A 133 KB PDF for the 2SD1935, a transistor in the Japanese 2SD family, which the JIS standard reserves for NPN low-frequency devices. Expect a datasheet rather than a circuit diagram, despite the schematic category. Repair use centres on reading the collector-emitter and collector-base limits, the maximum collector current and the pinout when you need to verify or substitute a shorted part. The name carries only the part number. Confirm the full marking on the case, which commonly drops the 2S prefix, before trusting the match.
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.