how can i fix the radio of a alfa156 ?

the car was taken in for haeldamige after that the radio dind work any more it go's on but u cant put in the code i'f cheked all the fuses and wiring i think some one have try'd to put in the code but faild more than once can someone help me plz? Its a alfa romio R.D.S type932 no.60621186 and no. on metalbody AL093210160691/ V10160691C