PDF reference sheet of 59.1 KB for the 2N3702, a transistor from the JEDEC 2N numbering series, catalogued under schematics. The file name offers nothing beyond the part number. Repair technicians consult it to confirm pinout, polarity and limiting values before swapping a part, or to find a suitable equivalent when the original is unavailable. It opens in any PDF viewer; compare the printed marking and package of the board component with the drawing before trusting the lead assignment.
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.