This problem maybe cause by the stepping motor being sealed or the main board problem. Please go to your local sewing machine mechanic.
SOURCE: My feed dog is stuck in the down position.
if the button will move but the feed dogs don't then the feed dogs need to be check, at a repair shop,
SOURCE: My machine had been working
Most machinary is built with some adjustment feature and I see that you have thoroughly checked for loose,missing or broken parts, so that leaves only the adjustment left.
Examine the mechanism to see how the feed dogs operate and try to find the adjustment.
It sounds as if the dogs have moved down and you need to release a clamping screw to raise it a little and re-tighten the screw.
While you are inside, check for any slop in the fittings before attempting any adjustment.
SOURCE: My fabric wasn't moving so
Hello
Turn off the power. Remove the accessory compartment located in front of the machine, if applicable.
Open the hook cover that shields the bobbin area. Please note that you do not need to remove the bobbin case.
Locate the drop feed lever near the bobbin case. Some machines have the lever towards the back of the free arm. Press down on the lever and then move it to the next notch or position. The raised metal feed dogs should be visible through the openings on the needle plate. You may need to rotate the big balance wheel one rotation to engage the mechanism on some machine models. The metal teeth will then spring up.
Close the hook cover. Insert the accessory compartment, if applicable.
Turn on the power. Try test stitching a piece of fabric. The raised feed dogs should help guide the fabric under the presser foot.
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