PDF covering the 2SD1880, about 88.9 KB, listed as a schematic but named after a single semiconductor part. Under JIS rules a 2SD code belongs to an NPN bipolar transistor for low-frequency applications, commonly found in amplifier, driver and regulator sections of older consumer gear. Use the document to verify base, collector and emitter positions and the absolute maximum ratings before fitting an equivalent. Compare the package type too, because a substitute with different pin order will not drop in.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.