The following is troubleshooting information in the event that the UA-25EX is unable to get audio from a connected microphone:
- Be sure that the DIRECT MONITOR knob is pointing at 12 o'clock (straight up):
- Be sure that the ADVANCED switch is set to the ON position and that the driver has been installed.
- Connect the UA-25EX to the computer and be sure that the USB light
illuminates on the front panel of the interface. If the USB light does not illuminate, uninstall and reinstall the driver for you operating system. The driver can be downloaded here:
https://www.roland.com/us/products/ua-25ex/downloads/
Note: Due to the age of the product, drivers for later operating systems are not available and there's not a workaround to allow compatibility. - After the USB light illuminates on the front panel, connect the microphone into INPUT 1L or INPUT 2R on the UA-25EX.
- If the microphone has an ON/OFF switch, set the switch to the ON position.
- If the microphone requires phantom power (48 volts), set the PHANTOM+48 switch on the back panel to ON.
NOTE: Phantom power is only supplied to the XLR inputs and is not supplied to the 1/4" inputs. - Turn down the UA-25EX's OUTPUT level completely counter-clockwise (off).
- Turn up the SENS 1L or SENS 2R knob completely clockwise (turned up all the way).
- Tap on the microphone.
a. If you see the PEAK/LIMITER
light blink, audio is being input correctly.
b. If you don't see the PEAK/LIMITER light blink, the UA-25EX is not receiving an audio signal from the microphone. Try a different audio cable and then a different microphone (if one is available). As the issue is most likely due to a faulty cable or microphone. - If the problem continues, the UA-25EX may need service unfortunately. We recommend that the product be sent directly to our facility in Ontario, CA if it needs service:
http://www.rolandus.com/support/service_request/?_ga=1.60226414.2138427752.1417454654