A 105 KB PDF covering the 2SC4426, filed as a schematic although the name is a component number. In JIS terms 2SC signals an NPN bipolar transistor, so expect a datasheet with electrical specifications and outline drawing. When a repair involves a damaged transistor, this kind of sheet lets you confirm lead order, power dissipation and voltage ratings before soldering in a substitute. The name gives no brand or revision information, so cross-check the printed marking and package on the board.
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.