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Knocking sound from my Epson DX4400 printer scanner?

Hi, I have an Epson DX4400 and I have a problem.
When I switch it on the scanner head moves across the bed but when it gets to the end I get a knocking noise. It's like the scan head doesn't know it's got to the end and keeps trying.
This printer is being used as a stand-alone so the problem has nothing to do with my PC or any software.
I'm happy to go inside the printer/scanner if that’s required.
Please Help, March 2010
link Click here to see other fixes for Epson DX4400.