PDF documentation, 32.7 KB, for the 3SK269, indexed under schematics. The JIS code 3SK marks an N-channel field-effect transistor with four terminals, generally a dual-gate MOSFET used as an RF amplifier or mixer in tuners and receivers. The sheet lets a technician confirm which lead is which on the small package, check drain voltage and dissipation ratings and compare candidate replacements. Since tiny RF parts carry abbreviated markings, match the code against the document before fitting.
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.