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Is your computer's power-conservation mode turned off?
If power-conservation settings are enabled on your computer, please disable any such settings.
For the procedure, refer to the owner's manual of your computer.
Is there sufficient free space on your hard disk?
Delete unneeded files to increase the amount of free space. After deleting the unneeded files,
empty the recycling bin.
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.
In the Device Manager, do you see "Other device," "Unknown device," or a device
for which "?", "!" or "x" is displayed? (Windows)
If the driver installation could not be successfully completed, the installed driver may remain in an
incomplete state.
Re-install the driver. (➔"Installing the Driver" (p. 15))
Is OMS or FreeMIDI installed? (Mac OS 9)
The UM-3 driver cannot be installed unless OMS or FreeMIDI are installed. Please install OMS or
FreeMIDI.
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