Roland UM-3EX Owner's Manual page 50

Windows XP/2000 displays a "Hardware Installation" or "Digital
Signature Not Found" dialog box
Did you make "Driver Signing Options"?
In order to install/re-install the driver, you must make the settings described in "Driver Signing
Options" (p. 16).
"Find new hardware wizard" does not execute automatically
"Find new hardware wizard" ends before the process is completed
"Found unknown device" appears even though you installed the driver
(Windows)
Is the USB cable connected correctly?
Make sure that the UM-3EX's USB cable and your computer are correctly connected.
It may take about 15 seconds (or more) after the USB cable is connected.
Does your computer or USB hub have sufficient power supply capacity?
The UM-3EX cannot be connected if insufficient power is supplied to it. Check whether one of the
following cases apply.
• If you are using the UM-3EX with a notebook computer that is running on its battery, operation
may be unreliable with some models of computer. If this is the case, connect the AC adaptor to
your notebook computer.
• The power conservation mode of your computer may limit the power that is supplied to USB.
Check the settings of your computer.
• In some cases, the UM-3EX cannot be used with a bus-powered hub (a hub that does not contain a
power supply). Please use a self-powered hub (a hub that contains a power supply).
Is USB enabled on your computer?
Refer to the operation manual for your computer, and make sure that USB is enabled.
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.
50