This document is the user manual for Yamaha electronic keyboard KB-290/291, which introduces the features and operation methods of the keyboard.
This manual provides detailed instructions for using the Yamaha KB-290/291 electronic keyboard, including how to connect accessories, adjust settings, use built-in effects, record and play music, and handle safety precautions. It also covers USB connectivity, data transfer, and troubleshooting. The guide is written in Chinese with English product names and technical terms.
You must immediately turn off the power, unplug the AC power cord, and have a qualified Yamaha service person inspect the equipment.