Datasheet-style PDF, 42.3 KB, for the 2SB790, a PNP transistor named under the Japanese JIS convention in which 2SB indicates a low-frequency PNP device. The catalogue lists it as a schematic, yet the name references a single component only. A repair technician would consult it for pinout, case outline, voltage and current limits and gain classes. The trailing _E in the name is left unexplained. Confirm the body marking, typically B790, against the board before ordering a replacement.
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.