7. TROUBLESHOOTING
7. TROUBLESHOOTING
CAUTION
Turn off the power switch before carrying out troubleshooting, otherwise the machine will operate if the treadle is pressed by mistake, which could result in injury.
*When using a clutch motor, the motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work.
Trouble |
| What to check or do | Reference |
| page | ||
|
|
| |
|
|
| |
1. Needle breaks. | 1. Use a needle and thread to match the material. | — | |
| 2. | Check for proper needle installation. | 14 |
| 3. | Check the installation positions of the needle, under looper and | 25 · 26 · 28 |
|
| over looper. |
|
|
|
| |
2. Stitches skip. | 1. Check the installation positions of the needle, under looper and | 25 · 26 · 28 | |
|
| over looper. |
|
| 2. | Damaged or blunt looper tip: correct with sandpaper or install | — |
|
| a new looper. |
|
| 3. | Check the thread tension. | 16 |
| 4. | Check the threading. | 15 |
| 5. | Check for low thread tension in the double chain stitch looper. | 16 |
|
|
| |
3. Wrinkles appear. | 1. Use a needle and thread to match the material. | — | |
| 2. | Check for high thread tension. | 16 |
| 3. | Check for high presser foot pressure. | 18 |
| 4. | Check the feed dog height. | 31 |
| 5. | Check the differential feed amount. | 20 |
|
|
| |
4. Seams are not consistent. | 1. Inconsistent thread tension: check and clean the thread path. | — | |
| 2. | Check for low thread tension. | 16 |
| 3. | Blunt needle tip: replace with a new needle. | — |
| 4. | Check for low presser foot pressure. | 18 |
| 5. | Check the feed dog height. | 31 |
|
|
| |
5. Thread breaks. | 1. Check the needle installation. | 14 | |
| 2. | Check the threading. | 15 |
| 3. | Check for high thread tension. | 16 |
| 4. | Check for damage to the looper, needle plate, needle, needle | — |
|
| guard: fix with sandpaper or buffing. |
|
|
|
| |
6. Knives cut poorly. | 1. Check the upper/lower knife overlap. | 30 | |
| 2. | Check the upper/lower knife installation. | 30 |
| 3. | Check for upper/lower knife wear. | 21 |
|
|
| |
7. Double chain stitching is | 1. Check the threading. | 15 | |
not possible. | 2. Check the needle and looper thread tension. | 17 | |
| 3. | Check the main feed dog height. | 31 |
| 4. | Check the presser foot position. | 30 |
| 5. | Check the double chain stitch looper installation. | 29 |
|
|
|
|
33
