Trouble Shooting Guide - Singer 3820 Instruction Manual

D Trouble shooting guide
Problem
Upper thread breaks
Skipped stitches
Needle breaks
Loose stitches
Seams gather or pucker
Uneven stitches, uneven feed
The machine is noisy
The machine jams
Cause
1. The
2. The
3. The
4. The
5. The
6. The
machine is not threaded correctly
thread tension is too tight
thread is too thick for the needle
needle is not inserted correctly
thread is wound around the spool holder pin
needle is damaged
1. The needle is not inserted correctly
2. The needle is damaged
3. The wrong size needle has been used
4. The foot is not attached correctly
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. 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. The needle is too thick for the fabric
2. The stitch length is wrongly adjusted
3. The thread tension is too tight
1. Poor quality thread
2. The bobbin case is wrongly threaded
3. Fabric has been pulled
1. The machine must be lubricated
2. Fluff or oil have collected on the hook or needle bar
3. Poor quality oil has been used
4. The needle is damaged
1. Thread is caught in the hook
Correction
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 spool and wind thread onto thread spool
6. Replace the needle
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
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
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
1. Select a finer needle
2. Readjust the stitch length
3. Loosen the thread tension
1. Select a better quality thread
2. Remove bobbin and rethread and insert correctly
3. Do not pull on the fabric while sewing, let it be fed by the machine
1. Take machine to dealer for proper servicing
2. Clean the hook and feed dog as described
3. Take machine to dealer for proper cleaning and servicing
4. Replace the needle
1. Remove the upper thread and bobbin, gently turn the handwheel
backwards and forwards by hand and remove the thread remnants.
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