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 1.2KOhms.

Replace the board if voltage supply to the MIC is below 4.5Vdc or replace keypad if Mic impedance is not 1.2Kohms.