Visitor to Tenant MIC is breaking up (and very low)

Load/MIC issue through wear and tear and or power variance:

  • Remove all additional loads feeding from the board (cameras, attached module, etc.);
  • - Place a call, if it did not change, then measure the voltage on the MIC (Voltage should be around 5 VDC);
  • - Disconnect MIC from the main board and measure impedance (should be around 1.2KΩ).
  • Replace the board if voltage supply to the MIC is below 4.5Vdc or replace keypad if Mic impedance is not 1.2KΩ

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