Do you get any errors with this or does it just say remove the scanner lock ?
We've seen this error a few times, one cure is a firmware update, you can get an error code as well from people opening the lid, placing some paper on then pressing the start button before the lid is fully down - it's easy to check for that one and eliminate it though.
The firmware update should update the copy control board / scanner control boards and may resolve the issue.
If not then it would be diagnostics time to see what happens, I know on some units despite the scanner lock message you can still perform scanner diagnostics and see what does and doesn't function.