Fujitsu ScanSnap S500 Operator's Manual page 45

The power supply of this scanner is controlled by performing the following
HINT
actions:
•
Open/close the paper chute on the scanner.
•
Turn on/off the personal computer to which the scanner is connected.
•
Press the [POWER] button on the scanner (when the paper chute is opened).
Opening /closing the paper chute controls the scanner's power. For example,
the scanner will not be turned on even when you have switched on your per-
sonal computer if the paper chute is closed.
Generally, you can simply turn on/off the scanner only by opening/closing the
paper chute when the scanner is connected to your personal computer.
2.2 Connecting ScanSnap to your PC
ScanSnap S500 Operator's Guide
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