The Yamaha Arius digital piano, an entry-level series, offers the best of both worlds to those that adore the piano. With this series, you get great acoustic piano feel and sound, along with digital recording, headphone jacks, and a variety of voices. The Arius YDP-S31 is Yamaha’s slimline piano – it’s not as big and bulky as the rest of the Arius range. It’s 37cm deep, and an attractive finish, so will look good in the living room.
It is not feature rich, however has good keys and sounds, and a closing lid to protect the keys when not in use. The Yamaha YDP-S31 has 88 keys with 3 pedals. The piano can generate 6 sounds, which is far less than the average for all Upright Digital Piano Digital Pianos and Keyboards. The Yamaha YDP-S31 weights 79 lbs, which is significantly lighter than the average for all Upright Digital Piano Digital Pianos and Keyboards.
Image source: conceptmusic.com.au
To restoring a Yamaha YDPS31 to it’s factory settings, just simply power ON while simultaneously holding the C7 (the highest) key on the keyboard.
Warning! This operation will cause all data, excluding the songs loaded from a computer, will be initialized and reset to the factory default settings. Before you perform this operation, check whether there is any data you want to keep. This procedure also applies to the YDP-S30 unit. Hopefully the article of “Reset Yamaha YDP-S31 Arius Console Piano” can help you.
Reference: Yamaha YDPS31 manual