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If the ADF is flashing, then it thinks there is a jam in the automatic document feeder. And that would be on the top of the device where you would typically feed in papers to be scanned or copied. Make sure that is clear of paper and anything else that possibly could have fallen in there. Also make sure there is nothing on the glass surface of the scanning part because that will also indicate and ADF jam because it cannot feed the paper through while that is there. Please let me know if this addresses your concerns or if you need additional help.
Then the next thing to check is the connection from the ADF to the scanner.