Brother International PR670E Operation Manual - Page 220

Symptom Probable Cause/Remedy The needle breaks. The needle hits/touches the needle plate. Page p.79 * 1 Needle 2 Hole in needle plate 3 Needle hits hole • Replace the needle. The presser foot is set too high and not correctly positioned. * The needle hits/touches the presser foot. The area around the embroidery foot hole is damaged. * 1 Scratches or Burrs • Replace the presser foot. Sliding surface on hook race is not smooth. There are scratches or burrs on it. * 1 Hook race area The bobbin or bobbin case are not correctly installed. p.33 • Remove and reinstall bobbin and bobbin p.34 case. The hook is not correctly installed. * The hook stopper is not correctly installed, the hook is making a complete rotation. * Symptom Probable Cause/Remedy Page The needle breaks. The upper thread is not threaded correctly. The upper thread is catching somewhere. • Pull the upper thread by hand from below the presser foot, and check that the thread moves smoothly. If the thread does not move, it is p.50 not threaded correctly. Thread the upper thread correctly. Make sure the thread is caught by the needle bar thread guide. The upper thread tension is set too high. It does not run. • Decrease the upper thread tension and make p.103 sure tension disc rotates when pulling on thread. A bobbin designed specifically for this machine is not used. p.30 • Use the correct bobbin. The needle and the hook are not correctly passing each other. * • Hook timing may be OFF. There is backlash play (forward/backward) in the needle bar case. * The thread density of the embroidery data is too fine. Three or more overlapping stitches are being sewn. p.123 • Using a data design system, correct the thread density and overstitching settings in the embroidery data. The thread is not cut automatically. Lint or dust has accumulated around the needle plate (moving knife, fixed knife or thread retaining plate). p.211 • Remove any lint or dust around the needle plate. A bobbin case designed specifically for this machine is not used. - • Use the correct bobbin case. Lint or dust has accumulated in the thread tension disc. • Remove the tension dials, and then remove p.213 any lint or dust accumulated between the felt washers. After the threads are automatically cut, the upper thread is too short and comes out of the needle. Lint or dust has accumulated around the needle plate (moving knife, fixed knife or thread retaining plate). p.211 • Remove any lint or dust around the needle plate. 218