Documentation for the 2SA1402 transistor, a 119 KB PDF indexed in the schematic section. The 2SA designation in the JIS system belongs to PNP devices intended for high-frequency circuits. The file name gives no other information. A technician uses it to confirm package type and pin assignment, check the voltage and current ratings against the circuit, and evaluate replacements, remembering that equivalents from different manufacturers sometimes arrange the leads differently.
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.