Soft dB SmartSMS 2 - 5. No signal from the active inputs

SmartSMS User Manual Soft dB inc.
User Manual p. 112
5. No signal from the active inputs
If the signal on the active inputs is very low (30 dB and below) or do not react to noise in the room,
there is a problem.
• 95% of the time, it is caused by bad BNC connectors on the coaxial wire. Check and/or
redo BNC connectors. Try connecting a sensor directly to the SmartSMS unit to see if the
input and the sensor are working properly.
• If using a preamp, make sure that the preamp is powered ON.
• Try switching the sensor to see if the sensor might be problematic.
• Try switching inputs to see if the input on the SMS is problematic.