162 KB PDF for the 2SB772, a widely used PNP power transistor with a JIS part number, where 2SB stands for a low-frequency PNP device. No manufacturer is named, and it is larger than the UTC sheets for the same type, so it probably comes from another source. It is catalogued as a schematic but documents a single part. Use it to verify pinout, package, ratings and the complementary NPN type, and compare the marking on the board.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)