The amp works but unfortunately it can't switch between phono/tuner/aux

The idea is that when you push one the other unselects itself and pops out automatically but they seem stuck. I can manually change which one is selected by opening the unit up so for now I have put it on phono but if you want me to change to aux I can do that.

So you can only use 1 of the 3 ( phono/tuner/aux) as is

I thought if I put it on phono you can still use the 2 tape inputs if you want another input source.