The 2SD2624 is described in this small PDF of 30.0 KB, indexed under schematics, though a part number like this generally indicates a datasheet. Within JIS numbering, 2SD stands for an NPN low-frequency bipolar transistor. Technicians check the terminal layout, voltage and current limits and gain range here before replacing a faulty unit. Match the code printed on the body, often shortened to D2624, and confirm the case style before ordering.
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)