Canon DR-3080CII Startup Manual page 60

Cause The scanner's SCSI ID is identical to the SCSI ID of
another device.
Action
Check the SCSI IDs of all SCSI devices connected to the system
and set a unique SCSI ID for the scanner.
Cause The terminator is not set correctly.
Action Shut down both the PC and the scanner, and then turn the scanner
on first, and then the PC.
Cause The PC was turned on before the scanner.
Action Shut down both the PC and the scanner, and then turn the scanner
on first, and then the PC.
Cause The scanner is not on.
Action
Refer to the previous section, "The scanner does not turn on,"
and check to see if the scanner is on. If the scanner is not on, shut
down the PC, then turn the scanner on first, and then the PC.
Cause The SCSI board is not compatible with the scanner.
Action Use a recommended SCSI board. (See "SCSI Boards" on p.18)
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Troubleshooting