Doepfer

My appologies if this has been covered before (if so perhaps someone could just post a link).

I have a case with a 230v A-100NT12 power supply. How simple (or complex) would it be to 
have it operate on 115v?  In other words is it a matter of jumpers (and of course proper 
electrical safety precautions)  or a matter of the whole PSU needing to be swapped with a 
115v one ?  

P.S. I already have a voltage converter but I'd rather not use it.

thanks!