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Troubleshooting
• Does your computer meet the USB specifications?
If you are using a computer that does not fulfill the electrical requirements of the USB
specifications, operation may be unstable. In this case, you may be able to solve the
problem by connecting a USB hub.
• Does “Unknown device” appear for “Other device” or “Universal serial bus
controller”?
Use the following procedure to delete “Other device” (Universal Serial Bus Controller)
“Unknown device”, and then restart your computer.
1. In the Windows Control Panel, double-click System. The System
Properties dialog box will appear.
2. Click the Device Manager tab.
3. Double-click “Other device” or “Universal Serial Bus Controller” to
display a list of devices.
4. From the list, select the unknown device and click [Delete].
5. In the dialog box that asks you to confirm the deletion, click [OK].
6. Verify that “Other device” or “Unknown device” is not displayed in the list,
and click [Close] to close the dialog box.
“Found unknown device” appears even though you
installed the driver
If your computer or USB hub has two or more USB connectors, and you connect the
UA-20 to a USB connector to which the UA-20 has never been connected before, the
“Unknown device” dialog box may appear even on a computer onto which you have
already installed the driver.
Refer to Getting Connected and Installing Drivers (Windows) (p. 16), and install the
driver once again. This is not a malfunction.
Driver is not installed correctly
As described in Deleting the special driver (p. 79), delete the USB audio device driver
that is installed in your computer, and then install the UA-20 driver once again as
described in Getting Connected and Installing Drivers (Windows) (p. 16). Also check
whether there is an “Unknown device” in “Other devices” or “Universal Serial Bus
Controller”.
If you find one, delete it.