Each time a key is pressed or an incorrect operation is performed, a beep is sounded.

• For a correct operation
  One beep is sounded.
• If an incorrect operation is performed
  Two or four beeps are sounded.
• If the machine locks up, for example, because the thread is tangled
  The sewing machine continues to beep for four seconds.
  The machine automatically stops.
  Be sure to check for the cause of the error, and correct it before continuing to sew.