Datasheet for the 2SD2131 transistor, provided as a 240 KB PDF in the schematic section. Under Japanese JIS naming, the 2SD prefix indicates an NPN low-frequency type, typical of driver, switching and audio stages. The sheet lists absolute maximum ratings, gain grouping, saturation voltages and the package outline with pin numbers. Use it to confirm a replacement before soldering, and measure the original part out of circuit with a diode tester to be sure it really failed.
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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The standard format for schematics, block diagrams, power-sequence charts and service manuals.