PDF for the BD9483F, 938 KB, catalogued as a schematic. The name carries only the part number, which follows ROHM BD-series numbering with an F package suffix; the document is most likely the datasheet for this IC. Repair technicians open such a file to read the pinout, operating ranges and reference application circuit, then measure supply, enable and output pins in circuit to decide whether the chip or its surrounding components have failed. Confirm the printed marking matches before replacing it. Readable in any PDF program.
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 @gunvantrathore. 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.