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11-19-2010 07:04 AM
Not sure which printer you are using, but THIS document should cover the basics to resolve such an issue.
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I am an ex-HP Employee.
11-28-2010 08:37 AM
Someone else on another forum on this topic said apply some weight to the top of the printer. I turned off my printer and then turned it on again, applying pressure when it scanned and it worked!