A 146 KB PDF with the JEDEC part number 2N6766 as its only identifier, catalogued as a schematic. Nothing in the name ties it to a particular device or board revision. Such files are normally manufacturer datasheets with electrical tables and an outline drawing. A technician refers to them to locate pins for diode or resistance checks and to evaluate equivalents. Confirm that the part code and package printed on the component match before relying on any figure in the sheet.
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.