50
Trouble
Cause
Countermeasure
Page
Needle
keeps
breaking
Needle incorrectly inserted
into the machine
Insert the needle correctly
26
The needle clamp screw is
loose
Firmly tighten the screw
26
The needle is too fine for the
fabric
Use the appropriate size
needle for the fabric
27
The upper thread tension is
too tight
Loosen the upper tension
33
The bobbin case is not in the
correct position
Put the bobbin case in the
correct position
44
Upper thread
keeps
Breaking
Machine is incorrectly
threaded
Rethread the sewing machine
16-19
The thread is tangled in the
bobbin case or rotary hook
Remove the thread tangle and
clean the feed dog and rotary
hook
42
The upper thread tension is
too tight
Loosen the upper tension
33
The needle is bent or the
needle point is burred
Insert a new needle
26
The needle is incorrectly
inserted
Insert the needle correctly
26
The thread is a poor quality
thread
Use a good quality,
recommended thread
ʊ
Lower
thread keeps
breaking
Lower thread is incorrectly
threaded
Rethread the bobbin case
16, 17
Fabric not
feeding
through the
machine
The feed dog is dirty
Remove any lint and fluff from
the feed dog
42
Pattern selection dial set to
a buttonhole number – “2”
or “4”
Reset the stitch selection dial
to the desired stitch
23
Missed
stitches
The needle is incorrectly
inserted
Insert the needle correctly
26
The needle is bent
Use a straight needle
26
Needle and thread not
suitable for the fabric
Use the correct needle and
thread for the fabric
27
Incorrect upper threading
Rethread the upper thread
correctly
18, 19
Содержание SP100 Series
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