Part data for the 2SD1805, supplied as a 96.5 KB PDF and categorised as a schematic. The name states nothing beyond the type number. Following the JIS convention, 2SD covers NPN bipolar transistors for low-frequency circuits. The sheet helps confirm the pinout before in-circuit measurements, provides voltage, current and power limits for judging substitutes, and shows the package outline for footprint checks. Open it with a standard PDF reader and verify the code on the original device before ordering a replacement.
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.