Network (cellular RF) portion of the Samsung SM-A20S schematic in PDF form, 4.63 MB. The pages cover the radio front end, power amplifiers, antenna switches and the related supply and control lines used for mobile signal. Repairers use it to diagnose no service, weak signal or missing IMEI-related RF faults, to identify which filter or switch sits on a given band path, and to check antenna connectors. RF faults often need component-level comparison, so confirm the SM-A20S model and board before replacing parts.
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.