A 129 KB PDF identified solely by the JEDEC number 2N6786, listed among schematics. The name gives no device model, board or revision. Documents named after a 2N code are typically component datasheets covering pinout, absolute maximum ratings and mechanical dimensions. Technicians use them to plan in-circuit measurements and to choose a correct substitute. Before replacing anything, confirm the code and package on the real part agree with the data, and do not pick a lower-rated equivalent.
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.