In de handleiding op pagina 49 wordt het beschreven
You can erase the backup parameter settings described above, and then restore all the default factory settings. The instrument can be initialized with the following two methods.
Backup Clear This operation initializes the backup parameters. While holding down the highest white key, press the [ ] (Standby/On) switch to turn the power on.
Flash Clear This operation deletes all the Songs and Styles that have been transferred from a computer. Note that Style data loaded to Style numbers 221–230 will be maintained. While simultaneously holding the highest white key and the three highest black keys, press the [ ] (Standby/On) switch to turn the power on