Indexed in the schematic section, this 115 KB PDF is named 2N6346A, a JEDEC 2N-series discrete semiconductor number with an A suffix that usually marks a variant of the base part. No further details are given, so expect a datasheet with terminal layout, package outline and electrical ratings. It helps a technician identify leads, check whether a replacement meets the required limits and avoid confusing the A version with the plain number. Open it in any PDF reader.
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.