This datasheet PDF of 179 KB covers the 2SD2480 transistor and contains no further detail in its name. The JIS 2SD designation signals an NPN bipolar transistor for low-frequency circuits such as drivers, regulators and audio stages. Although indexed as a schematic, it is used to look up lead assignment, breakdown limits, current rating and package dimensions. Check that the part on the board carries this code, often printed as D2480, and compare any substitute's ratings before installing it.
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