Scanjet 4890 light bar travels to end of scanning glass and will not return to beginning

My ScanJet 4890 sometimes does not work properly.  In the preview mode, the light bar will sometimes travel to the end of the scanner with light on and not return back.  The motor gets a high pitched whine.  I have to turn the scanner off and back on the get the light bar to return to the starting position.  Sometimes it does work properly.    How do I fix my scanner?
This question was solved.
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I found an unusual solution to my own problem.  I drilled a hole in the front of the scanner case.  Then when the light bar gets stuck, I poke a pencil through the hold and give the light bar a shove.  The bar moves on it's own and returns to it's parked position. Then,  I can continute without turning the scanner on and off.  I suspect that the motor needs to be replaced, which I may eventually do if I can find the right one.

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