Compact 33.0 KB PDF on the 2SK1834 transistor. The 2SK prefix belongs to the Japanese JIS designation system and means an N-channel field-effect device, so the content is most likely a datasheet rather than a circuit diagram. No manufacturer or package is named. Repair work uses this kind of sheet to confirm pinout, read voltage and current limits and pick a compatible substitute after a short. Measure the replacement against the original specification and make sure the footprint on the PCB matches the listed package.
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.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.