Very small at 26.8 KB, this PDF is identified only as 2SC4826, a JIS transistor code in which 2SC marks an NPN type. Catalogued as a schematic, it is far more likely a short datasheet, and the name gives no maker, package or ratings. A technician would open it in a PDF viewer for pin identification and key limits when testing or replacing the part. Given the modest size the sheet may be brief, so confirm the component marking and consult a fuller source if detail is missing.
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.