Small 64.5 KB PDF named 2N6764, placed in the schematic category. Only the JEDEC semiconductor code is given, with no model, brand or board details. A file of this size usually holds a brief datasheet: key ratings, electrical characteristics and package outline. It is useful for verifying pinout before measurement, judging whether a component has failed, and choosing a suitable replacement. Compare the physical marking and case of the part on the board with the drawing before swapping.
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.