PDF document, 28.7 KB, labelled as a schematic and named 3LP01SP. The name points to an individual semiconductor part code with an SP suffix and gives no device, brand or board number. Expect a compact sheet covering maximum ratings, characteristics and a package drawing. In repair work it helps confirm what a small marked component is, where its gate, source and drain or equivalent pins sit, and whether a replacement fits the footprint. Check the complete marking and suffix on the original part first.
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.