Component sheet for the 2N7000BU, 85.2 KB, catalogued as a schematic though it is a datasheet. The BU letters form an ordering suffix, likely a bulk packaging option, while the core 2N7000 is a familiar small-signal N-channel MOSFET. Its size equals the TA variant file, so the two may be the same document. Technicians use it to check pin arrangement, gate threshold and drain current rating, and to compare the body marking with the part removed from a board.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)