Despite sitting in the schematic category, this 99.9 KB PDF is named after the 2SC4164 and should therefore contain transistor specifications rather than a circuit diagram. In JIS designations, 2SC stands for an NPN bipolar transistor, typically printed on the case as C4164. A technician checks such a sheet for collector, base and emitter positions, absolute maximum ratings and hFE ranges when diagnosing a shorted or open junction or choosing a replacement. Verify the package and any gain suffix on the original before substituting.
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.