I have a Brother 8500D that makes a distinctive sound of a 'spring' being sprung every second. The dealer isn't any help as she is pushing the new models at me. Repair guy claims he can't hear it so can't fix it. He needs to retire. It drives me crazy even if other noise is around me. Odd it doesn't do it when embroidering (it embroiders beautifully) only sewing. I won't use it for regular sewing because of the irritating 'ting'.