The 276 KB PDF here is labelled 24c04, the 4 Kbit (512-byte) two-wire serial EEPROM used widely to store configuration and calibration data. No vendor or device information is carried by the name. Repair technicians open such a sheet to check pinout, operating voltage, page-write behaviour and addressing before in-circuit or out-of-circuit programming. Verify that the part number printed on the chip matches, and read and save its contents before attempting any erase or write operation.
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.