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Trouble
Needle breakage
Lower thread remaining
amount detection error
Detection of the lower thread
detection with the tread
remained in the bobbin
• Is the needle installed correctly ?
→ Refer to "How to attach the needle".
• Is the needle bend ? Is the needle point crushed ?
→ Replace the needle with new one.
• Is the timing of needle and rotary hook adjusted correctly ?
→ Refer to "Timing adjustment of needle and rotary hook".
• Is the lower thread wound on the right position ?
→ Refer to "How to wind the lower thread".
• Is the sensitivity of sensor amplifier correctly set ?
→ Refer to "Adjustment of lower thread detection sensor".
• Is the lens of fiber unit filthy with dirt ?
→ Wipe out the dirt from the surface of the lens.
• Is the bobbin for lower thread remaining amount detection used ?
→ Use the bobbin for lower thread remaining amount detection.
• Is the bobbin case for lower thread remaining amount detection used ?
→ Use the bobbin case for lower thread remaining amount detection.
• Is the bobbin wound evenly ?
→ Refer to "How to wind the lower thread".
• Is the sensor cable correctly connected ?
→ Confirm connection of the sensor cable and main PCB.
• Is the fiber correctly connected ?
→ Confirm connection of fiber unit and sensor amplifier.
• Is the sensitivity of sensor amplifier correctly set ?
→ Refer to "Adjustment of lower thread detection sensor".
BAS-6150
Check and corrective action
Chapter 10 Troubleshooting
103
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