This comprehensive service manual provides detailed technical repair information for the CASIO BGC/BGF-100 Series, DW-003 Series, PRL-10 Series, and PRT-20/40 Series watches manufactured in 1997. The manual is designed for watchmakers and technicians and offers a wealth of information for rebuilding, repairing, and maintaining these Casio watch models. It covers a wide range of topics, including disassembly and reassembly procedures, troubleshooting guides, electrical diagrams, parts identification, replacement instructions, and detailed descriptions of each component. The manual is organized in a clear and concise manner, making it easy to navigate and find the information you need. Whether you are a seasoned watch repair professional or a hobbyist, this manual is an invaluable resource for anyone working on these specific Casio watch models.