Covering the 2SK3119 transistor, this 149 KB PDF is indexed as a schematic but is in practice a component sheet. 2SK identifies an N-channel FET in the JEITA designation system. It supports typical repair tasks such as identifying gate, drain and source before measuring in circuit, checking maximum ratings, and selecting a replacement with equal or better voltage and current figures. Check that the marking on the fitted part agrees with this number before relying on it.
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.