Brother International CS-100T/4000 Operation Manual - Page 62
The upper, thread breaks., The lower, thread is tangled, or breaks., The thread ten, sion is
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APPENDIX Symptom The upper thread breaks. The lower thread is tangled or breaks. The thread tension is incorrect. The fabric is wrinkled. Possible cause You have not inserted the needle properly. The area around the hole in the needle plate is scratched. The area around the hole in the presser foot is scratched. The bobbin case is scratched, or has a burr on it. You have not used a bobbin that has been designed for this machine. You have not wound the bobbin thread properly. The bobbin is scratched or does not turn smoothly. The thread is tangled. You have not used a bobbin that has been designed for this machine. Bobbin is set incorrectly. You have not threaded the upper thread properly. You have not wound the bobbin thread properly. You have not threaded the right combination of thread and needle for the fabric you are using. You have not attached the presserfoot holder properly. The thread tension is incorrect. You have not used a bobbin that has been designed for this machine. Bobbin is set incorrectly. You have not threaded the upper thread properly or fitted the bobbin properly. You have not fitted the spool properly. You have not used the right combination of fabric, thread and needle. The needle is bent or blunt. If you are sewing thin fabric, the stitch is too thick. The thread tension is incorrect. How to put it right Insert the needle properly. Replace the needle plate. Contact your retailer or the nearest authorised service center. Replace the presser foot. Contact your retailer or the nearest authorised service center. Replace the bobbin case. Contact your retailer or the nearest authorised service center. Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine. Wind the bobbin thread properly. Replace the bobbin. Remove the tangled thread and clean the bobbin case. Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine. Reset the bobbin thread correctly. Correct the upper threading. Wind the bobbin thread properly. Choose a thread and needle that are appropriate for the type of fabric. Attach the presser-foot holder properly. Adjust the tension of the upper thread. Incorrect bobbins will not work properly. Only use a bobbin that has been designed for this machine. Reset the bobbin thread correctly. Thread the upper thread and wind the bobbin thread properly. Fit the spool properly. Choose a thread and needle that are appropriate for the type of fabric. Replace the needle. Sew with stabiliser material under the fabric. Adjust the tension of the upper thread. Reference page 21 - - - page 11 page 11 - page 57 page 11 page 14, 15 page 16 page 11 page 20 page 25 page 29 page 11 page 14, 15 page 14, 15, 16 - page 20 page 21 page 31 page 29 60