PDF reference of 150 KB for the 2SD2206, categorised as a schematic though the name is simply a transistor number. Following JIS rules, 2SD signals an NPN bipolar transistor for low-frequency circuits, so expect a datasheet with ratings, curves and a package drawing. Use it to confirm which lead is base, collector and emitter and to pick a substitute with adequate margins. Match the marking on the board before acting 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)