A 92.1 KB PDF labelled 2SC4106 and placed among the schematics. The name carries no model or board number, only the part designation; in the Japanese JIS/JEITA system the 2SC prefix indicates an NPN bipolar transistor for high-frequency use, so the content is most likely its datasheet. Use it to verify pin assignment, voltage and current limits and dissipation before fitting a replacement or cross-referencing to another manufacturer. Any standard PDF reader will display it.
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.