PDF named 2SD951, filed as a schematic but in all likelihood the datasheet for this 2SD-series NPN bipolar transistor; at 267 KB it may include scanned pages or extra curves. The name holds no voltage, current or package information. Use it to look up ratings and pin layout when troubleshooting an output or driver stage, test the suspect transistor with a meter, and confirm that any cross-reference replacement meets or exceeds the original limits.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)