For Technical Assistance Please Call Toll Free 1-877-4BROTHER The first thing you want to check before you go through any adjustments is to see if the knives are really out of position. You will need to remove the needle plate to look. They should look like the photo below with the moving knife protruding out from the fixed knife about 1mm.
After you have checked and adjusted, if necessary, the fixed knife. Now we can check the moving knife. The tip of the moving knife should protrude past the edge of the fixed knife 1 mm as illustrated by the photo below. If you find the moving knife needs to be adjusted.
Once you have the cover removed you will be able to access the adjustment screws for the moving knife. Loosen the screws as indicated in the photo below and move the moving knife with your fingers until you get it 1 mm from the edge of the fixed knife. Re-tighten your adjustment screws and press the thread-trimming button on the machine and re-check the adjustment.