typical GC6-6, Instruction Book

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8.Trouble shooting
Trouble Possible causes Remedy
Needle
breaking
Skip
stitch
Needle
thread
breaking
Bobbin
thread
breaking
Loose
stitch
Puckering
1. Needle too thin or bent.
2. Wrong set of needle.
3. Push or pull the material
with hand while sewing.
4. Too heavy the weight of
sewing material.
1. Needle bent or needle
number is not fitted the
weight of material.
2. Wrong set of needle.
1. Wrong needle threading.
2. Needle thread tension too
strong.
3. Poor thread.
4. Needle too thin or too
rough.
1. Too strong the bobbin
thread tension.
2. Thread wound on bobbin
flabbily and uneven.
3. Needle hole of throat
plate too rough or have
worn.
1. Unsuitable adjust of
needle thread tension and
bobbin thread tension .
2. Too weak the tension on
thread take-up spring.
1. Too light the weight of
material and too long the
stitch length.
2. Too strong the thread
tension on needle and
bobbin.
3. Too strong the pressure
on presser foot.
Change the needle with new
one.
Refer to the section 4.3.
Support the material gently
with hand while sewing.
Sewing according to the
technical specification
Change the needle.
Refer to the section 4.3.
Refer to the section 4.5.
Refer to the section 5.3.
Change the thread.
Change the needle.
Weaken the bobbin thread
tension.
Wind the bobbin again.
Change throat plate or
polish needle hole with
#O emery cloth.
Readjust the needle
thread tension and bobbin
thread tension.
Adjust thread take-up
spring as section 5.1.1.
Adjust suitably.
Adjust tension regulating
thumb nut, thread take-up
spring and bobbin case
tension spring screw.
Loosen pressure regulating
thumb screw.