Brother International CV3440 Operation Manual - Page 31

English Chapter 7 TROUBLESHOOTING This sewing machine is designed for trouble-free operation. However, the following chart indicates trouble which may occur if basic adjustments are not made properly. Trouble 1. Does not feed 2. Needles break 3. Threads break 4. Skipped stitches 5. Stitches not uniform 6. Fabric puckers Cause Remedy Presser foot pressure too loose Turn the pressure adjustment screw clockwise to increase the presser foot pressure. (See page 11.) 1. Needles bent, or needle tip blunt Replace with new needle. (See page 12.) 2. Needles incorrectly installed Install needles correctly. (See page 12.) 3. Material pulled forcibly Do not press or pull material too hard when sewing. 1. Improper threading Thread correctly. (See pages 15-18, 20.) 2. Thread tangled Check spool pin, thread holders, etc., and remove tangled thread. 3. Thread tension too tight Adjust the thread tension. (See pages 11.) 4. Needles incorrectly installed Install needles correctly. (See page 12.) 5. Wrong needle used Use correct needle. 130/705H recommended (See page 12.) 1. Needle bent, or needle tip blunt Replace with new needle. (See page 12.) 2. Needle incorrectly installed Install needle correctly. (See page 12.) 3. Wrong needle used Use correct needle. 130/705H recommended (See page 12.) 4. Improper threading Thread correctly. (See pages 15-18, 20.) 5. Presser foot pressure too loose Turn the pressure adjustment screw clockwise to increase the presser foot pressure. (See page 11.) Thread tensions not adjusted properly Adjust the thread tension. (See pages 11.) 1. Thread tension too tight Decrease thread tension when sewing lightweight or fine material. (See pages 11.) 2. Improper threading or thread tangled Thread correctly. (See pages 15-18, 20.) 29