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Canon 8400F Scanner keeps returning ERROR: release lock switch, detach I/F cable and reconnect. The lock switch IS in the unlocked position, but scanner will not scan.

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Have exact same problem on a Canon scanner (N1220U) which is several years old. Suggest you uninstall the driver software and reinstall it. I did and my scanner is scanning fine again.

Posted on Dec 27, 2008

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