Check for the following matters.

• Probable cause

  Adjustment of thread tension is not performed properly.

   

  Remedy

  Adjust the thread tension properly.
  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 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

  Thread is tangled.

   

  Remedy

  Check the spool pin, thread holders, etc., and remove the tangled thread.
  Remove the tangled thread from the machine.

• Probable cause

  Differential feed adjustment is improper.

   

  Remedy

  Perform the differential feed adjustment with the differential feed adjustment dial properly.

   

  

  (1) Differential feed adjustment dial

   

  For more information, refer to the instructions "Differential feed adjustment".

  Instructions for adjusting the differential feed.

  You can also see the instructions on movie.

  Video instructions: "How to adjust the differential feed".