14. TROUBLESHOOTING
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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. |
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| being pulled? | Instruction | ||
| Spinning of bobbin during |
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| Set the bobbin so that it turns in the opposite direction to the | manual | ||
| thread trimming |
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| rotary hook. |
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| • Is there too much thread |
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| wound onto the bobbin? | Instruction | ||
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| The bobbin winding amount | |||
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| should not be more than | manual | ||
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| 80 %. |
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| Instruction |
| Lower |
| • Is the | ||||
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| Attach the | manual | |||
| thread |
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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 than the | Instruction | ||
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| being used? (8560A) | |||
| 0628M |
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| Use only bobbins which are specified by Brother. | manual | ||
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| 3557M |
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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. |
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| Replace the needle if it is bent or broken. | Instruction | ||
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| • Is the needle properly installed? | ||||
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| If it is incorrect, install the needle correctly. | manual | ||
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| • Is the machine properly threaded? | Instruction | |||
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| If it is incorrect, thread the thread correctly. | manual | ||
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| • Is the rotary hook sufficiently lubricated? | Instruction | |||
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| If the oil gauge is down to the lower reference line in the oil | |||
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| gauge window, add more oil. | manual | ||
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| • Is the upper or lower thread tension too weak or too strong? | Instruction | |||
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| Adjust the upper thread or lower thread tension. | manual | ||
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| • | Is the upper thread may be loose because the thread |
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| spring operating range is too small? | 69 | ||
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| Adjust the position of the thread | |||
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| • Is the needle and rotary hook timing incorrect? | 73 | |||
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| Adjust the height of the needle bar. | |||
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| Adjust the clearance between the needle and the rotary hook. | 76 - 77 | ||
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| • Is the thread too thick for the needle? |
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| Use the correct needle or the correct thread. |
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| • Is the rotary hook, bobbin case, thread |
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| part in the thread path damaged? |
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| 0471M |
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| Repair the damage, or replace the part with a new one. |
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11 | Broken needles |
| • | Is the material being pushed or pulled with excessive force during |
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| sewing? | Instruction | ||
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| • Is the needle properly installed? | ||||
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| If it is incorrect, install the needle correctly. | manual | ||
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| • | Is the needle bent, is the needle tip broken, or is the needle hole |
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| blocked? |
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| Replace the needle. |
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| • Is the needle and rotary hook timing incorrect? | 73 | |||
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| Adjust the height of the needle bar. | |||
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| Adjust the clearance between the needle and the rotary hook. | 76 - 77 | ||
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| Caution |
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| extremely dangerous to leave any pieces of broken |
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| • It is |
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| needle sticking in the material. If the needle breaks, |
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| search for all pieces until the whole of the needle is |
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| found again. |
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| • Furthermore, we recommend that through steps be |
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| taken to account for such needles to comply with |
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| 0469M |
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| product liability regulations. |
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112 |