A customer is reporting that a wireless handheld microphone is not working in a space. You’ve tested the microphone (including transmitter), the channel input on the mixer and all associated connections and the mic still does not work. What is the next logical step in troubleshooting?

a. Swap the microphone receiver with another known working unit, making sure the frequency/channel matches.
b. Specify a new replacement wireless microphone system for the user as the current system is not operational.
c. Specify a new mixer for the user as the current system is not operational.
d. Tell the user they'll need to engage the manufacturer for any further troubleshooting and RMA process as that's out of your scope.

Update:

The correct answer is: 

a. Swap the microphone receiver with another known working unit, making sure the frequency/channel matches.

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