Named 2SC5069 and weighing 107 KB, this PDF is catalogued under schematics but represents a JIS-numbered NPN bipolar transistor, so treat it as a datasheet. Nothing besides the part number is stated in the name. Typical use is confirming which pin is base, collector and emitter, reading voltage and current limits and checking gain grouping before swapping the part. Since SMD transistors are marked with short codes, cross-check the marking against the document before trusting it for a repair.
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.