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APPENDIX
181
5
The upper thread breaks.
The needle is not correctly installed. 176
The needle set screw is loose. 176
The needle is bent or blunt. 176
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 embroidery speed.
89
Symptom
Probable Cause/Remedy Page
Sliding surface on hook is not smooth. There are
burns on it.
1 Hook race area
*
The thread is loose in the hook area. 173
The play between the hook and the race is too
much.
*
The hook does not rotate smoothly.
• Remove lint, clean and apply oil.
173, 178
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.
82
Upper thread is not positioned in upper or middle
thread guide.
• Make sure thread passes completely under
upper and middle thread guide.
82
There are knots or tangles in the thread.
• Remove any knots or tangles.
—
The upper thread tension is too high. 118
The bobbin thread tension is incorrect.
The thread does not roll out of the bobbin case
smoothly.
116
The bobbin case is damaged.
• Replace the bobbin case with a new one.
33
The bobbin thread is not wound correctly.
• Check that the bobbin is wound so that it is
about 80% full and that the thread is evenly
wound. If the bobbin is not correctly wound,
replace the bobbin with one that is correctly
wound or rewind the bobbin.
33
Symptom
Probable Cause/Remedy Page
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