Compact 74.2 KB PDF titled 2sc5161 in lowercase, listed among schematics but almost certainly a single-part datasheet. The 2SC prefix in the Japanese JIS system marks an NPN bipolar transistor of the high-frequency type; the name gives no manufacturer or package. Repair use centres on confirming base, collector and emitter pins, checking maximum voltage and current, and comparing gain with a possible substitute. Verify the marking printed on the component matches before trusting the pinout shown.
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.