Supposing that your deck does not have a backside switch to select voltage, it is very difficult to adapt the deck for higher voltages.
Usually it requires a transformer replacement. That alone could be easy if you know the output voltage of the transformer. You just have to find one that has the same output voltage under new 220V input voltage. It
has to be capable to supply the required intensity as well, but a deck doesn't require much ampers.
The problem is that several models have transformers with more than one output line. It has several output voltages and it's practically impossible to find one suitable.
Guess what is your case and comment us.
If you are on the second case, you will have to get a 120/220 External Transformer/ Adapter.