This comprehensive service manual provides detailed technical information for the Aiwa CSD A100, CSD 99, CSD 110, and CSD 170 Compact Disc Radio and Cassette Recorder models. It covers the inner workings of these units, including the ZZM-1 YR2NF basic tape mechanism and the DA11T3C basic CD mechanism. With step-by-step instructions and clear diagrams, this manual empowers technicians to diagnose and repair common issues, perform maintenance procedures, and understand the complete functionality of these devices.