Rhodes Chroma Polaris

many many thanks for the advice Paul .
I will research, and brush up on my electronics know-how before attempting this .

For anyone with good internal Polaris know-how and free time....::::
The Issue my Polaris is having right now, is that when it is switched on the vast majority of 
panel lights are "lit", buttons "7" , "8" and "9" seem to work but they have the response of 
changing "assignable control" light (of which only one is ever alight) and also the 
"envelope" and "volume envelope" lights . This is very odd, i have previously experienced a 
damaged ribbon which i , at first , successfully repaired . but now seems damaged again .
another odd trait of my current Polaris problem is that by pressing 7,8 or 9 the sound is 
changed, though as i play the keyboard the sound suddenly changes erratically . im 
assuming due to the computer receiving confusing messages from the panel . The sliders 
then have no effect on the sound of the instrument .
I am assuming that there is some kind of problem with the Ribbon, as this is a repeating 
problem for me . and due to this problem most of the switches are active . causing the 
instrument to become "confused" and not respond to the slider changes .
does anyone have any idea what connection/cable break or ribbon damage may cause a 
response like this . In reference to the schematics  how would it be possible for all the 
right panel lights to be in there "on" state at the same time ?
sigh!...ok . i hope i didnt explain that too confusingly . . if anyone could help shed any 
light on this problem id be thankful .

thanks again for the previous info .
long live the polaris group ;)