Reference PDF of 96.5 KB tied to the 2N6237, a JEDEC-numbered discrete semiconductor; the index lists it as a schematic, but it most likely holds the device datasheet. The name gives no maker, revision or package detail. The 2N series is the JEDEC range for two-junction parts, usually transistors, with some thyristors among them. Use the sheet to identify pins and read ratings and limits before testing or substituting, and match the case style shown against the physical component.
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.