Small 56 KB PDF covering the 2SC4626 part, with an _E suffix that possibly marks an English-language version of the original document. Under the Japanese JIS designation, 2SC stands for an NPN transistor aimed at high-frequency work, so this is effectively a component datasheet despite the schematic label. A repair technician would pull pin order, package type and maximum voltage and current values from it when diagnosing a failed stage or sourcing a compatible substitute for a damaged device.
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.