The 119 KB PDF titled 2SC5052 sits in the schematic category, though its name is a JIS part number for an NPN bipolar transistor and the content is most likely a datasheet. No additional details such as brand or package appear in the name. For repair, use it to look up the lead order, collector-emitter voltage, collector current, power dissipation and hFE, and to compare these against any replacement. Confirm the body marking on the board corresponds before relying 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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.