The 2SC4630 is documented in this 95.5 KB PDF, which the index labels a schematic although the name points to a datasheet. The 2SC prefix identifies an NPN bipolar transistor in the Japanese JIS scheme. An LS-suffixed companion document is also available for comparison. Practical uses include reading off the pin order for in-circuit diode tests, checking gain and voltage ratings, and confirming package size. Verify the marking on the actual component before relying on these figures.
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.