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

  Adjustment of the looper thread tension is improper.

   

  Remedy

  Check the position of the looper thread tension adjustment lever.
  The spring operated by the lever absorbs slack of the thread.
  Fine adjustments can be made to the looper thread tension with the looper thread tension adjustment lever.

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

  Instructions for adjustment of the looper thread tension

   

  

  (1) Looper thread tension adjustment lever
  (2) Spring

• 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.

• Probable cause

  Needle is installed incorrectly.

   

  Remedy

  Reinstall needles correctly.
  Make sure that the needle is installed until it touches the needle stopper.

  

• Probable cause

  Wrong needle is used.

   

  Remedy

  Use a standard home sewing machine needle. The recommended needle is 130/705H (#90).

• Probable cause

  Presser foot pressure is too loose.

   

  Remedy

  Turn the pressure adjustment screw clockwise to increase the presser foot pressure.

  Refer to the instructions for adjusting the presser foot pressure.

  Instructions for adjusting the presser foot pressure.