Fujitsu fi-4120C Operator's Manual page 51

HINT
3.
Press down the scanner power button on the
Function No. display to turn on the scanner.
4.
Press the power button on the face plate of the
PC to turn on the PC.
24 2.2 Connecting the Scanner to a PC
The factory default setting for SCSI ID is
"ID 5". If the SCSI ID of another SCSI
device is set to the same ID, either change
the scanner's SCSI ID or change the
SCSI ID of the other SCSI device. For
details on how to change the SCSI ID, see
"I Setting the SCSI ID" in this section.
This scanner is provided with two interfaces:
SCSI-2 and USB1.1.
On this scanner, each of the SCSI and USB
interfaces is controlled exclusively, so both
interfaces cannot be used simultaneously.
Scanner can be only connected to either USB or
SCSI interface.