1. Bottom too == adjust the pressure plate and thread tension shuttle tension evenly
2. Pin-sharp edge cut== replacement needle.
3. The thickness of the needle and embroidery thread not == according to the embroidery thread select the thickness of the thickness of the needle types.
4. Rotating hook tip creepy == polishing rotating hook tip or change the hook.
5. Line == Silicon oil lubrication.
6. Shuttle creepy line delay == sanding or polishing the willies.
7. Take-up lever Kong Famao == sand leather.
8. Eyeliner Gou Kong eerily == sand leather.
9. Kong Famao == needle plate with sand leather pull.
10. Clip, cord grip screws creepy == sand leather.
11. Positioning Gou Famao == sand leather.
12. Positioning hooks and shuttles unreasonable == gap clearance adjust the clearance.
13. Wire tightener clamp wire failure == clear rubbish from the tightener.
14. Groove direction == adjust needle slot Captain slot on the operator.