How can I factory reset my PFAFF 7550 sewing machine ?

SOURCE: Bobbin thread breaks

Make sure your bobbin thread is turning clockwise as it sits in the bobbin case. There is a screw on the outside of the bobbin case you can turn with your thumb slightly to adjust tension. If you dangle the case from the thread and give it a light ****, it should move down slightly when doing so-an indicator of good bobbin tension.

SOURCE: Pfaff sewing machine 463

how do you thread a Pfaff sewing machine

SOURCE: thread shreds with Pfaff

I have the book on that machine as well and I have had that problem. Here is what had happened to me: I was soooooo tired of that shreading thing that I took a flashlight and aimed it up the nose of the machine by the lightbulb and fould there to be a nice little rats nest wrapped around the take-up lever and the needle bar. I spent the next three hours getting to that nest with the skinniest and longest tools I could find. Oh it is was fun!

SOURCE: Bottom (bobbin thread) makes loops

I don't have the same brand as yours, but on my machine there is a little screw on the bobbin case that you tighten to increase the bobbin tension. If you've got one, turn it 1/8 to 1/4 turn at a time.

SOURCE: My Pfaff sewing machine has started to loop the

If the thread is looping underneath, you're top tension may be too loose or the thread may not be in the take-up lever. If it's looping on top, double check that the thread is in the bobbin tension or that the bobbin tension isn't too loose.