This comprehensive repair manual provides detailed instructions and schematics for servicing and repairing the CASIO AP-20 electronic keyboard. It covers a wide range of topics, including troubleshooting common issues, disassembling and reassembling the keyboard, understanding its electrical and mechanical components, and performing necessary repairs. Whether you are a seasoned technician or a DIY enthusiast, this manual will equip you with the knowledge and guidance needed to restore your CASIO AP-20 to its optimal functionality.