Brother International SB3734T Operation Manual - Page 28

Chapter 6 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 are not uniform 6. Fabric is puckered Cause Remedy Presser foot pressure too loose Turn the pressure adjustment screw clockwise to increase the presser foot pressure. (See page 9.) 1. Needles bent, or needle tip blunt Replace with new needle. (See page 13.) 2. Needles incorrectly installed Install needles correctly. (See page 13.) 3. Material pulled forcibly Do not press or pull material too hard when sewing. 1. Improper threading Thread correctly. (See pages 15-18.) 2. Thread tangled Check spool pin, thread holders, etc. and remove tangled thread. 3. Thread tension too tight Adjust the thread tension. (See pages 10-12.) 4. Needles incorrectly installed Install needles correctly. (See page 13.) 5. Wrong needle used Use correct needle. 130/705H - suggested (See page 13.) 1. Needle bent, or needle tip blunt Replace with new needle. (See page 13.) 2. Needle incorrectly installed Install needle correctly. (See page 13.) 3. Wrong needle used Use correct needle. 130/705H - suggested (See page 13.) 4. Improper threading Thread correctly. (See pages 15-18.) 5. Presser foot pressure too loose Turn the pressure adjustment screw clockwise to increase the presser foot pressure. (See page 9.) Thread tensions are not adjusted Adjust the thread tension. properly (See pages 10-12.) 1. Thread tension too tight Decrease thread tension when sewing lightweight or fine material. (See pages 10-12.) 2. Improper threading or thread tangled Thread correctly. (See pages 15-18.) 26