Check for the following matters.

• Probable cause

  Thread tension too tight.

   

  Remedy

  Decrease thread tension when sewing lightweight or fine material.

   

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

  Adjusting the thread tension dials

  Thread tension adjustment

• Probable cause

  Improper threading or thread tangled.

   

  Remedy

  Thread correctly.

   

  Refer to the instructions to learn threading.

  Threading the loopers

  Threading the needles

• Probable cause

  Differential feed ratio adjustment dial not set to appropriate scale marking.

   

  Remedy

  Set the dial to an appropriate scale marking.

   

  Refer to the instructions to learn the differential feed adjustment.

  Differential feed adjustment