The bobbin thread is looping. I have changed the needle

Hi, my name is ***** ***** I have been in the repair field for over 20 years. I am sorry you are having issues with your Janome bobbin thread. I will be glad to help you today.

I'm happy to help you decide if you need to get your appliance professionally repaired or if you can manage the repair yourself. However, sometimes it takes me time to type out a more extended response; please be patient!

You will remove your needle -plate, bobbin, and bobbin case and clean that area out entirely of any excess thread, lint, or debris. You can do this with your brush or use a tweezer. Next, place a drop of sewing machine oil in the center of your shuttle (metal piece holding bobbin and bobbin case).

Reassemble your bobbin area.

Unthread your machine and raise your presser foot to open your tension discs.

Take a scrap piece of material and run it through your top tension back and forth in the pathway of the threading. Cleaning will remove any lint, debris, or extra thread you have that does not allow your top tension to close correctly.

Now rethread the machine, making sure you correctly take up the lever and top tension through your guides. Before you go through your needle, keep gently pulling your thread while lowering your foot. You should feel the top tension beginning to grab your thread. If not, you are in front of or behind your tension discs, so rethread it again.

If that does not work, there may be a thread around the take-up area. Next, remove the faceplate (cover on the upper left end of the machine).

Inside there, you will see the connecting mechanism for the thread take-up. There will probably be a thread wrapped around that to remove the mechanism and lubricate.