WARNING: When the Factory Reset Procedure is performed, ALL user-stored data (Registrations, User Styles, Multipads, User Voices, User Songs, MIDI settings, etc.) will be DELETED. If the current settings are not expendable, create a backup before executing the Factory Reset.
1) Make sure that the power is OFF.
Reference: PSR220 Owner's Manual, p. 41
2) While holding the [+] and [-] buttons, turn power ON.
3) When the top of the screen reads "Clr All!", release the [+] and [-] buttons.