This manual covers the Roland HP-300 and HP-400 electronic pianos, known as the Piano Plus 300 and 400. It explains safety notes, power requirements, cleaning, and detailed descriptions of the front and rear panels, including controls for volume, brilliance, tone selection, chorus, tremolo, and MIDI connections.
The document also lists the technical specifications for each model, such as keyboard size, polyphony, effects, power consumption, dimensions, and accessories. Additional options like headphones and pedal switches are described, and the manual provides guidance for proper installation and use.
| Keyboard (HP-300) | 75 keys, 8 voice polyphonic |
|---|---|
| Keyboard (HP-400) | 88 keys, 12 voice polyphonic |
| Effects (HP-400) | CHORUS ON/OFF, TREMOLO ON/OFF, TREMOLO RATE |
| Power Consumption (HP-300) | 40W (100V, 117V) 50W (220V, 240V) |
| Power Consumption (HP-400) | 45W (100V, 117V) 55W (220V, 240V) |
| Dimensions (HP-300) | 1106(W) x 440(D) x 189(H) mm |
| Dimensions (HP-400) | 1293(W) x 440(D) x 189(H) mm |
| Weight (HP-300) | 21.5 kg (47 lb. 6 oz.) |
| Weight (HP-400) | 23.5 kg (51 lb. 13 oz.) |
Connect standard stereo headphones to the Phones jack; the built‑in speaker stops automatically when headphones are plugged in.
The MIDI channel number of the HP‑300/400 is set to 1.
Use the TREMOLO RATE knob; rotating it clockwise quickens the tremolo rate.
Use the power supply shown on the instrument’s name plate and ensure the voltage matches your country’s system.