Check for the following matters.

• Probable cause

  The threading on the machine is improper.

   

  Remedy

  Make sure that the threads are passed into the machine properly.
  Rethread the threads to the machine in an appropriate procedure.

   

  Refer to the detailed instructions to learn the threading procedure.

  Instructions for threading the machine.

  You can also see the instructions for threading on movie.

  Video instructions for threading

• Probable cause

  Adjustment of thread tension is not performed properly.

   

  Remedy

  Position "4" on the tension dial is the standard of thread tension.
  Start the adjustment with "4" when adjusting thread tension.
  When adjusting the thread tension, change the tension dial position little by little and then check the sewing result with trial sewing.

   

  Refer to the instructions to learn the adjustment of thread tension.

  Instructions for adjustment of thread tension

• Probable cause

  The presser foot is not lowered.

   

  Remedy

  If the pressor foot is not lowered, the feed dogs cannot feed the fabric to forward.
  Lower the pressor foot.

• Probable cause

  The needle is bent, or the tip of needle is blunt or broken.

   

  Remedy

  Check all needles, and then replace the needle if it damaged.