PDF documentation for the 2SC4252, 302 KB, catalogued in the schematic section. No further information such as manufacturer, package or version is carried by the name. The 2SC prefix in the Japanese JIS scheme identifies an NPN transistor of the high-frequency class. Repair technicians use these sheets to identify terminals, look up voltage and current ceilings and compare characteristics when the original part is obsolete. Verify the marking on the failed component and its package before choosing a 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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.