Brother International Innov-is 4750D Operation Manual - Page 252

TROUBLESHOOTING TROUBLESHOOTING If you have a minor problem with your sewing machine, check the following solutions. If the solutions suggested do not correct the problem, contact your authorized dealer. You can also press then for advice about minor sewing problems during sewing. Press the original screen. at any time to return to Problem Cause Solution Page Upper thread breaks Machine is not threaded correctly (used the Rethread the machine correctly. 29 wrong spool cap, spool cap is loose, the thread did not catch the needle bar threader, etc.) Thread is knotted or tangled. Rethread upper and lower thread. 26, 29 Thread is too thick for the needle. Check needle and thread combinations. 41 Upper thread tension is too strong. Adjust the thread tension. 50, 174 Thread is twisted. Use scissors, etc., to cut the twisted thread - and remove it from the race, etc. Needle is turned, bent or the point is dull. Replace the needle. 39 Needle is installed incorrectly. Reinstall the needle correctly. 39 There are scratches near the hole of the needle Replace the needle plate, or consult your 65 plate. authorized dealer. There are scratches near the hole in the presser Replace the presser foot, or consult your 37 foot. authorized dealer. There are scratches on the race. Replace the race, or consult your authorized 236 dealer. Bobbin thread breaks Bobbin is set incorrectly. Reset the bobbin thread correctly. 26 There are scratches on the bobbin or it doesn't Replace the bobbin. 26 rotate properly. Thread is twisted. Use scissors, etc. to cut the twisted thread - and remove it from the race, etc. Skipped stitches Machine is threaded incorrectly. Check the steps for threading the machine 29 and rethread it correctly. Using improper needle or thread for the Check the "Fabric/Thread/Needle 41 selected fabric. Combination" chart. Needle is turned, bent or the point is dull. Replace the needle. 39 Needle is installed incorrectly. Reinstall the needle correctly. 39 Needle is defective. Replace the needle. 39 Dust or lint has collected under the needle plate. Remove the dust or lint with the brush. 236 Fabric puckers There is a mistake in the upper or bobbin threading. Check the steps for threading the machine and rethread it correctly. 26, 29 Spool cap is set incorrectly. Check the method for attaching the spool cap, 29 then reattach the spool cap. Using improper needle or thread for the Check the "Fabric/Thread/Needle 41 selected fabric. Combination" chart. Needle is turned, bent or the point is dull. Replace the needle. 39 Stitches are too long when sewing thin fabrics. Shorten the stitch length. 49 Thread tension is set incorrectly. Adjust the thread tension. 50, 174 Wrong presser foot. Use the correct presser foot. "STITCH SETTING CHART" High-pitched sound Dust or lint is caught in the feed dogs. Remove the dust or lint. 236 while sewing Pieces of thread are caught in the race. Clean the race. 236 Upper threading is incorrect. Check the steps for threading the machine 29 and rethread the machine. There are scratches on the race. Replace the race, or consult your authorized 236 dealer. Cannot thread the needle Needle is not in the correct position. Press the "Needle Position" button to raise the 3 needle. Threading hook does not pass through the eye Press the "Needle Position" button to raise the 3 of the needle. needle. Needle is installed incorrectly. Reinstall the needle correctly. 39 240