I’m having the same issue with my Yamaha PSR-160. If headphones do not work, what are next steps? I’m going to try this first. Try to restart the instrument to the factory settings. [NOTE] This operation may delete the backup settings and data saved in the instrument’s user memory depending on the model. While holding down the white key on the right end (C7), press the standby/on switch to turn on the power to this instrument.