Yamaha Dx7 keyboard Repair help

[hardtronics]

I have a Yamaha DX7, probably the first model, and my middle c keeps sustaining when ever its touched or anything near it is touched. Does any one know how to fix this problem. It looks like the spring is broken or somwthing.

 

[Mako321]

New spring?

 

[ttsgeb]

Try lifting up on the key when it starts sustaining. If that fixes it, get a new spring. If not, check for shorts in the keyboard matrix, maybe check if the isolation diodes are bad or something... Doesn't sound like it's ghosting, but you never know...