The scanner has two LED lights on the front panel that indicate scanner functions and error conditions. The LED in the shape of an exclamation point (!) is the Attention LED, and the LED in the Power Save button is the Power LED. The table below explains how to interpret the indicator LEDs.
Figure : LED graphic

LED indications
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Scanner action or condition
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Error condition. Check your computer screen for an error message.
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Attention condition. Check your computer screen for a Maintenance Recommended message.
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The scanner is warming up.
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The scanner is in Power Save mode.
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The scanner is on and ready to scan.
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The scanner is scanning an original.
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Both LEDs are off.
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There is no power to the scanner.
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