The 2SC5297 is covered by this 100 KB PDF. The 2SC designation marks a JIS-registered NPN transistor, so the document is most probably the component datasheet despite its schematic label. It would describe pin layout, package dimensions, voltage and current limits and gain figures. Use it when diagnosing a shorted or open transistor or when searching for a cross-reference part. Always confirm the printed marking on the device, since similar numbers can denote very different ratings.
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.