16. TROUBLESHOOTING
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Upper thread trimmer | Installation | position | of | Adjust the installation position of upper thread |
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assembly |
| upper | thread | trimmer | trimmer assembly by moving the setting plate |
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| Upper thread trimmer longitudinal position adjust- |
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| Upper thread trimmer cutting depth adjustment |
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| Service |
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| 4005Q |
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| Burr on tips of upper | Polish with buff or replace the part. |
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| thread | trimmer | M | and |
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| upper thread trimmer U. |
| Check burr on upper |
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| side here |
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| Check burr here | - |
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| 4009Q |
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Tension | release | Opening |
| amount | of | Adjust the zigzag tension discs by moving the |
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timing |
| zigzag tension discs and | tension stud bracket in and out. |
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| bar tack | tension discs | Adjust the bar tack tension discs opening amount |
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| (particularly | zigzag | to 0.5 - 1.0 mm by removing the top cover and |
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| tension discs) |
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| moving the tension release cam. |
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| Zigzag tension | Tack tension |
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| 0.5 - 1 mm |
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| 4008Q |
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Work clamp |
| Work clamp lifting speed | Use memory switch No. 02 to retard the work clamp | 79 | |||||
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| lifting speed. |
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101 |