Audio section of the Samsung Galaxy A02s (SM-A02S) schematic in PDF, covering microphone, loudspeaker and earpiece circuits, at 1.79 MB, smaller than the other pages in the set. Expect codec connections, the speaker amplifier, earpiece lines and microphone bias with filters. Use it when callers cannot hear you, the speaker is silent or the earpiece is dead, measuring along each path to locate the failed part. Make sure your handset is the same A02s variant before relying on component positions.
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