Most of the time the noise is coming from the bobbin area due to lint, debris and lack of lubrication. When you look in the bobbin area and turn your machine by hand, you will see the rotary hook rotating around the bobbin case, place a drop of oil on the hook where it touches the metal around the bobbin case and this should quiten it down.
If this is a computorized machine, you do not oil it.
Check the maintenance section of the manual for this model.
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