PDF titled bl8526, 611 KB, classed as a schematic. Apart from the code itself the name gives no information about the device or maker, so treat it as a component reference that still needs checking. Documents named after an IC code usually contain the pin descriptions, electrical characteristics and a typical application circuit, which a repair technician uses to check supply and enable pins and identify missing outputs. Compare the package and top marking on the board with the drawings before replacing the part. Readable in any standard PDF viewer.
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.