The name of this 160 KB PDF gives only 2SC5738, and the index files it under schematics. Japanese 2SC designations belong to NPN bipolar transistors, so a component datasheet is the likely content rather than a circuit diagram. Technicians reference such sheets for pin configuration, maximum collector voltage and current, dissipation and gain, which guide testing and substitution decisions. Open it with any PDF reader and compare the outline drawing and marking with the transistor on the PCB.
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.