Datasheet-type PDF of 47.9 KB for the 2SD894, placed under schematics. The name holds only the part number, which follows JIS conventions where 2SD indicates an NPN low-frequency bipolar transistor. On the bench it helps identify base, collector and emitter before measuring junctions with a meter, and it gives the ratings needed to vet a cross-referenced substitute. Check the marking and case style of the original part so the document and the component actually correspond.
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.