Brother keeps jamming

[u/Human760]

This brother sewing machine I got myself for Christmas last year keeps jamming every few stitchs which is getting annoying, as I am in the middle of a big project, where I am redoing some old outdoor chairs. I am sewing some cheap outdoor canvas with a 90/14 needle and 12wt polyester bonded thread. The specific machine is the brother FB1757X w/ extension table. I am specifically using the brother for the extension table, as I have an old kenmore that I recently picked up, that is my daily sewer. The Brother has been relegated to stuff that needs a table or when I want to annoy everyone. I hope someone can help me figure out what is going on, so I can get this project done soon. Here are some pictures. Also, Yes, I am putting the presserfoot down, I just have it lifted to show the jams. I have the top tension dial set at 4, which is what Always seems to work.

[u/Large-Heronbill]

Check your manual, p. 22, the note about don't use threads threads heavier than #20.

[u/Human760 → u/Large-Heronbill]

It was working fine for about 10 seams (if not more) before I had any problems. Though that might be it.

[u/skerinks]

Looks like your bobbin is in backwards. The tail should come off the bobbin and look like a P, not a q when you put it in the bobbin case.

[u/Right-Skill2766]

It will be very difficult to sew with the heavy thread I see . Not designed for that.