PDF file of roughly 104 KB identified only by the part number 2SC4424. Under the Japanese JIS numbering scheme, 2SC parts are NPN bipolar transistors, so the document most likely lists that device's characteristics, package and pin arrangement. It serves technicians who need to verify a replacement against the original ratings or locate the correct leg for measurements. The name says nothing about the maker or a board application, so check the code printed on the component before relying on this sheet.
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.