Vintage Synth Repair

--- In vintagesynthrepair@yahoogroups.com, "synthiaks2004" <synthiaks2004@...> 
wrote:
>
> I just got a Arp 2600 MK III with 3620 Keyboard. But the keyboard doesn't work. It can 
> sound but every time the key will get different pitch even I only press the same key 
again 
> and again. Do you know what problem was that?
>

My first guess is that the contacts need to be cleaned, but it could be more than that.