Filed under schematics, this 84.0 KB PDF carries only the part number 2SD1153 in its name and should be a transistor datasheet. The 2SD prefix follows JIS numbering for NPN bipolar transistors intended for low-frequency circuits. Repair use is straightforward: identify the leads, read the gain grade and absolute ratings, and compare them with any candidate equivalent. Measuring the original out of circuit first avoids replacing a good part when the real fault lies elsewhere.
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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