The 2SC4253 transistor is documented in this 303 KB PDF, indexed among schematics. Only the part number is given in the name; maker and revision are not stated. JIS part numbers that start with 2SC refer to NPN high-frequency transistors. Such a datasheet is used to read the pinout, the absolute maximum collector voltage and current, dissipation and hFE classes, and to find a matching substitute. Check the case marking, commonly C4253, against the document before you rely on it.
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.