US-EN
28
Maintenance
Trouble shooting 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 (3). (lower
number)
3.The thread is too thick for the needle. 3.Use a larger needle.
4.The needle is not inserted correctly.
4.Remove and reinsert the needle. (flat
side towards the back)
5.The thread has become wound
around the bobbin winder spindle (14).
5.Remove the bobbin (g) and unwind the
thread.
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 wrongly. 2.Check both bobbin (g) 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.Replace the needle.
3.The wrong size needle has been
used.
3.Choose a needle size to suit the thread
and fabric.
4.The wrong presser foot is installed.
4.Use the correct presser foot.
Needle breaks
1.The needle is damaged.
1.Replace the needle.
2.The needle is not correctly inserted.
2.Insert the needle correctly (flat side
towards the back)
3.Fabric too thick/ needle size wrong.
3.Choose a needle size to suit the thread
and fabric.
4.The wrong presser foot is attached.
4.Use the correct presser foot.
Loose stitches
1.The machine is not correctly threaded. 1.Thread the machine correctly.
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.Use a finer needle.
2.The stitch length is wrongly adjusted. 2.Check the thread tension.
3.Fabric puckers.
3.Use a backing for fine or stretchy
fabrics.
Uneven
stitches,
uneven feed
1.The thread is too weak.
1.Use stronger thread.
2.The bobbin case is wrongly threaded. 2.Rethread the bobbin case and insert
correctly.
3.Fabric has been pulled when sewing. 3.Do not pull on the fabric. It must be
automatically moved by the machine.
The machine is
noisy
1.The machine must be lubricated.
1.Lubricate as described.
2.Fluff or oil have collected on the hook
or needle bar.
2.Clean the hook and feed dog as
described.
3.Poor quality oil has been used.
3.Only use good quality sewing machine
oil.
4.The needle is damaged.
4.Replace the needle.
The machine
jams
Thread is caught in the hook.
Remove the upper thread and bobbin
case, turn the handwheel (21) backwards
and forwards by hand and remove the
thread remains. Lubricate as described.
Содержание SNM 33 C1
Страница 3: ...a b c d e f g h i j k m o p l n q r t s ...
Страница 4: ......