Samsung SM-A20S schematic section covering the Wi-Fi, Bluetooth and GPS circuitry, supplied as a 4.63 MB PDF. It shows the wireless connectivity block, antenna paths, matching components and supply lines feeding the radio section. A technician uses it to trace why Wi-Fi or Bluetooth will not switch on, check antenna feed continuity, and locate filters and capacitors around the connectivity chip. Open it in any PDF viewer and confirm the phone is the SM-A20S variant before comparing part locations.
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 @phoneSchematics. 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.