Here is a compact 73.3 KB PDF whose name, 1SS250, identifies a discrete part instead of a board, so treat it as a component datasheet despite the schematic label. The 1SS series in JIS numbering covers small-signal diodes. Expect absolute maximum ratings, electrical characteristics and an outline drawing with dimensions. A technician checks these figures when a diode measures abnormally in diode mode, or when choosing a cross-reference part with equal reverse voltage and current ratings. Open it in any standard PDF reader.
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.