UTC version of the 2SB772 documentation, a 22.5 KB PDF; UTC very likely stands for Unisonic Technologies. The 2SB772 is a PNP transistor numbered under the Japanese JIS scheme, in which 2SB marks low-frequency PNP types. Although catalogued as a schematic, the file is a component datasheet. It serves for checking the base, collector and emitter positions, package outline and absolute maximum ratings. Confirm that the part on the board and its case style match the sheet before relying on it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.