OBERHEIM SYNTH

Hello group.

I have recently bought an OB-12 and although I know you don't consider 
it a real Oberheim, I would like to ask this question:

Has anybody experienced problems with the arpeggio? Mine seems to be 
out of order. It simply doesn't do anything when I switch it on. I 
know it can be broken, but maybe I just don't understand the functions 
yet...

Please let me know if you have an idea to solve the mystery.

Thanks!

Best wishes,

Ole Jeppesen
Denmark