The 2SK1606 N-channel field-effect transistor is described in this 36.7 KB PDF, the 2SK prefix following Japanese JIS/JEITA registration. No manufacturer, package or revision is stated by the name. Technicians open sheets like this in a PDF viewer to check pinout before diode-mode testing, to read absolute maximum ratings, and to pick a substitute with equal or higher voltage and current capability that fits the same pads.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)