This service manual provides comprehensive instructions for servicing the Sony MZ-R90 and MZ-R91 portable minidisc recorders. It includes detailed information on general servicing procedures, disassembly instructions, accessing the test mode, electrical adjustments, and troubleshooting guides. The manual also features comprehensive diagrams, exploded views, and a complete electrical parts list. All information is presented in clear and concise English, making it easy for technicians to understand and apply.

The Sony MZ-R90 and MZ-R91 were highly regarded portable minidisc recorders that were released in the late 1990s. These sleek and compact devices offered a revolutionary approach to music recording and playback, captivating audiophiles and everyday listeners alike. The MZ-R90, specifically, was lauded for its superior audio quality and robust feature set, making it a popular choice for both professional and casual use. It boasted a powerful built-in amplifier, enabling clear and crisp sound reproduction even at high volumes. The MZ-R91, meanwhile, was a slightly more budget-friendly option that offered a simpler design and fewer features. Both models incorporated a user-friendly interface, making them easy to navigate and operate, even for those unfamiliar with minidisc technology. The portability of these recorders was a key selling point, allowing users to easily take their music with them wherever they went. The Sony MZ-R90/R91 Service Manual is a comprehensive guide that provides detailed instructions and troubleshooting tips for technicians and repair specialists. The manual covers a wide range of topics, including disassembly procedures, testing methods, electrical adjustments, and component identification. It features detailed diagrams and exploded views that illustrate the internal workings of the devices, making it easier for technicians to locate specific parts and understand their functionalities. The manual also includes a comprehensive electrical parts list, which is essential for ordering replacement components. The use of detailed diagrams, exploded views, and parts lists make the Sony MZ-R90/R91 Service Manual an invaluable resource for anyone involved in the maintenance or repair of these iconic minidisc recorders.