OBERHEIM SYNTH

Ok i visited a friend yesterday and he has received an OB8 that is in
bad shape. 

When you turn it on it plays ok for some seconds and then it starts
sounding like burned (bitcrushed basically/horrible).

When i tried to press the autotune button the first four lights
lighted but the rest blinked.

it is going to service obviously but can anyone harbor what could be
the problem (what the blinking on autotune means ? in the manual it
says voices are from that point onwards ignored but what can make them
not pass the autotune test..?)

Thanks 

Theodore.