PDF datasheet of 116 KB for the 2SD600K transistor, placed in the schematic category of the index. The name gives only the part number with its K variant suffix, which should be matched exactly when ordering. JIS numbering uses 2SD for NPN low-frequency bipolar transistors. Repair use centres on confirming pinout, collector-emitter voltage, current and dissipation limits and the package type, then testing the original junctions out of circuit to confirm the fault before replacement.
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.