Samsung SM-A05 audio schematic page showing the microphone, loudspeaker and earpiece circuits, 6.27 MB PDF. Use it when callers cannot hear you, the loudspeaker is silent or earpiece sound is missing. It shows the codec or amplifier outputs, microphone bias and data lines, the speaker connections and the filter coils and capacitors along each path, so you can measure the signal chain step by step. Open with a standard PDF reader and make sure the handset is an SM-A05 before following component designators.
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.