At 383 KB, this PDF titled 2SJ104 is filed as a schematic yet most likely holds the datasheet for that part. In the JIS scheme the 2SJ prefix marks P-channel field-effect transistors. Look inside for package outline, pin assignment, ratings and typical characteristic curves. Technicians use such information to test the transistor with correct polarity and to choose a suitable replacement; confirm the grade or suffix marking on the fitted part first.
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.
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