16. TROUBLESHOOTING
Cause | Check | Remedy | Page |
Feed home position | Feed home position | Adjust the feed home position sensor position. | - |
sensor | sensor position |
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Feed timing belt | Feed timing belt tension | Adjust the feed timing belt. | - |
Cause |
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| Remedy | Page |
Zigzag | home | Zigzag home | position | Adjust the zigzag home position sensor position. | - |
position sensor |
| sensor position |
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Stopper |
| Stopper position |
| Adjust the stopper position. | - |
Cause | Check | Remedy | Page | |
Thread | breakage | Thread breakage detector | Adjust the thread breakage detector position. |
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detector |
| position | * If the detector is not adjusted, sewing may stop | - |
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| even when the thread is not broken. |
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Pauses |
| Panel DIP switch A - No. | When panel DIP switch A - No. 3 is set to ON, |
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| 3 | sewing will pause when the treadle is depressed |
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| backward. | 81 |
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| * If the treadle is depressed very firmly and then | |
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| released, the pedal may depress backward and |
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| cause sewing to be paused. |
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Threading |
| Upper thread threading | Pass the thread correctly through the thread guide. | 58 |
Error |
| Upper thread scissors | Apply grease to the inclined face of the opening | 76 |
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| operation | cam. | |
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| Cause |
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| Check | Remedy | Page |
Thread | retainer | and | Thread | trimmer | Turn the machine pulley backward to set the |
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rotary | hook | are | mechanism position | needle bar to the needle up position. |
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touching. |
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| Push the thread driving arm in the direction of the |
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| arrow to set the thread trimming mechanism to |
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| the home position. |
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| Thread driving arm |
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| 4109M |
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109 |