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| 16. TROUBLESHOOTING | |||
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| Cause |
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| Check |
| Remedy | Page |
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| Upper | thread | Installation height | Adjust the upper thread scissors installation height. | 75 |
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| scissors |
| 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 | Adjust so that the cam opens the stop plate | 76 |
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| opening timing |
| properly. |
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| Upper | thread | trimmer | Polish blade of upper thread trimmer M and upper |
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| assembly movement | thread guide with buffer. | - |
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| Check for burrs on the top surface of upper thread |
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| trimmer M. |
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| Replace the parts. |
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| Lateral | position | of upper | Adjust the lateral position of the upper thread |
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| thread scissors |
| scissors. |
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| Approx. 1 mm | - |
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| 4020Q |
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| Stitch quality |
| Upper thread tension | Decrease tension to such a degree that it does not | 62 |
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| influence stitch quality. |
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| Zigzag width in the zigzag | Use parameter number 05 to increase the zigzag | 36 |
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| stitch portion |
| width to such a degree that it does not influence the |
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| seam shape. |
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| Work clamp |
| Uneven material feeding | Increase work clamp pressure. (Press material so |
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| that the material is properly stretched.) |
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| When using knits or woven materials, replace the | 74 |
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| parts with the |
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| Length feed plate (for specification |
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| clamp assembly (for knits), needle plate 1.2 (for |
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| specification |
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| Underlay |
| Underlay is being sewn. | Use parameter number 52 to reduce the underlay |
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| sewing start pitch to about 0.5. |
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| Use parameter number 48 to reduce the underlay | 42, 43 |
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| sewing speed. |
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| * If sewing knitted wear, the upper thread may get |
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| caught easily, so you may need to process the |
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| end of the thread. |
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| Bar tack |
| Straight | bar tacking is | When carrying out straight bar tacking, the upper | - |
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| being carried out |
| thread may get caught easily, so you may need to |
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| process the end of the thread. |
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Cause |
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| Check | Remedy | Page | |
Work clamp | lifting | Check | the | work clamp | Change the settings of memory switch Nos. 04, 05, | 79 |
height setting |
| lifting height setting. | 06. | |||
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Presser lifter | pulse | Cord connection | Check the cord connections and contacts. | - | ||
motor |
| Presser lifter pulse motor | Check if the drive gear screw is loose. | - | ||
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| driving gear |
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Treadle |
| Does the work clamp rise | If it rises, use memory switch No. 08 to adjust the | 79 | ||
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| when | the | treadle is | threshold value for lowering the work clamp to a | |
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| depressed backward? | positive value. |
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