Specification PDF, roughly 32 KB, for the 2SD667 transistor, listed among schematics but in fact a component datasheet. Following JIS naming, the 2SD prefix marks an NPN device intended for low-frequency circuits. The file is handy for confirming emitter, base and collector pins, checking voltage, current and power limits and comparing gain ranks when a part has failed or must be cross-referenced. No manufacturer appears in the name, so verify the marking and case style on the original part before relying on the figures.
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.