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Problem Cause Correction
Seam puckering
1.The needle thread tension is too tight. 1. Loosen the thread tension.
2.The needle thread is not threaded correctly. 2. Rethread the machine.
3.The needle is too heavy for the fabric being sewn.
3. Choose a needle to suit the thread and
fabric.
4.The stitch length is too long for the fabric. 4. Shorten stitch length.
5.The presser foot pressure is not correctly adjusted. 5. Decrease the presser foot pressure.
Patterns are
distorted
1.The correct presser foot is not used. 1. Select the correct foot.
2.The needle thread tension is too tight. 2. Loosen the thread tension.
The machine
jams
1.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 and lint.
2.The feed dogs are packed with lint.
The machine is
noisy
1.Lint or oil have collected on the hook or needle bar. 1.Clean the hook and feed dog as described.
2.Poor quality oil has been used. 2.Only use good quality sewing machine oil.
3.The needle is damaged. 3.Replace the needle.
4.Humming sound coming from internal motor. 4.Normal.
5.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 and lint.
6.The feed dogs are packed with lint.
Uneven stitches,
uneven feed
1.Poor quality thread. 1.Select a better quality thread.
2.The bobbin case is threaded wrong.
2.Remove the bobbin case, the thread and
reinsert correctly.
3.Fabric has been pulled.
3.Do not pull on the fabric while sewing, let it
be fed by the feed dogs.
The sewing
machine does
not operate
1.The machine is not turned on. 1.Turn on the machine.
2.The presser foot lever is raised. 2.Lower the presser foot lever.
3.The machine is not plugged in.
3.Connect the power line plug to the electric
outlet.