Trouble And Corrective Measures - Garudan anita GC-3317 Series User Manual

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28. TROUBLE AND CORRECTIVE MEASURES

Trouble Cause
Thread breakage 1. The thread path, needle point, hook point or bobbin case
(thread frays or positioning finger has scratches
wears out) 2. The needle thread tension is too high
3. The needle hits the hook points
4. The needle thread tension od too low
5. The thread take-up spring has an exceessively high
tension while it has an excessively small stroke
6. The timing between the needle and hook is too early or
late.
Stitch skipping 1. The clearance between the needle and the hook point is
too large
2. The timing between the needle and hook is too aerly or
late
3. the presser foot pressure is too low
4. The clearance between the top edge of the needle eylet
and the hook point is not correct
5. The size of the needle is wrong
Loose stitches 1. The thread has not been the passed the through notch of
the bobbin case tension spring
2. The thread path is poorly finished
3 The bobbin does not rotate smoothly
4.The bobbin thread tension is too low
5. The bobbin thread has been wound too tight
The thread slips off
1.The tension of the auxiliary thread tension controller is
the needle up on
too high - on controller is too high
being trimmed
2. The thread trimming timing is too early
3. The retuirning force of the thread take-up spring is too
high
The needle thread 1. The last stitch has been skipped (the clearance between
cannot be trimmed the needle and the hook is too large)
while the bobbin
thread can be
trimmed
Both needle and 1. The thread trimming timing os wrong
bobbin threads 2. The knife has been damaged
cannot be trimmed 3. The knife pressure is inadequate
4. The home position of the movable knife is inaccurate
5. The movable knife fails to work
6. The thread trimming solenoid fails to work
Thread cannot be 1. The thread trimming timing is wrong
trimmed sharply 2. The knife pressure is inadequate
3. The knife bledeisblunt
MP00100EN_170907
Coorective measures
1 Remove the scratches on the
hook point using a fine sand paper.
2. Properly adjust the needle
thread tension
3. See "13. Neelde-to-hook
relationship"
4. Properly adjust the needle
thread tension
5. Decrease the tension and
increase the stroke
6. See "13. Neelde-to-hook
relationship"
1.See "13. Neelde-to-hook
relationship"
2. See "13. Neelde-to-hook
relationship"
3. Increase the presser foot
pressure
4. See "13. Neelde-to-hook
relationship"
5. Replace the needle by one which
one grade thicker
1. Properly thread the bobbin case
2. Grind it using a fine sand paper
of a buff
3. Replace the bobbin or hook
4. Properly adjust the tension
5. Decrease the bobbin thread
winding tension
1. Descrease the tension
2. See "21. Adjust the thread
trimming cam"
3. See "9. Thread take- up spring
1.See "13. Neelde-to-hook
relationship"
1. See "21. Adjust the thread
trimming cam"
2. Replace the knife
3. Increase the knife pressure
4. See "21. Adjust the thread
trimming cam"
5. Check it by actuating it by hand
6. Check the motor solenoid for
proper operation
1. See "21. Adjust the thread
trimming cam"
2. Increase the knife pressure
3. Replace the knife
21