Covers the 2SD2195, a part whose JIS-style 2SD prefix identifies it as an NPN bipolar transistor rated for low-frequency work. The 67.4 KB PDF is listed under schematics, though its content is probably datasheet material. The name does not mention a manufacturer, package or revision. Repair use is straightforward: verify the pinout before measuring a part in circuit with a multimeter diode test, and compare voltage, current and dissipation limits when a direct replacement is unavailable.
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.