This comprehensive service manual provides detailed technical information for Toshiba Colour TV models 51H83, 57H83, and 65H83. It covers a range of essential service procedures, enabling technicians to effectively diagnose and repair these television sets. The manual includes instructions on general adjustments, safety precautions, CRT assembly replacement and mounting, picture tube component adjustment, CRT replacement, and access to the service mode. Furthermore, it delves into electrical adjustments, chassis adjustments, and provides schematics and diagrams to facilitate understanding.