Samsung S5303 component document in PDF, 2.77 MB; the Comp suffix suggests component location drawings for the main board. These layouts let a repair technician match reference designators from the schematic to physical parts, which speeds up locating a shorted capacitor, a charging IC or a connector pad. Use it alongside the circuit diagram when tracing rails or signals with a multimeter. Any PDF viewer opens the file; check that the board number and revision printed on the PCB correspond to the drawings before replacing components.
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 @Schematics_Mobile. 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.