Does the text or the diagrams on the back (of the document) appear?
Try scanning again after configuring the scan settings to reduce bleed-through in the following procedure:
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Display the scan window of ScanSnap Home on the computer.
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Select the profile that you are using from the profile list.
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Click the [Edit profiles] button to display the [Edit profiles] window.
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Click the [Detailed settings] button in [Scan settings] to display the [Detailed settings] window.
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Click the [Option] button in the [Scan] tab to display the [Scanning options] window.
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Select the [Reduce bleed-through] checkbox. Or, select the [Increase text contrast] checkbox.
Are the rollers or glass inside the ScanSnap dirty?
Clean the inside of the ScanSnap.
For details about how to perform cleaning, refer to ScanSnap Help.