Here is a picture of the XLR connector with pin numbers. Looks like the signal connectors are OK.
Do you have a multimeter? Can you check the cable to make sure:
1. Connector J9 pin 1 (input signal +ve) is connected to XLR pin 2
2. Connector J9 pin 2 (input signal -ve) is connected to XLR pin 3
3. Connector J9 pin 4 (GND) is connected to XLR pin 1
With the NC400 module to the XLR receptacle cable connected, check:
4. Connector J9 pin 3 (nAMPON) is shorted to chassis, and the NC400 module mounting screws are also shorted to the chassis
[Edit] For step 4 above, I think it is easier to check (with the module to XLR cable installed)
4. From the back of the connector, J9 pin 3 and J9 pin 4 are shorted to each other
5. They are also shorted to the module mount screw, and to the chassis
Do you have a multimeter? Can you check the cable to make sure:
1. Connector J9 pin 1 (input signal +ve) is connected to XLR pin 2
2. Connector J9 pin 2 (input signal -ve) is connected to XLR pin 3
3. Connector J9 pin 4 (GND) is connected to XLR pin 1
With the NC400 module to the XLR receptacle cable connected, check:
4. Connector J9 pin 3 (nAMPON) is shorted to chassis, and the NC400 module mounting screws are also shorted to the chassis
[Edit] For step 4 above, I think it is easier to check (with the module to XLR cable installed)
4. From the back of the connector, J9 pin 3 and J9 pin 4 are shorted to each other
5. They are also shorted to the module mount screw, and to the chassis
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