The smaller 77.9 KB PDF here carries the type number 2SC4449, indexed as a schematic but almost certainly a component datasheet. JIS numbering uses 2SC for NPN bipolar transistors aimed at high-frequency circuits. The name lists no maker, package or grade. Read the sheet for terminal layout, absolute maximum ratings and gain ranges, which help when measuring a suspected failed transistor and when choosing a replacement whose voltage and frequency ratings are equal or better.
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.