what would need replacing? Thanks - Dave.