The Yamaha PortaSound MP-1 is an epoch-making key-board instrument that features a built-in music score printer and a two-channel memory function. It offers various exciting features including different instrument voices, rhythms, an easy-play Auto Bass Chord system, and the new Duet function.
To operate the device, users must first set up the 3-way power system using internal batteries or optional adaptors for household current or car battery. The manual details how to insert six 1.5V alkaline batteries into the compartment on the bottom of the instrument and explains the procedure for loading the roll paper into the printer.
| Power Source | Internal batteries or optional power adaptors |
|---|---|
| Battery Type | Six 1.5V AM 2, SUM-2, "G" size, R-14, or equivalent alkaline batteries |
| Household Current Adaptor | Power Adaptor PA-4 |
| Car Battery Adaptor | Car Battery Adaptor CA-1 |
It uses six 1.5V AM 2, SUM-2, "G" size, R-14, or equivalent alkaline batteries.
When the internal batteries are weak and need replacing, the Power-on light flashes on and off.
The Power Adaptor PA-4 is available for household current, and the Car Battery Adaptor CA-1 plugs into a car cigarette lighter socket.