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* All = Conventional and Embroidery sewing
Troubl_hooting
Problem
The machine is
noisy.
The needle
thread breaks.
The bobbin
thread breaks.
The needle
breaks.
Type of
Sewing
All
All
All
All
All
All
All
All
Conventional
Embroidery
All
All
MI
All
All
All
All
All
Conventional
Cause
(_) Threads have been caught in the hook
mechanism.
(_) The feed dogs are packed with lint.
(_) Slight humming sound coming from internal
motor.
@) The needle thread is not threaded properly.
@ The needle thread tension is too tight.
(_) The needle is bent or blunt.
@ The needle is inserted incorrectly.
(_) The thread is too heavy for the needle.
(_) The needle thread and the bobbin thread are
not set properly under (drawn to the rear of
the presser foot when starting to sew).
(_) The needle thread is not set in the thread
holder when embroidery sewing is started.
(D The bobbin thread is not threaded properly in
the bobbin holder.
(_) Lint has collected in the bobbin holder.
(_) The bobbin is damaged and doesn't turn
smoothly.
(_) The needle is incorrectly inserted.
(_) The needle is bent or blunt.
(_) The needle clamp screw is loose.
(_) The needle thread tension is too tight.
(_) The fabric is not drawn to the rear when
sewing is finished.
(_) The needle is too fine for the fabric being
sewn,
Reference
See pages 98, 100.
See pages 98, I00.
Notabnormal
See pages 12-18.
See page 26.
See page 10.
See page 10.
See page 22.
See page 18.
See page 74.
See page 14.
See page 100.
Replace bobbin.
See page 10.
See page 10.
See page 10.
See page 26.
See page 32.
See page 22.
102