PDF reference for the BQ24721C, a Texas Instruments multi-chemistry battery charge controller used in older notebooks. The 1.91 MB size suggests a complete datasheet including pin descriptions, timing, protection features and a typical application diagram. Repair technicians use it to measure expected voltages on each pin, understand adapter and battery selection logic and identify why a board fails to charge or shorts on the DC-in rail. Confirm the chip suffix on the board matches before relying on the values.
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 @laptopbios21. 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.