Check for the following matters.

• 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

   

  For fine tune of the thread tension, refer to the comparison chart below.

  The different type of the cover stitches and a general guideline for thread tension settings

  The different type of the top cover stitches and a general guideline for thread tension settings