18. Troubleshooting
18. Troubleshooting
Problem
Cause |
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Remedy | Page |
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Button clamp does not rise.
Button clamp does not drop.
Button clamp lift amount is incorrect.
Thread wiper does not operate correctly.
Lower thread winds to one side.
Lower thread winding amount is incorrect.
Threads comes unthreaded.
Button clamp lifter amount is too great.
Presser is contacting thread wiper.
Presser lifter link is not moving back.
Incorrect position of button clamp holder hook assembly
The thread wiper is obstructing the needle.
Thread wiper position is incorrect.
Bobbin winder thread tension stud height is incorrect.
Bobbin presser position is incorrect.
Stitches being skipped at the sewing start.
Uneven upper thread length.
Distance between button clamp and top of needle plate
Thread wiper standby position
Link return spring is unhooked.
Distance between button clamp and top of needle plate
Clearance between thread wiper and needle tip
Thread wiper position
Bobbin winder thread tension stud height
Thread winding amount
Refer to "Skipped stitches occur".
Upper thread length
| Adjust the height of the | 46 |
| button clamp to within | |
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| 13 mm. |
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| Adjust the position of | 48 |
| the thread wiper. | |
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| Hook the link return |
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| spring properly. |
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| Adjust the button | 46 |
| clamp lift amount. | |
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| Adjust the height of the | 48 |
| thread wiper. | |
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| Adjust the operating | 48 |
| distance of the thread | |
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| wiper. |
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| Adjust the height of the | 29 |
| thread tension stud. | |
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| Adjust the position of | 29 |
| the bobbin presser. | |
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| Refer to "Skipped |
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| stitches occur". |
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| Adjust the | 29 |
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