SunStar Fortuna series, User Manual

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c. When bobbin counter is complete
Replace old lower thread with the new one. Start sewing and the value of bc (Bobbin
counter) will go down gradually.
Take note that the buzzer will go off when the value goes down below 20. This is to
warn that there is little lower thread left.
Continue sewing till the value of bobbin counter hits 0. Then sewing will stop,
buzzer will go off, and the display will start to flash.
When sewing stops after counting is complete, use the following method to return.
Press to change to the automatically stored value of bc.
(AUTO CLEAR/PRESET)
[ Caution ]
※ To use the bobbin counter function, first set B-Group 39 to “1.”
※ Use button to change the display to set/clear the value of bobbin counter during sewing.
※ button is used to set the value of bobbin counter on “bc” display or to return to the default value. Press A button to clear
the current value and recall the stored counter value.
※ Wind the lower thread with consistency to ensure the proper use of bobbin counter functions. Counter functions may work
differently depending on lower thread and sewing conditions.