Singer M3330 User Manual - Page 35

Troubleshooting Guide

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Troubleshooting Guide Problem Cause Correction Upper thread breaks 1. The machine is not threaded correctly. 2. The thread tension is too tight. 3. The thread is too thick for the needle. 4. The needle is not inserted correctly. 5. The thread is wound around the spool holder pin. 6. The needle is damaged. 1. Rethread the machine. 2. Reduce the thread tension. (lower number) 3. Select a larger needle. 4. Remove and reinsert the needle. (flat side towards the back) 5. Remove the reel and wind thread onto reel. 6. Replace the needle. Lower thread breaks 1. The bobbin case is not inserted correctly. 2. The bobbin case is threaded wrong. 1. Remove and reinsert the bobbin case and pull on the thread. The thread should pull easily. 2. Check both bobbin and bobbin case. Skipped stitches 1. The needle is not inserted correctly. 2. The needle is damaged. 3. The wrong size or type of needle has been used. 4. The foot is not attached correctly. 1. Remove and reinsert needle. (flat side towards the back) 2. Insert a new needle. 3. Choose a needle to suit the thread and fabric. 4. Check and attach correctly. Needle breaks 1. The needle is damaged. 2. The needle is not correctly inserted. 3. Wrong needle size for the fabric. 4. The wrong foot is attached. 1. Insert a new needle. 2. Insert the needle correctly. (flat side towards the back) 3. Choose a needle to suit the thread and fabric. 4. Select the correct foot. Loose stitches 1. The machine is not correctly threaded. 2. The bobbin case is not correctly threaded. 3. Needle/ fabric/ thread combination is wrong. 4. Thread tension wrong. 1. Check the threading. 2. Thread the bobbin case as illustrated. 3. The needle size must suit the fabric and thread. 4. Correct the thread tension. Seams gather or pucker 1. The needle is too thick for the fabric. 2. The stitch length is incorrectly adjusted. 3. The thread tension is too tight. 1. Select a finer needle. 2. Readjust the stitch length. 3. Loosen the thread tension. Uneven stitches, uneven feed 1. Poor quality thread. 2. The bobbin case is incorrectly threaded. 3. Fabric has been pulled. 1. Select a better quality thread. 2. Remove bobbin case, thread and insert correctly. 3. Do not pull on the fabric while sewing, let it be drawn through by the machine. The machine is noisy 1. Lint or oil have collected on the hook or needlebar. 1. Clean the hook and feed teeth as described. 2. The needle is damaged. 2. Replace the needle. The machine jams Thread is caught in the hook. Remove the upper thread and bobbin case, turn the handwheel backwards and forwards by hand and remove the thread. 28

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Troubleshooting Guide
Problem
Cause
Correction
Upper thread breaks
1. The machine is not threaded correctly.
1. Rethread the machine.
2. The thread tension is too tight.
2. Reduce the thread tension. (lower number)
3. The thread is too thick for the needle.
3. Select a larger needle.
4. The needle is not inserted correctly.
4. Remove and reinsert the needle. (flat side towards the back)
5. The thread is wound around the spool holder pin.
5. Remove the reel and wind thread onto reel.
6. The needle is damaged.
6. Replace the needle.
Lower thread breaks
1. The bobbin case is not inserted correctly.
1. Remove and reinsert the bobbin case and pull on the thread.
The thread should pull easily.
2. The bobbin case is threaded wrong.
2. Check both bobbin and bobbin case.
Skipped stitches
1. The needle is not inserted correctly.
1. Remove and reinsert needle. (flat side towards the back)
2. The needle is damaged.
2. Insert a new needle.
3. The wrong size or type of needle has been used.
3. Choose a needle to suit the thread and fabric.
4. The foot is not attached correctly.
4. Check and attach correctly.
Needle breaks
1. The needle is damaged.
1. Insert a new needle.
2. The needle is not correctly inserted.
2. Insert the needle correctly. (flat side towards the back)
3. Wrong needle size for the fabric.
3. Choose a needle to suit the thread and fabric.
4. The wrong foot is attached.
4. Select the correct foot.
Loose stitches
1. The machine is not correctly threaded.
1. Check the threading.
2. The bobbin case is not correctly threaded.
2. Thread the bobbin case as illustrated.
3. Needle/ fabric/ thread combination is wrong.
3. The needle size must suit the fabric and thread.
4. Thread tension wrong.
4. Correct the thread tension.
Seams gather or
pucker
1. The needle is too thick for the fabric.
1. Select a finer needle.
2. The stitch length is incorrectly adjusted.
2. Readjust the stitch length.
3. The thread tension is too tight.
3. Loosen the thread tension.
Uneven stitches,
uneven feed
1. Poor quality thread.
1. Select a better quality thread.
2. The bobbin case is incorrectly threaded.
2. Remove bobbin case, thread and insert correctly.
3. Fabric has been pulled.
3. Do not pull on the fabric while sewing, let it be drawn through
by the machine.
The machine is
noisy
1. Lint or oil have collected on the hook or needlebar.
1. Clean the hook and feed teeth as described.
2. The needle is damaged.
2. Replace the needle.
The machine jams
Thread is caught in the hook.
Remove the upper thread and bobbin case, turn the handwheel
backwards and forwards by hand and remove the thread.