Ratoc Systems U2SCXU - Manual (Page 89)

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Check the following points:
1)Be sure the SCSI device is powered on properly.
2)Turn off the SCSI device and make sure the U2SCXU is attached firmly, and
turn on the device again.
If the LED doesn’t come on even if you have done the above checking,
refer to the user’s document on the SCSI device. Though SCSI specifications
require Term-Power output capability as an optional, some SCSI devices
such as iomega Zip drive may not be implemented this capability. If your
SCSI device doesn’t have this Term-Power output capability, you must
connect an OPTIONAL AC adapter(sold separately) as shown below or
daisy-chain a SCSI device which has this Term-Power output capability.
But, if you are a Mac user, don’t daisy-chain another SCSI device. Windows
users only can daisy-chain another SCSI device. If you are a Mac user, you
must connect the optional AC adapter.
For purchasing information, refer to Chapter 6.
4-10.When the power LED doesn’t come on(Win/Mac)
Optional AC adapter
AC adapter jack