Samsung Galaxy A5 (2016) schematic for model SM-A510FD, the dual-SIM variant, as a 2.56 MB PDF. The extra Direy-6 text in the name is not a recognised technical token and is not explained here. Technicians use the diagrams to trace power and charging circuits, SIM and RF paths, and display connections while hunting for shorts or open lines. Any PDF viewer opens it. Check that the model code inside the phone matches SM-A510FD, since single-SIM versions can differ in the SIM and RF sections.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.