Brother International PR670E Operation Manual - Page 221
The upper thread is not threaded correctly.
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Symptom Probable Cause/Remedy The upper thread breaks. The needle is not correctly installed. • Correctly install the needle. The needle set screw is loose. • Use the Allen screw driver to tighten the needle set screw. The needle is bent or blunt. • Replace the needle with a new one. The area around the hole in the needle plate is damaged. Page p.79 p.79 p.30 p.79 * 1 Scratches/Burrs • Replace the needle plate. The needle is touching the needle plate. APPENDIX Symptom Probable Cause/Remedy The upper thread breaks. Sliding surface on hook is not smooth. There are burns on it. Page * 1 Hook race area The thread is loose in the hook area. • Remove the loose thread. If the thread is tangled in the hook, clean the hook. The play between the hook and the race is too much. The hook does not rotate smoothly. • Remove lint, clean and apply oil. The space between the hook stopper and the hook cannot be adjusted. The upper thread is not threaded correctly. p.210 * p.210 p.214 * * 1 Needle 2 Needle plate hole 3 Needle touching hole 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/Burrs • Replace the presser foot. Using a specialty thread like a metallic thread. • Slow down the machine sewing speed. p.116 p.50 • Pull the upper thread by hand from below the presser foot, and check that the thread moves smoothly. If the thread does not move smoothly, it is not correctly threaded. Un-thread the machine and re-thread the machine. Make sure the thread is correctly positioned in the needle bar thread guide. Upper thread is not positioned in upper or middle thread guide. • Make sure thread passes completely under upper and middle thread guide. There are knots or tangles in the thread. • Remove any knots or tangles. The upper thread tension is too high. • Decrease the upper thread tension. The lower thread tension is incorrect. The thread does not roll out of the bobbin case smoothly. • Adjust the lower thread tension. The bobbin case is damaged. • Replace the bobbin case with a new one. p.50 - p.103 p.102 p.30 7 219
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