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APPENDIX
219
7
The upper thread breaks.
The needle is not correctly installed.
• Correctly install the needle.
p.79
The needle set screw is loose.
• Use the Allen screw driver to tighten the
needle set screw.
p.79
The needle is bent or blunt.
• Replace the needle with a new one.
p.30
p.79
The area around the hole in the needle plate is
damaged.
1 Scratches/Burrs
• Replace the needle plate.
*
The needle is touching the needle plate.
1 Needle
2 Needle plate hole
3 Needle touching hole
*
The presser foot is set too high and not correctly
positioned.
The needle hits/touches the presser foot.
*
The area around the embroidery foot hole is
damaged.
1 Scratches/Burrs
• Replace the presser foot.
*
Using a specialty thread like a metallic thread.
• Slow down the machine sewing speed.
p.116
Symptom
Probable Cause/Remedy Page
The upper thread breaks.
Sliding surface on hook is not smooth. There
are burns on it.
1 Hook race area
*
The thread is loose in the hook area.
• Remove the loose thread. If the thread is
tangled in the hook, clean the hook.
p.210
The play between the hook and the race is too
much.
*
The hook does not rotate smoothly.
• Remove lint, clean and apply oil.
p.210
p.214
The space between the hook stopper and the
hook cannot be adjusted.
*
The upper thread is not threaded correctly.
• Pull the upper thread by hand from below the
presser foot, and check that the thread moves
smoothly. If the thread does not move
smoothly, it is not correctly threaded.
Un-thread the machine and
re-thread the machine.
Make sure the thread is correctly positioned
in the needle bar thread guide.
p.50
Upper thread is not positioned in upper or
middle thread guide.
• Make sure thread passes completely under
upper and middle thread guide.
p.50
There are knots or tangles in the thread.
• Remove any knots or tangles.
–
The upper thread tension is too high.
• Decrease the upper thread tension.
p.103
The lower thread tension is incorrect.
The thread does not roll out of the bobbin case
smoothly.
• Adjust the lower thread tension.
p.102
The bobbin case is damaged.
• Replace the bobbin case with a new one.
p.30
Symptom
Probable Cause/Remedy Page
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