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| 8. TROUBLESHOOTING | ||
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| Problem |
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| Possible cause |
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| 8 | Material slippage | ・ Is the presser foot pressure too strong? |
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| Adjust the presser foot pressure. |
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| 0750M |
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| 9 | Lower thread is tangled at | ・ Is the bobbin spinning direction correct when the lower thread is |
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| the sewing start. | being pulled? |
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| Spinning of bobbin during | Set the bobbin so that it turns in the opposite direction to the |
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| thread trimming | rotary hook. |
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| Lower | ・ Is there | too | much | thread |
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| wound onto the bobbin? |
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| thread |
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| The | bobbin | winding |
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| amount | should | not be |
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| more than 80 %. |
| 2124M |
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| ・ Is the |
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| Attach the |
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| ・ Is the bobbin turning smoothly? |
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| If the bobbin is not turning smoothly, replace the bobbin. |
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| ・ Is a bobbin other that the |
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| being used? |
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| Use only bobbins which are specified by Brother. |
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| 0751M |
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| 10 | Upper and lower threads | ・ Is the needle bent or is the needle tip broken? |
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| are breaking. | Replace the needle if it is bent or broken. |
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| ・ Is the needle properly installed? |
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| If it is incorrect, install the needle correctly. |
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| ・ Is the machine properly threaded? |
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| If it is incorrect, thread the thread correctly. |
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| ・ Is the upper or lower thread tension too weak or too strong? |
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| Adjust the upper thread or lower thread tension. |
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| ・ Is the upper thread may be loose because the thread |
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| operating range is too small? |
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| Adjust the position of the thread |
| 26* |
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| ・ Is the rotary hook, feed dog or other part damaged? |
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| If they are damaged, smooth them with an oiled grindstone or |
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| replace the damaged parts. |
| * |
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| ・ Is the thread path damaged? |
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| If the thread path is damaged, smooth it with sandpaper or |
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| replace the damaged part. |
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| 0471M |
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| 11 | Incorrect thread trimming | ・ Is the fixed knife or movable knife damaged or worn? |
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| (Upper and lower threads | Replace the fixed knife or the movable knife. |
| 27* |
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| are both not being |
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| trimmed) |
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| 12 | Incorrect thread trimming | ・ Is the needle properly installed? |
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| (Upper thread or lower | If it is incorrect, install the needle correctly. |
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| thread is not being | ・ Is the fixed knife or movable knife blunt? |
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| trimmed) | Replace the fixed knife or the movable knife. |
| 27* |
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36 |