Component reference PDF of 81.0 KB for the 24C04 serial EEPROM, 4 Kbit (512 bytes) on the I2C bus. The underscore in the name adds no information, and no board or device is stated, so this is best treated as a datasheet. It helps when checking which pins carry SDA, SCL and WP and how the chip responds to device addressing. When servicing a unit with corrupted settings, dump the existing data first, then compare or rewrite it using a suitable EEPROM programmer.
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.