14. TROUBLESHOOTING
•Please check the following points before calling for repairs or service.
•If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase.
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury.
CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
| Problem |
| Possible cause |
| Page |
1 | Upper thread is not tight. | • | Is the upper thread tension too weak, or is the lower thread tension | Instruction | |
|
|
| too strong? |
| |
|
|
| Adjust the upper thread tension or lower thread tension. |
| manual |
|
| • | Was the thread threaded through the thread guide of the bobbin |
| |
|
|
| case in accordance with the type and thickness of the sewing |
| |
|
|
| article’s material. |
|
|
|
|
| Use thread guide A or B in |
| Instruction |
|
|
| accordance with the material being |
| |
|
|
| sewn. |
| manual |
| 0573M |
|
| 3556M |
|
|
|
|
|
| |
2 | Lower thread is not tight. | • | Is the lower thread tension too weak, or is the upper thread tension | Instruction | |
|
|
| too strong? |
| |
|
|
| Adjust the lower thread tension or upper thread tension. |
| manual |
|
| • | Was the thread threaded through the thread guide of the bobbin |
| |
|
|
| case in accordance with the type and thickness of the sewing |
| |
|
|
| article’s material. |
|
|
|
|
| Use thread guide A or B in |
| Instruction |
|
|
| accordance with the material being |
| |
|
|
| sewn. |
| manual |
| 0574M |
|
| 3556M |
|
|
|
|
|
|
|
109 |