Audio page of the Samsung SM-A30S (Galaxy A30s) schematic, covering microphone, loudspeaker and earpiece circuits, saved as a 4.30 MB PDF. It shows the audio codec or amplifier connections, microphone bias lines and speaker outputs. Technicians reach for it when callers cannot be heard, the speaker is silent or the earpiece is dead, to check amplifier supply, trace audio lines and find filter coils that often fail. Open in a PDF reader and confirm the designators against the physical board.
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.