Datasheet-style PDF for the 24LC21 family serial EEPROM, with the I_P suffix in the name likely pointing to an industrial-temperature or PDIP package variant, though the name alone does not confirm it. Although indexed as a schematic, a 24LC21 part is normally documented by datasheet. The 24LC21 is a 1 Kbit dual-mode I2C EEPROM used for monitor DDC/EDID storage. Technicians use such a document for pinout, supply voltage and timing when reading or rewriting EDID data with a programmer. Check the package and marking on the chip 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.