Brother International Innov-is 40 Operation Manual - Page 96
Symptom, Probable Cause, Remedy, Reference
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APPENDIX Symptom Probable Cause Remedy Reference The upper thread was incorrectly threaded (for example, the spool is incorrectly installed or the thread has come out of the needle bar thread guide). Correct the upper threading. page 20 There are knots or tangles in the thread. Remove any knots or tangles. - The selected needle is not Select a needle that is appropriate for appropriate for the thread being used. the type of stitch being used. page 28 The upper thread tension is too tight. Loosen the upper thread tension. page 47 The thread is tangled, for example, in the bobbin case. Remove the tangled thread. If the thread is tangled in the bobbin case, clean the race. page 91 The upper thread The needle is bent or blunt. breaks. The needle is incorrectly installed. Replace the needle with a new one. page 29 Correctly install the needle. page 29 The area around the hole in the needle plate is scratched. Replace the needle plate. Contact your dealer or the nearest - authorized service center. The area around the hole in the presser foot is scratched. Replace the presser foot. Contact your dealer or the nearest - authorized service center. The bobbin case is scratched. Replace the bobbin case. Contact your dealer or the nearest - authorized service center. A bobbin designed specifically for this machine is not used. Bobbins from older models, which have a different thickness, will not work properly. Only use a bobbin designed specifically for this machine. page 15 The bobbin thread is incorrectly installed. Correct the bobbin threading. page 18 The bobbin thread is incorrectly wound. Correctly wind the bobbin. page 15 The lower thread is tangled or breaks. There are scratches on the bobbin or it doesn't rotate properly. The thread is tangled. Replace the bobbin. Remove the tangled thread and clean the race. - page 91 A bobbin designed specifically for this machine is not used. Bobbins from older models, which have a different thickness, will not work properly. Only use a bobbin designed specifically for this machine. page 15 94