Vintage Synth Repair

Dirty key contacts?

--- In vintagesynthrepair@yahoogroups.com, "synthiaks2004" 
<synthiaks2004@y...> wrote:
> 
> Dear All
>  
>  Any body can give me a help. My Minimoog had some problem on the
>  keyboard. Actually it got some problem only on the particular keys.
>  When I press the problems key it can not stay at a pitch. It will
>  floating . Just like to use the LFO to control the Osc Freq. It 
only
>  had 4 keys had this problem. But when I use midi to control the
>  minimoog(yes my minimoog had install midi). It had no problems. Any
>  body can ask me Why? How can i repair it?
>  
>  Bird