This Owner's Manual describes how to operate and care for the Yamaha PortaTone PSR-21 electronic keyboard. The instrument features a built-in digital synthesizer and a rich variety of sounds. To achieve optimum playing enjoyment, users are advised to operate the PSR-21 while reading through the manual.
| Power Source (Batteries) | six 1.5V SUM-1, "D" size, R-20, or equivalent alkaline batteries |
|---|---|
| Power Adaptor Model | PA-4 |
| Car Battery Adaptor Model | CA-1 |
The instrument requires six 1.5V SUM-1, "D" size, R-20, or equivalent alkaline batteries.
Only the Model PA-4 power adaptor is usable for household current.
Insert the ends of the music rest firmly into the two holes at the back of the instrument and lower the plastic plate so it rests on the keyboard.