Datasheet for the 2SD2223, in PDF form at 133 KB and indexed as a schematic. The name identifies only this transistor type. JIS designation 2SD stands for an NPN bipolar transistor for low-frequency applications. Read the ratings and characteristic curves when diagnosing a failed stage, choosing a cross-reference or confirming correct orientation on the PCB. Test the removed part with a meter in diode mode first, since a nearby fault can make a healthy transistor look bad in circuit.
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