Ratoc Systems U2SCXU - Manual (Page 66)

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4.Troubleshooting
4-1.General Hardware Troubleshooting
n Be sure the U2SCXU’s power LED comes on. If the LED doesn’t come on,
your SCSI device may not provide SCSI bus termination power. If the
SCSI device can’t provide it, an OPTIONAL AC adapter is required.
For purchasing information, refer to Chapter 6.
n Be sure the U2SCXU is firmly connected to your SCSI device.
n Be sure the USB cable is firmly connected to a USB port on your PC or Mac.
n Be sure each SCSI device has a SCSI ID except 7.
n Be sure the SCSI power cable is properly connected and the SCSI device
is powered.
n Be sure the last SCSI device has a terminator.
n Some SCSI devices may not have the capability of providing enough
termination power to the U2SCXU. We recommend you use an OPTIONAL
AC adapter to avoid it. For purchasing information, refer to Chapter 6.