Brother International SB8000 Operation Manual - Page 202
The fabric feeds
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APPENDIX Symptom Probable Cause Remedy While winding the bobbin, the bobbin thread was wound below the bobbin winder seat. You have not wound the bobbin thread properly. After removing the thread wound below the bobbin winder seat, wind the bobbin correctly. Bobbin thread does not wind neatly on the bobbin. The thread is not passed through the bobbin-winding thread guide correctly. Bobbin spins slowly. The thread that was pulled out was not wound onto the bobbin correctly. Correctly pass the thread through the bobbin-winding thread guide. Move the sewing speed controller to the right (so that the speed will be fast). Wind the thread that was pulled off round the bobbin five or six times clockwise. Fabric being sewn with the machine cannot be removed. Thread is tangled below the needle plate. Lift up the fabric and cut the threads below it, and clean the race. The fabric feeds in the opposite The feed mechanism is damaged. direction. Contact your dealer or the nearest authorized service center. The upper thread The bobbin thread is incorrectly has tightened up. installed. Correctly install the bobbin thread. The thread is tangled on the wrong side of the fabric. You have not threaded the upper thread properly. Correct the upper threading. Reference page 193 page 27 page 28 page 28 page 190 - page 29, page 186 page 32, page 187 200