Named 2SC2295_E, this 52 KB PDF is tied to the 2SC2295 NPN transistor, with an _E suffix that the name does not explain. The 2SC prefix follows the JIS standard for NPN types. Listed as a schematic, the file is most likely a datasheet giving characteristics, ratings and the package drawing. Technicians use it to verify pin order and limits before substitution, and to identify the part from its abbreviated body 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)