Another copy of documentation for the 2SD1458 NPN transistor, stored as a 48.8 KB PDF under a lowercase file name. It may differ in edition or publisher from other files carrying the same number. Under JIS numbering, the 2SD family covers NPN devices for low-frequency duty such as amplifier outputs, drivers and regulators. A repair technician typically reads the absolute maximum ratings and pin assignment, then tests the suspect part in diode mode on a multimeter. Verify the package type against the one on your board.
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.