Brother International NX-250 Users Manual - English - Page 104

Symptom Probable Cause Remedy Reference The upper thread was not threaded correctly (for example, the spool is not installed correctly, the spool cap is too big for the spool being used, or the thread has come out of the needle bar thread guide). Correct the upper threading. page 22 There are knots or tangles in the thread. Remove any knots or tangles. - The selected needle is not appropriate Select a needle that is appropriate for the thread being used. for the type of thread being used. page 30 The upper thread tension is too tight. Loosen the upper thread tension. page 46 The upper thread breaks. The thread is tangled, for example, in the bobbin case. The needle is bent or blunt. The needle is incorrectly installed. Remove the tangle thread. If the thread is tangled in the bobbin case, clean the race. Replace the needle. Correctly install the needle. page 100 page 32 The area around the hole in the Replace the needle plate. needle plate is scratched, or has a Contact your dealer or the nearest - burr on it. authorized service center. The area around the hole in the Replace the presser foot. presser foot is scratched, or has a Contact your dealer or the nearest - 4 burr on it. authorized service center. The bobbin case is scratched, or has a burr on it. Replace the bobbin case. Contact your dealer or the nearest authorized service center. - A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. page 16 The bobbin thread is incorrectly installed. Correctly install the bobbin thread. page 20 The lower thread is tangled or breaks. The bobbin is scratched or does not rotate smoothly, or has a burr on it. The thread is tangled. Replace the bobbin. Remove the tangled thread and clean the race. - page 100 A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. page 16 The upper thread was not threaded correctly. Correct the upper threading. page 22 The bobbin thread is incorrectly installed. Correctly install the bobbin thread. page 20 The thread tension is incorrect. The combination of fabric, thread and needle is not correct. The presser foot holder is incorrectly installed. Select a thread and needle that are appropriate for the type of fabric being sewn. Correctly install the presser foot holder. page 30 page 35 The thread tension is incorrect. Adjust the tension of the upper thread. page 46 A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. page 16 Troubleshooting 103