Larger 185 KB PDF for the 2SD2012, written in lowercase in the name and placed among schematics. JIS designation 2SD identifies an NPN bipolar transistor intended for low-frequency or power circuits. The sheet probably includes rating tables, curves and package drawings, though the name gives no detail. Use it to confirm terminal order, read limits for voltage, current and dissipation and decide whether a substitute is suitable. Check the printed marking against the part number before relying on it.
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.