A comparatively large 707 KB PDF filed as a schematic, named only 2N6427, a JEDEC 2N-series discrete semiconductor number. The size suggests a full datasheet with characteristic graphs, test circuits and package drawings, though the name gives no further detail. Repair technicians use such a sheet to confirm pinout before replacement, compare in-circuit readings with expected behaviour and find suitable substitutes. Check that the case style and marking shown match the device fitted on your board before ordering parts.
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.