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| 12. TROUBLESHOOTING | |
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| Problem | Cause | Remedy | Reference |
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| Lower thread winds to | Height of bobbin winder tension | Adjust the height of the bobbin winder | P. 24 |
| one side. | assembly is incorrect. | tension assembly. | |
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| Lower thread winding | Bobbin presser position is incorrect. | Adjust the position of the bobbin | P. 24 |
| amount is incorrect. | presser. | ||
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| Needle is too thick. | Select a needle that is suitable for the | P. 26 |
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| sewing conditions. | ||
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| When threading the thread through the |
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| needle, allow a distance of | P. 22 |
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| approximately 40 mm between the | |
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| Thread unraveling at | Upper thread trailing length is too short. | needle hole and the end of the thread. |
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| Adjust the |
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| sewing start. |
| upper thread trailing length after thread | P. 26 |
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| trimming is approximately 40 mm. |
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| Amount of lower thread being fed out | Set the feeding amount to | P. 25 |
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| from bobbin is too small. | approximately 30 mm. | |
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| Sewing start speed is too fast. | Adjust the sewing start speed. | P. 32 |
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| Rotary hook tip is missing. | Replace the part. |
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| Needle is too thin. | Select a needle that is suitable for the |
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| P. 26 | |
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| Needle is too thick. | sewing conditions. | |
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| Needle is bent. | Replace the needle. | P. 22 |
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| Needle is not installed correctly. | Install the needle so that it faces | P. 22 |
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| correctly. | ||
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| Needle and rotary hook tip are | Adjust the driver needle guard. | P. 59 |
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| touching. | ||
| Skipped stitches occur. |
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| Clearance between needle and rotary | Adjust the needle clearance. | P. 60 | |
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| hook tip is too large. | ||
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| Needle and rotary hook timing is | Adjust the timing. | P. 59 |
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| incorrect. | ||
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| Replace the needle hole plate with one |
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| with a smaller needle diameter. |
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| Use a thinner feed plate. |
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| Material is flapping. | * Recommended thickness: 1.5 mm |
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| Process the work clamps and the feed |
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| plate into shapes that can hold the | P. 69 |
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| material near the seam. |
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| Adjust the intermittent height of the | P. 38 |
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| intermittent work clamp. | |
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| (Continued on next page) | |
78 |