Troubleshooting - Edirol UM-2 Mode D'emploi

Troubleshooting

* Please read the "Readme_E.txt" file in the UM-2 Driver CD-ROM.
You can get any additional information not written in the owner's
manual from the "Readme_E.txt" file.
Windows Users → P.112
Macintosh Users → P.115
Windows users
Case 1: USB connections cannot be made correctly
Has the UM-2 been recognized?
Disconnect the USB cables, and then re-connect them.
It is possible that the computer has failed to recognize or
initialize the UM-2. Leave the USB cable connected to the
UM-2, and restart Windows. If connection still does not occur,
exit Windows, and turn off the power of your computer. Then
turn on the power of your computer and start Windows.
Are your computer or USB hub (*) supplying sufficient current?
If insufficient current is being supplied to the UM-2,
connection is not possible.
• Use a USB hub which contains its own power
supply.
• The power conservation mode settings of your
computer may be limiting the current supplied to
the USB, so check these settings.
What is USB hub?
A "USB hub" is a device that expands the number of
USB connectors. Broadly speaking, there are two types
of USB hubs.
Self-powered hubs (USB hubs containing a power
supply): The USB hub itself has an AC adapter, which
supplies power (normally 500 mA) to the added USB
connectors.
Bus-powered hubs (USB hubs not containing a
power supply): The hub does not contain a power
supply. The power supply of the connected computer is
re-distributed to the added USB connectors.
112
For details on the electrical
current that can be supplied by
your computer or USB hub
refer to the owner's manual for
your equipment. If you have
questions, please contact the
manufacturer or dealer for
your computer or USB hub.
The UM-2 cannot be used with a
hub that contains no power supply.
When a USB device is connected
to a computer, the USB device
tells the computer how much
electrical current it uses. If this
value exceeds the current that
the computer is able to provide
(maximum 500 mA), the device
cannot be connected. The UM-2
will request 120 mA of current
when it is connected to a
computer. Most computers or
self-powered USB hubs will
have no problem with this
current capacity. If you are
using a dual-mode USB hub
(self-powered / bus-powered),
be sure to connect its power
supply (AC adapter etc.) and
use it as a self-powered USB
hub.