This comprehensive service manual provides you with the knowledge and resources to repair your CASIO LK-80 ELECTRONIC KEYBOARD from 1999. This manual is the same one used by professional repair shops to diagnose and fix problems with this model. It contains detailed instructions and high-quality images to guide you through the repair process. The manual covers a wide range of topics, including: * **Specifications:** Gain a thorough understanding of the LK-80's technical details and performance characteristics. * **Block Diagram:** Visualize the key components of the keyboard's system and how they interact. * **Circuit Description:** Learn about the electronic circuitry, its operation, and potential troubleshooting areas. * **Adjustment:** Find detailed instructions on adjusting and calibrating the keyboard for optimal performance. * **Printed Circuit Boards:** Explore the layout and components of the various circuit boards within the LK-80. * **Schematic Diagrams:** Study detailed electrical diagrams to help you trace signals and diagnose faults. * **Exploded View:** Visualize the assembly and disassembly of the keyboard by examining its components in a step-by-step way. * **Parts List:** Identify and locate the specific parts you may need to replace during your repair. With this comprehensive information at your fingertips, you can confidently tackle repairs and avoid costly trips to the repair shop.