A 233 KB PDF named 1B22, catalogued as a schematic, whose short code gives no device, board number or brand. It seems to be part of a numbered series with 1B21 and 1B31, and could be a datasheet for a small discrete part. Look at the first page to see what it covers. Technicians use such files to check pin functions, ratings and dimensions before replacing a part. Compare markings on the actual component with the document before trusting its values.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)