The 140 KB PDF is identified only by the transistor number 2SC3393 and contains no board or model reference. Following JIS conventions, 2SC means an NPN bipolar part aimed at high-frequency circuits, so this is probably a manufacturer data sheet filed under schematics. Inside you would normally find ratings, characteristic curves and a pin diagram. Use it when checking a shorted junction or selecting a replacement with adequate voltage and current limits, and verify the marking on the original part first.
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.