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Please have a trained service technician look at your machine. Cutter blades and mechanisms do require service from time to time, especially with heavy use. If you use your machine frequently, have it cleaned and adjusted based on your use levels.
San Diego, CA
The cutter mechanism connects to the machine whet the front is closed. If you look at the machine with the door open. You will see a finger coming out of the inside of the machine. If you turn the hand wheel it should move up and down. On the cutter mechanism there is a fork that fits over the finger. When it is all closed up it sould work together to move the cutter blade up an down. Is the cutter in the up position?
Recording how it fits together before starting is a good idea. Drawing a picture is another method including plenty of detail such as colours. It once made all the difference when reconnecting the hydraulics on a truck. If you feel confident, you could re-try different combinations or have an electrician check it
That is your thread cutter. Depending on what machine you have, whether it is automatic thread cutter on an arm or just a manual one. If it is automatic, pop the cover off on the left top of machine next to the bobbin area. The arm should be seen there. It moves like an elbow. Push your thread cutter (scissor button) and watch how it works to see if it has come off the post. If you don't have automatic thread cutter, perhaps the thread cutter is not pushed all the way back in its place. The thread cutter looks like a triangular piece of flat razor. It could be sticking out too far or perhaps bent. I have fixed mine before, but be careful.
No real idea what has gone wrong, but first thing I would do would be to clean out the bobbin area thoroughly. There may well be a piece of lint stuck in there that is preventing the mechanism from operating. Is the cutter not working manually i.e. when you touch the cutter button, or not working at thread changes in embroidery? If it in the manual situation you might find that the button is not connecting with the electronics behind that panel correctly and it will need a machine technician to correct it.
Does the metal arm come out to grab the threads to cut it? Is there a blade in the metal arm that cuts the tread? I think a standard utility knife cutter blade is the same size (just like the one that cuts the bobbin thread when you put in a new bobbin). What happens when you activate the cutter is the arm comes out, grabs the threads, brings them to the blade which cuts the threads, the velcro by the cutter holds the bobbin thread in place for the next stitch. Otherwise the thread may end up on top and the top thread would not be able to pick it up for the next stitch.