Hello, the Noblex Carina came with 2 circuits, if it is the one that brings silicon transistors, check the output and excitation transistors, which are the most likely to burn before an excess of voltage here I leave a link where they uploaded the https circuit: //www.yoreparo.com/electronica-antigua/preguntas/905256/circuito-noblex-carina the other model I think it had an integrated circuit, which is almost certain to be burned by overvoltage, check what the model is, and comment , Cheers