Indexed as a schematic, this 72.3 KB PDF relates to the 2SB888, likely as its data sheet. Japanese JIS designation uses 2SB for PNP transistors of the low-frequency class. The name offers no further detail. Inside, look for absolute maximum ratings, electrical characteristics and the case drawing. These are needed when confirming terminal identity for in-circuit tests or selecting an alternative part. Always compare the package type and marking on the board with the drawing before fitting a replacement.
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.