At 275 KB, this PDF for the 2SD2586 is larger than most in the series and may include more detailed characteristic curves or package drawings. It is filed as a schematic, though the 2SD prefix marks an NPN low-frequency bipolar transistor under the JIS system, making a datasheet the likely content. No manufacturer or package is named. Use it to verify pinout and absolute maximum ratings, and to compare gain and saturation figures when selecting an equivalent 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.