By default, the scanner will enter Sleep Mode after 15 minutes of inactivity, and will turn off automatically after two hours of inactivity to conserve power.
Windows: To change the default auto-off settings, complete these steps:
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Start the HP Scanner Tools Utility by doing one of the following:
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Click Start, point to Programs or All Programs, point to HP, point to ScanJet, point to 2500 f1, and then click Scanner Tools Utility.
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On the Start screen, click to HP Scanner Tools Utility tile.
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Click the Settings tab, and then select the appropriate sleep mode and auto-off settings.
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To specify the period of inactivity after which the scanner automatically turns off, select the appropriate value (1 hour, 2 hours, 4 hours, or Never) from the Auto-Off: Turn off the scanner after: drop down list.
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Mac OS X: Use HP Utility to change the default sleep and auto-off settings.