Help for a Yamaha DX 7 synth..

[thomastorm]

Hi
i bought a DX 7 synth before some weeks and I made some adjustments and I lost sound.
How can i make a reset or something else?
Someone can help me ?
Thank you

 

[arena slicer]

Google Yamaha Dx 7 factory reset...im sure you'll find something (if you cant find anything come back here)