Small 42.8 KB PDF for the 2SC2188, carrying an _E suffix in its name and filed under schematics. Japanese JIS numbering assigns the 2SC prefix to NPN bipolar transistors, so this is best treated as a component datasheet rather than a board diagram. Repair work uses such sheets to identify terminals, confirm absolute maximum ratings and choose an equivalent when the original is unavailable. The name states no manufacturer, so compare the logo and marking on the actual part with the sheet.
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.