Named simply 2SC4636, this 103 KB PDF documents that Japanese-standard NPN transistor and is most likely its datasheet. The name gives no appliance or board reference. Inside you would expect absolute maximum ratings, DC current gain classes, collector saturation voltage, transition frequency and package dimensions. Use it to identify pins correctly, interpret the marking code and verify that any cross-referenced part handles equal or higher voltage, current and dissipation in the circuit.
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.