Audio & Microphone Diagnostics
Also known as: Sound Test, Speaker and Mic Verification
Testing of phone speakers and audio inputs, verifying the top earpiece speaker, bottom multimedia loudspeaker, primary call microphone, and secondary noise-cancellation microphones.
How TrueVolt Applies This Standard
Audio & Microphones represents Subsystem 4 of the TrueVolt Pro Diagnostic protocol, ensuring call acoustics and media playback are crisp, loud, and undistorted.
Technical Overview & Context
Audio testing involves playing frequency sweeps to detect speaker buzzing or diaphragm tears, and recording voice samples across all discrete microphones to confirm noise-cancellation algorithms function without muffling the speaker’s voice.
Related Guides & Checklists
How to Check a Refurbished Phone: In-Store Inspection Checklist
Step-by-step checklist for inspecting a refurbished smartphone in-store. Learn how to verify cosmetic condition, screen response, battery, IMEI, and hardware functions.
Understanding Device Diagnostic Reports: What Gets Tested
Learn what the optional 32-point TrueVolt Pro Diagnostic report covers across display, sensors, buttons, audio, and connectivity. Understand how reports are generated.