Covering the 2SC5320, this 124 KB PDF is indexed as a schematic but is almost certainly a datasheet for a single transistor. In Japanese JIS part numbering the 2SC prefix means NPN bipolar. Typical data includes Vceo, Ic, power dissipation, hFE and the physical package with pin order. The file name states no maker or application, so verify the marking. Repair use is straightforward: confirm pinout before removing the part, check readings against expected junction behaviour and pick an equivalent.
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.