The 2SC5323 is the only clue in this file name, so treat this 122 KB PDF as a probable transistor datasheet even though it sits in the schematic category. Under JIS rules a 2SC code marks an NPN bipolar device. Expect collector-emitter voltage, collector current, power dissipation and the case outline with lead order. Check the part marking and package on the board before relying on it. Any PDF viewer opens it, and it is handy when sourcing a replacement or confirming which leg is the base.
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.