This document describes the precautions for using an external power adapter, connecting the power supply, and using external speakers.
This manual covers everything you need to get started with the Yamaha DGX-640 digital piano, including assembly of the keyboard stand, power‑up procedures, and an overview of its Graded Hammer Standard Keyboard and performance‑assistant features. It also explains how to use the built‑in voices, styles, and music notation display.
Safety and maintenance information is detailed throughout, with warnings about proper power‑adapter use, battery handling, and environmental disposal. The document includes FCC compliance notes, warranty information, and a full list of accessories that come with the instrument.
| Equipment Type | Digital Piano |
|---|---|
| Model | DGX-640 |
| Battery lifespan | Approximately five years |
Do not place the product where anyone could walk on, trip over, or roll over power or connecting cords, and avoid using extension cords whenever possible.
Only use the voltage and adapter specified on the name plate or in the manual; using a different adapter can cause damage or overheating.
Do not disassemble or incinerate the battery; keep it away from children and follow local regulations for battery disposal.
Yes, the instrument complies with Part 15 of the FCC Rules for Class B digital devices.