16. TROUBLESHOOTING
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Longitudinal |
| feed | Installation position of the | Move the upper thread trimmer driving link so that it |
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arm |
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| longitudinal feed arm | stops at the face plate. In this position, tighten the |
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| bolts so that the small slot in the upper thread |
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| trimmer lever and the edge of the washer are |
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| aligned. |
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| Aligned | - |
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| Upper thread |
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| trimmer lever |
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| Washer |
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| 4011Q |
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Needle bar height in | Upper | shaft | pulley | Adjust the needle up sensor position. |
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machine | stopped | stopping position |
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condition |
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Cam |
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| Upper | thread | scissors | Adjust so that the cam opens the stop plate | 76 |
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| opening timing |
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Opening cam |
| Upper | thread | scissors | Adjust the timing so that the upper thread scissors |
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| gradual opening timing | gradually start opening when the feed mechanism | 76 | ||
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| moves about 1.5 - 2.5 mm. |
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| Upper | thread | scissors | Apply grease to the inclined face of the opening | 76 |
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| operation |
| cam. | ||
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Work clamp | home | Work | clamp | home | After setting the sewing machine to the home |
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position sensor | position sensor position | position, press the RESET key and then adjust the |
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| distance between the upper thread trimmer and the |
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| center of the needle when the work clamp is |
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| lowered to 5.5 - 6.0 mm. |
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| 5.5 – 6.0 mm |
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| 4012Q |
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Upper |
| thread | Upper | thread | trimmer | Adjust so that the upper thread trimmer lever opens |
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trimmer lever |
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| lever operating force | gently when the stop plate is separated from the |
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| stopper. |
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| 4013Q |
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Cause |
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| Check |
| Remedy | Page | |
Needle |
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| Needle installation | As viewed from the direction of the face plate, insert | 57 | ||
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| needle fully into needle bar so that the notched part | |
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| of needle faces frontward. |
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Rotary hook |
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| Needle | bar height and | Adjust the needle and hook timing. |
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| needle bar lift amount | 1. Adjust the needle bar height to “1” on the gauge. | 72, 73 | ||
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| 2. Adjust the needle bar lift amount to “2” on the | |
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| gauge. |
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| Gap between needle and | Adjust the gap between needle and rotary hook to |
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| rotary hook |
| 0.01 - 0.08 mm. (Adjust to as large as possible | 73 | |
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| without causing skipped stitches to occur.) | |
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| * Check that rotary hook point does not strike |
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| needle in zigzag motion. |
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103 |