Component data for the 2sd2396, supplied as a 42.0 KB PDF and indexed under schematics. The 2SD prefix belongs to the Japanese JIS scheme for NPN bipolar transistors meant for low-frequency circuits. No package, revision or manufacturer appears in the name. Expect maximum ratings, electrical characteristics and the lead layout. Those let a technician identify the pins on the board, check for a collector-emitter short and pick an equivalent with matching voltage and current capability.
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.