PDF schematic whose name is only the code CDX-G1152U. That code matches the style of a Sony car audio head unit model, but the name gives no further revision or board details. A schematic like this lets a technician trace power supply rails, amplifier and tuner signal paths, and check component values while diagnosing faults. Any PDF reader opens it, and text search helps locate part references quickly. Check the model and service revision on the unit before relying on specific 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 @datasheets1. 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.