The 2SD2201 is the subject of this 153 KB PDF, indexed as a schematic though the content is presumably a datasheet. JIS numbering assigns 2SD to NPN bipolar transistors designed for low-frequency circuits. For repair work, the useful parts are the pinout drawing, breakdown voltages, maximum collector current and gain groups, which guide in-circuit checks and part substitution. Check the device marking and package against the sheet first.
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.
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