PNP bipolar transistor 2SA1313, named under the Japanese JIS scheme, is documented in this 207 KB PDF. Catalogued as a schematic, its content is probably the part datasheet rather than a circuit drawing. It serves to check terminal order before installing a replacement, look up collector-emitter and collector-base limits, and read the hFE classification letters. Open it with any PDF reader; the name provides no manufacturer or edition details, so compare markings and package before ordering parts.
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.