Audio schematic section for the Samsung SM-A12 covering the microphones, loudspeaker and earpiece, delivered as a 3.40 MB PDF. Use it to troubleshoot callers who cannot hear you, a silent ringtone or a dead earpiece, tracing the signals from the codec or amplifier to each transducer and checking filters and bias lines. Testing the speaker and earpiece coils for continuity is a quick first step. The name lists only the SM-A12 series, so confirm the exact model and board revision before replacing components. Readable in any PDF viewer.
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