Datasheet-type PDF for the 2SD1145 transistor, 89.8 KB, placed in the schematic category of the index. Under the JIS designation system, a 2SD number belongs to an NPN bipolar transistor for low-frequency work. Use the document to look up the base, collector and emitter positions and the hFE ranking letter, along with the voltage and current limits. Check these against the board before soldering in a new part, since a substitute must match both the ratings and the pin arrangement.
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.