Document for the BQ24730, a Texas Instruments laptop battery charger controller, supplied as a 4.13 MB PDF. The size suggests a full datasheet, possibly with evaluation module material, showing pin functions, typical application and timing details. Board-level technicians use it to identify the pins around the charger, measure input and battery sense signals, check the switching MOSFET drive and narrow down faults such as a dead board on adapter or a battery that never charges. Match the part marking before using the pin numbering.
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.