Labelled 21FQ, this 44.9 KB PDF sits in the schematic category but states nothing about the device, board number or revision it relates to. The small size and part-style name suggest a brief reference sheet, possibly for a series of components rather than one board. View it in any PDF program to confirm what it holds. Use it for checking pin assignments and ratings while measuring a suspect part in circuit. Make sure the series marked on the actual part agrees with the document before you base a repair decision on it.
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.