This comprehensive service manual provides detailed instructions and technical specifications for the Yamaha RX-V2400, RX-V2400RDS, and DSP-AX2400 AV receivers/amplifiers. It also includes information for the RX-V1400, RX-V1400RDS, HTR-5690, and DSP-AX1400 models. The manual is written in English and contains step-by-step instructions, diagrams, and troubleshooting guides to assist technicians in repairing and maintaining these audio components. It covers various aspects of the devices, including circuit diagrams, component identification, testing procedures, and common fault diagnosis. The information provided in this manual will enable skilled individuals to effectively diagnose and repair issues related to these Yamaha AV receivers/amplifiers.