16. TROUBLESHOOTING
| Cause | Check | Remedy | Page |
Upper | thread | Installation position of | Adjust the installation position of upper thread |
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trimmer assembly | upper thread trimmer | trimmer assembly by moving the setting plate |
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| assembly | assembly. |
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| Upper thread trimmer longitudinal position |
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| adjustment |
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| Upper thread trimmer cutting depth adjustment |
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| Service |
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| manual |
| 4005Q |
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Upper thread trimmer | Adjust so that the thread does not come out when |
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assembly holding force | you cut it with scissors and hold the end of the |
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| thread between your fingers and gently swing the |
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| assembly. |
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| Bend the scissors U or replace them so that the |
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| correct force is applied. |
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| Repair any damage from striking the needle. |
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| Cotton yarn #60 | - |
| Holding force approx. 2N |
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| 4006Q |
Opening cam position | Adjust the position so that the scissors do not touch |
| the opening cam when the work clamp is lowered. |
76
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| 0.5 mm | 4107M |
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Tension | release End of tension release at | Use parameter number 63 to retard the tension | 44 | |||
timing | the beginning of sewing |
| release timing. |
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| Opening | amount | of | Adjust the zigzag tension discs by moving the |
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| 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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| to 0.5 - 1.0 mm by removing the top cover and |
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| moving the tension release cam. |
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Zigzag tension | Tack tension |
0.5 - 1 mm
4008Q
99 |