Roland V-Synth Owner's Manual page 147

Problem
An "Unknown driver found"
dialog box appears, and you
are unable to install the driver
Device Manager shows "?",
"!", or "USB Composite De-
vice"
Driver is not installed correct-
ly
Can't install/delete/use the
driver in Windows XP/2000
Windows XP/2000 displays a
"Hardware Installation" or
"Digital Signature Not Found"
dialog box
Deleting Incorrect Device Information
Use the following procedure to re-install the driver.
1. Turn off the power of your computer, and start up Windows with all USB cables disconnected (except for
keyboard and mouse).
2. After Windows restarts, use a USB cable to connect the V-Synth to your computer.
3. Turn on the power of V-Synth.
4. Click the Windows Start button, and from the menu that appears, choose Settings | Control Panel.
5. Double-click the System icon. The System Properties dialog box will appear.
6. Click the Device Manager tab.
In Windows XP, select the System Properties Hardware tab, and click Device Manager.
7. Check whether "Roland V-Synth" with an "!" or "?" symbol is displayed below "Other Devices," "Sound,
Video, and Game Controllers," or "Universal Serial Bus Controller." If you find any such indication, select it
and click [Delete].
8. A dialog box will ask you to confirm deletion of the device. Verify the contents of the dialog box, and then click
[OK]. In the same way, delete all occurrences of "Roland V-Synth" that have an "!" or "?" symbol.
9. Check whether "Composite USB Device," "USB Device," or "USB Composite Device" with an "!" or "?"
symbol is displayed below "Other Devices," "Sound, Video, and Game Controllers," or "Universal Serial Bus
Controller." If you find any such indication, you need to determine whether it has appeared because the V-
Synth has been detected incorrectly, or because there is a problem with some other device. To determine this,
switch off the power of the V-Synth.
* If the "Composite USB Device" (or other) indication disappears when you turn off the power of the V-Synth, then it is the V-
Synth that has been incorrectly detected. Return to step 2 and continue the procedure, and when you reach step 8, delete the
information that was detected incorrectly. If the indication does not disappear when you turn off the power of the V-Synth, then
this indication refers to a different device. Do not delete it.
"Composite USB Device," "USB Device," or "USB Compatible Device" may sometimes indicate a device other than the V-
Synth. Be careful not to accidentally delete the registration for another device. If you delete the registration for another device, you
will have to reinstall the driver for that device.
Cause
It is possible that the computer has detected the V-
Synth incorrectly.
Did you log on to Windows as a user with administra-
tive privileges?
Did you make "Driver Signing Options"?
Did you make "Driver Signing Options"?
Troubleshooting
Action
As described in "Deleting Incorrect Device Informa-
tion" (p. 147), delete the incorrect device information,
then re-install the driver.
In order to install/delete/re-install the driver in Win-
dows XP/2000, you must be logged into Windows as a
user with administrative privileges, such as Adminis-
trator. For details, please contact the system adminis-
trator for your computer system.
In order to install/re-install the driver, you must make
"Driver Signing Options."
In order to install/re-install the driver, you must make
the settings described in "Driver Signing Options."
147