A 150 KB PDF indexed as a schematic, named only after the JEDEC part number 2N6806. The name gives no device, board or package detail. A 2N prefix marks a registered discrete semiconductor, so the content is most likely a component datasheet rather than a board diagram. Technicians use such sheets to check pinout, voltage and current ratings and the case outline before fitting a replacement. Compare the markings on the faulty part with the document, and confirm the ratings meet or exceed the original.
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.