Sorry, since the mixer is powered by a "wall wart" adapter, it is UNLIKELY there are fuses in the unit.
If it is inoperative, then check the voltage of your power adapter. If you by chance connected a wrong adapter, try the correct one. It is possible damage was done in this case that is not so easily fixed as changing a fuse. The correct adapter looks to be a type AC14 which LOOKS to be a 15 volt DC, 500 ma, with negative on the pin.
Answers & Comments
Sorry, since the mixer is powered by a "wall wart" adapter, it is UNLIKELY there are fuses in the unit.
If it is inoperative, then check the voltage of your power adapter. If you by chance connected a wrong adapter, try the correct one. It is possible damage was done in this case that is not so easily fixed as changing a fuse. The correct adapter looks to be a type AC14 which LOOKS to be a 15 volt DC, 500 ma, with negative on the pin.