Method description:

There are many reasons why the thread tension adjustment is not good.

■ Check that the upper thread is threaded correctly. Rethread the sewing machine according to the correct instructions in the instructions.

■ Check the upper thread tension setting.

■ Remove the bobbin and confirm that the bobbin thread is placed correctly.

■ If the cable head, wire ash, etc. in the bobbin case, please clean it in time with the cleaning brush in the accessory box. Refer to the “Cleaning the ribs” section in the “Maintenance and Maintenance” chapter of the instruction manual.

■ Confirm that the appropriate needles, threads, and fabrics are used. Please confirm the needles and threads that are suitable for the fabric before sewing.